123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100 |
- #ifndef _GPXE_CBC_H
- #define _GPXE_CBC_H
-
- /** @file
- *
- * Cipher-block chaining
- *
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <gpxe/crypto.h>
-
- /**
- * Set key
- *
- * @v ctx Context
- * @v key Key
- * @v keylen Key length
- * @v raw_cipher Underlying cipher algorithm
- * @v cbc_ctx CBC context
- * @ret rc Return status code
- */
- static inline int cbc_setkey ( void *ctx, const void *key, size_t keylen,
- struct cipher_algorithm *raw_cipher,
- void *cbc_ctx __unused ) {
-
- return cipher_setkey ( raw_cipher, ctx, key, keylen );
- }
-
- /**
- * Set initialisation vector
- *
- * @v ctx Context
- * @v iv Initialisation vector
- * @v raw_cipher Underlying cipher algorithm
- * @v cbc_ctx CBC context
- */
- static inline void cbc_setiv ( void *ctx __unused, const void *iv,
- struct cipher_algorithm *raw_cipher,
- void *cbc_ctx ) {
- memcpy ( cbc_ctx, iv, raw_cipher->blocksize );
- }
-
- extern void cbc_encrypt ( void *ctx, const void *src, void *dst,
- size_t len, struct cipher_algorithm *raw_cipher,
- void *cbc_ctx );
- extern void cbc_decrypt ( void *ctx, const void *src, void *dst,
- size_t len, struct cipher_algorithm *raw_cipher,
- void *cbc_ctx );
-
- /**
- * Create a cipher-block chaining mode of behaviour of an existing cipher
- *
- * @v _cbc_name Name for the new CBC cipher
- * @v _cbc_cipher New cipher algorithm
- * @v _raw_cipher Underlying cipher algorithm
- * @v _raw_context Context structure for the underlying cipher
- * @v _blocksize Cipher block size
- */
- #define CBC_CIPHER( _cbc_name, _cbc_cipher, _raw_cipher, _raw_context, \
- _blocksize ) \
- struct _cbc_name ## _context { \
- _raw_context raw_ctx; \
- uint8_t cbc_ctx[_blocksize]; \
- }; \
- static int _cbc_name ## _setkey ( void *ctx, const void *key, \
- size_t keylen ) { \
- struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
- return cbc_setkey ( &_cbc_name ## _ctx->raw_ctx, key, keylen, \
- &_raw_cipher, &_cbc_name ## _ctx->cbc_ctx );\
- } \
- static void _cbc_name ## _setiv ( void *ctx, const void *iv ) { \
- struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
- cbc_setiv ( &_cbc_name ## _ctx->raw_ctx, iv, \
- &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
- } \
- static void _cbc_name ## _encrypt ( void *ctx, const void *src, \
- void *dst, size_t len ) { \
- struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
- cbc_encrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
- &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
- } \
- static void _cbc_name ## _decrypt ( void *ctx, const void *src, \
- void *dst, size_t len ) { \
- struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
- cbc_decrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
- &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
- } \
- struct cipher_algorithm _cbc_cipher = { \
- .name = #_cbc_name, \
- .ctxsize = sizeof ( struct _cbc_name ## _context ), \
- .blocksize = _blocksize, \
- .setkey = _cbc_name ## _setkey, \
- .setiv = _cbc_name ## _setiv, \
- .encrypt = _cbc_name ## _encrypt, \
- .decrypt = _cbc_name ## _decrypt, \
- };
-
- #endif /* _GPXE_CBC_H */
|