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Remove old per-object crypto stuff we dont need.

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Michael R Sweet 2025-04-13 09:10:17 -04:00
parent 2dcef0936e
commit 29eea131b9
No known key found for this signature in database
GPG Key ID: BE67C75EC81F3244
1 changed files with 2 additions and 63 deletions
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65
pdfio-crypto.c
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@ -409,13 +409,6 @@ _pdfioCryptoMakeReader(
uint8_t data[21]; // Key data
_pdfio_md5_t md5; // MD5 state
uint8_t digest[16]; // MD5 digest value
#if PDFIO_OBJ_CRYPT
pdfio_array_t *id_array; // Object ID array
unsigned char *id_value; // Object ID value
size_t id_len; // Length of object ID
uint8_t temp_key[16]; // File key for object
#endif // PDFIO_OBJ_CRYPT
uint8_t *file_key; // Computed file key to use
PDFIO_DEBUG("_pdfioCryptoMakeReader(pdf=%p, obj=%p(%d), ctx=%p, iv=%p, ivlen=%p(%d))\n", pdf, obj, (int)obj->number, ctx, iv, ivlen, (int)*ivlen);
@ -427,60 +420,6 @@ _pdfioCryptoMakeReader(
return (NULL);
}
#if PDFIO_OBJ_CRYPT
if ((id_array = pdfioDictGetArray(pdfioObjGetDict(obj), "ID")) != NULL)
{
// Object has its own ID that will get used for encryption...
_pdfio_md5_t md5; // MD5 context
uint8_t file_digest[16]; // MD5 digest of file ID and pad
uint8_t user_pad[32], // Padded user password
own_user_key[32], // Calculated user key
pdf_user_key[32]; // Decrypted user key
PDFIO_DEBUG("_pdfioCryptoMakeReader: Per-object file ID.\n");
if ((id_value = pdfioArrayGetBinary(id_array, 0, &id_len)) == NULL)
{
*ivlen = 0;
return (NULL);
}
_pdfioCryptoMD5Init(&md5);
_pdfioCryptoMD5Append(&md5, pdf_passpad, 32);
_pdfioCryptoMD5Append(&md5, id_value, id_len);
_pdfioCryptoMD5Finish(&md5, file_digest);
make_owner_key(pdf->encryption, pdf->password, pdf->owner_key, user_pad);
make_file_key(pdf->encryption, pdf->permissions, id_value, id_len, user_pad, pdf->owner_key, temp_key);
make_user_key(id_value, id_len, own_user_key);
if (memcmp(own_user_key, pdf->user_key, sizeof(own_user_key)))
{
PDFIO_DEBUG("_pdfioCryptoMakeReader: Not user password, trying owner password.\n");
make_file_key(pdf->encryption, pdf->permissions, id_value, id_len, pdf->password, pdf->owner_key, temp_key);
make_user_key(id_value, id_len, own_user_key);
memcpy(pdf_user_key, pdf->user_key, sizeof(pdf_user_key));
decrypt_user_key(pdf->encryption, temp_key, pdf_user_key);
if (memcmp(pdf->password, pdf_user_key, 32) && memcmp(own_user_key, pdf_user_key, 16))
{
_pdfioFileError(pdf, "Unable to unlock file.");
*ivlen = 0;
return (NULL);
}
}
file_key = temp_key;
}
else
#endif // PDFIO_OBJ_CRYPT
{
// Use the default file key...
file_key = pdf->file_key;
}
switch (pdf->encryption)
{
default :
@ -490,7 +429,7 @@ _pdfioCryptoMakeReader(
case PDFIO_ENCRYPTION_RC4_40 :
// Copy the key data for the MD5 hash.
memcpy(data, file_key, 5);
memcpy(data, pdf->file_key, 5);
data[5] = (uint8_t)obj->number;
data[6] = (uint8_t)(obj->number >> 8);
data[7] = (uint8_t)(obj->number >> 16);
@ -517,7 +456,7 @@ _pdfioCryptoMakeReader(
case PDFIO_ENCRYPTION_RC4_128 :
// Copy the key data for the MD5 hash.
memcpy(data, file_key, 16);
memcpy(data, pdf->file_key, 16);
data[16] = (uint8_t)obj->number;
data[17] = (uint8_t)(obj->number >> 8);
data[18] = (uint8_t)(obj->number >> 16);