mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2024-12-26 05:18:21 +01:00
Merge pull request #26 from michaelrsweet/crypto
Merge RC4/AES-128 crypto implementation.
This commit is contained in:
Michael R Sweet
GitHub
commit
1d1ff88ebc
3
.gitignore
vendored
3
.gitignore
vendored
@ -8,6 +8,5 @@
|
||||
/packages
|
||||
/pdfio.xcodeproj/xcshareddata
|
||||
/testpdfio
|
||||
/testpdfio-out.pdf
|
||||
/testpdfio-out2.pdf
|
||||
/testpdfio-*.pdf
|
||||
/x64
|
||||
|
||||
17
FAQ.md
17
FAQ.md
@ -1,17 +0,0 @@
|
||||
Frequently Asked Questions
|
||||
==========================
|
||||
|
||||
Why Don't You Support Writing a PDF File with Encryption?
|
||||
---------------------------------------------------------
|
||||
|
||||
PDF encryption offers very little protection:
|
||||
|
||||
- PDF encryption keys are reused and derived from the user password (padded
|
||||
with a standard base string) and the object numbers in the file.
|
||||
- RC4 encryption (40- and 128-bit) was broken years ago.
|
||||
- AES encryption (128- and 256-bit) is better, but PDF uses Cipher Block
|
||||
Chaining (CBC) which enables attacks that allow the original encryption key
|
||||
to be recovered.
|
||||
|
||||
In addition, PDF usage controls (no print, no copy, etc.) are tied to this
|
||||
encryption, making them trivial to bypass.
|
||||
20
Makefile
20
Makefile
@ -16,7 +16,8 @@ ARFLAGS = cr
|
||||
CC = cc
|
||||
CFLAGS =
|
||||
CODESIGN_IDENTITY = Developer ID
|
||||
COMMONFLAGS = -Os -g
|
||||
#COMMONFLAGS = -Os -g
|
||||
COMMONFLAGS = -O0 -g
|
||||
CPPFLAGS = '-DPDFIO_VERSION="$(VERSION)"'
|
||||
DESTDIR = $(DSTROOT)
|
||||
DSO = cc
|
||||
@ -40,13 +41,18 @@ PUBHEADERS = \
|
||||
pdfio.h \
|
||||
pdfio-content.h
|
||||
PUBOBJS = \
|
||||
pdfio-aes.o \
|
||||
pdfio-array.o \
|
||||
pdfio-common.o \
|
||||
pdfio-content.o \
|
||||
pdfio-crypto.o \
|
||||
pdfio-dict.o \
|
||||
pdfio-file.o \
|
||||
pdfio-md5.o \
|
||||
pdfio-object.o \
|
||||
pdfio-page.o \
|
||||
pdfio-rc4.o \
|
||||
pdfio-sha256.o \
|
||||
pdfio-stream.o \
|
||||
pdfio-string.o \
|
||||
pdfio-token.o \
|
||||
@ -144,16 +150,8 @@ pdfio1.def: $(LIBOBJS) Makefile
|
||||
echo "LIBRARY pdfio1" >$@
|
||||
echo "VERSION 1.0" >>$@
|
||||
echo "EXPORTS" >>$@
|
||||
(nm $(LIBOBJS) 2>/dev/null | grep "T _" | awk '{print $$3}' | \
|
||||
grep -v '^_ttf' | grep -v '^__' | sed -e '1,$$s/^_//'; \
|
||||
echo pdfioAdobeRGBGamma; echo pdfioAdobeRGBMatrix; \
|
||||
echo pdfioAdobeRGBWhitePoint; \
|
||||
echo pdfioDisplayP3Gamma; echo pdfioDisplayP3Matrix; \
|
||||
echo pdfioDisplayP3WhitePoint; \
|
||||
echo pdfioSRGBGamma; echo pdfioSRGBMatrix; \
|
||||
echo pdfioSRGBWhitePoint; \
|
||||
echo _pdfioTokenInit; \
|
||||
echo _pdfioValueDebug; echo _pdfioValueRead) | sort >>$@
|
||||
nm $(LIBOBJS) 2>/dev/null | grep "T _" | awk '{print $$3}' | \
|
||||
grep -v '^_ttf' | sed -e '1,$$s/^_//' | sort >>$@
|
||||
|
||||
|
||||
# pdfio test program
|
||||
|
||||
@ -13,8 +13,7 @@ goals of PDFio are:
|
||||
|
||||
- Read and write any version of PDF file
|
||||
- Provide access to pages, objects, and streams within a PDF file
|
||||
- Support reading encrypted PDF files
|
||||
- Support writing PDF files with digital signatures
|
||||
- Support reading and writing of encrypted PDF files
|
||||
- Extract or embed useful metadata (author, creator, page information, etc.)
|
||||
- "Filter" PDF files, for example to extract a range of pages or to embed fonts
|
||||
that are missing from a PDF
|
||||
|
||||
@ -4,8 +4,9 @@ Introduction
|
||||
PDFio is a simple C library for reading and writing PDF files. The primary
|
||||
goals of pdfio are:
|
||||
|
||||
- Read any PDF file with or without encryption or linearization
|
||||
- Write PDF files without encryption or linearization
|
||||
- Read and write any version of PDF file
|
||||
- Provide access to pages, objects, and streams within a PDF file
|
||||
- Support reading and writing of encrypted PDF files
|
||||
- Extract or embed useful metadata (author, creator, page information, etc.)
|
||||
- "Filter" PDF files, for example to extract a range of pages or to embed fonts
|
||||
that are missing from a PDF
|
||||
|
||||
520
pdfio-aes.c
Normal file
520
pdfio-aes.c
Normal file
@ -0,0 +1,520 @@
|
||||
//
|
||||
// AES functions for PDFio.
|
||||
//
|
||||
// Copyright © 2021 by Michael R Sweet.
|
||||
//
|
||||
// Licensed under Apache License v2.0. See the file "LICENSE" for more
|
||||
// information.
|
||||
//
|
||||
// AES code is adapted from the "tiny-AES-c" project
|
||||
// (<https://github.com/kokke/tiny-AES-c>)
|
||||
//
|
||||
|
||||
//
|
||||
// Include necessary headers...
|
||||
//
|
||||
|
||||
#include "pdfio-private.h"
|
||||
|
||||
|
||||
//
|
||||
// Local types...
|
||||
//
|
||||
|
||||
typedef uint8_t state_t[4][4]; // 4x4 AES state table
|
||||
|
||||
|
||||
//
|
||||
// Local globals...
|
||||
//
|
||||
|
||||
static const uint8_t sbox[256] = // S-box lookup table
|
||||
{
|
||||
//0 1 2 3 4 5 6 7 8 9 A B C D E F
|
||||
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
|
||||
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
|
||||
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
|
||||
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
|
||||
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
|
||||
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
|
||||
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
|
||||
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
|
||||
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
|
||||
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
|
||||
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
|
||||
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
|
||||
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
|
||||
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
|
||||
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
|
||||
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
|
||||
};
|
||||
static const uint8_t rsbox[256] = // Reverse S-box lookup table
|
||||
{
|
||||
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
|
||||
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
|
||||
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
|
||||
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
|
||||
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
|
||||
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
|
||||
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
|
||||
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
|
||||
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
|
||||
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
|
||||
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
|
||||
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
|
||||
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
|
||||
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
|
||||
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
|
||||
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
|
||||
};
|
||||
|
||||
// The round constant word array, Rcon[i], contains the values given by
|
||||
// x to the power (i-1) being powers of x (x is denoted as {02}) in the field GF(2^8)
|
||||
static const uint8_t Rcon[11] = // Round constants
|
||||
{
|
||||
0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
|
||||
};
|
||||
|
||||
|
||||
//
|
||||
// Local functions...
|
||||
//
|
||||
|
||||
static void AddRoundKey(size_t round, state_t *state, const uint8_t *RoundKey);
|
||||
static void SubBytes(state_t *state);
|
||||
static void ShiftRows(state_t *state);
|
||||
static uint8_t xtime(uint8_t x);
|
||||
static void MixColumns(state_t *state);
|
||||
static uint8_t Multiply(uint8_t x, uint8_t y);
|
||||
static void InvMixColumns(state_t *state);
|
||||
static void InvSubBytes(state_t *state);
|
||||
static void InvShiftRows(state_t *state);
|
||||
static void Cipher(state_t *state, const _pdfio_aes_t *ctx);
|
||||
static void InvCipher(state_t *state, const _pdfio_aes_t *ctx);
|
||||
static void XorWithIv(uint8_t *buf, const uint8_t *Iv);
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoAESInit()' - Initialize an AES context.
|
||||
//
|
||||
|
||||
void
|
||||
_pdfioCryptoAESInit(
|
||||
_pdfio_aes_t *ctx, // I - AES context
|
||||
const uint8_t *key, // I - Key
|
||||
size_t keylen, // I - Length of key (must be 16 or 32)
|
||||
const uint8_t *iv) // I - 16-byte initialization vector
|
||||
{
|
||||
size_t i; // Looping var
|
||||
uint8_t *rkptr0, // Previous round_key values
|
||||
*rkptr, // Current round_key values
|
||||
*rkend, // End of round_key values
|
||||
tempa[4]; // Used for the column/row operations
|
||||
// size_t roundlen = keylen + 24; // Length of round_key
|
||||
size_t nwords = keylen / 4; // Number of 32-bit words in key
|
||||
|
||||
|
||||
// Clear context
|
||||
memset(ctx, 0, sizeof(_pdfio_aes_t));
|
||||
ctx->round_size = keylen / 4 + 6;
|
||||
|
||||
// The first round key is the key itself.
|
||||
memcpy(ctx->round_key, key, keylen);
|
||||
|
||||
// All other round keys are found from the previous round keys.
|
||||
for (rkptr0 = ctx->round_key, rkptr = rkptr0 + keylen, rkend = rkptr + 16 * ctx->round_size, i = nwords; rkptr < rkend; i ++)
|
||||
{
|
||||
if ((i % nwords) == 0)
|
||||
{
|
||||
// Shifts word left once - [a0,a1,a2,a3] becomes [a1,a2,a3,a0], then
|
||||
// apply the S-box to each of the four bytes to produce an output word.
|
||||
tempa[0] = sbox[rkptr[-3]] ^ Rcon[i / nwords];
|
||||
tempa[1] = sbox[rkptr[-2]];
|
||||
tempa[2] = sbox[rkptr[-1]];
|
||||
tempa[3] = sbox[rkptr[-4]];
|
||||
}
|
||||
else if (keylen == 32 && (i % nwords) == 4)
|
||||
{
|
||||
// Apply the S-box to each of the four bytes to produce an output word.
|
||||
tempa[0] = sbox[rkptr[-4]];
|
||||
tempa[1] = sbox[rkptr[-3]];
|
||||
tempa[2] = sbox[rkptr[-2]];
|
||||
tempa[3] = sbox[rkptr[-1]];
|
||||
}
|
||||
else
|
||||
{
|
||||
// Use unshifted values without S-box...
|
||||
tempa[0] = rkptr[-4];
|
||||
tempa[1] = rkptr[-3];
|
||||
tempa[2] = rkptr[-2];
|
||||
tempa[3] = rkptr[-1];
|
||||
}
|
||||
|
||||
// TODO: Optimize to incorporate this into previous steps
|
||||
*rkptr++ = *rkptr0++ ^ tempa[0];
|
||||
*rkptr++ = *rkptr0++ ^ tempa[1];
|
||||
*rkptr++ = *rkptr0++ ^ tempa[2];
|
||||
*rkptr++ = *rkptr0++ ^ tempa[3];
|
||||
}
|
||||
|
||||
// Copy the initialization vector...
|
||||
if (iv)
|
||||
memcpy(ctx->iv, iv, sizeof(ctx->iv));
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoAESDecrypt()' - Decrypt a block of bytes with AES.
|
||||
//
|
||||
// "inbuffer" and "outbuffer" can point to the same memory. Length must be a
|
||||
// multiple of 16 bytes (excess is not decrypted).
|
||||
//
|
||||
|
||||
size_t // O - Number of bytes in output buffer
|
||||
_pdfioCryptoAESDecrypt(
|
||||
_pdfio_aes_t *ctx, // I - AES context
|
||||
uint8_t *outbuffer, // I - Output buffer
|
||||
const uint8_t *inbuffer, // I - Input buffer
|
||||
size_t len) // I - Number of bytes to decrypt
|
||||
{
|
||||
uint8_t next_iv[16]; // Next IV value
|
||||
size_t outbytes = 0; // Output bytes
|
||||
|
||||
|
||||
if (inbuffer != outbuffer)
|
||||
{
|
||||
// Not the most efficient, but we can optimize later - the sample AES code
|
||||
// manipulates the data directly in memory and doesn't support separate
|
||||
// input and output buffers...
|
||||
memcpy(outbuffer, inbuffer, len);
|
||||
}
|
||||
|
||||
while (len > 15)
|
||||
{
|
||||
memcpy(next_iv, outbuffer, 16);
|
||||
InvCipher((state_t *)outbuffer, ctx);
|
||||
XorWithIv(outbuffer, ctx->iv);
|
||||
memcpy(ctx->iv, next_iv, 16);
|
||||
outbuffer += 16;
|
||||
len -= 16;
|
||||
outbytes += 16;
|
||||
}
|
||||
|
||||
return (outbytes);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoAESEncrypt()' - Encrypt a block of bytes with AES.
|
||||
//
|
||||
// "inbuffer" and "outbuffer" can point to the same memory. "outbuffer" must
|
||||
// be a multiple of 16 bytes.
|
||||
//
|
||||
|
||||
size_t // O - Number of bytes in output buffer
|
||||
_pdfioCryptoAESEncrypt(
|
||||
_pdfio_aes_t *ctx, // I - AES context
|
||||
uint8_t *outbuffer, // I - Output buffer
|
||||
const uint8_t *inbuffer, // I - Input buffer
|
||||
size_t len) // I - Number of bytes to decrypt
|
||||
{
|
||||
uint8_t *iv = ctx->iv; // Current IV for CBC
|
||||
size_t outbytes = 0; // Output bytes
|
||||
|
||||
|
||||
if (inbuffer != outbuffer)
|
||||
{
|
||||
// Not the most efficient, but we can optimize later - the sample AES code
|
||||
// manipulates the data directly in memory and doesn't support separate
|
||||
// input and output buffers...
|
||||
memcpy(outbuffer, inbuffer, len);
|
||||
}
|
||||
|
||||
while (len > 15)
|
||||
{
|
||||
XorWithIv(outbuffer, iv);
|
||||
Cipher((state_t*)outbuffer, ctx);
|
||||
iv = outbuffer;
|
||||
outbuffer += 16;
|
||||
len -= 16;
|
||||
outbytes += 16;
|
||||
}
|
||||
|
||||
if (len > 0)
|
||||
{
|
||||
// Pad the final buffer with (16 - len)...
|
||||
memset(outbuffer + len, 16 - len, 16 - len);
|
||||
|
||||
XorWithIv(outbuffer, iv);
|
||||
Cipher((state_t*)outbuffer, ctx);
|
||||
iv = outbuffer;
|
||||
outbytes += 16;
|
||||
}
|
||||
|
||||
/* store Iv in ctx for next call */
|
||||
memcpy(ctx->iv, iv, 16);
|
||||
|
||||
return (outbytes);
|
||||
}
|
||||
|
||||
|
||||
// This function adds the round key to state.
|
||||
// The round key is added to the state by an XOR function.
|
||||
static void
|
||||
AddRoundKey(size_t round, state_t *state, const uint8_t *RoundKey)
|
||||
{
|
||||
unsigned i; // Looping var
|
||||
uint8_t *sptr = (*state)[0]; // Pointer into state
|
||||
|
||||
|
||||
for (RoundKey += round * 16, i = 16; i > 0; i --, sptr ++, RoundKey ++)
|
||||
*sptr ^= *RoundKey;
|
||||
}
|
||||
|
||||
|
||||
// The SubBytes Function Substitutes the values in the
|
||||
// state matrix with values in an S-box.
|
||||
static void
|
||||
SubBytes(state_t *state)
|
||||
{
|
||||
unsigned i; // Looping var
|
||||
uint8_t *sptr = (*state)[0]; // Pointer into state
|
||||
|
||||
|
||||
for (i = 16; i > 0; i --, sptr ++)
|
||||
*sptr = sbox[*sptr];
|
||||
}
|
||||
|
||||
// The ShiftRows() function shifts the rows in the state to the left.
|
||||
// Each row is shifted with different offset.
|
||||
// Offset = Row number. So the first row is not shifted.
|
||||
static void
|
||||
ShiftRows(state_t *state)
|
||||
{
|
||||
uint8_t *sptr = (*state)[0]; // Pointer into state
|
||||
uint8_t temp; // Temporary value
|
||||
|
||||
|
||||
// Rotate first row 1 columns to left
|
||||
temp = sptr[1];
|
||||
sptr[1] = sptr[5];
|
||||
sptr[5] = sptr[9];
|
||||
sptr[9] = sptr[13];
|
||||
sptr[13] = temp;
|
||||
|
||||
// Rotate second row 2 columns to left
|
||||
temp = sptr[2];
|
||||
sptr[2] = sptr[10];
|
||||
sptr[10] = temp;
|
||||
|
||||
temp = sptr[6];
|
||||
sptr[6] = sptr[14];
|
||||
sptr[14] = temp;
|
||||
|
||||
// Rotate third row 3 columns to left
|
||||
temp = sptr[3];
|
||||
sptr[3] = sptr[15];
|
||||
sptr[15] = sptr[11];
|
||||
sptr[11] = sptr[7];
|
||||
sptr[7] = temp;
|
||||
}
|
||||
|
||||
|
||||
static uint8_t
|
||||
xtime(uint8_t x)
|
||||
{
|
||||
return ((uint8_t)((x << 1) ^ ((x >> 7) * 0x1b)));
|
||||
}
|
||||
|
||||
|
||||
// MixColumns function mixes the columns of the state matrix
|
||||
static void
|
||||
MixColumns(state_t *state)
|
||||
{
|
||||
unsigned i; // Looping var
|
||||
uint8_t *sptr = (*state)[0]; // Pointer into state
|
||||
uint8_t Tmp, Tm, t; // Temporary values
|
||||
|
||||
for (i = 4; i > 0; i --, sptr += 4)
|
||||
{
|
||||
t = sptr[0];
|
||||
Tmp = sptr[0] ^ sptr[1] ^ sptr[2] ^ sptr[3];
|
||||
Tm = sptr[0] ^ sptr[1];
|
||||
Tm = xtime(Tm);
|
||||
sptr[0] ^= Tm ^ Tmp;
|
||||
|
||||
Tm = sptr[1] ^ sptr[2];
|
||||
Tm = xtime(Tm);
|
||||
sptr[1] ^= Tm ^ Tmp;
|
||||
|
||||
Tm = sptr[2] ^ sptr[3];
|
||||
Tm = xtime(Tm);
|
||||
sptr[2] ^= Tm ^ Tmp;
|
||||
|
||||
Tm = sptr[3] ^ t;
|
||||
Tm = xtime(Tm);
|
||||
sptr[3] ^= Tm ^ Tmp;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// Multiply is used to multiply numbers in the field GF(2^8)
|
||||
// Note: The last call to xtime() is unneeded, but often ends up generating a smaller binary
|
||||
// The compiler seems to be able to vectorize the operation better this way.
|
||||
// See https://github.com/kokke/tiny-AES-c/pull/34
|
||||
static uint8_t Multiply(uint8_t x, uint8_t y)
|
||||
{
|
||||
return (((y & 1) * x) ^
|
||||
((y>>1 & 1) * xtime(x)) ^
|
||||
((y>>2 & 1) * xtime(xtime(x))) ^
|
||||
((y>>3 & 1) * xtime(xtime(xtime(x)))) ^
|
||||
((y>>4 & 1) * xtime(xtime(xtime(xtime(x)))))); /* this last call to xtime() can be omitted */
|
||||
}
|
||||
|
||||
|
||||
// MixColumns function mixes the columns of the state matrix.
|
||||
// The method used to multiply may be difficult to understand for the inexperienced.
|
||||
// Please use the references to gain more information.
|
||||
static void
|
||||
InvMixColumns(state_t *state)
|
||||
{
|
||||
unsigned i; // Looping var
|
||||
uint8_t *sptr = (*state)[0]; // Pointer into state
|
||||
uint8_t a, b, c, d; // Temporary values
|
||||
|
||||
|
||||
for (i = 4; i > 0; i --)
|
||||
{
|
||||
a = sptr[0];
|
||||
b = sptr[1];
|
||||
c = sptr[2];
|
||||
d = sptr[3];
|
||||
|
||||
*sptr++ = Multiply(a, 0x0e) ^ Multiply(b, 0x0b) ^ Multiply(c, 0x0d) ^ Multiply(d, 0x09);
|
||||
*sptr++ = Multiply(a, 0x09) ^ Multiply(b, 0x0e) ^ Multiply(c, 0x0b) ^ Multiply(d, 0x0d);
|
||||
*sptr++ = Multiply(a, 0x0d) ^ Multiply(b, 0x09) ^ Multiply(c, 0x0e) ^ Multiply(d, 0x0b);
|
||||
*sptr++ = Multiply(a, 0x0b) ^ Multiply(b, 0x0d) ^ Multiply(c, 0x09) ^ Multiply(d, 0x0e);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// The SubBytes Function Substitutes the values in the
|
||||
// state matrix with values in an S-box.
|
||||
static void
|
||||
InvSubBytes(state_t *state)
|
||||
{
|
||||
unsigned i; // Looping var
|
||||
uint8_t *sptr = (*state)[0]; // Pointer into state
|
||||
|
||||
|
||||
for (i = 16; i > 0; i --, sptr ++)
|
||||
*sptr = rsbox[*sptr];
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
InvShiftRows(state_t *state)
|
||||
{
|
||||
uint8_t *sptr = (*state)[0]; // Pointer into state
|
||||
uint8_t temp; // Temporary value
|
||||
|
||||
|
||||
// Rotate first row 1 columns to right
|
||||
temp = sptr[13];
|
||||
sptr[13] = sptr[9];
|
||||
sptr[9] = sptr[5];
|
||||
sptr[5] = sptr[1];
|
||||
sptr[1] = temp;
|
||||
|
||||
// Rotate second row 2 columns to right
|
||||
temp = sptr[2];
|
||||
sptr[2] = sptr[10];
|
||||
sptr[10] = temp;
|
||||
|
||||
temp = sptr[6];
|
||||
sptr[6] = sptr[14];
|
||||
sptr[14] = temp;
|
||||
|
||||
// Rotate third row 3 columns to right
|
||||
temp = sptr[3];
|
||||
sptr[3] = sptr[7];
|
||||
sptr[7] = sptr[11];
|
||||
sptr[11] = sptr[15];
|
||||
sptr[15] = temp;
|
||||
}
|
||||
|
||||
|
||||
// Cipher is the main function that encrypts the PlainText.
|
||||
static void
|
||||
Cipher(state_t *state, const _pdfio_aes_t *ctx)
|
||||
{
|
||||
size_t round = 0;
|
||||
|
||||
// Add the First round key to the state before starting the rounds.
|
||||
AddRoundKey(0, state, ctx->round_key);
|
||||
|
||||
// There will be Nr rounds.
|
||||
// The first Nr-1 rounds are identical.
|
||||
// These Nr rounds are executed in the loop below.
|
||||
// Last one without MixColumns()
|
||||
for (round = 1; round < ctx->round_size; round ++)
|
||||
{
|
||||
SubBytes(state);
|
||||
ShiftRows(state);
|
||||
MixColumns(state);
|
||||
AddRoundKey(round, state, ctx->round_key);
|
||||
}
|
||||
// Add round key to last round
|
||||
SubBytes(state);
|
||||
ShiftRows(state);
|
||||
AddRoundKey(ctx->round_size, state, ctx->round_key);
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
InvCipher(state_t *state, const _pdfio_aes_t *ctx)
|
||||
{
|
||||
size_t round;
|
||||
|
||||
// Add the First round key to the state before starting the rounds.
|
||||
AddRoundKey(ctx->round_size, state, ctx->round_key);
|
||||
|
||||
// There will be Nr rounds.
|
||||
// The first Nr-1 rounds are identical.
|
||||
// These Nr rounds are executed in the loop below.
|
||||
// Last one without InvMixColumn()
|
||||
for (round = ctx->round_size - 1; ; round --)
|
||||
{
|
||||
InvShiftRows(state);
|
||||
InvSubBytes(state);
|
||||
AddRoundKey(round, state, ctx->round_key);
|
||||
|
||||
if (round == 0)
|
||||
break;
|
||||
|
||||
InvMixColumns(state);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
XorWithIv(uint8_t *buf, const uint8_t *Iv)
|
||||
{
|
||||
// 16-byte block...
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
*buf++ ^= *Iv++;
|
||||
}
|
||||
@ -398,7 +398,7 @@ pdfioArrayGetBinary(
|
||||
size_t n, // I - Index
|
||||
size_t *length) // O - Length of string
|
||||
{
|
||||
if (!a || n >= a->num_values || a->values[n].type != PDFIO_VALTYPE_BINARY || !length)
|
||||
if (!a || n >= a->num_values || a->values[n].type != PDFIO_VALTYPE_BINARY)
|
||||
{
|
||||
if (length)
|
||||
*length = 0;
|
||||
@ -407,7 +407,9 @@ pdfioArrayGetBinary(
|
||||
}
|
||||
else
|
||||
{
|
||||
*length = a->values[n].value.binary.datalen;
|
||||
if (length)
|
||||
*length = a->values[n].value.binary.datalen;
|
||||
|
||||
return (a->values[n].value.binary.data);
|
||||
}
|
||||
}
|
||||
@ -567,6 +569,7 @@ _pdfioArrayGetValue(pdfio_array_t *a, // I - Array
|
||||
|
||||
pdfio_array_t * // O - New array
|
||||
_pdfioArrayRead(pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_obj_t *obj, // I - Object, if any
|
||||
_pdfio_token_t *tb) // I - Token buffer/stack
|
||||
{
|
||||
pdfio_array_t *array; // New array
|
||||
@ -591,7 +594,7 @@ _pdfioArrayRead(pdfio_file_t *pdf, // I - PDF file
|
||||
|
||||
// Push the token and decode the value...
|
||||
_pdfioTokenPush(tb, token);
|
||||
if (!_pdfioValueRead(pdf, tb, &value))
|
||||
if (!_pdfioValueRead(pdf, obj, tb, &value))
|
||||
break;
|
||||
|
||||
// PDFIO_DEBUG("_pdfioArrayRead(%p): Appending ", (void *)array);
|
||||
@ -610,7 +613,8 @@ _pdfioArrayRead(pdfio_file_t *pdf, // I - PDF file
|
||||
//
|
||||
|
||||
bool // O - `true` on success, `false` otherwise
|
||||
_pdfioArrayWrite(pdfio_array_t *a) // I - Array
|
||||
_pdfioArrayWrite(pdfio_array_t *a, // I - Array
|
||||
pdfio_obj_t *obj) // I - Object, if any
|
||||
{
|
||||
pdfio_file_t *pdf = a->pdf; // PDF file
|
||||
size_t i; // Looping var
|
||||
@ -624,7 +628,7 @@ _pdfioArrayWrite(pdfio_array_t *a) // I - Array
|
||||
// Write each value...
|
||||
for (i = a->num_values, v = a->values; i > 0; i --, v ++)
|
||||
{
|
||||
if (!_pdfioValueWrite(pdf, v, NULL))
|
||||
if (!_pdfioValueWrite(pdf, obj, v, NULL))
|
||||
return (false);
|
||||
}
|
||||
|
||||
|
||||
980
pdfio-crypto.c
Normal file
980
pdfio-crypto.c
Normal file
@ -0,0 +1,980 @@
|
||||
//
|
||||
// Cryptographic support functions for PDFio.
|
||||
//
|
||||
// Copyright © 2021 by Michael R Sweet.
|
||||
//
|
||||
// Licensed under Apache License v2.0. See the file "LICENSE" for more
|
||||
// information.
|
||||
//
|
||||
|
||||
//
|
||||
// Include necessary headers...
|
||||
//
|
||||
|
||||
#include "pdfio-private.h"
|
||||
#if !_WIN32
|
||||
# include <sys/time.h>
|
||||
#endif // !_WIN32
|
||||
#ifdef __has_include
|
||||
# if __has_include(<sys/random.h>)
|
||||
# define HAVE_GETRANDOM 1
|
||||
# include <sys/random.h>
|
||||
# endif // __has_include(<sys/random.h>)
|
||||
#endif // __has_include
|
||||
|
||||
|
||||
//
|
||||
// PDF files can use one of several methods to encrypt a PDF file. There is
|
||||
// an owner password that controls/unlocks full editing/usage permissions and a
|
||||
// user password that unlocks limited usage of the PDF. Permissions are set
|
||||
// using bits for copy, print, etc. (see the `pdfio_permission_t` enumeration).
|
||||
// Passwords can be up to 32 bytes in length, with a well-known padding string
|
||||
// that is applied if the string is less than 32 bytes or there is no password.
|
||||
//
|
||||
// > Note: PDF encryption has several design weaknesses which limit the
|
||||
// > protection offered. The V2 and V4 security handlers depend on the obsolete
|
||||
// > MD5 and RC4 algorithms for key generation, and Cipher Block Chaining (CBC)
|
||||
// > further weakens AES support. Enforcement of usage permissions depends on
|
||||
// > the consuming software honoring them, so if the password is known or (more
|
||||
// > commonly) the user password is blank, it is possible to bypass usage
|
||||
// > permissions completely.
|
||||
//
|
||||
// PDFio supports the following:
|
||||
//
|
||||
// - The original 40-bit RC4 (V2+R2) encryption for reading only
|
||||
// - 128-bit RC4 (V2+R3) encryption for reading and writing
|
||||
// - 128-bit AES (V4+R4) encryption for reading and writing
|
||||
// - TODO: 256-bit AES (V6+R6) encryption for reading and writing
|
||||
//
|
||||
// Common values:
|
||||
//
|
||||
// - "F" is the file encryption key (40 to 256 bits/5 to 32 bytes)
|
||||
// - "Fid" is the file ID string (stored in PDF file, 32 bytes)
|
||||
// - "O" is the owner key (stored in PDF file, 32 bytes)
|
||||
// - "Opad" is the padded owner password (32 bytes)
|
||||
// - "P" is the permissions integer (stored in PDF file)
|
||||
// - "P4" is the permissions integer as a 32-bit little-endian value
|
||||
// - "U" is the user key (stored in PDF file, 32 bytes)
|
||||
// - "Upad" is the padded user password (32 bytes)
|
||||
//
|
||||
// V2+R2 handler:
|
||||
//
|
||||
// F = md5(Upad+O+P4+Fid)
|
||||
// O = rc4(Upad, md5(Opad))
|
||||
// (unlock with owner password)
|
||||
// Upad = rc4(O, md5(Opad))
|
||||
// U = rc4(md5(Upad+Fid)+0[16], F)
|
||||
//
|
||||
// V2+R3/V4+R4 handler:
|
||||
//
|
||||
// F = md5(md5(Upad+O+P4+Fid))^50
|
||||
// O = rc4(Upad, md5(md5(Opad))^50)^20
|
||||
// (unlock with owner password)
|
||||
// Upad = rc4(O, md5(md5(Opad))^50)^20
|
||||
// U = rc4(md5(Upad+Fid)+0[16], F)^20
|
||||
//
|
||||
// V6+R6 handler:
|
||||
//
|
||||
// TODO: document V6+R6 handler
|
||||
//
|
||||
|
||||
//
|
||||
// Local globals...
|
||||
//
|
||||
|
||||
static uint8_t pdf_passpad[32] = // Padding for passwords
|
||||
{
|
||||
0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41,
|
||||
0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01, 0x08,
|
||||
0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80,
|
||||
0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a
|
||||
};
|
||||
|
||||
|
||||
//
|
||||
// Local functions...
|
||||
//
|
||||
|
||||
static void decrypt_user_key(pdfio_encryption_t encryption, const uint8_t *file_key, uint8_t user_key[32]);
|
||||
static void encrypt_user_key(pdfio_encryption_t encryption, const uint8_t *file_key, uint8_t user_key[32]);
|
||||
static void make_file_key(pdfio_encryption_t encryption, pdfio_permission_t permissions, const unsigned char *file_id, size_t file_idlen, const uint8_t *user_pad, const uint8_t *owner_key, uint8_t file_key[16]);
|
||||
static void make_owner_key(pdfio_encryption_t encryption, const uint8_t *owner_pad, const uint8_t *user_pad, uint8_t owner_key[32]);
|
||||
static void make_user_key(pdfio_encryption_t encryption, const unsigned char *file_id, size_t file_idlen, uint8_t user_key[32]);
|
||||
static void pad_password(const char *password, uint8_t pad[32]);
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoLock()' - Lock a PDF file by generating the encryption object and keys.
|
||||
//
|
||||
|
||||
bool // O - `true` on success, `false` otherwise
|
||||
_pdfioCryptoLock(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_permission_t permissions, // I - Use permissions
|
||||
pdfio_encryption_t encryption, // I - Type of encryption to use
|
||||
const char *owner_password, // I - Owner password, if any
|
||||
const char *user_password) // I - User password, if any
|
||||
{
|
||||
pdfio_dict_t *dict; // Encryption dictionary
|
||||
size_t i, j; // Looping vars
|
||||
_pdfio_md5_t md5; // MD5 context
|
||||
uint8_t digest[16]; // 128-bit MD5 digest
|
||||
_pdfio_rc4_t rc4; // RC4 encryption context
|
||||
size_t len; // Length of password
|
||||
uint8_t owner_pad[32], // Padded owner password
|
||||
user_pad[32], // Padded user password
|
||||
perm_bytes[4], // Permissions bytes
|
||||
*file_id; // File ID bytes
|
||||
size_t file_idlen; // Length of file ID
|
||||
pdfio_dict_t *cf_dict, // CF dictionary
|
||||
*filter_dict; // CryptFilter dictionary
|
||||
|
||||
|
||||
if ((dict = pdfioDictCreate(pdf)) == NULL)
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to create encryption dictionary.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
pdfioDictSetName(dict, "Filter", "Standard");
|
||||
|
||||
switch (encryption)
|
||||
{
|
||||
case PDFIO_ENCRYPTION_RC4_128 :
|
||||
case PDFIO_ENCRYPTION_AES_128 :
|
||||
// Create the 128-bit encryption keys...
|
||||
pad_password(user_password, user_pad);
|
||||
|
||||
if (!owner_password && user_password && *user_password)
|
||||
{
|
||||
// Generate a random owner password...
|
||||
_pdfioCryptoMakeRandom(owner_pad, sizeof(owner_pad));
|
||||
}
|
||||
else
|
||||
{
|
||||
// Use supplied owner password
|
||||
pad_password(owner_password, owner_pad);
|
||||
}
|
||||
|
||||
// Compute the owner key...
|
||||
make_owner_key(encryption, owner_pad, user_pad, pdf->owner_key);
|
||||
pdf->owner_keylen = 32;
|
||||
|
||||
// Generate the encryption key
|
||||
file_id = pdfioArrayGetBinary(pdf->id_array, 0, &file_idlen);
|
||||
|
||||
make_file_key(encryption, permissions, file_id, file_idlen, user_pad, pdf->owner_key, pdf->file_key);
|
||||
pdf->file_keylen = 16;
|
||||
|
||||
// Generate the user key...
|
||||
make_user_key(encryption, file_id, file_idlen, pdf->user_key);
|
||||
encrypt_user_key(encryption, pdf->file_key, pdf->user_key);
|
||||
pdf->user_keylen = 32;
|
||||
|
||||
// Save everything in the dictionary...
|
||||
pdfioDictSetNumber(dict, "Length", 128);
|
||||
pdfioDictSetBinary(dict, "O", pdf->owner_key, sizeof(pdf->owner_key));
|
||||
pdfioDictSetNumber(dict, "P", (int)permissions);
|
||||
pdfioDictSetNumber(dict, "R", encryption == PDFIO_ENCRYPTION_RC4_128 ? 3 : 4);
|
||||
pdfioDictSetNumber(dict, "V", encryption == PDFIO_ENCRYPTION_RC4_128 ? 2 : 4);
|
||||
pdfioDictSetBinary(dict, "U", pdf->user_key, sizeof(pdf->user_key));
|
||||
|
||||
if (encryption == PDFIO_ENCRYPTION_AES_128)
|
||||
{
|
||||
if ((cf_dict = pdfioDictCreate(pdf)) == NULL)
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to create Encryption CF dictionary.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
if ((filter_dict = pdfioDictCreate(pdf)) == NULL)
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to create Encryption CryptFilter dictionary.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
pdfioDictSetName(filter_dict, "Type", "CryptFilter");
|
||||
pdfioDictSetName(filter_dict, "CFM", encryption == PDFIO_ENCRYPTION_RC4_128 ? "V2" : "AESV2");
|
||||
pdfioDictSetDict(cf_dict, "PDFio", filter_dict);
|
||||
pdfioDictSetDict(dict, "CF", cf_dict);
|
||||
pdfioDictSetName(dict, "StmF", "PDFio");
|
||||
pdfioDictSetName(dict, "StrF", "PDFio");
|
||||
pdfioDictSetBoolean(dict, "EncryptMetadata", true);
|
||||
}
|
||||
break;
|
||||
|
||||
case PDFIO_ENCRYPTION_AES_256 :
|
||||
// TODO: Implement AES-256 (/V 6 /R 6)
|
||||
|
||||
default :
|
||||
_pdfioFileError(pdf, "Encryption mode %d not supported for writing.", (int)encryption);
|
||||
return (false);
|
||||
}
|
||||
|
||||
if ((pdf->encrypt_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to create encryption object.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
pdfioObjClose(pdf->encrypt_obj);
|
||||
|
||||
pdf->encryption = encryption;
|
||||
pdf->permissions = permissions;
|
||||
|
||||
return (true);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoMakeRandom()' - Fill a buffer with good random numbers.
|
||||
//
|
||||
|
||||
void
|
||||
_pdfioCryptoMakeRandom(uint8_t *buffer, // I - Buffer
|
||||
size_t bytes) // I - Number of bytes
|
||||
{
|
||||
#ifdef __APPLE__
|
||||
// macOS/iOS provide the arc4random function which is seeded with entropy
|
||||
// from the system...
|
||||
while (bytes > 0)
|
||||
{
|
||||
// Just collect 8 bits from each call to fill the buffer...
|
||||
*buffer++ = (uint8_t)arc4random();
|
||||
bytes --;
|
||||
}
|
||||
|
||||
#else
|
||||
# if _WIN32
|
||||
// Windows provides the CryptGenRandom function...
|
||||
HCRYPTPROV prov; // Cryptographic provider
|
||||
|
||||
if (CryptAcquireContextA(&prov, NULL, NULL, PROV_RSA_FULL, 0))
|
||||
{
|
||||
// Got the default crypto provider, try to get random data...
|
||||
BOOL success = CryptGenRandom(prov, (DWORD)bytes, buffer);
|
||||
|
||||
// Release the crypto provider and return on success...
|
||||
CryptReleaseContext(prov, 0);
|
||||
|
||||
if (success)
|
||||
return;
|
||||
}
|
||||
|
||||
# elif HAVE_GETRANDOM
|
||||
// Linux provides a system call called getrandom that uses system entropy ...
|
||||
ssize_t rbytes; // Bytes read
|
||||
|
||||
while (bytes > 0)
|
||||
{
|
||||
if ((rbytes = getrandom(buffer, bytes, 0)) < 0)
|
||||
{
|
||||
if (errno != EINTR && errno != EAGAIN)
|
||||
break;
|
||||
}
|
||||
bytes -= (size_t)rbytes;
|
||||
buffer += rbytes;
|
||||
}
|
||||
|
||||
if (bytes == 0)
|
||||
return;
|
||||
|
||||
# else
|
||||
// Other UNIX-y systems have /dev/urandom...
|
||||
int fd; // Random number file
|
||||
ssize_t rbytes; // Bytes read
|
||||
|
||||
|
||||
// Fall back on /dev/urandom...
|
||||
if ((fd = open("/dev/urandom", O_RDONLY)) >= 0)
|
||||
{
|
||||
while (bytes > 0)
|
||||
{
|
||||
if ((rbytes = read(fd, buffer, bytes)) < 0)
|
||||
{
|
||||
if (errno != EINTR && errno != EAGAIN)
|
||||
break;
|
||||
}
|
||||
bytes -= (size_t)rbytes;
|
||||
buffer += rbytes;
|
||||
}
|
||||
|
||||
close(fd);
|
||||
|
||||
if (bytes == 0)
|
||||
return;
|
||||
}
|
||||
# endif // _WIN32
|
||||
|
||||
// If we get here then we were unable to get enough random data or the local
|
||||
// system doesn't have enough entropy. Make some up...
|
||||
uint32_t i, // Looping var
|
||||
mt_state[624], // Mersenne twister state
|
||||
mt_index, // Mersenne twister index
|
||||
temp; // Temporary value
|
||||
# if _WIN32
|
||||
struct _timeb curtime; // Current time
|
||||
|
||||
_ftime(&curtime);
|
||||
mt_state[0] = (uint32_t)(curtime.time + curtime.millitm);
|
||||
|
||||
# else
|
||||
struct timeval curtime; // Current time
|
||||
|
||||
gettimeofday(&curtime, NULL);
|
||||
mt_state[0] = (uint32_t)(curtime.tv_sec + curtime.tv_usec);
|
||||
# endif // _WIN32
|
||||
|
||||
// Seed the random number state...
|
||||
mt_index = 0;
|
||||
|
||||
for (i = 1; i < 624; i ++)
|
||||
mt_state[i] = (uint32_t)((1812433253 * (mt_state[i - 1] ^ (mt_state[i - 1] >> 30))) + i);
|
||||
|
||||
// Fill the buffer with random numbers...
|
||||
while (bytes > 0)
|
||||
{
|
||||
if (mt_index == 0)
|
||||
{
|
||||
// Generate a sequence of random numbers...
|
||||
uint32_t i1 = 1, i397 = 397; // Looping vars
|
||||
|
||||
for (i = 0; i < 624; i ++)
|
||||
{
|
||||
temp = (mt_state[i] & 0x80000000) + (mt_state[i1] & 0x7fffffff);
|
||||
mt_state[i] = mt_state[i397] ^ (temp >> 1);
|
||||
|
||||
if (temp & 1)
|
||||
mt_state[i] ^= 2567483615u;
|
||||
|
||||
i1 ++;
|
||||
i397 ++;
|
||||
|
||||
if (i1 == 624)
|
||||
i1 = 0;
|
||||
|
||||
if (i397 == 624)
|
||||
i397 = 0;
|
||||
}
|
||||
}
|
||||
|
||||
// Pull 32-bits of random data...
|
||||
temp = mt_state[mt_index ++];
|
||||
temp ^= temp >> 11;
|
||||
temp ^= (temp << 7) & 2636928640u;
|
||||
temp ^= (temp << 15) & 4022730752u;
|
||||
temp ^= temp >> 18;
|
||||
|
||||
if (mt_index == 624)
|
||||
mt_index = 0;
|
||||
|
||||
// Copy to the buffer...
|
||||
switch (bytes)
|
||||
{
|
||||
case 1 :
|
||||
*buffer++ = (uint8_t)(temp >> 24);
|
||||
bytes --;
|
||||
break;
|
||||
case 2 :
|
||||
*buffer++ = (uint8_t)(temp >> 24);
|
||||
*buffer++ = (uint8_t)(temp >> 16);
|
||||
bytes -= 2;
|
||||
break;
|
||||
case 3 :
|
||||
*buffer++ = (uint8_t)(temp >> 24);
|
||||
*buffer++ = (uint8_t)(temp >> 16);
|
||||
*buffer++ = (uint8_t)(temp >> 8);
|
||||
bytes -= 3;
|
||||
break;
|
||||
default :
|
||||
*buffer++ = (uint8_t)(temp >> 24);
|
||||
*buffer++ = (uint8_t)(temp >> 16);
|
||||
*buffer++ = (uint8_t)(temp >> 8);
|
||||
*buffer++ = (uint8_t)temp;
|
||||
bytes -= 4;
|
||||
break;
|
||||
}
|
||||
}
|
||||
#endif // __APPLE__
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoMakeReader()' - Setup a cryptographic context and callback for reading.
|
||||
//
|
||||
|
||||
_pdfio_crypto_cb_t // O - Decryption callback or `NULL` for none
|
||||
_pdfioCryptoMakeReader(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_obj_t *obj, // I - PDF object
|
||||
_pdfio_crypto_ctx_t *ctx, // I - Pointer to crypto context
|
||||
uint8_t *iv, // I - Buffer for initialization vector
|
||||
size_t *ivlen) // IO - Size of initialization vector
|
||||
{
|
||||
uint8_t data[21]; /* Key data */
|
||||
_pdfio_md5_t md5; /* MD5 state */
|
||||
uint8_t digest[16]; /* MD5 digest value */
|
||||
|
||||
|
||||
// Range check input...
|
||||
if (!pdf)
|
||||
{
|
||||
*ivlen = 0;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
switch (pdf->encryption)
|
||||
{
|
||||
default :
|
||||
*ivlen = 0;
|
||||
return (NULL);
|
||||
|
||||
case PDFIO_ENCRYPTION_RC4_128 :
|
||||
case PDFIO_ENCRYPTION_AES_128 :
|
||||
// Copy the key data for the MD5 hash.
|
||||
memcpy(data, pdf->file_key, sizeof(pdf->file_key));
|
||||
data[16] = (uint8_t)obj->number;
|
||||
data[17] = (uint8_t)(obj->number >> 8);
|
||||
data[18] = (uint8_t)(obj->number >> 16);
|
||||
data[19] = (uint8_t)obj->generation;
|
||||
data[20] = (uint8_t)(obj->generation >> 8);
|
||||
|
||||
// Hash it...
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, data, sizeof(data));
|
||||
if (pdf->encryption == PDFIO_ENCRYPTION_AES_128)
|
||||
_pdfioCryptoMD5Append(&md5, (const uint8_t *)"sAlT", 4);
|
||||
_pdfioCryptoMD5Finish(&md5, digest);
|
||||
|
||||
// Initialize the RC4/AES context using the digest...
|
||||
if (pdf->encryption == PDFIO_ENCRYPTION_RC4_128)
|
||||
{
|
||||
*ivlen = 0;
|
||||
_pdfioCryptoRC4Init(&ctx->rc4, digest, sizeof(digest));
|
||||
return ((_pdfio_crypto_cb_t)_pdfioCryptoRC4Crypt);
|
||||
}
|
||||
else
|
||||
{
|
||||
*ivlen = 16;
|
||||
_pdfioCryptoAESInit(&ctx->aes, digest, sizeof(digest), iv);
|
||||
return ((_pdfio_crypto_cb_t)_pdfioCryptoAESDecrypt);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoMakeWriter()' - Setup a cryptographic context and callback for writing.
|
||||
//
|
||||
|
||||
_pdfio_crypto_cb_t // O - Encryption callback or `NULL` for none
|
||||
_pdfioCryptoMakeWriter(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_obj_t *obj, // I - PDF object
|
||||
_pdfio_crypto_ctx_t *ctx, // I - Pointer to crypto context
|
||||
uint8_t *iv, // I - Buffer for initialization vector
|
||||
size_t *ivlen) // IO - Size of initialization vector
|
||||
{
|
||||
uint8_t data[21]; /* Key data */
|
||||
_pdfio_md5_t md5; /* MD5 state */
|
||||
uint8_t digest[16]; /* MD5 digest value */
|
||||
|
||||
|
||||
// Range check input...
|
||||
if (!pdf)
|
||||
{
|
||||
*ivlen = 0;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
switch (pdf->encryption)
|
||||
{
|
||||
default :
|
||||
*ivlen = 0;
|
||||
return (NULL);
|
||||
|
||||
case PDFIO_ENCRYPTION_RC4_128 :
|
||||
case PDFIO_ENCRYPTION_AES_128 :
|
||||
// Copy the key data for the MD5 hash.
|
||||
memcpy(data, pdf->file_key, sizeof(pdf->file_key));
|
||||
data[16] = (uint8_t)obj->number;
|
||||
data[17] = (uint8_t)(obj->number >> 8);
|
||||
data[18] = (uint8_t)(obj->number >> 16);
|
||||
data[19] = (uint8_t)obj->generation;
|
||||
data[20] = (uint8_t)(obj->generation >> 8);
|
||||
|
||||
// Hash it...
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, data, sizeof(data));
|
||||
if (pdf->encryption == PDFIO_ENCRYPTION_AES_128)
|
||||
_pdfioCryptoMD5Append(&md5, (const uint8_t *)"sAlT", 4);
|
||||
_pdfioCryptoMD5Finish(&md5, digest);
|
||||
|
||||
// Initialize the RC4/AES context using the digest...
|
||||
if (pdf->encryption == PDFIO_ENCRYPTION_RC4_128)
|
||||
{
|
||||
*ivlen = 0;
|
||||
_pdfioCryptoRC4Init(&ctx->rc4, digest, sizeof(digest));
|
||||
return ((_pdfio_crypto_cb_t)_pdfioCryptoRC4Crypt);
|
||||
}
|
||||
else
|
||||
{
|
||||
*ivlen = 16;
|
||||
_pdfioCryptoMakeRandom(iv, *ivlen);
|
||||
_pdfioCryptoAESInit(&ctx->aes, digest, sizeof(digest), iv);
|
||||
return ((_pdfio_crypto_cb_t)_pdfioCryptoAESEncrypt);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoUnlock()' - Unlock an encrypted PDF.
|
||||
//
|
||||
|
||||
bool // O - `true` on success, `false` otherwise
|
||||
_pdfioCryptoUnlock(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_password_cb_t password_cb, // I - Password callback or `NULL` for none
|
||||
void *password_data) // I - Password callback data, if any
|
||||
{
|
||||
int tries; // Number of tries
|
||||
const char *password = NULL; // Password to try
|
||||
pdfio_dict_t *encrypt_dict; // Encrypt objection dictionary
|
||||
int version, // Version value
|
||||
revision, // Revision value
|
||||
length; // Key length value
|
||||
const char *handler, // Security handler name
|
||||
*stream_filter, // Stream encryption filter
|
||||
*string_filter; // String encryption filter
|
||||
pdfio_dict_t *cf_dict; // CryptFilters dictionary
|
||||
unsigned char *owner_key, // Owner key
|
||||
*user_key, // User key
|
||||
*file_id; // File ID value
|
||||
size_t owner_keylen, // Length of owner key
|
||||
user_keylen, // Length of user key
|
||||
file_idlen; // Length of file ID
|
||||
_pdfio_md5_t md5; // MD5 context
|
||||
uint8_t file_digest[16]; // MD5 digest of file ID and pad
|
||||
|
||||
|
||||
// See if we support the type of encryption specified by the Encrypt object
|
||||
// dictionary...
|
||||
if ((encrypt_dict = pdfioObjGetDict(pdf->encrypt_obj)) == NULL)
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to get encryption dictionary.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
handler = pdfioDictGetName(encrypt_dict, "Filter");
|
||||
version = pdfioDictGetNumber(encrypt_dict, "V");
|
||||
revision = pdfioDictGetNumber(encrypt_dict, "R");
|
||||
length = pdfioDictGetNumber(encrypt_dict, "Length");
|
||||
stream_filter = pdfioDictGetName(encrypt_dict, "StmF");
|
||||
string_filter = pdfioDictGetName(encrypt_dict, "StrF");
|
||||
cf_dict = pdfioDictGetDict(encrypt_dict, "CF");
|
||||
|
||||
if (!handler || strcmp(handler, "Standard"))
|
||||
{
|
||||
_pdfioFileError(pdf, "Unsupported security handler '%s'.", handler ? handler : "(null)");
|
||||
return (false);
|
||||
}
|
||||
|
||||
if (version == 4 && revision == 4)
|
||||
{
|
||||
// Lookup crypt filter to see if we support it...
|
||||
pdfio_dict_t *filter; // Crypt Filter
|
||||
const char *cfm; // Crypt filter method
|
||||
|
||||
if ((filter = pdfioDictGetDict(cf_dict, stream_filter)) != NULL && (cfm = pdfioDictGetName(filter, "CFM")) != NULL)
|
||||
{
|
||||
if (!strcmp(cfm, "V2"))
|
||||
{
|
||||
pdf->encryption = PDFIO_ENCRYPTION_RC4_128;
|
||||
if (length < 40 || length > 128)
|
||||
length = 128;
|
||||
}
|
||||
if (!strcmp(cfm, "AESV2"))
|
||||
{
|
||||
pdf->encryption = PDFIO_ENCRYPTION_AES_128;
|
||||
length = 128;
|
||||
}
|
||||
}
|
||||
}
|
||||
else if (version == 2)
|
||||
{
|
||||
if (revision == 2)
|
||||
{
|
||||
pdf->encryption = PDFIO_ENCRYPTION_RC4_40;
|
||||
length = 40;
|
||||
}
|
||||
else if (revision == 3)
|
||||
{
|
||||
pdf->encryption = PDFIO_ENCRYPTION_RC4_128;
|
||||
if (length < 40 || length > 128)
|
||||
length = 128;
|
||||
}
|
||||
}
|
||||
// TODO: Implement AES-256 - V6 R6
|
||||
|
||||
if (pdf->encryption == PDFIO_ENCRYPTION_NONE)
|
||||
{
|
||||
_pdfioFileError(pdf, "Unsupported encryption V%d R%d.", version, revision);
|
||||
return (false);
|
||||
}
|
||||
|
||||
// Grab the remaining values we need to unlock the PDF...
|
||||
pdf->file_keylen = length / 8;
|
||||
pdf->permissions = pdfioDictGetNumber(encrypt_dict, "P");
|
||||
|
||||
owner_key = pdfioDictGetBinary(encrypt_dict, "O", &owner_keylen);
|
||||
user_key = pdfioDictGetBinary(encrypt_dict, "U", &user_keylen);
|
||||
|
||||
if (!owner_key || owner_keylen < 32 || owner_keylen > sizeof(pdf->owner_key))
|
||||
{
|
||||
_pdfioFileError(pdf, "Missing or bad owner key, unable to unlock file.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
memcpy(pdf->owner_key, owner_key, owner_keylen);
|
||||
pdf->owner_keylen = owner_keylen;
|
||||
|
||||
if (!user_key || user_keylen < 32 || user_keylen > sizeof(pdf->user_key))
|
||||
{
|
||||
_pdfioFileError(pdf, "Missing or bad user key, unable to unlock file.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
memcpy(pdf->user_key, user_key, user_keylen);
|
||||
pdf->user_keylen = user_keylen;
|
||||
|
||||
if ((file_id = pdfioArrayGetBinary(pdf->id_array, 0, &file_idlen)) == NULL || file_idlen < 16)
|
||||
{
|
||||
_pdfioFileError(pdf, "Missing or bad file ID, unable to unlock file.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
// Generate a base hash from known values...
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, pdf_passpad, 32);
|
||||
_pdfioCryptoMD5Append(&md5, file_id, file_idlen);
|
||||
_pdfioCryptoMD5Finish(&md5, file_digest);
|
||||
|
||||
// Now try to unlock the PDF...
|
||||
for (tries = 0; tries < 4; tries ++)
|
||||
{
|
||||
if (pdf->encryption <= PDFIO_ENCRYPTION_AES_128)
|
||||
{
|
||||
uint8_t pad[32], // Padded password
|
||||
file_key[16], // File key
|
||||
owner_key[32], // Owner key
|
||||
user_pad[32], // Padded user password
|
||||
user_key[32], // User key
|
||||
pdf_user_key[32]; // Decrypted user key
|
||||
|
||||
// Pad the supplied password, if any...
|
||||
pad_password(password, pad);
|
||||
|
||||
// Generate keys to see if things match...
|
||||
PDFIO_DEBUG("\nTrying %02X%02X%02X%02X...%02X%02X%02X%02X\n", pad[0], pad[1], pad[2], pad[3], pad[28], pad[29], pad[30], pad[31]);
|
||||
PDFIO_DEBUG("P=%d\n", pdf->permissions);
|
||||
PDFIO_DEBUG("Fid(%d)=%02X%02X%02X%02X...%02X%02X%02X%02X\n", (int)file_idlen, file_id[0], file_id[1], file_id[2], file_id[3], file_id[12], file_id[13], file_id[14], file_id[15]);
|
||||
|
||||
make_owner_key(pdf->encryption, pad, pdf->owner_key, user_pad);
|
||||
PDFIO_DEBUG("Upad=%02X%02X%02X%02X...%02X%02X%02X%02X\n", user_pad[0], user_pad[1], user_pad[2], user_pad[3], user_pad[28], user_pad[29], user_pad[30], user_pad[31]);
|
||||
|
||||
make_file_key(pdf->encryption, pdf->permissions, file_id, file_idlen, user_pad, pdf->owner_key, file_key);
|
||||
PDFIO_DEBUG("Fown=%02X%02X%02X%02X...%02X%02X%02X%02X\n", file_key[0], file_key[1], file_key[2], file_key[3], file_key[12], file_key[13], file_key[14], file_key[15]);
|
||||
|
||||
make_user_key(pdf->encryption, file_id, file_idlen, user_key);
|
||||
|
||||
PDFIO_DEBUG("U=%02X%02X%02X%02X...%02X%02X%02X%02X\n", pdf->user_key[0], pdf->user_key[1], pdf->user_key[2], pdf->user_key[3], pdf->user_key[28], pdf->user_key[29], pdf->user_key[30], pdf->user_key[31]);
|
||||
PDFIO_DEBUG("Uown=%02X%02X%02X%02X...%02X%02X%02X%02X\n", user_key[0], user_key[1], user_key[2], user_key[3], user_key[28], user_key[29], user_key[30], user_key[31]);
|
||||
|
||||
if (!memcmp(user_key, pdf->user_key, sizeof(user_key)))
|
||||
{
|
||||
// Matches!
|
||||
memcpy(pdf->file_key, file_key, sizeof(pdf->file_key));
|
||||
return (true);
|
||||
}
|
||||
|
||||
/*
|
||||
* Not the owner password, try the user password...
|
||||
*/
|
||||
|
||||
make_file_key(pdf->encryption, pdf->permissions, file_id, file_idlen, pad, pdf->owner_key, file_key);
|
||||
PDFIO_DEBUG("Fuse=%02X%02X%02X%02X...%02X%02X%02X%02X\n", file_key[0], file_key[1], file_key[2], file_key[3], file_key[12], file_key[13], file_key[14], file_key[15]);
|
||||
|
||||
make_user_key(pdf->encryption, file_id, file_idlen, user_key);
|
||||
|
||||
memcpy(pdf_user_key, pdf->user_key, sizeof(pdf_user_key));
|
||||
decrypt_user_key(pdf->encryption, file_key, pdf_user_key);
|
||||
|
||||
PDFIO_DEBUG("Uuse=%02X%02X%02X%02X...%02X%02X%02X%02X\n", user_key[0], user_key[1], user_key[2], user_key[3], user_key[28], user_key[29], user_key[30], user_key[31]);
|
||||
PDFIO_DEBUG("Updf=%02X%02X%02X%02X...%02X%02X%02X%02X\n", pdf_user_key[0], pdf_user_key[1], pdf_user_key[2], pdf_user_key[3], pdf_user_key[28], pdf_user_key[29], pdf_user_key[30], pdf_user_key[31]);
|
||||
|
||||
if (!memcmp(user_key, pdf_user_key, 16))
|
||||
{
|
||||
// Matches!
|
||||
memcpy(pdf->file_key, file_key, sizeof(pdf->file_key));
|
||||
return (true);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// TODO: Implement AES-256 security handler
|
||||
}
|
||||
|
||||
// If we get here we need to try another password...
|
||||
if (password_cb)
|
||||
password = (password_cb)(password_data, pdf->filename);
|
||||
|
||||
if (!password)
|
||||
break;
|
||||
}
|
||||
|
||||
_pdfioFileError(pdf, "Unable to unlock PDF file.");
|
||||
|
||||
return (false);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'decrypt_user_key()' - Decrypt the user key.
|
||||
//
|
||||
|
||||
static void
|
||||
decrypt_user_key(
|
||||
pdfio_encryption_t encryption, // I - Type of encryption
|
||||
const uint8_t *file_key, // I - File encryption key
|
||||
uint8_t user_key[32]) // IO - User key
|
||||
{
|
||||
size_t i, j; // Looping vars
|
||||
_pdfio_rc4_t rc4; // RC4 encryption context
|
||||
|
||||
|
||||
if (encryption == PDFIO_ENCRYPTION_RC4_40)
|
||||
{
|
||||
// Encrypt the result once...
|
||||
_pdfioCryptoRC4Init(&rc4, file_key, 5);
|
||||
_pdfioCryptoRC4Crypt(&rc4, user_key, user_key, 32);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Encrypt the result 20 times...
|
||||
uint8_t key[16]; // Current encryption key
|
||||
|
||||
for (i = 19; i > 0; i --)
|
||||
{
|
||||
// XOR each byte in the key with the loop counter...
|
||||
for (j = 0; j < 16; j ++)
|
||||
key[j] = (uint8_t)(file_key[j] ^ i);
|
||||
|
||||
_pdfioCryptoRC4Init(&rc4, key, 16);
|
||||
_pdfioCryptoRC4Crypt(&rc4, user_key, user_key, 32);
|
||||
}
|
||||
|
||||
_pdfioCryptoRC4Init(&rc4, file_key, 16);
|
||||
_pdfioCryptoRC4Crypt(&rc4, user_key, user_key, 32);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'encrypt_user_key()' - Encrypt the user key.
|
||||
//
|
||||
|
||||
static void
|
||||
encrypt_user_key(
|
||||
pdfio_encryption_t encryption, // I - Type of encryption
|
||||
const uint8_t *file_key, // I - File encryption key
|
||||
uint8_t user_key[32]) // IO - User key
|
||||
{
|
||||
size_t i, j; // Looping vars
|
||||
_pdfio_rc4_t rc4; // RC4 encryption context
|
||||
|
||||
|
||||
if (encryption == PDFIO_ENCRYPTION_RC4_40)
|
||||
{
|
||||
// Encrypt the result once...
|
||||
_pdfioCryptoRC4Init(&rc4, file_key, 5);
|
||||
_pdfioCryptoRC4Crypt(&rc4, user_key, user_key, 32);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Encrypt the result 20 times...
|
||||
uint8_t key[16]; // Current encryption key
|
||||
|
||||
for (i = 0; i < 20; i ++)
|
||||
{
|
||||
// XOR each byte in the key with the loop counter...
|
||||
for (j = 0; j < 16; j ++)
|
||||
key[j] = (uint8_t)(file_key[j] ^ i);
|
||||
|
||||
_pdfioCryptoRC4Init(&rc4, key, 16);
|
||||
_pdfioCryptoRC4Crypt(&rc4, user_key, user_key, 32);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'make_file_key()' - Make the file encryption key.
|
||||
//
|
||||
|
||||
static void
|
||||
make_file_key(
|
||||
pdfio_encryption_t encryption, // I - Type of encryption
|
||||
pdfio_permission_t permissions, // I - File permissions
|
||||
const unsigned char *file_id, // I - File ID value
|
||||
size_t file_idlen, // I - Length of file ID
|
||||
const uint8_t *user_pad, // I - Padded user password
|
||||
const uint8_t *owner_key, // I - Owner key
|
||||
uint8_t file_key[16]) // O - Encryption key
|
||||
{
|
||||
size_t i, j; // Looping vars
|
||||
uint8_t perm_bytes[4]; // Permissions bytes
|
||||
_pdfio_md5_t md5; // MD5 context
|
||||
uint8_t digest[16]; // 128-bit MD5 digest
|
||||
_pdfio_rc4_t rc4; // RC4 encryption context
|
||||
|
||||
|
||||
perm_bytes[0] = (uint8_t)permissions;
|
||||
perm_bytes[1] = (uint8_t)(permissions >> 8);
|
||||
perm_bytes[2] = (uint8_t)(permissions >> 16);
|
||||
perm_bytes[3] = (uint8_t)(permissions >> 24);
|
||||
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, user_pad, 32);
|
||||
_pdfioCryptoMD5Append(&md5, owner_key, 32);
|
||||
_pdfioCryptoMD5Append(&md5, perm_bytes, 4);
|
||||
_pdfioCryptoMD5Append(&md5, file_id, file_idlen);
|
||||
_pdfioCryptoMD5Finish(&md5, digest);
|
||||
|
||||
if (encryption != PDFIO_ENCRYPTION_RC4_40)
|
||||
{
|
||||
// MD5 the result 50 times..
|
||||
for (i = 0; i < 50; i ++)
|
||||
{
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, digest, 16);
|
||||
_pdfioCryptoMD5Finish(&md5, digest);
|
||||
}
|
||||
}
|
||||
|
||||
memcpy(file_key, digest, 16);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'make_owner_key()' - Generate the (encrypted) owner key...
|
||||
//
|
||||
|
||||
static void
|
||||
make_owner_key(
|
||||
pdfio_encryption_t encryption, // I - Type of encryption
|
||||
const uint8_t *owner_pad, // I - Padded owner password
|
||||
const uint8_t *user_pad, // I - Padded user password
|
||||
uint8_t owner_key[32]) // O - Owner key value
|
||||
{
|
||||
size_t i, j; // Looping vars
|
||||
_pdfio_md5_t md5; // MD5 context
|
||||
uint8_t digest[16]; // 128-bit MD5 digest
|
||||
_pdfio_rc4_t rc4; // RC4 encryption context
|
||||
|
||||
|
||||
// Hash the owner password...
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, owner_pad, 32);
|
||||
_pdfioCryptoMD5Finish(&md5, digest);
|
||||
|
||||
if (encryption != PDFIO_ENCRYPTION_RC4_40)
|
||||
{
|
||||
for (i = 0; i < 50; i ++)
|
||||
{
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, digest, 16);
|
||||
_pdfioCryptoMD5Finish(&md5, digest);
|
||||
}
|
||||
}
|
||||
|
||||
// Copy and encrypt the padded user password...
|
||||
memcpy(owner_key, user_pad, 32);
|
||||
|
||||
if (encryption == PDFIO_ENCRYPTION_RC4_40)
|
||||
{
|
||||
// Encrypt once...
|
||||
_pdfioCryptoRC4Init(&rc4, digest, 5);
|
||||
_pdfioCryptoRC4Crypt(&rc4, owner_key, owner_key, 32);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Encrypt 20 times...
|
||||
uint8_t encrypt_key[16]; // RC4 encryption key
|
||||
|
||||
for (i = 0; i < 20; i ++)
|
||||
{
|
||||
// XOR each byte in the digest with the loop counter to make a key...
|
||||
for (j = 0; j < sizeof(encrypt_key); j ++)
|
||||
encrypt_key[j] = (uint8_t)(digest[j] ^ i);
|
||||
|
||||
_pdfioCryptoRC4Init(&rc4, encrypt_key, sizeof(encrypt_key));
|
||||
_pdfioCryptoRC4Crypt(&rc4, owner_key, owner_key, 32);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'make_user_key()' - Make the user key.
|
||||
//
|
||||
|
||||
static void
|
||||
make_user_key(
|
||||
pdfio_encryption_t encryption, // I - Type of encryption
|
||||
const unsigned char *file_id, // I - File ID value
|
||||
size_t file_idlen, // I - Length of file ID
|
||||
uint8_t user_key[32]) // O - User key
|
||||
{
|
||||
_pdfio_md5_t md5; // MD5 context
|
||||
uint8_t digest[16]; // 128-bit MD5 digest
|
||||
|
||||
|
||||
// Generate a base hash from known values...
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, pdf_passpad, 32);
|
||||
_pdfioCryptoMD5Append(&md5, file_id, file_idlen);
|
||||
_pdfioCryptoMD5Finish(&md5, user_key);
|
||||
|
||||
memset(user_key + 16, 0, 16);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'pad_password()' - Generate a padded password.
|
||||
//
|
||||
|
||||
static void
|
||||
pad_password(const char *password, // I - Password string or `NULL`
|
||||
uint8_t pad[32]) // O - Padded password
|
||||
{
|
||||
size_t len; // Length of password
|
||||
|
||||
|
||||
if (password)
|
||||
{
|
||||
// Use the specified password
|
||||
if ((len = strlen(password)) > 32)
|
||||
len = 32;
|
||||
}
|
||||
else
|
||||
{
|
||||
// No password
|
||||
len = 0;
|
||||
}
|
||||
|
||||
if (len > 0)
|
||||
memcpy(pad, password, len);
|
||||
if (len < 32)
|
||||
memcpy(pad + len, pdf_passpad, 32 - len);
|
||||
}
|
||||
39
pdfio-dict.c
39
pdfio-dict.c
@ -21,6 +21,39 @@
|
||||
static int compare_pairs(_pdfio_pair_t *a, _pdfio_pair_t *b);
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioDictClear()' - Remove a key/value pair from a dictionary.
|
||||
//
|
||||
|
||||
void
|
||||
_pdfioDictClear(pdfio_dict_t *dict, // I - Dictionary
|
||||
const char *key) // I - Key
|
||||
{
|
||||
size_t idx; // Index into pairs
|
||||
_pdfio_pair_t *pair, // Current pair
|
||||
pkey; // Search key
|
||||
|
||||
|
||||
PDFIO_DEBUG("_pdfioDictClear(dict=%p, key=\"%s\")\n", dict, key);
|
||||
|
||||
// See if the key is already set...
|
||||
if (dict->num_pairs > 0)
|
||||
{
|
||||
pkey.key = key;
|
||||
|
||||
if ((pair = (_pdfio_pair_t *)bsearch(&pkey, dict->pairs, dict->num_pairs, sizeof(_pdfio_pair_t), (int (*)(const void *, const void *))compare_pairs)) != NULL)
|
||||
{
|
||||
// Yes, remove it...
|
||||
idx = (size_t)(pair - dict->pairs);
|
||||
dict->num_pairs --;
|
||||
|
||||
if (idx < dict->num_pairs)
|
||||
memmove(pair, pair + 1, (dict->num_pairs - idx) * sizeof(_pdfio_pair_t));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'pdfioDictCopy()' - Copy a dictionary to a PDF file.
|
||||
//
|
||||
@ -420,6 +453,7 @@ _pdfioDictGetValue(pdfio_dict_t *dict, // I - Dictionary
|
||||
|
||||
pdfio_dict_t * // O - New dictionary
|
||||
_pdfioDictRead(pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_obj_t *obj, // I - Object, if any
|
||||
_pdfio_token_t *tb) // I - Token buffer/stack
|
||||
{
|
||||
pdfio_dict_t *dict; // New dictionary
|
||||
@ -448,7 +482,7 @@ _pdfioDictRead(pdfio_file_t *pdf, // I - PDF file
|
||||
}
|
||||
|
||||
// Then get the next value...
|
||||
if (!_pdfioValueRead(pdf, tb, &value))
|
||||
if (!_pdfioValueRead(pdf, obj, tb, &value))
|
||||
{
|
||||
_pdfioFileError(pdf, "Missing value for dictionary key.");
|
||||
break;
|
||||
@ -850,6 +884,7 @@ _pdfioDictSetValue(
|
||||
|
||||
bool // O - `true` on success, `false` on failure
|
||||
_pdfioDictWrite(pdfio_dict_t *dict, // I - Dictionary
|
||||
pdfio_obj_t *obj, // I - Object, if any
|
||||
off_t *length) // I - Offset to length value
|
||||
{
|
||||
pdfio_file_t *pdf = dict->pdf; // PDF file
|
||||
@ -877,7 +912,7 @@ _pdfioDictWrite(pdfio_dict_t *dict, // I - Dictionary
|
||||
if (!_pdfioFilePuts(pdf, " 9999999999"))
|
||||
return (false);
|
||||
}
|
||||
else if (!_pdfioValueWrite(pdf, &pair->value, NULL))
|
||||
else if (!_pdfioValueWrite(pdf, obj, &pair->value, NULL))
|
||||
return (false);
|
||||
}
|
||||
|
||||
|
||||
302
pdfio-file.c
302
pdfio-file.c
@ -26,7 +26,7 @@ static int compare_objmaps(_pdfio_objmap_t *a, _pdfio_objmap_t *b);
|
||||
static int compare_objs(pdfio_obj_t **a, pdfio_obj_t **b);
|
||||
static bool load_obj_stream(pdfio_obj_t *obj);
|
||||
static bool load_pages(pdfio_file_t *pdf, pdfio_obj_t *obj);
|
||||
static bool load_xref(pdfio_file_t *pdf, off_t xref_offset);
|
||||
static bool load_xref(pdfio_file_t *pdf, off_t xref_offset, pdfio_password_cb_t password_cb, void *password_data);
|
||||
static bool write_catalog(pdfio_file_t *pdf);
|
||||
static bool write_pages(pdfio_file_t *pdf);
|
||||
static bool write_trailer(pdfio_file_t *pdf);
|
||||
@ -123,7 +123,7 @@ pdfioFileClose(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
ret = false;
|
||||
|
||||
if (pdfioObjClose(pdf->info))
|
||||
if (pdfioObjClose(pdf->info_obj))
|
||||
if (write_pages(pdf))
|
||||
if (write_catalog(pdf))
|
||||
if (write_trailer(pdf))
|
||||
@ -193,6 +193,7 @@ pdfioFileCreate(
|
||||
pdfio_file_t *pdf; // PDF file
|
||||
pdfio_dict_t *dict; // Dictionary for pages object
|
||||
pdfio_dict_t *info_dict; // Dictionary for information object
|
||||
unsigned char id_value[16]; // File ID value
|
||||
|
||||
|
||||
// Range check input...
|
||||
@ -220,13 +221,14 @@ pdfioFileCreate(
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
pdf->filename = strdup(filename);
|
||||
pdf->version = strdup(version);
|
||||
pdf->mode = _PDFIO_MODE_WRITE;
|
||||
pdf->error_cb = error_cb;
|
||||
pdf->error_data = error_data;
|
||||
pdf->bufptr = pdf->buffer;
|
||||
pdf->bufend = pdf->buffer + sizeof(pdf->buffer);
|
||||
pdf->filename = strdup(filename);
|
||||
pdf->version = strdup(version);
|
||||
pdf->mode = _PDFIO_MODE_WRITE;
|
||||
pdf->error_cb = error_cb;
|
||||
pdf->error_data = error_data;
|
||||
pdf->permissions = PDFIO_PERMISSION_ALL;
|
||||
pdf->bufptr = pdf->buffer;
|
||||
pdf->bufend = pdf->buffer + sizeof(pdf->buffer);
|
||||
|
||||
if (media_box)
|
||||
{
|
||||
@ -278,7 +280,7 @@ pdfioFileCreate(
|
||||
|
||||
pdfioDictSetName(dict, "Type", "Pages");
|
||||
|
||||
if ((pdf->pages_root = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||||
if ((pdf->pages_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||||
{
|
||||
pdfioFileClose(pdf);
|
||||
unlink(filename);
|
||||
@ -296,13 +298,22 @@ pdfioFileCreate(
|
||||
pdfioDictSetDate(info_dict, "CreationDate", time(NULL));
|
||||
pdfioDictSetString(info_dict, "Producer", "pdfio/" PDFIO_VERSION);
|
||||
|
||||
if ((pdf->info = pdfioFileCreateObj(pdf, info_dict)) == NULL)
|
||||
if ((pdf->info_obj = pdfioFileCreateObj(pdf, info_dict)) == NULL)
|
||||
{
|
||||
pdfioFileClose(pdf);
|
||||
unlink(filename);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
// Create random file ID values...
|
||||
_pdfioCryptoMakeRandom(id_value, sizeof(id_value));
|
||||
|
||||
if ((pdf->id_array = pdfioArrayCreate(pdf)) != NULL)
|
||||
{
|
||||
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
|
||||
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
|
||||
}
|
||||
|
||||
return (pdf);
|
||||
}
|
||||
|
||||
@ -458,6 +469,7 @@ pdfioFileCreateOutput(
|
||||
pdfio_file_t *pdf; // PDF file
|
||||
pdfio_dict_t *dict; // Dictionary for pages object
|
||||
pdfio_dict_t *info_dict; // Dictionary for information object
|
||||
unsigned char id_value[16]; // File ID value
|
||||
|
||||
|
||||
// Range check input...
|
||||
@ -485,13 +497,14 @@ pdfioFileCreateOutput(
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
pdf->filename = strdup("output.pdf");
|
||||
pdf->version = strdup(version);
|
||||
pdf->mode = _PDFIO_MODE_WRITE;
|
||||
pdf->error_cb = error_cb;
|
||||
pdf->error_data = error_data;
|
||||
pdf->bufptr = pdf->buffer;
|
||||
pdf->bufend = pdf->buffer + sizeof(pdf->buffer);
|
||||
pdf->filename = strdup("output.pdf");
|
||||
pdf->version = strdup(version);
|
||||
pdf->mode = _PDFIO_MODE_WRITE;
|
||||
pdf->error_cb = error_cb;
|
||||
pdf->error_data = error_data;
|
||||
pdf->permissions = PDFIO_PERMISSION_ALL;
|
||||
pdf->bufptr = pdf->buffer;
|
||||
pdf->bufend = pdf->buffer + sizeof(pdf->buffer);
|
||||
|
||||
if (media_box)
|
||||
{
|
||||
@ -536,7 +549,7 @@ pdfioFileCreateOutput(
|
||||
|
||||
pdfioDictSetName(dict, "Type", "Pages");
|
||||
|
||||
if ((pdf->pages_root = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||||
if ((pdf->pages_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||||
{
|
||||
pdfioFileClose(pdf);
|
||||
return (NULL);
|
||||
@ -552,12 +565,21 @@ pdfioFileCreateOutput(
|
||||
pdfioDictSetDate(info_dict, "CreationDate", time(NULL));
|
||||
pdfioDictSetString(info_dict, "Producer", "pdfio/" PDFIO_VERSION);
|
||||
|
||||
if ((pdf->info = pdfioFileCreateObj(pdf, info_dict)) == NULL)
|
||||
if ((pdf->info_obj = pdfioFileCreateObj(pdf, info_dict)) == NULL)
|
||||
{
|
||||
pdfioFileClose(pdf);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
// Create random file ID values...
|
||||
_pdfioCryptoMakeRandom(id_value, sizeof(id_value));
|
||||
|
||||
if ((pdf->id_array = pdfioArrayCreate(pdf)) != NULL)
|
||||
{
|
||||
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
|
||||
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
|
||||
}
|
||||
|
||||
return (pdf);
|
||||
}
|
||||
|
||||
@ -595,7 +617,7 @@ pdfioFileCreatePage(pdfio_file_t *pdf, // I - PDF file
|
||||
if (!_pdfioDictGetValue(dict, "MediaBox"))
|
||||
pdfioDictSetRect(dict, "MediaBox", &pdf->media_box);
|
||||
|
||||
pdfioDictSetObj(dict, "Parent", pdf->pages_root);
|
||||
pdfioDictSetObj(dict, "Parent", pdf->pages_obj);
|
||||
|
||||
if (!_pdfioDictGetValue(dict, "Resources"))
|
||||
pdfioDictSetDict(dict, "Resources", pdfioDictCreate(pdf));
|
||||
@ -701,7 +723,7 @@ pdfioFileFindObj(
|
||||
const char * // O - Author or `NULL` for none
|
||||
pdfioFileGetAuthor(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetString(pdf->info->value.value.dict, "Author") : NULL);
|
||||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Author") : NULL);
|
||||
}
|
||||
|
||||
|
||||
@ -713,7 +735,7 @@ time_t // O - Creation date or `0` for none
|
||||
pdfioFileGetCreationDate(
|
||||
pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetDate(pdf->info->value.value.dict, "CreationDate") : 0);
|
||||
return (pdf && pdf->info_obj ? pdfioDictGetDate(pdf->info_obj->value.value.dict, "CreationDate") : 0);
|
||||
}
|
||||
|
||||
|
||||
@ -724,7 +746,7 @@ pdfioFileGetCreationDate(
|
||||
const char * // O - Creator string or `NULL` for none
|
||||
pdfioFileGetCreator(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetString(pdf->info->value.value.dict, "Creator") : NULL);
|
||||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Creator") : NULL);
|
||||
}
|
||||
|
||||
|
||||
@ -735,7 +757,7 @@ pdfioFileGetCreator(pdfio_file_t *pdf) // I - PDF file
|
||||
pdfio_array_t * // O - Array with binary strings
|
||||
pdfioFileGetID(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetArray(pdf->trailer, "ID") : NULL);
|
||||
return (pdf ? pdf->id_array : NULL);
|
||||
}
|
||||
|
||||
|
||||
@ -746,7 +768,7 @@ pdfioFileGetID(pdfio_file_t *pdf) // I - PDF file
|
||||
const char * // O - Keywords string or `NULL` for none
|
||||
pdfioFileGetKeywords(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetString(pdf->info->value.value.dict, "Keywords") : NULL);
|
||||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Keywords") : NULL);
|
||||
}
|
||||
|
||||
|
||||
@ -814,6 +836,35 @@ pdfioFileGetPage(pdfio_file_t *pdf, // I - PDF file
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'pdfioFileGetPermissions()' - Get the access permissions of a PDF file.
|
||||
//
|
||||
// This function returns the access permissions of a PDF file and (optionally)
|
||||
// the type of encryption that has been used.
|
||||
//
|
||||
|
||||
pdfio_permission_t // O - Permission bits
|
||||
pdfioFileGetPermissions(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_encryption_t *encryption) // O - Type of encryption used or `NULL` to ignore
|
||||
{
|
||||
// Range check input...
|
||||
if (!pdf)
|
||||
{
|
||||
if (encryption)
|
||||
*encryption = PDFIO_ENCRYPTION_NONE;
|
||||
|
||||
return (PDFIO_PERMISSION_ALL);
|
||||
}
|
||||
|
||||
// Return values...
|
||||
if (encryption)
|
||||
*encryption = pdf->encryption;
|
||||
|
||||
return (pdf->permissions);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'pdfioFileGetProducer()' - Get the producer string for a PDF file.
|
||||
//
|
||||
@ -821,7 +872,7 @@ pdfioFileGetPage(pdfio_file_t *pdf, // I - PDF file
|
||||
const char * // O - Producer string or `NULL` for none
|
||||
pdfioFileGetProducer(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetString(pdf->info->value.value.dict, "Producer") : NULL);
|
||||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Producer") : NULL);
|
||||
}
|
||||
|
||||
|
||||
@ -832,7 +883,7 @@ pdfioFileGetProducer(pdfio_file_t *pdf) // I - PDF file
|
||||
const char * // O - Subject or `NULL` for none
|
||||
pdfioFileGetSubject(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetString(pdf->info->value.value.dict, "Subject") : NULL);
|
||||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Subject") : NULL);
|
||||
}
|
||||
|
||||
|
||||
@ -843,7 +894,7 @@ pdfioFileGetSubject(pdfio_file_t *pdf) // I - PDF file
|
||||
const char * // O - Title or `NULL` for none
|
||||
pdfioFileGetTitle(pdfio_file_t *pdf) // I - PDF file
|
||||
{
|
||||
return (pdf && pdf->info ? pdfioDictGetString(pdf->info->value.value.dict, "Title") : NULL);
|
||||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Title") : NULL);
|
||||
}
|
||||
|
||||
|
||||
@ -890,9 +941,6 @@ pdfioFileOpen(
|
||||
off_t xref_offset; // Offset to xref table
|
||||
|
||||
|
||||
(void)password_cb;
|
||||
(void)password_data;
|
||||
|
||||
// Range check input...
|
||||
if (!filename)
|
||||
return (NULL);
|
||||
@ -915,10 +963,11 @@ pdfioFileOpen(
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
pdf->filename = strdup(filename);
|
||||
pdf->mode = _PDFIO_MODE_READ;
|
||||
pdf->error_cb = error_cb;
|
||||
pdf->error_data = error_data;
|
||||
pdf->filename = strdup(filename);
|
||||
pdf->mode = _PDFIO_MODE_READ;
|
||||
pdf->error_cb = error_cb;
|
||||
pdf->error_data = error_data;
|
||||
pdf->permissions = PDFIO_PERMISSION_ALL;
|
||||
|
||||
// Open the file...
|
||||
if ((pdf->fd = open(filename, O_RDONLY | O_BINARY)) < 0)
|
||||
@ -965,7 +1014,7 @@ pdfioFileOpen(
|
||||
|
||||
xref_offset = (off_t)strtol(ptr + 9, NULL, 10);
|
||||
|
||||
if (!load_xref(pdf, xref_offset))
|
||||
if (!load_xref(pdf, xref_offset, password_cb, password_data))
|
||||
goto error;
|
||||
|
||||
return (pdf);
|
||||
@ -988,8 +1037,8 @@ void
|
||||
pdfioFileSetAuthor(pdfio_file_t *pdf, // I - PDF file
|
||||
const char *value) // I - Value
|
||||
{
|
||||
if (pdf && pdf->info)
|
||||
pdfioDictSetString(pdf->info->value.value.dict, "Author", pdfioStringCreate(pdf, value));
|
||||
if (pdf && pdf->info_obj)
|
||||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Author", pdfioStringCreate(pdf, value));
|
||||
}
|
||||
|
||||
|
||||
@ -1002,8 +1051,8 @@ pdfioFileSetCreationDate(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
time_t value) // I - Value
|
||||
{
|
||||
if (pdf && pdf->info)
|
||||
pdfioDictSetDate(pdf->info->value.value.dict, "CreationDate", value);
|
||||
if (pdf && pdf->info_obj)
|
||||
pdfioDictSetDate(pdf->info_obj->value.value.dict, "CreationDate", value);
|
||||
}
|
||||
|
||||
|
||||
@ -1015,8 +1064,8 @@ void
|
||||
pdfioFileSetCreator(pdfio_file_t *pdf, // I - PDF file
|
||||
const char *value)// I - Value
|
||||
{
|
||||
if (pdf && pdf->info)
|
||||
pdfioDictSetString(pdf->info->value.value.dict, "Creator", pdfioStringCreate(pdf, value));
|
||||
if (pdf && pdf->info_obj)
|
||||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Creator", pdfioStringCreate(pdf, value));
|
||||
}
|
||||
|
||||
|
||||
@ -1029,8 +1078,44 @@ pdfioFileSetKeywords(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
const char *value) // I - Value
|
||||
{
|
||||
if (pdf && pdf->info)
|
||||
pdfioDictSetString(pdf->info->value.value.dict, "Keywords", pdfioStringCreate(pdf, value));
|
||||
if (pdf && pdf->info_obj)
|
||||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Keywords", pdfioStringCreate(pdf, value));
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'pdfioFileSetPermissions()' - Set the PDF permissions, encryption mode, and passwords.
|
||||
//
|
||||
// This function sets the PDF usage permissions, encryption mode, and
|
||||
// passwords.
|
||||
//
|
||||
// > *Note*: This function must be called before creating or copying any
|
||||
// > objects. Due to fundamental limitations in the PDF format, PDF encryption
|
||||
// > offers little protection from disclosure. Permissions are not enforced in
|
||||
// > any meaningful way.
|
||||
//
|
||||
|
||||
bool // O - `true` on success, `false` otherwise
|
||||
pdfioFileSetPermissions(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_permission_t permissions, // I - Use permissions
|
||||
pdfio_encryption_t encryption, // I - Type of encryption to use
|
||||
const char *owner_password, // I - Owner password, if any
|
||||
const char *user_password) // I - User password, if any
|
||||
{
|
||||
if (!pdf)
|
||||
return (false);
|
||||
|
||||
if (pdf->num_objs > 2) // First two objects are pages and info
|
||||
{
|
||||
_pdfioFileError(pdf, "You must call pdfioFileSetPermissions before adding any objects.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
if (encryption == PDFIO_ENCRYPTION_NONE)
|
||||
return (true);
|
||||
|
||||
return (_pdfioCryptoLock(pdf, permissions, encryption, owner_password, user_password));
|
||||
}
|
||||
|
||||
|
||||
@ -1039,11 +1124,12 @@ pdfioFileSetKeywords(
|
||||
//
|
||||
|
||||
void
|
||||
pdfioFileSetSubject(pdfio_file_t *pdf, // I - PDF file
|
||||
const char *value)// I - Value
|
||||
pdfioFileSetSubject(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
const char *value) // I - Value
|
||||
{
|
||||
if (pdf && pdf->info)
|
||||
pdfioDictSetString(pdf->info->value.value.dict, "Subject", pdfioStringCreate(pdf, value));
|
||||
if (pdf && pdf->info_obj)
|
||||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Subject", pdfioStringCreate(pdf, value));
|
||||
}
|
||||
|
||||
|
||||
@ -1055,8 +1141,8 @@ void
|
||||
pdfioFileSetTitle(pdfio_file_t *pdf, // I - PDF file
|
||||
const char *value) // I - Value
|
||||
{
|
||||
if (pdf && pdf->info)
|
||||
pdfioDictSetString(pdf->info->value.value.dict, "Title", pdfioStringCreate(pdf, value));
|
||||
if (pdf && pdf->info_obj)
|
||||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Title", pdfioStringCreate(pdf, value));
|
||||
}
|
||||
|
||||
|
||||
@ -1226,7 +1312,7 @@ load_obj_stream(pdfio_obj_t *obj) // I - Object to load
|
||||
// Read the objects themselves...
|
||||
for (cur_obj = 0; cur_obj < num_objs; cur_obj ++)
|
||||
{
|
||||
if (!_pdfioValueRead(obj->pdf, &tb, &(objs[cur_obj]->value)))
|
||||
if (!_pdfioValueRead(obj->pdf, obj, &tb, &(objs[cur_obj]->value)))
|
||||
{
|
||||
pdfioStreamClose(st);
|
||||
return (false);
|
||||
@ -1313,8 +1399,11 @@ load_pages(pdfio_file_t *pdf, // I - PDF file
|
||||
//
|
||||
|
||||
static bool // O - `true` on success, `false` on failure
|
||||
load_xref(pdfio_file_t *pdf, // I - PDF file
|
||||
off_t xref_offset) // I - Offset to xref
|
||||
load_xref(
|
||||
pdfio_file_t *pdf, // I - PDF file
|
||||
off_t xref_offset, // I - Offset to xref
|
||||
pdfio_password_cb_t password_cb, // I - Password callback or `NULL` for none
|
||||
void *password_data) // I - Password callback data, if any
|
||||
{
|
||||
bool done = false; // Are we done?
|
||||
char line[1024], // Line from file
|
||||
@ -1404,7 +1493,7 @@ load_xref(pdfio_file_t *pdf, // I - PDF file
|
||||
|
||||
_pdfioTokenInit(&tb, pdf, (_pdfio_tconsume_cb_t)_pdfioFileConsume, (_pdfio_tpeek_cb_t)_pdfioFilePeek, pdf);
|
||||
|
||||
if (!_pdfioValueRead(pdf, &tb, &trailer))
|
||||
if (!_pdfioValueRead(pdf, obj, &tb, &trailer))
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to read cross-reference stream dictionary.");
|
||||
return (false);
|
||||
@ -1414,12 +1503,6 @@ load_xref(pdfio_file_t *pdf, // I - PDF file
|
||||
_pdfioFileError(pdf, "Cross-reference stream does not have a dictionary.");
|
||||
return (false);
|
||||
}
|
||||
else if (_pdfioDictGetValue(pdf->trailer, "Encrypt"))
|
||||
{
|
||||
// Encryption not yet supported...
|
||||
_pdfioFileError(pdf, "Sorry, PDFio currently does not support encrypted PDF files.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
obj->value = trailer;
|
||||
|
||||
@ -1554,6 +1637,20 @@ load_xref(pdfio_file_t *pdf, // I - PDF file
|
||||
|
||||
pdfioStreamClose(st);
|
||||
|
||||
if (!pdf->trailer_dict)
|
||||
{
|
||||
// Save the trailer dictionary and grab the root (catalog) and info
|
||||
// objects...
|
||||
pdf->trailer_dict = trailer.value.dict;
|
||||
pdf->info_obj = pdfioDictGetObj(pdf->trailer_dict, "Info");
|
||||
pdf->encrypt_obj = pdfioDictGetObj(pdf->trailer_dict, "Encrypt");
|
||||
pdf->id_array = pdfioDictGetArray(pdf->trailer_dict, "ID");
|
||||
|
||||
// If the trailer contains an Encrypt key, try unlocking the file...
|
||||
if (pdf->encrypt_obj && !_pdfioCryptoUnlock(pdf, password_cb, password_data))
|
||||
return (false);
|
||||
}
|
||||
|
||||
// Load any object streams that are left...
|
||||
PDFIO_DEBUG("load_xref: %lu compressed object streams to load.\n", (unsigned long)num_sobjs);
|
||||
|
||||
@ -1651,7 +1748,7 @@ load_xref(pdfio_file_t *pdf, // I - PDF file
|
||||
|
||||
_pdfioTokenInit(&tb, pdf, (_pdfio_tconsume_cb_t)_pdfioFileConsume, (_pdfio_tpeek_cb_t)_pdfioFilePeek, pdf);
|
||||
|
||||
if (!_pdfioValueRead(pdf, &tb, &trailer))
|
||||
if (!_pdfioValueRead(pdf, NULL, &tb, &trailer))
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to read trailer dictionary.");
|
||||
return (false);
|
||||
@ -1661,14 +1758,22 @@ load_xref(pdfio_file_t *pdf, // I - PDF file
|
||||
_pdfioFileError(pdf, "Trailer is not a dictionary.");
|
||||
return (false);
|
||||
}
|
||||
else if (_pdfioDictGetValue(pdf->trailer, "Encrypt"))
|
||||
{
|
||||
// Encryption not yet supported...
|
||||
_pdfioFileError(pdf, "Sorry, PDFio currently does not support encrypted PDF files.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
_pdfioTokenFlush(&tb);
|
||||
|
||||
if (!pdf->trailer_dict)
|
||||
{
|
||||
// Save the trailer dictionary and grab the root (catalog) and info
|
||||
// objects...
|
||||
pdf->trailer_dict = trailer.value.dict;
|
||||
pdf->info_obj = pdfioDictGetObj(pdf->trailer_dict, "Info");
|
||||
pdf->encrypt_obj = pdfioDictGetObj(pdf->trailer_dict, "Encrypt");
|
||||
pdf->id_array = pdfioDictGetArray(pdf->trailer_dict, "ID");
|
||||
|
||||
// If the trailer contains an Encrypt key, try unlocking the file...
|
||||
if (pdf->encrypt_obj && !_pdfioCryptoUnlock(pdf, password_cb, password_data))
|
||||
return (false);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -1681,32 +1786,21 @@ load_xref(pdfio_file_t *pdf, // I - PDF file
|
||||
PDFIO_DEBUG_VALUE(&trailer);
|
||||
PDFIO_DEBUG("\n");
|
||||
|
||||
if (!pdf->trailer)
|
||||
{
|
||||
// Save the trailer dictionary and grab the root (catalog) and info
|
||||
// objects...
|
||||
pdf->trailer = trailer.value.dict;
|
||||
}
|
||||
|
||||
if ((xref_offset = (off_t)pdfioDictGetNumber(trailer.value.dict, "Prev")) <= 0)
|
||||
done = true;
|
||||
}
|
||||
|
||||
// Once we have all of the xref tables loaded, get the important objects and
|
||||
// build the pages array...
|
||||
if ((pdf->root = pdfioDictGetObj(pdf->trailer, "Root")) == NULL)
|
||||
if ((pdf->root_obj = pdfioDictGetObj(pdf->trailer_dict, "Root")) == NULL)
|
||||
{
|
||||
_pdfioFileError(pdf, "Missing Root object.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
PDFIO_DEBUG("load_xref: Root=%p(%lu)\n", pdf->root, (unsigned long)pdf->root->number);
|
||||
PDFIO_DEBUG("load_xref: Root=%p(%lu)\n", pdf->root_obj, (unsigned long)pdf->root_obj->number);
|
||||
|
||||
pdf->info = pdfioDictGetObj(pdf->trailer, "Info");
|
||||
pdf->encrypt = pdfioDictGetObj(pdf->trailer, "Encrypt");
|
||||
pdf->id_array = pdfioDictGetArray(pdf->trailer, "ID");
|
||||
|
||||
return (load_pages(pdf, pdfioDictGetObj(pdfioObjGetDict(pdf->root), "Pages")));
|
||||
return (load_pages(pdf, pdfioDictGetObj(pdfioObjGetDict(pdf->root_obj), "Pages")));
|
||||
}
|
||||
|
||||
|
||||
@ -1724,13 +1818,13 @@ write_catalog(pdfio_file_t *pdf) // I - PDF file
|
||||
return (false);
|
||||
|
||||
pdfioDictSetName(dict, "Type", "Catalog");
|
||||
pdfioDictSetObj(dict, "Pages", pdf->pages_root);
|
||||
pdfioDictSetObj(dict, "Pages", pdf->pages_obj);
|
||||
// TODO: Add support for all of the root object dictionary keys
|
||||
|
||||
if ((pdf->root = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||||
if ((pdf->root_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||||
return (false);
|
||||
else
|
||||
return (pdfioObjClose(pdf->root));
|
||||
return (pdfioObjClose(pdf->root_obj));
|
||||
}
|
||||
|
||||
|
||||
@ -1752,11 +1846,11 @@ write_pages(pdfio_file_t *pdf) // I - PDF file
|
||||
for (i = 0; i < pdf->num_pages; i ++)
|
||||
pdfioArrayAppendObj(kids, pdf->pages[i]);
|
||||
|
||||
pdfioDictSetNumber(pdf->pages_root->value.value.dict, "Count", pdf->num_pages);
|
||||
pdfioDictSetArray(pdf->pages_root->value.value.dict, "Kids", kids);
|
||||
pdfioDictSetNumber(pdf->pages_obj->value.value.dict, "Count", pdf->num_pages);
|
||||
pdfioDictSetArray(pdf->pages_obj->value.value.dict, "Kids", kids);
|
||||
|
||||
// Write the Pages object...
|
||||
return (pdfioObjClose(pdf->pages_root));
|
||||
return (pdfioObjClose(pdf->pages_obj));
|
||||
}
|
||||
|
||||
|
||||
@ -1770,8 +1864,6 @@ write_trailer(pdfio_file_t *pdf) // I - PDF file
|
||||
bool ret = true; // Return value
|
||||
off_t xref_offset; // Offset to xref table
|
||||
size_t i; // Looping var
|
||||
int fd; // File for /dev/urandom
|
||||
unsigned char id_values[2][16]; // ID array values
|
||||
|
||||
|
||||
// Write the xref table...
|
||||
@ -1805,34 +1897,22 @@ write_trailer(pdfio_file_t *pdf) // I - PDF file
|
||||
goto done;
|
||||
}
|
||||
|
||||
if ((fd = open("/dev/urandom", O_RDONLY)) >= 0)
|
||||
{
|
||||
// Load ID array with random values from /dev/urandom...
|
||||
if (read(fd, id_values[0], sizeof(id_values[0])) == (ssize_t)sizeof(id_values[0]) && read(fd, id_values[1], sizeof(id_values[1])) == (ssize_t)sizeof(id_values[1]))
|
||||
{
|
||||
pdf->id_array = pdfioArrayCreate(pdf);
|
||||
pdfioArrayAppendBinary(pdf->id_array, id_values[0], sizeof(id_values[0]));
|
||||
pdfioArrayAppendBinary(pdf->id_array, id_values[1], sizeof(id_values[1]));
|
||||
}
|
||||
|
||||
close(fd);
|
||||
}
|
||||
|
||||
if ((pdf->trailer = pdfioDictCreate(pdf)) == NULL)
|
||||
if ((pdf->trailer_dict = pdfioDictCreate(pdf)) == NULL)
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to create trailer.");
|
||||
ret = false;
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (pdf->encrypt)
|
||||
pdfioDictSetObj(pdf->trailer, "Encrypt", pdf->encrypt);
|
||||
if (pdf->encrypt_obj)
|
||||
pdfioDictSetObj(pdf->trailer_dict, "Encrypt", pdf->encrypt_obj);
|
||||
if (pdf->id_array)
|
||||
pdfioDictSetArray(pdf->trailer, "ID", pdf->id_array);
|
||||
pdfioDictSetObj(pdf->trailer, "Info", pdf->info);
|
||||
pdfioDictSetObj(pdf->trailer, "Root", pdf->root);
|
||||
pdfioDictSetNumber(pdf->trailer, "Size", pdf->num_objs + 1);
|
||||
pdfioDictSetArray(pdf->trailer_dict, "ID", pdf->id_array);
|
||||
pdfioDictSetObj(pdf->trailer_dict, "Info", pdf->info_obj);
|
||||
pdfioDictSetObj(pdf->trailer_dict, "Root", pdf->root_obj);
|
||||
pdfioDictSetNumber(pdf->trailer_dict, "Size", pdf->num_objs + 1);
|
||||
|
||||
if (!_pdfioDictWrite(pdf->trailer, NULL))
|
||||
if (!_pdfioDictWrite(pdf->trailer_dict, NULL, NULL))
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to write trailer.");
|
||||
ret = false;
|
||||
|
||||
338
pdfio-md5.c
Normal file
338
pdfio-md5.c
Normal file
@ -0,0 +1,338 @@
|
||||
//
|
||||
// MD5 functions for PDFio.
|
||||
//
|
||||
// Copyright © 2021 by Michael R Sweet.
|
||||
// Copyright © 1999 Aladdin Enterprises. All rights reserved.
|
||||
//
|
||||
// This software is provided 'as-is', without any express or implied
|
||||
// warranty. In no event will the authors be held liable for any damages
|
||||
// arising from the use of this software.
|
||||
//
|
||||
// Permission is granted to anyone to use this software for any purpose,
|
||||
// including commercial applications, and to alter it and redistribute it
|
||||
// freely, subject to the following restrictions:
|
||||
//
|
||||
// 1. The origin of this software must not be misrepresented; you must not
|
||||
// claim that you wrote the original software. If you use this software
|
||||
// in a product, an acknowledgment in the product documentation would be
|
||||
// appreciated but is not required.
|
||||
// 2. Altered source versions must be plainly marked as such, and must not be
|
||||
// misrepresented as being the original software.
|
||||
// 3. This notice may not be removed or altered from any source distribution.
|
||||
//
|
||||
// L. Peter Deutsch
|
||||
// ghost@aladdin.com
|
||||
//
|
||||
|
||||
#include "pdfio-private.h"
|
||||
|
||||
|
||||
/*
|
||||
Independent implementation of MD5 (RFC 1321).
|
||||
|
||||
This code implements the MD5 Algorithm defined in RFC 1321.
|
||||
It is derived directly from the text of the RFC and not from the
|
||||
reference implementation.
|
||||
|
||||
The original and principal author of md5.c is L. Peter Deutsch
|
||||
<ghost@aladdin.com>. Other authors are noted in the change history
|
||||
that follows (in reverse chronological order):
|
||||
|
||||
1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
|
||||
1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5).
|
||||
1999-05-03 lpd Original version.
|
||||
*/
|
||||
|
||||
#define T1 0xd76aa478
|
||||
#define T2 0xe8c7b756
|
||||
#define T3 0x242070db
|
||||
#define T4 0xc1bdceee
|
||||
#define T5 0xf57c0faf
|
||||
#define T6 0x4787c62a
|
||||
#define T7 0xa8304613
|
||||
#define T8 0xfd469501
|
||||
#define T9 0x698098d8
|
||||
#define T10 0x8b44f7af
|
||||
#define T11 0xffff5bb1
|
||||
#define T12 0x895cd7be
|
||||
#define T13 0x6b901122
|
||||
#define T14 0xfd987193
|
||||
#define T15 0xa679438e
|
||||
#define T16 0x49b40821
|
||||
#define T17 0xf61e2562
|
||||
#define T18 0xc040b340
|
||||
#define T19 0x265e5a51
|
||||
#define T20 0xe9b6c7aa
|
||||
#define T21 0xd62f105d
|
||||
#define T22 0x02441453
|
||||
#define T23 0xd8a1e681
|
||||
#define T24 0xe7d3fbc8
|
||||
#define T25 0x21e1cde6
|
||||
#define T26 0xc33707d6
|
||||
#define T27 0xf4d50d87
|
||||
#define T28 0x455a14ed
|
||||
#define T29 0xa9e3e905
|
||||
#define T30 0xfcefa3f8
|
||||
#define T31 0x676f02d9
|
||||
#define T32 0x8d2a4c8a
|
||||
#define T33 0xfffa3942
|
||||
#define T34 0x8771f681
|
||||
#define T35 0x6d9d6122
|
||||
#define T36 0xfde5380c
|
||||
#define T37 0xa4beea44
|
||||
#define T38 0x4bdecfa9
|
||||
#define T39 0xf6bb4b60
|
||||
#define T40 0xbebfbc70
|
||||
#define T41 0x289b7ec6
|
||||
#define T42 0xeaa127fa
|
||||
#define T43 0xd4ef3085
|
||||
#define T44 0x04881d05
|
||||
#define T45 0xd9d4d039
|
||||
#define T46 0xe6db99e5
|
||||
#define T47 0x1fa27cf8
|
||||
#define T48 0xc4ac5665
|
||||
#define T49 0xf4292244
|
||||
#define T50 0x432aff97
|
||||
#define T51 0xab9423a7
|
||||
#define T52 0xfc93a039
|
||||
#define T53 0x655b59c3
|
||||
#define T54 0x8f0ccc92
|
||||
#define T55 0xffeff47d
|
||||
#define T56 0x85845dd1
|
||||
#define T57 0x6fa87e4f
|
||||
#define T58 0xfe2ce6e0
|
||||
#define T59 0xa3014314
|
||||
#define T60 0x4e0811a1
|
||||
#define T61 0xf7537e82
|
||||
#define T62 0xbd3af235
|
||||
#define T63 0x2ad7d2bb
|
||||
#define T64 0xeb86d391
|
||||
|
||||
static void
|
||||
md5_process(_pdfio_md5_t *pms, const uint8_t *data /*[64]*/)
|
||||
{
|
||||
uint32_t
|
||||
a = pms->abcd[0], b = pms->abcd[1],
|
||||
c = pms->abcd[2], d = pms->abcd[3];
|
||||
uint32_t t;
|
||||
|
||||
#ifndef ARCH_IS_BIG_ENDIAN
|
||||
# define ARCH_IS_BIG_ENDIAN 1 /* slower, default implementation */
|
||||
#endif
|
||||
#if ARCH_IS_BIG_ENDIAN
|
||||
|
||||
/*
|
||||
* On big-endian machines, we must arrange the bytes in the right
|
||||
* order. (This also works on machines of unknown byte order.)
|
||||
*/
|
||||
uint32_t X[16];
|
||||
const uint8_t *xp = data;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 16; ++i, xp += 4)
|
||||
X[i] = xp[0] + (unsigned)(xp[1] << 8) + (unsigned)(xp[2] << 16) + (unsigned)(xp[3] << 24);
|
||||
|
||||
#else /* !ARCH_IS_BIG_ENDIAN */
|
||||
|
||||
/*
|
||||
* On little-endian machines, we can process properly aligned data
|
||||
* without copying it.
|
||||
*/
|
||||
uint32_t xbuf[16];
|
||||
const uint32_t *X;
|
||||
|
||||
if (!((data - (const uint8_t *)0) & 3)) {
|
||||
/* data are properly aligned */
|
||||
X = (const uint32_t *)data;
|
||||
} else {
|
||||
/* not aligned */
|
||||
memcpy(xbuf, data, 64);
|
||||
X = xbuf;
|
||||
}
|
||||
#endif
|
||||
|
||||
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
|
||||
|
||||
/* Round 1. */
|
||||
/* Let [abcd k s i] denote the operation
|
||||
a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
|
||||
#define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
|
||||
#define SET(a, b, c, d, k, s, Ti)\
|
||||
t = a + F(b,c,d) + X[k] + Ti;\
|
||||
a = ROTATE_LEFT(t, s) + b
|
||||
/* Do the following 16 operations. */
|
||||
SET(a, b, c, d, 0, 7, T1);
|
||||
SET(d, a, b, c, 1, 12, T2);
|
||||
SET(c, d, a, b, 2, 17, T3);
|
||||
SET(b, c, d, a, 3, 22, T4);
|
||||
SET(a, b, c, d, 4, 7, T5);
|
||||
SET(d, a, b, c, 5, 12, T6);
|
||||
SET(c, d, a, b, 6, 17, T7);
|
||||
SET(b, c, d, a, 7, 22, T8);
|
||||
SET(a, b, c, d, 8, 7, T9);
|
||||
SET(d, a, b, c, 9, 12, T10);
|
||||
SET(c, d, a, b, 10, 17, T11);
|
||||
SET(b, c, d, a, 11, 22, T12);
|
||||
SET(a, b, c, d, 12, 7, T13);
|
||||
SET(d, a, b, c, 13, 12, T14);
|
||||
SET(c, d, a, b, 14, 17, T15);
|
||||
SET(b, c, d, a, 15, 22, T16);
|
||||
#undef SET
|
||||
|
||||
/* Round 2. */
|
||||
/* Let [abcd k s i] denote the operation
|
||||
a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
|
||||
#define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
|
||||
#define SET(a, b, c, d, k, s, Ti)\
|
||||
t = a + G(b,c,d) + X[k] + Ti;\
|
||||
a = ROTATE_LEFT(t, s) + b
|
||||
/* Do the following 16 operations. */
|
||||
SET(a, b, c, d, 1, 5, T17);
|
||||
SET(d, a, b, c, 6, 9, T18);
|
||||
SET(c, d, a, b, 11, 14, T19);
|
||||
SET(b, c, d, a, 0, 20, T20);
|
||||
SET(a, b, c, d, 5, 5, T21);
|
||||
SET(d, a, b, c, 10, 9, T22);
|
||||
SET(c, d, a, b, 15, 14, T23);
|
||||
SET(b, c, d, a, 4, 20, T24);
|
||||
SET(a, b, c, d, 9, 5, T25);
|
||||
SET(d, a, b, c, 14, 9, T26);
|
||||
SET(c, d, a, b, 3, 14, T27);
|
||||
SET(b, c, d, a, 8, 20, T28);
|
||||
SET(a, b, c, d, 13, 5, T29);
|
||||
SET(d, a, b, c, 2, 9, T30);
|
||||
SET(c, d, a, b, 7, 14, T31);
|
||||
SET(b, c, d, a, 12, 20, T32);
|
||||
#undef SET
|
||||
|
||||
/* Round 3. */
|
||||
/* Let [abcd k s t] denote the operation
|
||||
a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
|
||||
#define H(x, y, z) ((x) ^ (y) ^ (z))
|
||||
#define SET(a, b, c, d, k, s, Ti)\
|
||||
t = a + H(b,c,d) + X[k] + Ti;\
|
||||
a = ROTATE_LEFT(t, s) + b
|
||||
/* Do the following 16 operations. */
|
||||
SET(a, b, c, d, 5, 4, T33);
|
||||
SET(d, a, b, c, 8, 11, T34);
|
||||
SET(c, d, a, b, 11, 16, T35);
|
||||
SET(b, c, d, a, 14, 23, T36);
|
||||
SET(a, b, c, d, 1, 4, T37);
|
||||
SET(d, a, b, c, 4, 11, T38);
|
||||
SET(c, d, a, b, 7, 16, T39);
|
||||
SET(b, c, d, a, 10, 23, T40);
|
||||
SET(a, b, c, d, 13, 4, T41);
|
||||
SET(d, a, b, c, 0, 11, T42);
|
||||
SET(c, d, a, b, 3, 16, T43);
|
||||
SET(b, c, d, a, 6, 23, T44);
|
||||
SET(a, b, c, d, 9, 4, T45);
|
||||
SET(d, a, b, c, 12, 11, T46);
|
||||
SET(c, d, a, b, 15, 16, T47);
|
||||
SET(b, c, d, a, 2, 23, T48);
|
||||
#undef SET
|
||||
|
||||
/* Round 4. */
|
||||
/* Let [abcd k s t] denote the operation
|
||||
a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
|
||||
#define I(x, y, z) ((y) ^ ((x) | ~(z)))
|
||||
#define SET(a, b, c, d, k, s, Ti)\
|
||||
t = a + I(b,c,d) + X[k] + Ti;\
|
||||
a = ROTATE_LEFT(t, s) + b
|
||||
/* Do the following 16 operations. */
|
||||
SET(a, b, c, d, 0, 6, T49);
|
||||
SET(d, a, b, c, 7, 10, T50);
|
||||
SET(c, d, a, b, 14, 15, T51);
|
||||
SET(b, c, d, a, 5, 21, T52);
|
||||
SET(a, b, c, d, 12, 6, T53);
|
||||
SET(d, a, b, c, 3, 10, T54);
|
||||
SET(c, d, a, b, 10, 15, T55);
|
||||
SET(b, c, d, a, 1, 21, T56);
|
||||
SET(a, b, c, d, 8, 6, T57);
|
||||
SET(d, a, b, c, 15, 10, T58);
|
||||
SET(c, d, a, b, 6, 15, T59);
|
||||
SET(b, c, d, a, 13, 21, T60);
|
||||
SET(a, b, c, d, 4, 6, T61);
|
||||
SET(d, a, b, c, 11, 10, T62);
|
||||
SET(c, d, a, b, 2, 15, T63);
|
||||
SET(b, c, d, a, 9, 21, T64);
|
||||
#undef SET
|
||||
|
||||
/* Then perform the following additions. (That is increment each
|
||||
of the four registers by the value it had before this block
|
||||
was started.) */
|
||||
pms->abcd[0] += a;
|
||||
pms->abcd[1] += b;
|
||||
pms->abcd[2] += c;
|
||||
pms->abcd[3] += d;
|
||||
}
|
||||
|
||||
void
|
||||
_pdfioCryptoMD5Init(_pdfio_md5_t *pms)
|
||||
{
|
||||
pms->count[0] = pms->count[1] = 0;
|
||||
pms->abcd[0] = 0x67452301;
|
||||
pms->abcd[1] = 0xefcdab89;
|
||||
pms->abcd[2] = 0x98badcfe;
|
||||
pms->abcd[3] = 0x10325476;
|
||||
}
|
||||
|
||||
void
|
||||
_pdfioCryptoMD5Append(_pdfio_md5_t *pms, const uint8_t *data, size_t nbytes)
|
||||
{
|
||||
const uint8_t *p = data;
|
||||
size_t left = nbytes;
|
||||
size_t offset = (pms->count[0] >> 3) & 63;
|
||||
uint32_t nbits = (uint32_t)(nbytes << 3);
|
||||
|
||||
if (nbytes == 0)
|
||||
return;
|
||||
|
||||
/* Update the message length. */
|
||||
pms->count[1] += (unsigned)(nbytes >> 29);
|
||||
pms->count[0] += nbits;
|
||||
if (pms->count[0] < nbits)
|
||||
pms->count[1]++;
|
||||
|
||||
/* Process an initial partial block. */
|
||||
if (offset) {
|
||||
size_t copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
|
||||
|
||||
memcpy(pms->buf + offset, p, copy);
|
||||
if (offset + copy < 64)
|
||||
return;
|
||||
p += copy;
|
||||
left -= copy;
|
||||
md5_process(pms, pms->buf);
|
||||
}
|
||||
|
||||
/* Process full blocks. */
|
||||
for (; left >= 64; p += 64, left -= 64)
|
||||
md5_process(pms, p);
|
||||
|
||||
/* Process a final partial block. */
|
||||
if (left)
|
||||
memcpy(pms->buf, p, left);
|
||||
}
|
||||
|
||||
void
|
||||
_pdfioCryptoMD5Finish(_pdfio_md5_t *pms, uint8_t digest[16])
|
||||
{
|
||||
static const uint8_t pad[64] = {
|
||||
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
||||
};
|
||||
uint8_t data[8];
|
||||
int i;
|
||||
|
||||
/* Save the length before padding. */
|
||||
for (i = 0; i < 8; ++i)
|
||||
data[i] = (uint8_t)(pms->count[i >> 2] >> ((i & 3) << 3));
|
||||
/* Pad to 56 bytes mod 64. */
|
||||
_pdfioCryptoMD5Append(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1);
|
||||
/* Append the length. */
|
||||
_pdfioCryptoMD5Append(pms, data, 8);
|
||||
for (i = 0; i < 16; ++i)
|
||||
digest[i] = (uint8_t)(pms->abcd[i >> 2] >> ((i & 3) << 3));
|
||||
}
|
||||
@ -96,6 +96,9 @@ pdfioObjCopy(pdfio_file_t *pdf, // I - PDF file
|
||||
if (!_pdfioValueCopy(pdf, &dstobj->value, srcobj->pdf, &srcobj->value))
|
||||
return (NULL);
|
||||
|
||||
if (dstobj->value.type == PDFIO_VALTYPE_DICT)
|
||||
_pdfioDictClear(dstobj->value.value.dict, "Length");
|
||||
|
||||
if (srcobj->stream_offset)
|
||||
{
|
||||
// Copy stream data...
|
||||
@ -409,7 +412,7 @@ _pdfioObjLoad(pdfio_obj_t *obj) // I - Object
|
||||
// Then grab the object value...
|
||||
_pdfioTokenInit(&tb, obj->pdf, (_pdfio_tconsume_cb_t)_pdfioFileConsume, (_pdfio_tpeek_cb_t)_pdfioFilePeek, obj->pdf);
|
||||
|
||||
if (!_pdfioValueRead(obj->pdf, &tb, &obj->value))
|
||||
if (!_pdfioValueRead(obj->pdf, obj, &tb, &obj->value))
|
||||
{
|
||||
_pdfioFileError(obj->pdf, "Unable to read value for object %lu.", (unsigned long)obj->number);
|
||||
return (false);
|
||||
@ -479,7 +482,7 @@ write_obj_header(pdfio_obj_t *obj) // I - Object
|
||||
if (!_pdfioFilePrintf(obj->pdf, "%lu %u obj\n", (unsigned long)obj->number, obj->generation))
|
||||
return (false);
|
||||
|
||||
if (!_pdfioValueWrite(obj->pdf, &obj->value, &obj->length_offset))
|
||||
if (!_pdfioValueWrite(obj->pdf, obj, &obj->value, &obj->length_offset))
|
||||
return (false);
|
||||
|
||||
return (_pdfioFilePuts(obj->pdf, "\n"));
|
||||
|
||||
@ -24,6 +24,7 @@
|
||||
|
||||
# include "pdfio.h"
|
||||
# include <stdarg.h>
|
||||
# include <stdint.h>
|
||||
# include <string.h>
|
||||
# include <errno.h>
|
||||
# include <inttypes.h>
|
||||
@ -174,6 +175,44 @@ typedef struct _pdfio_value_s // Value structure
|
||||
} value; // Value union
|
||||
} _pdfio_value_t;
|
||||
|
||||
typedef struct _pdfio_aes_s // AES encryption state
|
||||
{
|
||||
size_t round_size; // Size of round key
|
||||
uint8_t round_key[240], // Round key
|
||||
iv[16]; // Initialization vector
|
||||
} _pdfio_aes_t;
|
||||
|
||||
typedef struct _pdfio_md5_s // MD5 hash state
|
||||
{
|
||||
uint32_t count[2]; // Message length in bits, lsw first
|
||||
uint32_t abcd[4]; // Digest buffer
|
||||
uint8_t buf[64]; // Accumulate block
|
||||
} _pdfio_md5_t;
|
||||
|
||||
typedef struct _pdfio_rc4_s // RC4 encryption state
|
||||
{
|
||||
uint8_t sbox[256]; // S boxes for encryption
|
||||
uint8_t i, j; // Current indices into S boxes
|
||||
} _pdfio_rc4_t;
|
||||
|
||||
typedef struct _pdfio_sha265_s // SHA-256 hash state
|
||||
{
|
||||
uint32_t Intermediate_Hash[8]; // Message Digest
|
||||
uint32_t Length_High; // Message length in bits
|
||||
uint32_t Length_Low; // Message length in bits
|
||||
int Message_Block_Index; // Message_Block array index
|
||||
uint8_t Message_Block[64]; // 512-bit message blocks
|
||||
int Computed; // Is the hash computed?
|
||||
int Corrupted; // Cumulative corruption code
|
||||
} _pdfio_sha256_t;
|
||||
|
||||
typedef union _pdfio_crypto_ctx_u // Cryptographic contexts
|
||||
{
|
||||
_pdfio_aes_t aes; // AES-128/256 context
|
||||
_pdfio_rc4_t rc4; // RC4-40/128 context
|
||||
} _pdfio_crypto_ctx_t;
|
||||
typedef size_t (*_pdfio_crypto_cb_t)(_pdfio_crypto_ctx_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len);
|
||||
|
||||
struct _pdfio_array_s
|
||||
{
|
||||
pdfio_file_t *pdf; // PDF file
|
||||
@ -215,17 +254,26 @@ struct _pdfio_file_s // PDF file structure
|
||||
pdfio_error_cb_t error_cb; // Error callback
|
||||
void *error_data; // Data for error callback
|
||||
|
||||
pdfio_encryption_t encryption; // Encryption mode
|
||||
pdfio_permission_t permissions; // Access permissions (encrypted PDF files)
|
||||
uint8_t file_key[16], // File encryption key
|
||||
owner_key[32], // Owner encryption key
|
||||
user_key[32]; // User encryption key
|
||||
size_t file_keylen, // Length of file encryption key
|
||||
owner_keylen, // Length of owner encryption key
|
||||
user_keylen; // Length of user encryption key
|
||||
|
||||
// Active file data
|
||||
int fd; // File descriptor
|
||||
char buffer[8192], // Read/write buffer
|
||||
*bufptr, // Pointer into buffer
|
||||
*bufend; // End of buffer
|
||||
off_t bufpos; // Position in file for start of buffer
|
||||
pdfio_dict_t *trailer; // Trailer dictionary
|
||||
pdfio_obj_t *root; // Root object/dictionary
|
||||
pdfio_obj_t *info; // Information object
|
||||
pdfio_obj_t *pages_root; // Root pages object
|
||||
pdfio_obj_t *encrypt; // Encryption object/dictionary
|
||||
pdfio_dict_t *trailer_dict; // Trailer dictionary
|
||||
pdfio_obj_t *root_obj; // Root object/dictionary
|
||||
pdfio_obj_t *info_obj; // Information object
|
||||
pdfio_obj_t *pages_obj; // Root pages object
|
||||
pdfio_obj_t *encrypt_obj; // De/Encryption object/dictionary
|
||||
pdfio_obj_t *cp1252_obj, // CP1252 font encoding object
|
||||
*unicode_obj; // Unicode font encoding object
|
||||
pdfio_array_t *id_array; // ID array
|
||||
@ -281,6 +329,8 @@ struct _pdfio_stream_s // Stream
|
||||
unsigned char cbuffer[4096], // Compressed data buffer
|
||||
*prbuffer, // Raw buffer (previous line), as needed
|
||||
*psbuffer; // PNG filter buffer, as needed
|
||||
_pdfio_crypto_cb_t crypto_cb; // Encryption/descryption callback, if any
|
||||
_pdfio_crypto_ctx_t crypto_ctx; // Cryptographic context
|
||||
};
|
||||
|
||||
|
||||
@ -291,15 +341,33 @@ struct _pdfio_stream_s // Stream
|
||||
extern void _pdfioArrayDebug(pdfio_array_t *a, FILE *fp) _PDFIO_INTERNAL;
|
||||
extern void _pdfioArrayDelete(pdfio_array_t *a) _PDFIO_INTERNAL;
|
||||
extern _pdfio_value_t *_pdfioArrayGetValue(pdfio_array_t *a, size_t n) _PDFIO_INTERNAL;
|
||||
extern pdfio_array_t *_pdfioArrayRead(pdfio_file_t *pdf, _pdfio_token_t *ts) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioArrayWrite(pdfio_array_t *a) _PDFIO_INTERNAL;
|
||||
extern pdfio_array_t *_pdfioArrayRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioArrayWrite(pdfio_array_t *a, pdfio_obj_t *obj) _PDFIO_INTERNAL;
|
||||
|
||||
extern void _pdfioCryptoAESInit(_pdfio_aes_t *ctx, const uint8_t *key, size_t keylen, const uint8_t *iv) _PDFIO_INTERNAL;
|
||||
extern size_t _pdfioCryptoAESDecrypt(_pdfio_aes_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL;
|
||||
extern size_t _pdfioCryptoAESEncrypt(_pdfio_aes_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioCryptoLock(pdfio_file_t *pdf, pdfio_permission_t permissions, pdfio_encryption_t encryption, const char *owner_password, const char *user_password) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoMakeRandom(uint8_t *buffer, size_t bytes) _PDFIO_INTERNAL;
|
||||
extern _pdfio_crypto_cb_t _pdfioCryptoMakeReader(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_crypto_ctx_t *ctx, uint8_t *iv, size_t *ivlen) _PDFIO_INTERNAL;
|
||||
extern _pdfio_crypto_cb_t _pdfioCryptoMakeWriter(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_crypto_ctx_t *ctx, uint8_t *iv, size_t *ivlen) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoMD5Append(_pdfio_md5_t *pms, const uint8_t *data, size_t nbytes) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoMD5Finish(_pdfio_md5_t *pms, uint8_t digest[16]) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoMD5Init(_pdfio_md5_t *pms) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoRC4Init(_pdfio_rc4_t *ctx, const uint8_t *key, size_t keylen) _PDFIO_INTERNAL;
|
||||
extern size_t _pdfioCryptoRC4Crypt(_pdfio_rc4_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoSHA256Append(_pdfio_sha256_t *, const uint8_t *bytes, size_t bytecount) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoSHA256Init(_pdfio_sha256_t *ctx) _PDFIO_INTERNAL;
|
||||
extern void _pdfioCryptoSHA256Finish(_pdfio_sha256_t *ctx, uint8_t *Message_Digest) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioCryptoUnlock(pdfio_file_t *pdf, pdfio_password_cb_t password_cb, void *password_data) _PDFIO_INTERNAL;
|
||||
|
||||
extern void _pdfioDictClear(pdfio_dict_t *dict, const char *key) _PDFIO_INTERNAL;
|
||||
extern void _pdfioDictDebug(pdfio_dict_t *dict, FILE *fp) _PDFIO_INTERNAL;
|
||||
extern void _pdfioDictDelete(pdfio_dict_t *dict) _PDFIO_INTERNAL;
|
||||
extern _pdfio_value_t *_pdfioDictGetValue(pdfio_dict_t *dict, const char *key) _PDFIO_INTERNAL;
|
||||
extern pdfio_dict_t *_pdfioDictRead(pdfio_file_t *pdf, _pdfio_token_t *ts) _PDFIO_INTERNAL;
|
||||
extern pdfio_dict_t *_pdfioDictRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioDictSetValue(pdfio_dict_t *dict, const char *key, _pdfio_value_t *value) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioDictWrite(pdfio_dict_t *dict, off_t *length) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioDictWrite(pdfio_dict_t *dict, pdfio_obj_t *obj, off_t *length) _PDFIO_INTERNAL;
|
||||
|
||||
extern bool _pdfioFileAddMappedObj(pdfio_file_t *pdf, pdfio_obj_t *dst_obj, pdfio_obj_t *src_obj) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioFileAddPage(pdfio_file_t *pdf, pdfio_obj_t *obj) _PDFIO_INTERNAL;
|
||||
@ -337,7 +405,7 @@ extern bool _pdfioTokenRead(_pdfio_token_t *tb, char *buffer, size_t bufsize);
|
||||
extern _pdfio_value_t *_pdfioValueCopy(pdfio_file_t *pdfdst, _pdfio_value_t *vdst, pdfio_file_t *pdfsrc, _pdfio_value_t *vsrc) _PDFIO_INTERNAL;
|
||||
extern void _pdfioValueDebug(_pdfio_value_t *v, FILE *fp) _PDFIO_INTERNAL;
|
||||
extern void _pdfioValueDelete(_pdfio_value_t *v) _PDFIO_INTERNAL;
|
||||
extern _pdfio_value_t *_pdfioValueRead(pdfio_file_t *pdf, _pdfio_token_t *ts, _pdfio_value_t *v) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioValueWrite(pdfio_file_t *pdf, _pdfio_value_t *v, off_t *length) _PDFIO_INTERNAL;
|
||||
extern _pdfio_value_t *_pdfioValueRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts, _pdfio_value_t *v) _PDFIO_INTERNAL;
|
||||
extern bool _pdfioValueWrite(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_value_t *v, off_t *length) _PDFIO_INTERNAL;
|
||||
|
||||
#endif // !PDFIO_PRIVATE_H
|
||||
|
||||
113
pdfio-rc4.c
Normal file
113
pdfio-rc4.c
Normal file
@ -0,0 +1,113 @@
|
||||
//
|
||||
// RC4 functions for PDFio.
|
||||
//
|
||||
// Copyright © 2021 by Michael R Sweet.
|
||||
//
|
||||
// Original code by Tim Martin
|
||||
// Copyright © 1999 by Carnegie Mellon University, All Rights Reserved
|
||||
//
|
||||
// Permission to use, copy, modify, and distribute this software and its
|
||||
// documentation for any purpose and without fee is hereby granted,
|
||||
// provided that the above copyright notice appear in all copies and that
|
||||
// both that copyright notice and this permission notice appear in
|
||||
// supporting documentation, and that the name of Carnegie Mellon
|
||||
// University not be used in advertising or publicity pertaining to
|
||||
// distribution of the software without specific, written prior
|
||||
// permission.
|
||||
//
|
||||
// CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
|
||||
// THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
||||
// FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR
|
||||
// ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
|
||||
// OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
//
|
||||
|
||||
#include "pdfio-private.h"
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoRC4Init()' - Initialize an RC4 context with the specified key.
|
||||
//
|
||||
|
||||
void
|
||||
_pdfioCryptoRC4Init(
|
||||
_pdfio_rc4_t *ctx, // IO - Context
|
||||
const uint8_t *key, // I - Key
|
||||
size_t keylen) // I - Length of key
|
||||
{
|
||||
size_t i; // Looping var
|
||||
uint8_t j, // S box counter
|
||||
tmp; // Temporary variable
|
||||
|
||||
|
||||
// Fill in linearly s0=0, s1=1, ...
|
||||
for (i = 0; i < 256; i ++)
|
||||
ctx->sbox[i] = (uint8_t)i;
|
||||
|
||||
for (i = 0, j = 0; i < 256; i ++)
|
||||
{
|
||||
// j = (j + Si + Ki) mod 256
|
||||
j += ctx->sbox[i] + key[i % keylen];
|
||||
|
||||
// Swap Si and Sj...
|
||||
tmp = ctx->sbox[i];
|
||||
ctx->sbox[i] = ctx->sbox[j];
|
||||
ctx->sbox[j] = tmp;
|
||||
}
|
||||
|
||||
// Initialize counters to 0 and return...
|
||||
ctx->i = 0;
|
||||
ctx->j = 0;
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// '_pdfioCryptoRC4Crypt()' - De/encrypt the given buffer.
|
||||
//
|
||||
// "inbuffer" and "outbuffer" can point to the same memory.
|
||||
//
|
||||
|
||||
size_t // O - Number of output bytes
|
||||
_pdfioCryptoRC4Crypt(
|
||||
_pdfio_rc4_t *ctx, // I - Context
|
||||
uint8_t *outbuffer, // I - Output buffer
|
||||
const uint8_t *inbuffer, // I - Input buffer
|
||||
size_t len) // I - Size of buffers
|
||||
{
|
||||
uint8_t tmp, // Swap variable
|
||||
i, j, // Looping vars
|
||||
t; // Current S box
|
||||
size_t outbytes = len; // Number of output bytes
|
||||
|
||||
|
||||
// Loop through the entire buffer...
|
||||
i = ctx->i;
|
||||
j = ctx->j;
|
||||
|
||||
while (len > 0)
|
||||
{
|
||||
// Get the next S box indices...
|
||||
i ++;
|
||||
j += ctx->sbox[i];
|
||||
|
||||
// Swap Si and Sj...
|
||||
tmp = ctx->sbox[i];
|
||||
ctx->sbox[i] = ctx->sbox[j];
|
||||
ctx->sbox[j] = tmp;
|
||||
|
||||
// Get the S box index for this byte...
|
||||
t = ctx->sbox[i] + ctx->sbox[j];
|
||||
|
||||
// Encrypt using the S box...
|
||||
*outbuffer++ = *inbuffer++ ^ ctx->sbox[t];
|
||||
len --;
|
||||
}
|
||||
|
||||
// Copy current S box indices back to context...
|
||||
ctx->i = i;
|
||||
ctx->j = j;
|
||||
|
||||
return (outbytes);
|
||||
}
|
||||
480
pdfio-sha256.c
Normal file
480
pdfio-sha256.c
Normal file
@ -0,0 +1,480 @@
|
||||
//
|
||||
// SHA-256 functions for PDFio.
|
||||
//
|
||||
// Copyright © 2021 by Michael R Sweet.
|
||||
// Copyright © 2011 IETF Trust and the persons identified as authors of the
|
||||
// code. All rights reserved.
|
||||
//
|
||||
// Redistribution and use in source and binary forms, with or
|
||||
// without modification, are permitted provided that the following
|
||||
// conditions are met:
|
||||
//
|
||||
// - Redistributions of source code must retain the above
|
||||
// copyright notice, this list of conditions and
|
||||
// the following disclaimer.
|
||||
//
|
||||
// - Redistributions in binary form must reproduce the above
|
||||
// copyright notice, this list of conditions and the following
|
||||
// disclaimer in the documentation and/or other materials provided
|
||||
// with the distribution.
|
||||
//
|
||||
// - Neither the name of Internet Society, IETF or IETF Trust, nor
|
||||
// the names of specific contributors, may be used to endorse or
|
||||
// promote products derived from this software without specific
|
||||
// prior written permission.
|
||||
//
|
||||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
|
||||
// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
||||
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
||||
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
||||
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
||||
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
//
|
||||
|
||||
/*
|
||||
* Description:
|
||||
* This file implements the Secure Hash Algorithms SHA-224 and
|
||||
* SHA-256 as defined in the U.S. National Institute of Standards
|
||||
* and Technology Federal Information Processing Standards
|
||||
* Publication (FIPS PUB) 180-3 published in October 2008
|
||||
* and formerly defined in its predecessors, FIPS PUB 180-1
|
||||
* and FIP PUB 180-2.
|
||||
*
|
||||
* A combined document showing all algorithms is available at
|
||||
* http://csrc.nist.gov/publications/fips/
|
||||
* fips180-3/fips180-3_final.pdf
|
||||
*
|
||||
* The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
|
||||
* message digests for a given data stream. It should take about
|
||||
* 2**n steps to find a message with the same digest as a given
|
||||
* message and 2**(n/2) to find any two messages with the same
|
||||
* digest, when n is the digest size in bits. Therefore, this
|
||||
* algorithm can serve as a means of providing a
|
||||
* "fingerprint" for a message.
|
||||
*
|
||||
* Portability Issues:
|
||||
* SHA-224 and SHA-256 are defined in terms of 32-bit "words".
|
||||
* This code uses <stdint.h> (included via "sha.h") to define 32-
|
||||
* and 8-bit unsigned integer types. If your C compiler does not
|
||||
* support 32-bit unsigned integers, this code is not
|
||||
* appropriate.
|
||||
*
|
||||
* Caveats:
|
||||
* SHA-224 and SHA-256 are designed to work with messages less
|
||||
* than 2^64 bits long. This implementation uses SHA224/256Input()
|
||||
* to hash the bits that are a multiple of the size of an 8-bit
|
||||
* octet, and then optionally uses SHA224/256FinalBits()
|
||||
* to hash the final few bits of the input.
|
||||
*/
|
||||
|
||||
#include "pdfio-private.h"
|
||||
|
||||
/* Constants from sha.h */
|
||||
enum {
|
||||
SHA256_Message_Block_Size = 64,
|
||||
SHA256HashSize = 32,
|
||||
SHA256HashSizeBits = 256
|
||||
};
|
||||
|
||||
enum {
|
||||
shaSuccess = 0,
|
||||
shaNull, /* Null pointer parameter */
|
||||
shaInputTooLong, /* input data too long */
|
||||
shaStateError, /* called Input after FinalBits or Result */
|
||||
shaBadParam /* passed a bad parameter */
|
||||
};
|
||||
|
||||
/* Macros from sha-private.h */
|
||||
#define SHA_Ch(x, y, z) (((x) & ((y) ^ (z))) ^ (z))
|
||||
#define SHA_Maj(x, y, z) (((x) & ((y) | (z))) | ((y) & (z)))
|
||||
#define SHA_Parity(x, y, z) ((x) ^ (y) ^ (z))
|
||||
|
||||
/* Define the SHA shift, rotate left, and rotate right macros */
|
||||
#define SHA256_SHR(bits,word) ((word) >> (bits))
|
||||
#define SHA256_ROTL(bits,word) \
|
||||
(((word) << (bits)) | ((word) >> (32-(bits))))
|
||||
#define SHA256_ROTR(bits,word) \
|
||||
(((word) >> (bits)) | ((word) << (32-(bits))))
|
||||
|
||||
/* Define the SHA SIGMA and sigma macros */
|
||||
#define SHA256_SIGMA0(word) \
|
||||
(SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word))
|
||||
#define SHA256_SIGMA1(word) \
|
||||
(SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word))
|
||||
#define SHA256_sigma0(word) \
|
||||
(SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word))
|
||||
#define SHA256_sigma1(word) \
|
||||
(SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word))
|
||||
|
||||
/*
|
||||
* Add "length" to the length.
|
||||
* Set Corrupted when overflow has occurred.
|
||||
*/
|
||||
static uint32_t addTemp;
|
||||
#define SHA224_256AddLength(context, length) \
|
||||
(addTemp = (context)->Length_Low, (context)->Corrupted = \
|
||||
(((context)->Length_Low += (length)) < addTemp) && \
|
||||
(++(context)->Length_High == 0) ? shaInputTooLong : \
|
||||
(context)->Corrupted )
|
||||
|
||||
/* Local Function Prototypes */
|
||||
static int SHA224_256Reset(_pdfio_sha256_t *context, uint32_t *H0);
|
||||
static void SHA224_256ProcessMessageBlock(_pdfio_sha256_t *context);
|
||||
static void SHA224_256Finalize(_pdfio_sha256_t *context,
|
||||
uint8_t Pad_Byte);
|
||||
static void SHA224_256PadMessage(_pdfio_sha256_t *context,
|
||||
uint8_t Pad_Byte);
|
||||
static int SHA224_256ResultN(_pdfio_sha256_t *context,
|
||||
uint8_t Message_Digest[ ], int HashSize);
|
||||
|
||||
/* Initial Hash Values: FIPS 180-3 section 5.3.3 */
|
||||
static uint32_t SHA256_H0[SHA256HashSize/4] = {
|
||||
0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
|
||||
0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
|
||||
};
|
||||
|
||||
/*
|
||||
* _pdfioCryptoSHA256Init
|
||||
*
|
||||
* Description:
|
||||
* This function will initialize the _pdfio_sha256_t in preparation
|
||||
* for computing a new SHA256 message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
void _pdfioCryptoSHA256Init(_pdfio_sha256_t *context)
|
||||
{
|
||||
SHA224_256Reset(context, SHA256_H0);
|
||||
}
|
||||
|
||||
/*
|
||||
* _pdfioCryptoSHA256Append
|
||||
*
|
||||
* Description:
|
||||
* This function accepts an array of octets as the next portion
|
||||
* of the message.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* message_array[ ]: [in]
|
||||
* An array of octets representing the next portion of
|
||||
* the message.
|
||||
* length: [in]
|
||||
* The length of the message in message_array.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
void
|
||||
_pdfioCryptoSHA256Append(_pdfio_sha256_t *context, const uint8_t *message_array,
|
||||
size_t length)
|
||||
{
|
||||
if (!length) return;
|
||||
|
||||
while (length--) {
|
||||
context->Message_Block[context->Message_Block_Index++] =
|
||||
*message_array;
|
||||
|
||||
if ((SHA224_256AddLength(context, 8) == shaSuccess) &&
|
||||
(context->Message_Block_Index == SHA256_Message_Block_Size))
|
||||
SHA224_256ProcessMessageBlock(context);
|
||||
|
||||
message_array++;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* _pdfioCryptoSHA256Finish
|
||||
*
|
||||
* Description:
|
||||
* This function will return the 256-bit message digest
|
||||
* into the Message_Digest array provided by the caller.
|
||||
* NOTE:
|
||||
* The first octet of hash is stored in the element with index 0,
|
||||
* the last octet of hash in the element with index 31.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to use to calculate the SHA hash.
|
||||
* Message_Digest[ ]: [out]
|
||||
* Where the digest is returned.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
void
|
||||
_pdfioCryptoSHA256Finish(_pdfio_sha256_t *context,
|
||||
uint8_t Message_Digest[SHA256HashSize])
|
||||
{
|
||||
SHA224_256ResultN(context, Message_Digest, SHA256HashSize);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256Reset
|
||||
*
|
||||
* Description:
|
||||
* This helper function will initialize the _pdfio_sha256_t in
|
||||
* preparation for computing a new SHA-224 or SHA-256 message digest.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to reset.
|
||||
* H0[ ]: [in]
|
||||
* The initial hash value array to use.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
static int SHA224_256Reset(_pdfio_sha256_t *context, uint32_t *H0)
|
||||
{
|
||||
if (!context) return shaNull;
|
||||
|
||||
context->Length_High = context->Length_Low = 0;
|
||||
context->Message_Block_Index = 0;
|
||||
|
||||
context->Intermediate_Hash[0] = H0[0];
|
||||
context->Intermediate_Hash[1] = H0[1];
|
||||
context->Intermediate_Hash[2] = H0[2];
|
||||
context->Intermediate_Hash[3] = H0[3];
|
||||
context->Intermediate_Hash[4] = H0[4];
|
||||
context->Intermediate_Hash[5] = H0[5];
|
||||
context->Intermediate_Hash[6] = H0[6];
|
||||
context->Intermediate_Hash[7] = H0[7];
|
||||
|
||||
context->Computed = 0;
|
||||
context->Corrupted = shaSuccess;
|
||||
|
||||
return shaSuccess;
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256ProcessMessageBlock
|
||||
*
|
||||
* Description:
|
||||
* This helper function will process the next 512 bits of the
|
||||
* message stored in the Message_Block array.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
*
|
||||
* Returns:
|
||||
* Nothing.
|
||||
*
|
||||
* Comments:
|
||||
* Many of the variable names in this code, especially the
|
||||
* single character names, were used because those were the
|
||||
* names used in the Secure Hash Standard.
|
||||
*/
|
||||
static void SHA224_256ProcessMessageBlock(_pdfio_sha256_t *context)
|
||||
{
|
||||
/* Constants defined in FIPS 180-3, section 4.2.2 */
|
||||
static const uint32_t K[64] = {
|
||||
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
|
||||
0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
|
||||
0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
|
||||
0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
|
||||
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
|
||||
0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
|
||||
0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
|
||||
0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
|
||||
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
|
||||
0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
|
||||
0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
|
||||
0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
|
||||
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
|
||||
};
|
||||
int t, t4; /* Loop counter */
|
||||
uint32_t temp1, temp2; /* Temporary word value */
|
||||
uint32_t W[64]; /* Word sequence */
|
||||
uint32_t A, B, C, D, E, F, G, H; /* Word buffers */
|
||||
|
||||
/*
|
||||
* Initialize the first 16 words in the array W
|
||||
*/
|
||||
for (t = t4 = 0; t < 16; t++, t4 += 4)
|
||||
W[t] = (((uint32_t)context->Message_Block[t4]) << 24) |
|
||||
(((uint32_t)context->Message_Block[t4 + 1]) << 16) |
|
||||
(((uint32_t)context->Message_Block[t4 + 2]) << 8) |
|
||||
(((uint32_t)context->Message_Block[t4 + 3]));
|
||||
|
||||
for (t = 16; t < 64; t++)
|
||||
W[t] = SHA256_sigma1(W[t-2]) + W[t-7] +
|
||||
SHA256_sigma0(W[t-15]) + W[t-16];
|
||||
|
||||
A = context->Intermediate_Hash[0];
|
||||
B = context->Intermediate_Hash[1];
|
||||
C = context->Intermediate_Hash[2];
|
||||
D = context->Intermediate_Hash[3];
|
||||
E = context->Intermediate_Hash[4];
|
||||
F = context->Intermediate_Hash[5];
|
||||
G = context->Intermediate_Hash[6];
|
||||
H = context->Intermediate_Hash[7];
|
||||
|
||||
for (t = 0; t < 64; t++) {
|
||||
temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t];
|
||||
temp2 = SHA256_SIGMA0(A) + SHA_Maj(A,B,C);
|
||||
H = G;
|
||||
G = F;
|
||||
F = E;
|
||||
E = D + temp1;
|
||||
D = C;
|
||||
C = B;
|
||||
B = A;
|
||||
A = temp1 + temp2;
|
||||
}
|
||||
|
||||
context->Intermediate_Hash[0] += A;
|
||||
context->Intermediate_Hash[1] += B;
|
||||
context->Intermediate_Hash[2] += C;
|
||||
context->Intermediate_Hash[3] += D;
|
||||
context->Intermediate_Hash[4] += E;
|
||||
context->Intermediate_Hash[5] += F;
|
||||
context->Intermediate_Hash[6] += G;
|
||||
context->Intermediate_Hash[7] += H;
|
||||
|
||||
context->Message_Block_Index = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256Finalize
|
||||
*
|
||||
* Description:
|
||||
* This helper function finishes off the digest calculations.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The SHA context to update.
|
||||
* Pad_Byte: [in]
|
||||
* The last byte to add to the message block before the 0-padding
|
||||
* and length. This will contain the last bits of the message
|
||||
* followed by another single bit. If the message was an
|
||||
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
static void SHA224_256Finalize(_pdfio_sha256_t *context,
|
||||
uint8_t Pad_Byte)
|
||||
{
|
||||
int i;
|
||||
SHA224_256PadMessage(context, Pad_Byte);
|
||||
/* message may be sensitive, so clear it out */
|
||||
for (i = 0; i < SHA256_Message_Block_Size; ++i)
|
||||
context->Message_Block[i] = 0;
|
||||
context->Length_High = 0; /* and clear length */
|
||||
context->Length_Low = 0;
|
||||
context->Computed = 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256PadMessage
|
||||
*
|
||||
* Description:
|
||||
* According to the standard, the message must be padded to the next
|
||||
* even multiple of 512 bits. The first padding bit must be a '1'.
|
||||
* The last 64 bits represent the length of the original message.
|
||||
* All bits in between should be 0. This helper function will pad
|
||||
* the message according to those rules by filling the
|
||||
* Message_Block array accordingly. When it returns, it can be
|
||||
* assumed that the message digest has been computed.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to pad.
|
||||
* Pad_Byte: [in]
|
||||
* The last byte to add to the message block before the 0-padding
|
||||
* and length. This will contain the last bits of the message
|
||||
* followed by another single bit. If the message was an
|
||||
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
|
||||
*
|
||||
* Returns:
|
||||
* Nothing.
|
||||
*/
|
||||
static void SHA224_256PadMessage(_pdfio_sha256_t *context,
|
||||
uint8_t Pad_Byte)
|
||||
{
|
||||
/*
|
||||
* Check to see if the current message block is too small to hold
|
||||
* the initial padding bits and length. If so, we will pad the
|
||||
* block, process it, and then continue padding into a second
|
||||
* block.
|
||||
*/
|
||||
if (context->Message_Block_Index >= (SHA256_Message_Block_Size-8)) {
|
||||
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
|
||||
while (context->Message_Block_Index < SHA256_Message_Block_Size)
|
||||
context->Message_Block[context->Message_Block_Index++] = 0;
|
||||
SHA224_256ProcessMessageBlock(context);
|
||||
} else
|
||||
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
|
||||
|
||||
while (context->Message_Block_Index < (SHA256_Message_Block_Size-8))
|
||||
context->Message_Block[context->Message_Block_Index++] = 0;
|
||||
|
||||
/*
|
||||
* Store the message length as the last 8 octets
|
||||
*/
|
||||
context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
|
||||
context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
|
||||
context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
|
||||
context->Message_Block[59] = (uint8_t)(context->Length_High);
|
||||
context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
|
||||
context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
|
||||
context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
|
||||
context->Message_Block[63] = (uint8_t)(context->Length_Low);
|
||||
|
||||
SHA224_256ProcessMessageBlock(context);
|
||||
}
|
||||
|
||||
/*
|
||||
* SHA224_256ResultN
|
||||
*
|
||||
* Description:
|
||||
* This helper function will return the 224-bit or 256-bit message
|
||||
* digest into the Message_Digest array provided by the caller.
|
||||
* NOTE:
|
||||
* The first octet of hash is stored in the element with index 0,
|
||||
* the last octet of hash in the element with index 27/31.
|
||||
*
|
||||
* Parameters:
|
||||
* context: [in/out]
|
||||
* The context to use to calculate the SHA hash.
|
||||
* Message_Digest[ ]: [out]
|
||||
* Where the digest is returned.
|
||||
* HashSize: [in]
|
||||
* The size of the hash, either 28 or 32.
|
||||
*
|
||||
* Returns:
|
||||
* sha Error Code.
|
||||
*/
|
||||
static int SHA224_256ResultN(_pdfio_sha256_t *context,
|
||||
uint8_t Message_Digest[ ], int HashSize)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (!context) return shaNull;
|
||||
if (!Message_Digest) return shaNull;
|
||||
if (context->Corrupted) return context->Corrupted;
|
||||
|
||||
if (!context->Computed)
|
||||
SHA224_256Finalize(context, 0x80);
|
||||
|
||||
for (i = 0; i < HashSize; ++i)
|
||||
Message_Digest[i] = (uint8_t)
|
||||
(context->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) ));
|
||||
|
||||
return shaSuccess;
|
||||
}
|
||||
200
pdfio-stream.c
200
pdfio-stream.c
@ -54,6 +54,10 @@ pdfioStreamClose(pdfio_stream_t *st) // I - Stream
|
||||
|
||||
while ((status = deflate(&st->flate, Z_FINISH)) != Z_STREAM_END)
|
||||
{
|
||||
size_t bytes = sizeof(st->cbuffer) - st->flate.avail_out,
|
||||
// Bytes to write
|
||||
outbytes; // Actual bytes written
|
||||
|
||||
if (status < Z_OK && status != Z_BUF_ERROR)
|
||||
{
|
||||
_pdfioFileError(st->pdf, "Flate compression failed: %s", zstrerror(status));
|
||||
@ -61,20 +65,50 @@ pdfioStreamClose(pdfio_stream_t *st) // I - Stream
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (!_pdfioFileWrite(st->pdf, st->cbuffer, sizeof(st->cbuffer) - st->flate.avail_out))
|
||||
if (st->crypto_cb)
|
||||
{
|
||||
// Encrypt it first...
|
||||
outbytes = (st->crypto_cb)(&st->crypto_ctx, st->cbuffer, st->cbuffer, bytes & ~15);
|
||||
}
|
||||
else
|
||||
{
|
||||
// No encryption
|
||||
outbytes = bytes;
|
||||
}
|
||||
|
||||
if (!_pdfioFileWrite(st->pdf, st->cbuffer, outbytes))
|
||||
{
|
||||
ret = false;
|
||||
goto done;
|
||||
}
|
||||
|
||||
st->flate.next_out = (Bytef *)st->cbuffer;
|
||||
st->flate.avail_out = (uInt)sizeof(st->cbuffer);
|
||||
if (bytes > outbytes)
|
||||
{
|
||||
bytes -= outbytes;
|
||||
memmove(st->cbuffer, st->cbuffer + outbytes, bytes);
|
||||
}
|
||||
else
|
||||
{
|
||||
bytes = 0;
|
||||
}
|
||||
|
||||
st->flate.next_out = (Bytef *)st->cbuffer + bytes;
|
||||
st->flate.avail_out = (uInt)sizeof(st->cbuffer) - bytes;
|
||||
}
|
||||
|
||||
if (st->flate.avail_out < (uInt)sizeof(st->cbuffer))
|
||||
{
|
||||
// Write any residuals...
|
||||
if (!_pdfioFileWrite(st->pdf, st->cbuffer, sizeof(st->cbuffer) - st->flate.avail_out))
|
||||
size_t bytes = sizeof(st->cbuffer) - st->flate.avail_out;
|
||||
// Bytes to write
|
||||
|
||||
if (st->crypto_cb)
|
||||
{
|
||||
// Encrypt it first...
|
||||
bytes = (st->crypto_cb)(&st->crypto_ctx, st->cbuffer, st->cbuffer, bytes);
|
||||
}
|
||||
|
||||
if (!_pdfioFileWrite(st->pdf, st->cbuffer, bytes))
|
||||
{
|
||||
ret = false;
|
||||
goto done;
|
||||
@ -83,6 +117,19 @@ pdfioStreamClose(pdfio_stream_t *st) // I - Stream
|
||||
|
||||
deflateEnd(&st->flate);
|
||||
}
|
||||
else if (st->crypto_cb && st->bufptr > st->buffer)
|
||||
{
|
||||
// Encrypt and flush
|
||||
uint8_t temp[8192]; // Temporary buffer
|
||||
size_t outbytes; // Output bytes
|
||||
|
||||
outbytes = (st->crypto_cb)(&st->crypto_ctx, temp, (uint8_t *)st->buffer, (size_t)(st->bufptr - st->buffer));
|
||||
if (!_pdfioFileWrite(st->pdf, temp, outbytes))
|
||||
{
|
||||
ret = false;
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
// Save the length of this stream...
|
||||
st->obj->stream_length = (size_t)(_pdfioFileTell(st->pdf) - st->obj->stream_offset);
|
||||
@ -161,6 +208,24 @@ _pdfioStreamCreate(
|
||||
st->obj = obj;
|
||||
st->length_obj = length_obj;
|
||||
st->filter = compression;
|
||||
st->bufptr = st->buffer;
|
||||
st->bufend = st->buffer + sizeof(st->buffer);
|
||||
|
||||
if (obj->pdf->encryption)
|
||||
{
|
||||
uint8_t iv[64]; // Initialization vector
|
||||
size_t ivlen = sizeof(iv); // Length of initialization vector, if any
|
||||
|
||||
if ((st->crypto_cb = _pdfioCryptoMakeWriter(st->pdf, obj, &st->crypto_ctx, iv, &ivlen)) == NULL)
|
||||
{
|
||||
// TODO: Add error message?
|
||||
free(st);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
if (ivlen > 0)
|
||||
_pdfioFileWrite(st->pdf, iv, ivlen);
|
||||
}
|
||||
|
||||
if (compression == PDFIO_FILTER_FLATE)
|
||||
{
|
||||
@ -360,6 +425,24 @@ _pdfioStreamOpen(pdfio_obj_t *obj, // I - Object
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
if (obj->pdf->encryption)
|
||||
{
|
||||
uint8_t iv[64]; // Initialization vector
|
||||
size_t ivlen; // Length of initialization vector, if any
|
||||
|
||||
ivlen = _pdfioFilePeek(st->pdf, iv, sizeof(iv));
|
||||
|
||||
if ((st->crypto_cb = _pdfioCryptoMakeReader(st->pdf, obj, &st->crypto_ctx, iv, &ivlen)) == NULL)
|
||||
{
|
||||
// TODO: Add error message?
|
||||
free(st);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
if (ivlen > 0)
|
||||
_pdfioFileConsume(st->pdf, ivlen);
|
||||
}
|
||||
|
||||
if (decode)
|
||||
{
|
||||
// Try to decode/decompress the contents of this object...
|
||||
@ -474,6 +557,9 @@ _pdfioStreamOpen(pdfio_obj_t *obj, // I - Object
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
if (st->crypto_cb)
|
||||
rbytes = (st->crypto_cb)(&st->crypto_ctx, st->cbuffer, st->cbuffer, rbytes);
|
||||
|
||||
st->flate.next_in = (Bytef *)st->cbuffer;
|
||||
st->flate.avail_in = (uInt)rbytes;
|
||||
|
||||
@ -594,7 +680,7 @@ pdfioStreamPrintf(
|
||||
|
||||
|
||||
//
|
||||
// '()' - Write a single character to a stream.
|
||||
// 'pdfioStreamPutChar()' - Write a single character to a stream.
|
||||
//
|
||||
|
||||
bool // O - `true` on success, `false` on failure
|
||||
@ -724,8 +810,63 @@ pdfioStreamWrite(
|
||||
// Write it...
|
||||
if (st->filter == PDFIO_FILTER_NONE)
|
||||
{
|
||||
// No filtering so just write it...
|
||||
return (_pdfioFileWrite(st->pdf, buffer, bytes));
|
||||
// No filtering...
|
||||
if (st->crypto_cb)
|
||||
{
|
||||
// Encrypt data before writing...
|
||||
uint8_t temp[8192]; // Temporary buffer
|
||||
size_t cbytes, // Current bytes
|
||||
outbytes; // Output bytes
|
||||
|
||||
bufptr = (const unsigned char *)buffer;
|
||||
|
||||
while (bytes > 0)
|
||||
{
|
||||
if (st->bufptr > st->buffer || bytes < 16)
|
||||
{
|
||||
// Write through the stream's buffer...
|
||||
if ((cbytes = bytes) > (st->bufend - st->bufptr))
|
||||
cbytes = st->bufend - st->bufptr;
|
||||
|
||||
memcpy(st->bufptr, bufptr, cbytes);
|
||||
st->bufptr += cbytes;
|
||||
if (st->bufptr >= st->bufend)
|
||||
{
|
||||
// Encrypt and flush
|
||||
outbytes = (st->crypto_cb)(&st->crypto_ctx, temp, (uint8_t *)st->buffer, sizeof(st->buffer));
|
||||
if (!_pdfioFileWrite(st->pdf, temp, outbytes))
|
||||
return (false);
|
||||
|
||||
st->bufptr = st->buffer;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// Write directly up to sizeof(temp) bytes...
|
||||
if ((cbytes = bytes) > sizeof(temp))
|
||||
cbytes = sizeof(temp);
|
||||
if (cbytes & 15)
|
||||
{
|
||||
// AES has a 16-byte block size, so save the last few bytes...
|
||||
cbytes &= ~15;
|
||||
}
|
||||
|
||||
outbytes = (st->crypto_cb)(&st->crypto_ctx, temp, bufptr, cbytes);
|
||||
if (!_pdfioFileWrite(st->pdf, temp, outbytes))
|
||||
return (false);
|
||||
}
|
||||
|
||||
bytes -= cbytes;
|
||||
bufptr += cbytes;
|
||||
}
|
||||
|
||||
return (true);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Write unencrypted...
|
||||
return (_pdfioFileWrite(st->pdf, buffer, bytes));
|
||||
}
|
||||
}
|
||||
|
||||
pbline = st->pbsize - 1;
|
||||
@ -862,8 +1003,13 @@ stream_read(pdfio_stream_t *st, // I - Stream
|
||||
rbytes = _pdfioFileRead(st->pdf, buffer, bytes);
|
||||
|
||||
if (rbytes > 0)
|
||||
{
|
||||
st->remaining -= (size_t)rbytes;
|
||||
|
||||
if (st->crypto_cb)
|
||||
(st->crypto_cb)(&st->crypto_ctx, (uint8_t *)buffer, (uint8_t *)buffer, rbytes);
|
||||
}
|
||||
|
||||
return (rbytes);
|
||||
}
|
||||
else if (st->filter == PDFIO_FILTER_FLATE)
|
||||
@ -887,6 +1033,9 @@ stream_read(pdfio_stream_t *st, // I - Stream
|
||||
if (rbytes <= 0)
|
||||
return (-1); // End of file...
|
||||
|
||||
if (st->crypto_cb)
|
||||
rbytes = (st->crypto_cb)(&st->crypto_ctx, st->cbuffer, st->cbuffer, rbytes);
|
||||
|
||||
st->remaining -= (size_t)rbytes;
|
||||
st->flate.next_in = (Bytef *)st->cbuffer;
|
||||
st->flate.avail_in = (uInt)rbytes;
|
||||
@ -940,6 +1089,9 @@ stream_read(pdfio_stream_t *st, // I - Stream
|
||||
if (rbytes <= 0)
|
||||
return (-1); // End of file...
|
||||
|
||||
if (st->crypto_cb)
|
||||
rbytes = (st->crypto_cb)(&st->crypto_ctx, st->cbuffer, st->cbuffer, rbytes);
|
||||
|
||||
st->remaining -= (size_t)rbytes;
|
||||
st->flate.next_in = (Bytef *)st->cbuffer;
|
||||
st->flate.avail_in = (uInt)rbytes;
|
||||
@ -1004,6 +1156,9 @@ stream_read(pdfio_stream_t *st, // I - Stream
|
||||
if (rbytes <= 0)
|
||||
return (-1); // End of file...
|
||||
|
||||
if (st->crypto_cb)
|
||||
rbytes = (st->crypto_cb)(&st->crypto_ctx, st->cbuffer, st->cbuffer, rbytes);
|
||||
|
||||
st->remaining -= (size_t)rbytes;
|
||||
st->flate.next_in = (Bytef *)st->cbuffer;
|
||||
st->flate.avail_in = (uInt)rbytes;
|
||||
@ -1100,11 +1255,36 @@ stream_write(pdfio_stream_t *st, // I - Stream
|
||||
if (st->flate.avail_out < (sizeof(st->cbuffer) / 8))
|
||||
{
|
||||
// Flush the compression buffer...
|
||||
if (!_pdfioFileWrite(st->pdf, st->cbuffer, sizeof(st->cbuffer) - st->flate.avail_out))
|
||||
size_t cbytes = sizeof(st->cbuffer) - st->flate.avail_out,
|
||||
outbytes;
|
||||
|
||||
if (st->crypto_cb)
|
||||
{
|
||||
// Encrypt it first...
|
||||
outbytes = (st->crypto_cb)(&st->crypto_ctx, st->cbuffer, st->cbuffer, cbytes & ~15);
|
||||
}
|
||||
else
|
||||
{
|
||||
outbytes = cbytes;
|
||||
}
|
||||
|
||||
// fprintf(stderr, "stream_write: bytes=%u, outbytes=%u\n", (unsigned)bytes, (unsigned)outbytes);
|
||||
|
||||
if (!_pdfioFileWrite(st->pdf, st->cbuffer, outbytes))
|
||||
return (false);
|
||||
|
||||
st->flate.next_out = (Bytef *)st->cbuffer;
|
||||
st->flate.avail_out = sizeof(st->cbuffer);
|
||||
if (cbytes > outbytes)
|
||||
{
|
||||
cbytes -= outbytes;
|
||||
memmove(st->cbuffer, st->cbuffer + outbytes, cbytes);
|
||||
}
|
||||
else
|
||||
{
|
||||
cbytes = 0;
|
||||
}
|
||||
|
||||
st->flate.next_out = (Bytef *)st->cbuffer + cbytes;
|
||||
st->flate.avail_out = sizeof(st->cbuffer) - cbytes;
|
||||
}
|
||||
|
||||
// Deflate what we can this time...
|
||||
|
||||
@ -454,7 +454,7 @@ _pdfioTokenRead(_pdfio_token_t *tb, // I - Token buffer/stack
|
||||
return (false);
|
||||
}
|
||||
|
||||
while ((ch = get_char(tb)) != EOF && ch != '>')
|
||||
do
|
||||
{
|
||||
if (isxdigit(ch))
|
||||
{
|
||||
@ -476,6 +476,7 @@ _pdfioTokenRead(_pdfio_token_t *tb, // I - Token buffer/stack
|
||||
return (false);
|
||||
}
|
||||
}
|
||||
while ((ch = get_char(tb)) != EOF && ch != '>');
|
||||
|
||||
if (ch == EOF)
|
||||
{
|
||||
|
||||
119
pdfio-value.c
119
pdfio-value.c
@ -194,6 +194,7 @@ _pdfioValueDelete(_pdfio_value_t *v) // I - Value
|
||||
|
||||
_pdfio_value_t * // O - Value or `NULL` on error/EOF
|
||||
_pdfioValueRead(pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_obj_t *obj, // I - Object, if any
|
||||
_pdfio_token_t *tb, // I - Token buffer/stack
|
||||
_pdfio_value_t *v) // I - Value
|
||||
{
|
||||
@ -216,7 +217,8 @@ _pdfioValueRead(pdfio_file_t *pdf, // I - PDF file
|
||||
#endif // DEBUG
|
||||
|
||||
|
||||
PDFIO_DEBUG("_pdfioValueRead(pdf=%p, v=%p)\n", pdf, v);
|
||||
PDFIO_DEBUG("_pdfioValueRead(pdf=%p, obj=%p, v=%p)\n", pdf, obj, v);
|
||||
(void)obj; // TODO: Implement decryption
|
||||
|
||||
if (!_pdfioTokenGet(tb, token, sizeof(token)))
|
||||
return (NULL);
|
||||
@ -225,14 +227,14 @@ _pdfioValueRead(pdfio_file_t *pdf, // I - PDF file
|
||||
{
|
||||
// Start of array
|
||||
v->type = PDFIO_VALTYPE_ARRAY;
|
||||
if ((v->value.array = _pdfioArrayRead(pdf, tb)) == NULL)
|
||||
if ((v->value.array = _pdfioArrayRead(pdf, obj, tb)) == NULL)
|
||||
return (NULL);
|
||||
}
|
||||
else if (!strcmp(token, "<<"))
|
||||
{
|
||||
// Start of dictionary
|
||||
v->type = PDFIO_VALTYPE_DICT;
|
||||
if ((v->value.dict = _pdfioDictRead(pdf, tb)) == NULL)
|
||||
if ((v->value.dict = _pdfioDictRead(pdf, obj, tb)) == NULL)
|
||||
return (NULL);
|
||||
}
|
||||
else if (!strncmp(token, "(D:", 3))
|
||||
@ -474,6 +476,7 @@ _pdfioValueRead(pdfio_file_t *pdf, // I - PDF file
|
||||
|
||||
bool // O - `true` on success, `false` on failure
|
||||
_pdfioValueWrite(pdfio_file_t *pdf, // I - PDF file
|
||||
pdfio_obj_t *obj, // I - Object, if any
|
||||
_pdfio_value_t *v, // I - Value
|
||||
off_t *length)// O - Offset to /Length value, if any
|
||||
{
|
||||
@ -483,23 +486,47 @@ _pdfioValueWrite(pdfio_file_t *pdf, // I - PDF file
|
||||
return (false);
|
||||
|
||||
case PDFIO_VALTYPE_ARRAY :
|
||||
return (_pdfioArrayWrite(v->value.array));
|
||||
return (_pdfioArrayWrite(v->value.array, obj));
|
||||
|
||||
case PDFIO_VALTYPE_BINARY :
|
||||
{
|
||||
size_t i; // Looping var
|
||||
unsigned char *dataptr; // Pointer into data
|
||||
size_t databytes; // Bytes to write
|
||||
uint8_t temp[32768], // Temporary buffer for encryption
|
||||
*dataptr; // Pointer into data
|
||||
|
||||
if (obj && pdf->encryption)
|
||||
{
|
||||
// Write encrypted string...
|
||||
_pdfio_crypto_ctx_t ctx; // Encryption context
|
||||
_pdfio_crypto_cb_t cb; // Encryption callback
|
||||
size_t ivlen; // Number of initialization vector bytes
|
||||
|
||||
if (v->value.binary.datalen > (sizeof(temp) - 32))
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to write encrypted binary string - too long.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
cb = _pdfioCryptoMakeWriter(pdf, obj, &ctx, temp, &ivlen);
|
||||
databytes = (cb)(&ctx, temp + ivlen, v->value.binary.data, v->value.binary.datalen) + ivlen;
|
||||
dataptr = temp;
|
||||
}
|
||||
else
|
||||
{
|
||||
dataptr = v->value.binary.data;
|
||||
databytes = v->value.binary.datalen;
|
||||
}
|
||||
|
||||
if (!_pdfioFilePuts(pdf, "<"))
|
||||
return (false);
|
||||
|
||||
for (i = v->value.binary.datalen, dataptr = v->value.binary.data; i > 1; i -= 2, dataptr += 2)
|
||||
for (; databytes > 1; databytes -= 2, dataptr += 2)
|
||||
{
|
||||
if (!_pdfioFilePrintf(pdf, "%02X%02X", dataptr[0], dataptr[1]))
|
||||
return (false);
|
||||
}
|
||||
|
||||
if (i > 0)
|
||||
if (databytes > 0)
|
||||
return (_pdfioFilePrintf(pdf, "%02X>", dataptr[0]));
|
||||
else
|
||||
return (_pdfioFilePuts(pdf, ">"));
|
||||
@ -514,6 +541,7 @@ _pdfioValueWrite(pdfio_file_t *pdf, // I - PDF file
|
||||
case PDFIO_VALTYPE_DATE :
|
||||
{
|
||||
struct tm date; // Date values
|
||||
char datestr[32]; // Formatted date value
|
||||
|
||||
#ifdef _WIN32
|
||||
gmtime_s(&date, &v->value.date);
|
||||
@ -521,11 +549,45 @@ _pdfioValueWrite(pdfio_file_t *pdf, // I - PDF file
|
||||
gmtime_r(&v->value.date, &date);
|
||||
#endif // _WIN32
|
||||
|
||||
return (_pdfioFilePrintf(pdf, "(D:%04d%02d%02d%02d%02d%02dZ)", date.tm_year + 1900, date.tm_mon + 1, date.tm_mday, date.tm_hour, date.tm_min, date.tm_sec));
|
||||
snprintf(datestr, sizeof(datestr), "D:%04d%02d%02d%02d%02d%02dZ", date.tm_year + 1900, date.tm_mon + 1, date.tm_mday, date.tm_hour, date.tm_min, date.tm_sec);
|
||||
|
||||
if (obj && pdf->encryption)
|
||||
{
|
||||
// Write encrypted string...
|
||||
uint8_t temp[32768], // Encrypted bytes
|
||||
*tempptr; // Pointer into encrypted bytes
|
||||
_pdfio_crypto_ctx_t ctx; // Encryption context
|
||||
_pdfio_crypto_cb_t cb; // Encryption callback
|
||||
size_t len = strlen(datestr),
|
||||
// Length of value
|
||||
ivlen, // Number of initialization vector bytes
|
||||
tempbytes; // Number of output bytes
|
||||
|
||||
cb = _pdfioCryptoMakeWriter(pdf, obj, &ctx, temp, &ivlen);
|
||||
tempbytes = (cb)(&ctx, temp + ivlen, (const uint8_t *)datestr, len) + ivlen;
|
||||
|
||||
if (!_pdfioFilePuts(pdf, "<"))
|
||||
return (false);
|
||||
|
||||
for (tempptr = temp; tempbytes > 1; tempbytes -= 2, tempptr += 2)
|
||||
{
|
||||
if (!_pdfioFilePrintf(pdf, "%02X%02X", tempptr[0], tempptr[1]))
|
||||
return (false);
|
||||
}
|
||||
|
||||
if (tempbytes > 0)
|
||||
return (_pdfioFilePrintf(pdf, "%02X>", *tempptr));
|
||||
else
|
||||
return (_pdfioFilePuts(pdf, ">"));
|
||||
}
|
||||
else
|
||||
{
|
||||
return (_pdfioFilePrintf(pdf, "(%s)", datestr));
|
||||
}
|
||||
}
|
||||
|
||||
case PDFIO_VALTYPE_DICT :
|
||||
return (_pdfioDictWrite(v->value.dict, length));
|
||||
return (_pdfioDictWrite(v->value.dict, obj, length));
|
||||
|
||||
case PDFIO_VALTYPE_INDIRECT :
|
||||
return (_pdfioFilePrintf(pdf, " %lu %u R", (unsigned long)v->value.indirect.number, v->value.indirect.generation));
|
||||
@ -540,7 +602,44 @@ _pdfioValueWrite(pdfio_file_t *pdf, // I - PDF file
|
||||
return (_pdfioFilePrintf(pdf, " %g", v->value.number));
|
||||
|
||||
case PDFIO_VALTYPE_STRING :
|
||||
if (obj && pdf->encryption)
|
||||
{
|
||||
// Write encrypted string...
|
||||
uint8_t temp[32768], // Encrypted bytes
|
||||
*tempptr; // Pointer into encrypted bytes
|
||||
_pdfio_crypto_ctx_t ctx; // Encryption context
|
||||
_pdfio_crypto_cb_t cb; // Encryption callback
|
||||
size_t len = strlen(v->value.string),
|
||||
// Length of value
|
||||
ivlen, // Number of initialization vector bytes
|
||||
tempbytes; // Number of output bytes
|
||||
|
||||
if (len > (sizeof(temp) - 32))
|
||||
{
|
||||
_pdfioFileError(pdf, "Unable to write encrypted string - too long.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
cb = _pdfioCryptoMakeWriter(pdf, obj, &ctx, temp, &ivlen);
|
||||
tempbytes = (cb)(&ctx, temp + ivlen, (const uint8_t *)v->value.string, len) + ivlen;
|
||||
|
||||
if (!_pdfioFilePuts(pdf, "<"))
|
||||
return (false);
|
||||
|
||||
for (tempptr = temp; tempbytes > 1; tempbytes -= 2, tempptr += 2)
|
||||
{
|
||||
if (!_pdfioFilePrintf(pdf, "%02X%02X", tempptr[0], tempptr[1]))
|
||||
return (false);
|
||||
}
|
||||
|
||||
if (tempbytes > 0)
|
||||
return (_pdfioFilePrintf(pdf, "%02X>", *tempptr));
|
||||
else
|
||||
return (_pdfioFilePuts(pdf, ">"));
|
||||
}
|
||||
else
|
||||
{
|
||||
// Write unencrypted string...
|
||||
const char *start, // Start of fragment
|
||||
*end; // End of fragment
|
||||
|
||||
|
||||
24
pdfio.h
24
pdfio.h
@ -59,6 +59,14 @@ typedef struct _pdfio_file_s pdfio_file_t;
|
||||
// PDF file
|
||||
typedef bool (*pdfio_error_cb_t)(pdfio_file_t *pdf, const char *message, void *data);
|
||||
// Error callback
|
||||
typedef enum pdfio_encryption_e // PDF encryption modes
|
||||
{
|
||||
PDFIO_ENCRYPTION_NONE = 0, // No encryption
|
||||
PDFIO_ENCRYPTION_RC4_40, // 40-bit RC4 encryption (PDF 1.3)
|
||||
PDFIO_ENCRYPTION_RC4_128, // 128-bit RC4 encryption (PDF 1.4)
|
||||
PDFIO_ENCRYPTION_AES_128, // 128-bit AES encryption (PDF 1.6)
|
||||
PDFIO_ENCRYPTION_AES_256 // 256-bit AES encryption (PDF 2.0)
|
||||
} pdfio_encryption_t;
|
||||
typedef enum pdfio_filter_e // Compression/decompression filters for streams
|
||||
{
|
||||
PDFIO_FILTER_NONE, // No filter
|
||||
@ -78,6 +86,20 @@ typedef ssize_t (*pdfio_output_cb_t)(void *ctx, const void *data, size_t datalen
|
||||
// Output callback for pdfioFileCreateOutput
|
||||
typedef const char *(*pdfio_password_cb_t)(void *data, const char *filename);
|
||||
// Password callback for pdfioFileOpen
|
||||
enum pdfio_permission_e // PDF permission bits
|
||||
{
|
||||
PDFIO_PERMISSION_NONE = 0, // No permissions
|
||||
PDFIO_PERMISSION_PRINT = 0x0004, // PDF allows printing
|
||||
PDFIO_PERMISSION_MODIFY = 0x0008, // PDF allows modification
|
||||
PDFIO_PERMISSION_COPY = 0x0010, // PDF allows copying
|
||||
PDFIO_PERMISSION_ANNOTATE = 0x0020, // PDF allows annotation
|
||||
PDFIO_PERMISSION_FORMS = 0x0100, // PDF allows filling in forms
|
||||
PDFIO_PERMISSION_READING = 0x0200, // PDF allows screen reading/accessibility (deprecated in PDF 2.0)
|
||||
PDFIO_PERMISSION_ASSEMBLE = 0x0400, // PDF allows assembly (insert, delete, or rotate pages, add document outlines and thumbnails)
|
||||
PDFIO_PERMISSION_PRINT_HIGH = 0x0800, // PDF allows high quality printing
|
||||
PDFIO_PERMISSION_ALL = ~0 // All permissions
|
||||
};
|
||||
typedef int pdfio_permission_t; // PDF permission bitfield
|
||||
typedef struct pdfio_rect_s // PDF rectangle
|
||||
{
|
||||
double x1; // Lower-left X coordinate
|
||||
@ -174,6 +196,7 @@ extern size_t pdfioFileGetNumObjs(pdfio_file_t *pdf) _PDFIO_PUBLIC;
|
||||
extern size_t pdfioFileGetNumPages(pdfio_file_t *pdf) _PDFIO_PUBLIC;
|
||||
extern pdfio_obj_t *pdfioFileGetObj(pdfio_file_t *pdf, size_t n) _PDFIO_PUBLIC;
|
||||
extern pdfio_obj_t *pdfioFileGetPage(pdfio_file_t *pdf, size_t n) _PDFIO_PUBLIC;
|
||||
extern pdfio_permission_t pdfioFileGetPermissions(pdfio_file_t *pdf, pdfio_encryption_t *encryption) _PDFIO_PUBLIC;
|
||||
extern const char *pdfioFileGetProducer(pdfio_file_t *pdf) _PDFIO_PUBLIC;
|
||||
extern const char *pdfioFileGetSubject(pdfio_file_t *pdf) _PDFIO_PUBLIC;
|
||||
extern const char *pdfioFileGetTitle(pdfio_file_t *pdf) _PDFIO_PUBLIC;
|
||||
@ -183,6 +206,7 @@ extern void pdfioFileSetAuthor(pdfio_file_t *pdf, const char *value) _PDFIO_PUB
|
||||
extern void pdfioFileSetCreationDate(pdfio_file_t *pdf, time_t value) _PDFIO_PUBLIC;
|
||||
extern void pdfioFileSetCreator(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
|
||||
extern void pdfioFileSetKeywords(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
|
||||
extern bool pdfioFileSetPermissions(pdfio_file_t *pdf, pdfio_permission_t permissions, pdfio_encryption_t encryption, const char *owner_password, const char *user_password) _PDFIO_PUBLIC;
|
||||
extern void pdfioFileSetSubject(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
|
||||
extern void pdfioFileSetTitle(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
|
||||
|
||||
|
||||
@ -25,7 +25,12 @@
|
||||
279E1035267D043B00D3A349 /* ttf.h in Headers */ = {isa = PBXBuildFile; fileRef = 279E1033267D043B00D3A349 /* ttf.h */; };
|
||||
279E1036267D043B00D3A349 /* ttf.c in Sources */ = {isa = PBXBuildFile; fileRef = 279E1034267D043B00D3A349 /* ttf.c */; };
|
||||
279E103B267D04E600D3A349 /* libz.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = 279E103A267D04E600D3A349 /* libz.tbd */; };
|
||||
27CF90442711DFFE00E50FE4 /* pdfio-aes.c in Sources */ = {isa = PBXBuildFile; fileRef = 27CF90432711DFFE00E50FE4 /* pdfio-aes.c */; };
|
||||
27ECBD8926419DAB0025312A /* libpdfio.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 273440B0263D6FE200FBFD63 /* libpdfio.a */; };
|
||||
27F2F0602710BE92008ECD36 /* pdfio-md5.c in Sources */ = {isa = PBXBuildFile; fileRef = 27F2F05D2710BE92008ECD36 /* pdfio-md5.c */; };
|
||||
27F2F0612710BE92008ECD36 /* pdfio-rc4.c in Sources */ = {isa = PBXBuildFile; fileRef = 27F2F05E2710BE92008ECD36 /* pdfio-rc4.c */; };
|
||||
27F2F0622710BE92008ECD36 /* pdfio-crypto.c in Sources */ = {isa = PBXBuildFile; fileRef = 27F2F05F2710BE92008ECD36 /* pdfio-crypto.c */; };
|
||||
27F2F0642711243D008ECD36 /* pdfio-sha256.c in Sources */ = {isa = PBXBuildFile; fileRef = 27F2F0632711243D008ECD36 /* pdfio-sha256.c */; };
|
||||
/* End PBXBuildFile section */
|
||||
|
||||
/* Begin PBXContainerItemProxy section */
|
||||
@ -79,6 +84,11 @@
|
||||
279E1033267D043B00D3A349 /* ttf.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ttf.h; sourceTree = "<group>"; };
|
||||
279E1034267D043B00D3A349 /* ttf.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = ttf.c; sourceTree = "<group>"; };
|
||||
279E103A267D04E600D3A349 /* libz.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = libz.tbd; path = usr/lib/libz.tbd; sourceTree = SDKROOT; };
|
||||
27CF90432711DFFE00E50FE4 /* pdfio-aes.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-aes.c"; sourceTree = "<group>"; };
|
||||
27F2F05D2710BE92008ECD36 /* pdfio-md5.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-md5.c"; sourceTree = "<group>"; };
|
||||
27F2F05E2710BE92008ECD36 /* pdfio-rc4.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-rc4.c"; sourceTree = "<group>"; };
|
||||
27F2F05F2710BE92008ECD36 /* pdfio-crypto.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-crypto.c"; sourceTree = "<group>"; };
|
||||
27F2F0632711243D008ECD36 /* pdfio-sha256.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-sha256.c"; sourceTree = "<group>"; };
|
||||
/* End PBXFileReference section */
|
||||
|
||||
/* Begin PBXFrameworksBuildPhase section */
|
||||
@ -150,19 +160,24 @@
|
||||
279E1038267D045C00D3A349 /* Library */ = {
|
||||
isa = PBXGroup;
|
||||
children = (
|
||||
27CF90432711DFFE00E50FE4 /* pdfio-aes.c */,
|
||||
273440BA263D727800FBFD63 /* pdfio-array.c */,
|
||||
273440BB263D727800FBFD63 /* pdfio-common.c */,
|
||||
271EA703265B2B1000ACDD39 /* pdfio-content.c */,
|
||||
27F2F05F2710BE92008ECD36 /* pdfio-crypto.c */,
|
||||
273440BE263D727800FBFD63 /* pdfio-dict.c */,
|
||||
273440BD263D727800FBFD63 /* pdfio-file.c */,
|
||||
27F2F05D2710BE92008ECD36 /* pdfio-md5.c */,
|
||||
273440BC263D727800FBFD63 /* pdfio-object.c */,
|
||||
273440C2263D727800FBFD63 /* pdfio-page.c */,
|
||||
27F2F05E2710BE92008ECD36 /* pdfio-rc4.c */,
|
||||
27F2F0632711243D008ECD36 /* pdfio-sha256.c */,
|
||||
273440BF263D727800FBFD63 /* pdfio-stream.c */,
|
||||
273440B9263D727800FBFD63 /* pdfio-string.c */,
|
||||
273440E3263DD7EA00FBFD63 /* pdfio-token.c */,
|
||||
273440C0263D727800FBFD63 /* pdfio-value.c */,
|
||||
279E1033267D043B00D3A349 /* ttf.h */,
|
||||
279E1034267D043B00D3A349 /* ttf.c */,
|
||||
279E1033267D043B00D3A349 /* ttf.h */,
|
||||
);
|
||||
name = Library;
|
||||
sourceTree = "<group>";
|
||||
@ -281,11 +296,16 @@
|
||||
273440CB263D727800FBFD63 /* pdfio-value.c in Sources */,
|
||||
273440CA263D727800FBFD63 /* pdfio-stream.c in Sources */,
|
||||
273440CD263D727800FBFD63 /* pdfio-page.c in Sources */,
|
||||
27F2F0622710BE92008ECD36 /* pdfio-crypto.c in Sources */,
|
||||
27F2F0642711243D008ECD36 /* pdfio-sha256.c in Sources */,
|
||||
273440C5263D727800FBFD63 /* pdfio-array.c in Sources */,
|
||||
273440E4263DD7EA00FBFD63 /* pdfio-token.c in Sources */,
|
||||
273440C7263D727800FBFD63 /* pdfio-object.c in Sources */,
|
||||
27F2F0602710BE92008ECD36 /* pdfio-md5.c in Sources */,
|
||||
273440C4263D727800FBFD63 /* pdfio-string.c in Sources */,
|
||||
27CF90442711DFFE00E50FE4 /* pdfio-aes.c in Sources */,
|
||||
271EA705265B2B1000ACDD39 /* pdfio-content.c in Sources */,
|
||||
27F2F0612710BE92008ECD36 /* pdfio-rc4.c in Sources */,
|
||||
273440C6263D727800FBFD63 /* pdfio-common.c in Sources */,
|
||||
);
|
||||
runOnlyForDeploymentPostprocessing = 0;
|
||||
|
||||
60
pdfio1.def
60
pdfio1.def
@ -1,9 +1,67 @@
|
||||
LIBRARY pdfio1
|
||||
VERSION 1.0
|
||||
EXPORTS
|
||||
_pdfioArrayDebug
|
||||
_pdfioArrayDelete
|
||||
_pdfioArrayGetValue
|
||||
_pdfioArrayRead
|
||||
_pdfioArrayWrite
|
||||
_pdfioCryptoAESDecrypt
|
||||
_pdfioCryptoAESEncrypt
|
||||
_pdfioCryptoAESInit
|
||||
_pdfioCryptoLock
|
||||
_pdfioCryptoMD5Append
|
||||
_pdfioCryptoMD5Finish
|
||||
_pdfioCryptoMD5Init
|
||||
_pdfioCryptoMakeRandom
|
||||
_pdfioCryptoMakeReader
|
||||
_pdfioCryptoMakeWriter
|
||||
_pdfioCryptoRC4Crypt
|
||||
_pdfioCryptoRC4Init
|
||||
_pdfioCryptoSHA256Append
|
||||
_pdfioCryptoSHA256Finish
|
||||
_pdfioCryptoSHA256Init
|
||||
_pdfioCryptoUnlock
|
||||
_pdfioDictClear
|
||||
_pdfioDictDebug
|
||||
_pdfioDictDelete
|
||||
_pdfioDictGetValue
|
||||
_pdfioDictRead
|
||||
_pdfioDictSetValue
|
||||
_pdfioDictWrite
|
||||
_pdfioFileAddMappedObj
|
||||
_pdfioFileAddPage
|
||||
_pdfioFileConsume
|
||||
_pdfioFileCreateObj
|
||||
_pdfioFileDefaultError
|
||||
_pdfioFileError
|
||||
_pdfioFileFindMappedObj
|
||||
_pdfioFileFlush
|
||||
_pdfioFileGetChar
|
||||
_pdfioFileGets
|
||||
_pdfioFilePeek
|
||||
_pdfioFilePrintf
|
||||
_pdfioFilePuts
|
||||
_pdfioFileRead
|
||||
_pdfioFileSeek
|
||||
_pdfioFileTell
|
||||
_pdfioFileWrite
|
||||
_pdfioObjDelete
|
||||
_pdfioObjLoad
|
||||
_pdfioStreamCreate
|
||||
_pdfioStreamOpen
|
||||
_pdfioStringIsAllocated
|
||||
_pdfioTokenClear
|
||||
_pdfioTokenFlush
|
||||
_pdfioTokenGet
|
||||
_pdfioTokenInit
|
||||
_pdfioTokenPush
|
||||
_pdfioTokenRead
|
||||
_pdfioValueCopy
|
||||
_pdfioValueDebug
|
||||
_pdfioValueDelete
|
||||
_pdfioValueRead
|
||||
_pdfioValueWrite
|
||||
pdfioArrayAppendArray
|
||||
pdfioArrayAppendBinary
|
||||
pdfioArrayAppendBoolean
|
||||
@ -130,6 +188,7 @@ pdfioFileGetNumObjs
|
||||
pdfioFileGetNumPages
|
||||
pdfioFileGetObj
|
||||
pdfioFileGetPage
|
||||
pdfioFileGetPermissions
|
||||
pdfioFileGetProducer
|
||||
pdfioFileGetSubject
|
||||
pdfioFileGetTitle
|
||||
@ -139,6 +198,7 @@ pdfioFileSetAuthor
|
||||
pdfioFileSetCreationDate
|
||||
pdfioFileSetCreator
|
||||
pdfioFileSetKeywords
|
||||
pdfioFileSetPermissions
|
||||
pdfioFileSetSubject
|
||||
pdfioFileSetTitle
|
||||
pdfioImageGetBytesPerLine
|
||||
|
||||
345
testpdfio.c
345
testpdfio.c
@ -29,11 +29,13 @@
|
||||
// Local functions...
|
||||
//
|
||||
|
||||
static int do_crypto_tests(void);
|
||||
static int do_test_file(const char *filename, int objnum, bool verbose);
|
||||
static int do_unit_tests(void);
|
||||
static int draw_image(pdfio_stream_t *st, const char *name, double x, double y, double w, double h, const char *label);
|
||||
static bool error_cb(pdfio_file_t *pdf, const char *message, bool *error);
|
||||
static ssize_t output_cb(int *fd, const void *buffer, size_t bytes);
|
||||
static const char *password_cb(void *data, const char *filename);
|
||||
static int read_unit_file(const char *filename, size_t num_pages, size_t first_image, bool is_output);
|
||||
static ssize_t token_consume_cb(const char **s, size_t bytes);
|
||||
static ssize_t token_peek_cb(const char **s, char *buffer, size_t bytes);
|
||||
@ -111,6 +113,249 @@ main(int argc, // I - Number of command-line arguments
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'do_crypto_tests()' - Test the various cryptographic functions in PDFio.
|
||||
//
|
||||
|
||||
static int // O - Exit status
|
||||
do_crypto_tests(void)
|
||||
{
|
||||
int ret = 0; // Return value
|
||||
size_t i; // Looping var
|
||||
_pdfio_aes_t aes; // AES context
|
||||
_pdfio_md5_t md5; // MD5 context
|
||||
_pdfio_rc4_t rc4; // RC4 context
|
||||
_pdfio_sha256_t sha256; // SHA256 context
|
||||
uint8_t key[32], // Encryption/decryption key
|
||||
iv[32], // Initialization vector
|
||||
buffer[256], // Output buffer
|
||||
buffer2[256]; // Second output buffer
|
||||
const char *prefix, *suffix; // Prefix/suffix strings
|
||||
static const char *text = "Hello, World! Now is the time for all good men to come to the aid of their country.\n";
|
||||
// Test text
|
||||
static uint8_t aes128key[] = { 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c };
|
||||
static uint8_t aes128rounds[] = { 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c, 0xa0, 0xfa, 0xfe, 0x17, 0x88, 0x54, 0x2c, 0xb1, 0x23, 0xa3, 0x39, 0x39, 0x2a, 0x6c, 0x76, 0x05, 0xf2, 0xc2, 0x95, 0xf2, 0x7a, 0x96, 0xb9, 0x43, 0x59, 0x35, 0x80, 0x7a, 0x73, 0x59, 0xf6, 0x7f, 0x3d, 0x80, 0x47, 0x7d, 0x47, 0x16, 0xfe, 0x3e, 0x1e, 0x23, 0x7e, 0x44, 0x6d, 0x7a, 0x88, 0x3b, 0xef, 0x44, 0xa5, 0x41, 0xa8, 0x52, 0x5b, 0x7f, 0xb6, 0x71, 0x25, 0x3b, 0xdb, 0x0b, 0xad, 0x00, 0xd4, 0xd1, 0xc6, 0xf8, 0x7c, 0x83, 0x9d, 0x87, 0xca, 0xf2, 0xb8, 0xbc, 0x11, 0xf9, 0x15, 0xbc, 0x6d, 0x88, 0xa3, 0x7a, 0x11, 0x0b, 0x3e, 0xfd, 0xdb, 0xf9, 0x86, 0x41, 0xca, 0x00, 0x93, 0xfd, 0x4e, 0x54, 0xf7, 0x0e, 0x5f, 0x5f, 0xc9, 0xf3, 0x84, 0xa6, 0x4f, 0xb2, 0x4e, 0xa6, 0xdc, 0x4f, 0xea, 0xd2, 0x73, 0x21, 0xb5, 0x8d, 0xba, 0xd2, 0x31, 0x2b, 0xf5, 0x60, 0x7f, 0x8d, 0x29, 0x2f, 0xac, 0x77, 0x66, 0xf3, 0x19, 0xfa, 0xdc, 0x21, 0x28, 0xd1, 0x29, 0x41, 0x57, 0x5c, 0x00, 0x6e, 0xd0, 0x14, 0xf9, 0xa8, 0xc9, 0xee, 0x25, 0x89, 0xe1, 0x3f, 0x0c, 0xc8, 0xb6, 0x63, 0x0c, 0xa6 };
|
||||
// FIPS-197 example key expansion
|
||||
static uint8_t aes128text[] = { 0xfb, 0x77, 0xac, 0xce, 0x3c, 0x95, 0x40, 0xcf, 0xca, 0xc8, 0x26, 0xbf, 0xc0, 0x69, 0x73, 0x3c, 0x01, 0xfd, 0x72, 0x01, 0xeb, 0x4d, 0x6f, 0xf7, 0xb4, 0x72, 0x6d, 0x84, 0x69, 0x9f, 0x89, 0xab, 0xe6, 0x2b, 0x9a, 0x9a, 0x6e, 0xc1, 0x61, 0xd7, 0x9d, 0x83, 0x2d, 0x58, 0x55, 0xa7, 0x58, 0x50, 0x00, 0xad, 0x19, 0x7b, 0xee, 0x6a, 0x36, 0x6f, 0xd1, 0xa7, 0xa4, 0x6b, 0xc5, 0x78, 0x9a, 0x18, 0x05, 0xf0, 0x2c, 0xd4, 0x60, 0x25, 0xe0, 0xa7, 0xb1, 0x36, 0xdb, 0x18, 0xd3, 0xf7, 0x59, 0x29, 0x22, 0xec, 0x25, 0x77, 0x0d, 0x9e, 0x5a, 0x01, 0xcc, 0xf6, 0x29, 0xc2, 0x08, 0xc2, 0xfc, 0x4f };
|
||||
// Expected AES-128 CBC result
|
||||
static uint8_t aes256text[] = { 0x2b, 0x94, 0x45, 0x9e, 0xed, 0xa0, 0x89, 0x7b, 0x35, 0x4e, 0xde, 0x06, 0x00, 0x4d, 0xda, 0x6b, 0x61, 0x2f, 0xb9, 0x06, 0xd5, 0x0f, 0x22, 0xed, 0xd2, 0xe3, 0x6b, 0x39, 0x5a, 0xa1, 0xe3, 0x7d, 0xa1, 0xcc, 0xd4, 0x0b, 0x6b, 0xa4, 0xff, 0xe9, 0x9c, 0x89, 0x0c, 0xc7, 0x95, 0x47, 0x19, 0x9b, 0x06, 0xdc, 0xc8, 0x7c, 0x5c, 0x5d, 0x56, 0x99, 0x1e, 0x90, 0x7d, 0x99, 0xc5, 0x7b, 0xc4, 0xe4, 0xfb, 0x02, 0x15, 0x50, 0x23, 0x2a, 0xe4, 0xc1, 0x20, 0xfd, 0xf4, 0x03, 0xfe, 0x6f, 0x15, 0x48, 0xd8, 0x62, 0x36, 0x98, 0x2a, 0x62, 0xf5, 0x2c, 0xa6, 0xfa, 0x7a, 0x43, 0x53, 0xcd, 0xad, 0x18 };
|
||||
// Expected AES-256 CBC result
|
||||
static uint8_t md5text[16] = { 0x74, 0x0c, 0x2c, 0xea, 0xe1, 0xab, 0x06, 0x7c, 0xdb, 0x1d, 0x49, 0x1d, 0x2d, 0x66, 0xf2, 0x93 };
|
||||
// Expected MD5 hash result
|
||||
static uint8_t rc4text[] = { 0xd2, 0xa2, 0xa0, 0xf6, 0x0f, 0xb1, 0x3e, 0xa0, 0xdd, 0xe1, 0x44, 0xfd, 0xec, 0xc4, 0x55, 0xf8, 0x25, 0x68, 0xad, 0xe6, 0xb0, 0x60, 0x7a, 0x0f, 0x4e, 0xfe, 0xed, 0x9c, 0x78, 0x3a, 0xf8, 0x73, 0x79, 0xbd, 0x82, 0x88, 0x39, 0x01, 0xc7, 0xd0, 0x34, 0xfe, 0x40, 0x16, 0x93, 0x5a, 0xec, 0x81, 0xda, 0x34, 0xdf, 0x5b, 0xd1, 0x47, 0x2c, 0xfa, 0xe0, 0x13, 0xc5, 0xe2, 0xb0, 0x57, 0x5c, 0x17, 0x62, 0xaa, 0x83, 0x1c, 0x4f, 0xa0, 0x0a, 0xed, 0x6c, 0x42, 0x41, 0x8a, 0x45, 0x03, 0xb8, 0x72, 0xa8, 0x99, 0xd7, 0x06 };
|
||||
// Expected RC4 result
|
||||
static uint8_t sha256text[32] = { 0x19, 0x71, 0x9b, 0xf0, 0xc6, 0xd8, 0x34, 0xc9, 0x6e, 0x8a, 0x56, 0xcc, 0x34, 0x45, 0xb7, 0x1d, 0x5b, 0x74, 0x9c, 0x52, 0x40, 0xcd, 0x30, 0xa2, 0xc2, 0x84, 0x53, 0x83, 0x16, 0xf8, 0x1a, 0xbb };
|
||||
// Expected SHA-256 hash result
|
||||
|
||||
|
||||
fputs("_pdfioAESInit(128-bit sample key): ", stdout);
|
||||
_pdfioCryptoAESInit(&aes, aes128key, sizeof(aes128key), NULL);
|
||||
if (!memcmp(aes128rounds, aes.round_key, sizeof(aes128rounds)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; i < (sizeof(aes128rounds) - 4); i ++)
|
||||
{
|
||||
if (aes.round_key[i] != aes128rounds[i])
|
||||
break;
|
||||
}
|
||||
|
||||
prefix = i > 0 ? "..." : "";
|
||||
suffix = i < (sizeof(aes128rounds) - 4) ? "..." : "";
|
||||
|
||||
printf("FAIL (got '%s%02X%02X%02X%02X%s', expected '%s%02X%02X%02X%02X%s')\n", prefix, aes.round_key[i], aes.round_key[i + 1], aes.round_key[i + 2], aes.round_key[i + 3], suffix, prefix, aes128rounds[i], aes128rounds[i + 1], aes128rounds[i + 2], aes128rounds[i + 3], suffix);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioAESInit/Encrypt(128-bit CBC): ", stdout);
|
||||
for (i = 0; i < 16; i ++)
|
||||
{
|
||||
key[i] = (uint8_t)i + 1;
|
||||
iv[i] = (uint8_t)(0xff - i);
|
||||
}
|
||||
|
||||
_pdfioCryptoAESInit(&aes, key, 16, iv);
|
||||
_pdfioCryptoAESEncrypt(&aes, buffer, (uint8_t *)text, strlen(text));
|
||||
|
||||
if (!memcmp(aes128text, buffer, sizeof(aes128text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; i < (sizeof(aes128text) - 4); i ++)
|
||||
{
|
||||
if (buffer[i] != aes128text[i])
|
||||
break;
|
||||
}
|
||||
|
||||
prefix = i > 0 ? "..." : "";
|
||||
suffix = i < (sizeof(aes128text) - 4) ? "..." : "";
|
||||
|
||||
printf("FAIL (got '%s%02X%02X%02X%02X%s', expected '%s%02X%02X%02X%02X%s')\n", prefix, buffer[i], buffer[i + 1], buffer[i + 2], buffer[i + 3], suffix, prefix, aes128text[i], aes128text[i + 1], aes128text[i + 2], aes128text[i + 3], suffix);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioAESInit/Decrypt(128-bit CBC): ", stdout);
|
||||
_pdfioCryptoAESInit(&aes, key, 16, iv);
|
||||
_pdfioCryptoAESDecrypt(&aes, buffer2, buffer, sizeof(aes128text));
|
||||
|
||||
if (!memcmp(buffer2, text, strlen(text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; text[i + 4]; i ++)
|
||||
{
|
||||
if (buffer2[i] != text[i])
|
||||
break;
|
||||
}
|
||||
|
||||
prefix = i > 0 ? "..." : "";
|
||||
suffix = text[i + 4] ? "..." : "";
|
||||
|
||||
printf("FAIL (got '%s%02X%02X%02X%02X%s', expected '%s%02X%02X%02X%02X%s')\n", prefix, buffer2[i], buffer2[i + 1], buffer2[i + 2], buffer2[i + 3], suffix, prefix, text[i], text[i + 1], text[i + 2], text[i + 3], suffix);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioAESInit/Encrypt(256-bit CBC): ", stdout);
|
||||
for (i = 0; i < 32; i ++)
|
||||
{
|
||||
key[i] = (uint8_t)i + 1;
|
||||
iv[i] = (uint8_t)(0xff - i);
|
||||
}
|
||||
|
||||
_pdfioCryptoAESInit(&aes, key, 32, iv);
|
||||
_pdfioCryptoAESEncrypt(&aes, buffer, (uint8_t *)text, strlen(text));
|
||||
|
||||
if (!memcmp(aes256text, buffer, sizeof(aes256text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; i < (sizeof(aes256text) - 4); i ++)
|
||||
{
|
||||
if (buffer[i] != aes256text[i])
|
||||
break;
|
||||
}
|
||||
|
||||
prefix = i > 0 ? "..." : "";
|
||||
suffix = i < (sizeof(aes256text) - 4) ? "..." : "";
|
||||
|
||||
printf("FAIL (got '%s%02X%02X%02X%02X%s', expected '%s%02X%02X%02X%02X%s')\n", prefix, buffer[i], buffer[i + 1], buffer[i + 2], buffer[i + 3], suffix, prefix, aes256text[i], aes256text[i + 1], aes256text[i + 2], aes256text[i + 3], suffix);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioAESInit/Decrypt(256-bit CBC): ", stdout);
|
||||
_pdfioCryptoAESInit(&aes, key, 32, iv);
|
||||
_pdfioCryptoAESDecrypt(&aes, buffer2, buffer, sizeof(aes256text));
|
||||
|
||||
if (!memcmp(buffer2, text, strlen(text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; text[i + 4]; i ++)
|
||||
{
|
||||
if (buffer2[i] != text[i])
|
||||
break;
|
||||
}
|
||||
|
||||
prefix = i > 0 ? "..." : "";
|
||||
suffix = text[i + 4] ? "..." : "";
|
||||
|
||||
printf("FAIL (got '%s%02X%02X%02X%02X%s', expected '%s%02X%02X%02X%02X%s')\n", prefix, buffer2[i], buffer2[i + 1], buffer2[i + 2], buffer2[i + 3], suffix, prefix, text[i], text[i + 1], text[i + 2], text[i + 3], suffix);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioMD5Init/Append/Finish: ", stdout);
|
||||
_pdfioCryptoMD5Init(&md5);
|
||||
_pdfioCryptoMD5Append(&md5, (uint8_t *)text, strlen(text));
|
||||
_pdfioCryptoMD5Finish(&md5, buffer);
|
||||
|
||||
if (!memcmp(md5text, buffer, sizeof(md5text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
printf("FAIL (got '%02X%02X%02X%02X...%02X%02X%02X%02X', expected '%02X%02X%02X%02X...%02X%02X%02X%02X')\n", buffer[0], buffer[1], buffer[2], buffer[3], buffer[12], buffer[13], buffer[14], buffer[15], md5text[0], md5text[1], md5text[2], md5text[3], md5text[12], md5text[13], md5text[14], md5text[15]);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioRC4Init/Encrypt(128-bit): ", stdout);
|
||||
for (i = 0; i < 16; i ++)
|
||||
key[i] = (uint8_t)i + 1;
|
||||
|
||||
_pdfioCryptoRC4Init(&rc4, key, 16);
|
||||
_pdfioCryptoRC4Crypt(&rc4, buffer, (uint8_t *)text, strlen(text));
|
||||
|
||||
if (!memcmp(rc4text, buffer, sizeof(rc4text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; i < (sizeof(rc4text) - 4); i ++)
|
||||
{
|
||||
if (buffer[i] != rc4text[i])
|
||||
break;
|
||||
}
|
||||
|
||||
prefix = i > 0 ? "..." : "";
|
||||
suffix = i < (sizeof(rc4text) - 4) ? "..." : "";
|
||||
|
||||
printf("FAIL (got '%s%02X%02X%02X%02X%s', expected '%s%02X%02X%02X%02X%s')\n", prefix, buffer[i], buffer[i + 1], buffer[i + 2], buffer[i + 3], suffix, prefix, rc4text[i], rc4text[i + 1], rc4text[i + 2], rc4text[i + 3], suffix);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioRC4Init/Decrypt(128-bit): ", stdout);
|
||||
_pdfioCryptoRC4Init(&rc4, key, 16);
|
||||
_pdfioCryptoRC4Crypt(&rc4, buffer2, buffer, strlen(text));
|
||||
|
||||
if (!memcmp(buffer2, text, strlen(text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i = 0; text[i + 4]; i ++)
|
||||
{
|
||||
if (buffer2[i] != text[i])
|
||||
break;
|
||||
}
|
||||
|
||||
prefix = i > 0 ? "..." : "";
|
||||
suffix = text[i + 4] ? "..." : "";
|
||||
|
||||
printf("FAIL (got '%s%02X%02X%02X%02X%s', expected '%s%02X%02X%02X%02X%s')\n", prefix, buffer2[i], buffer2[i + 1], buffer2[i + 2], buffer2[i + 3], suffix, prefix, text[i], text[i + 1], text[i + 2], text[i + 3], suffix);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
fputs("_pdfioSHA256Init/Append/Finish: ", stdout);
|
||||
_pdfioCryptoSHA256Init(&sha256);
|
||||
_pdfioCryptoSHA256Append(&sha256, (uint8_t *)text, strlen(text));
|
||||
_pdfioCryptoSHA256Finish(&sha256, buffer);
|
||||
|
||||
if (!memcmp(sha256text, buffer, sizeof(sha256text)))
|
||||
{
|
||||
puts("PASS");
|
||||
}
|
||||
else
|
||||
{
|
||||
printf("FAIL (got '%02X%02X%02X%02X...%02X%02X%02X%02X', expected '%02X%02X%02X%02X...%02X%02X%02X%02X')\n", buffer[0], buffer[1], buffer[2], buffer[3], buffer[28], buffer[29], buffer[30], buffer[31], sha256text[0], sha256text[1], sha256text[2], sha256text[3], sha256text[28], sha256text[29], sha256text[30], sha256text[31]);
|
||||
ret = 1;
|
||||
}
|
||||
|
||||
return (ret);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'do_test_file()' - Try loading a PDF file and listing pages and objects.
|
||||
//
|
||||
@ -726,7 +971,7 @@ do_unit_tests(void)
|
||||
fputs("_pdfioValueRead(complex_dict): ", stdout);
|
||||
s = complex_dict;
|
||||
_pdfioTokenInit(&tb, inpdf, (_pdfio_tconsume_cb_t)token_consume_cb, (_pdfio_tpeek_cb_t)token_peek_cb, (void *)&s);
|
||||
if (_pdfioValueRead(inpdf, &tb, &value))
|
||||
if (_pdfioValueRead(inpdf, NULL, &tb, &value))
|
||||
{
|
||||
// TODO: Check value...
|
||||
fputs("PASS: ", stdout);
|
||||
@ -740,7 +985,7 @@ do_unit_tests(void)
|
||||
fputs("_pdfioValueRead(cid_dict): ", stdout);
|
||||
s = cid_dict;
|
||||
_pdfioTokenInit(&tb, inpdf, (_pdfio_tconsume_cb_t)token_consume_cb, (_pdfio_tpeek_cb_t)token_peek_cb, (void *)&s);
|
||||
if (_pdfioValueRead(inpdf, &tb, &value))
|
||||
if (_pdfioValueRead(inpdf, NULL, &tb, &value))
|
||||
{
|
||||
// TODO: Check value...
|
||||
fputs("PASS: ", stdout);
|
||||
@ -750,6 +995,10 @@ do_unit_tests(void)
|
||||
else
|
||||
goto fail;
|
||||
|
||||
// Do crypto tests...
|
||||
if (do_crypto_tests())
|
||||
return (1);
|
||||
|
||||
// Create a new PDF file...
|
||||
fputs("pdfioFileCreate(\"testpdfio-out.pdf\", ...): ", stdout);
|
||||
if ((outpdf = pdfioFileCreate("testpdfio-out.pdf", NULL, NULL, NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
|
||||
@ -763,7 +1012,7 @@ do_unit_tests(void)
|
||||
if (read_unit_file("testpdfio-out.pdf", num_pages, first_image, false))
|
||||
goto fail;
|
||||
|
||||
// Create a new PDF file...
|
||||
// Stream a new PDF file...
|
||||
if ((outfd = open("testpdfio-out2.pdf", O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0666)) < 0)
|
||||
{
|
||||
perror("Unable to open \"testpdfio-out2.pdf\"");
|
||||
@ -784,6 +1033,80 @@ do_unit_tests(void)
|
||||
if (read_unit_file("testpdfio-out2.pdf", num_pages, first_image, true))
|
||||
goto fail;
|
||||
|
||||
// Create new encrypted PDF files...
|
||||
fputs("pdfioFileCreate(\"testpdfio-rc4.pdf\", ...): ", stdout);
|
||||
if ((outpdf = pdfioFileCreate("testpdfio-rc4.pdf", NULL, NULL, NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
fputs("pdfioFileSetPermissions(all, RC4-128, no passwords): ", stdout);
|
||||
if (pdfioFileSetPermissions(outpdf, PDFIO_PERMISSION_ALL, PDFIO_ENCRYPTION_RC4_128, NULL, NULL))
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
if (write_unit_file(inpdf, outpdf, &num_pages, &first_image))
|
||||
return (1);
|
||||
|
||||
if (read_unit_file("testpdfio-rc4.pdf", num_pages, first_image, false))
|
||||
return (1);
|
||||
|
||||
// Create new encrypted PDF files...
|
||||
fputs("pdfioFileCreate(\"testpdfio-rc4p.pdf\", ...): ", stdout);
|
||||
if ((outpdf = pdfioFileCreate("testpdfio-rc4p.pdf", NULL, NULL, NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
fputs("pdfioFileSetPermissions(no-print, RC4-128, passwords='owner' and 'user'): ", stdout);
|
||||
if (pdfioFileSetPermissions(outpdf, PDFIO_PERMISSION_ALL ^ PDFIO_PERMISSION_PRINT, PDFIO_ENCRYPTION_RC4_128, "owner", "user"))
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
if (write_unit_file(inpdf, outpdf, &num_pages, &first_image))
|
||||
return (1);
|
||||
|
||||
if (read_unit_file("testpdfio-rc4p.pdf", num_pages, first_image, false))
|
||||
return (1);
|
||||
|
||||
fputs("pdfioFileCreate(\"testpdfio-aes.pdf\", ...): ", stdout);
|
||||
if ((outpdf = pdfioFileCreate("testpdfio-aes.pdf", NULL, NULL, NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
fputs("pdfioFileSetPermissions(all, AES-128, no passwords): ", stdout);
|
||||
if (pdfioFileSetPermissions(outpdf, PDFIO_PERMISSION_ALL, PDFIO_ENCRYPTION_AES_128, NULL, NULL))
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
if (write_unit_file(inpdf, outpdf, &num_pages, &first_image))
|
||||
return (1);
|
||||
|
||||
if (read_unit_file("testpdfio-aes.pdf", num_pages, first_image, false))
|
||||
return (1);
|
||||
|
||||
fputs("pdfioFileCreate(\"testpdfio-aesp.pdf\", ...): ", stdout);
|
||||
if ((outpdf = pdfioFileCreate("testpdfio-aesp.pdf", NULL, NULL, NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
fputs("pdfioFileSetPermissions(no-print, AES-128, passwords='owner' and 'user'): ", stdout);
|
||||
if (pdfioFileSetPermissions(outpdf, PDFIO_PERMISSION_ALL ^ PDFIO_PERMISSION_PRINT, PDFIO_ENCRYPTION_AES_128, "owner", "user"))
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
if (write_unit_file(inpdf, outpdf, &num_pages, &first_image))
|
||||
return (1);
|
||||
|
||||
if (read_unit_file("testpdfio-aesp.pdf", num_pages, first_image, false))
|
||||
return (1);
|
||||
|
||||
pdfioFileClose(inpdf);
|
||||
|
||||
return (0);
|
||||
@ -889,6 +1212,20 @@ output_cb(int *fd, // I - File descriptor
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'password_cb()' - Password callback for PDF file.
|
||||
//
|
||||
|
||||
static const char * // O - Password string
|
||||
password_cb(void *data, // I - Callback data
|
||||
const char *filename) // I - Filename (not used)
|
||||
{
|
||||
(void)filename;
|
||||
|
||||
return ((const char *)data);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// 'read_unit_file()' - Read back a unit test file and confirm its contents.
|
||||
//
|
||||
@ -906,7 +1243,7 @@ read_unit_file(const char *filename, // I - File to read
|
||||
|
||||
// Open the new PDF file to read it...
|
||||
printf("pdfioFileOpen(\"%s\", ...): ", filename);
|
||||
if ((pdf = pdfioFileOpen(filename, /*password_cb*/NULL, /*password_data*/NULL, (pdfio_error_cb_t)error_cb, &error)) != NULL)
|
||||
if ((pdf = pdfioFileOpen(filename, password_cb, (void *)"user", (pdfio_error_cb_t)error_cb, &error)) != NULL)
|
||||
puts("PASS");
|
||||
else
|
||||
return (1);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user