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Save work on AES and RC4.

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Michael R Sweet
2021-10-04 21:13:01 -04:00
parent bb91fb4b13
commit 7fe093f3bd
5 changed files with 992 additions and 0 deletions
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32
pdfio-private.h
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@ -24,6 +24,7 @@
# include "pdfio.h"
# include <stdarg.h>
# include <stdint.h>
# include <string.h>
# include <errno.h>
# include <inttypes.h>
@ -174,6 +175,28 @@ 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;
struct _pdfio_array_s
{
pdfio_file_t *pdf; // PDF file
@ -294,6 +317,15 @@ extern _pdfio_value_t *_pdfioArrayGetValue(pdfio_array_t *a, size_t n) _PDFIO_IN
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 void _pdfioCryptoAESInit(_pdfio_aes_t *ctx, const uint8_t *key, size_t keylen, const uint8_t *iv) _PDFIO_INTERNAL;
extern void _pdfioCryptoAESDecrypt(_pdfio_aes_t *ctx, uint8_t *buffer, size_t len) _PDFIO_INTERNAL;
extern void _pdfioCryptoAESEncrypt(_pdfio_aes_t *ctx, uint8_t *buffer, size_t len) _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 void _pdfioCryptoRC4Crypt(_pdfio_rc4_t *ctx, uint8_t *buffer, size_t len) _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;