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Move AES code to separate file, prep private API for making keys/contexts/callbacks for encryption.

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Michael R Sweet
2021-10-09 10:49:22 -04:00
parent 27e4ce9f42
commit 2245c9d4f5
5 changed files with 559 additions and 479 deletions
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11
pdfio-private.h
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@ -207,6 +207,13 @@ typedef struct _pdfio_sha265_s // SHA-256 hash state
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 void (*_pdfio_crypto_cb_t)(_pdfio_crypto_ctx_t *ctx, uint8_t *buffer, size_t len);
struct _pdfio_array_s
{
pdfio_file_t *pdf; // PDF file
@ -314,6 +321,8 @@ 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
};
@ -330,6 +339,8 @@ 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 _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;