101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
#ifndef _IPXE_CBC_H
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#define _IPXE_CBC_H
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/** @file
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*
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* Cipher-block chaining
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <ipxe/crypto.h>
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/**
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* Set key
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*
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* @v ctx Context
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* @v key Key
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* @v keylen Key length
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* @v raw_cipher Underlying cipher algorithm
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* @v cbc_ctx CBC context
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* @ret rc Return status code
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*/
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static inline int cbc_setkey ( void *ctx, const void *key, size_t keylen,
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struct cipher_algorithm *raw_cipher,
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void *cbc_ctx __unused ) {
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return cipher_setkey ( raw_cipher, ctx, key, keylen );
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}
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/**
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* Set initialisation vector
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*
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* @v ctx Context
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* @v iv Initialisation vector
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* @v raw_cipher Underlying cipher algorithm
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* @v cbc_ctx CBC context
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*/
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static inline void cbc_setiv ( void *ctx __unused, const void *iv,
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struct cipher_algorithm *raw_cipher,
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void *cbc_ctx ) {
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memcpy ( cbc_ctx, iv, raw_cipher->blocksize );
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}
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extern void cbc_encrypt ( void *ctx, const void *src, void *dst,
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size_t len, struct cipher_algorithm *raw_cipher,
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void *cbc_ctx );
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extern void cbc_decrypt ( void *ctx, const void *src, void *dst,
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size_t len, struct cipher_algorithm *raw_cipher,
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void *cbc_ctx );
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/**
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* Create a cipher-block chaining mode of behaviour of an existing cipher
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*
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* @v _cbc_name Name for the new CBC cipher
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* @v _cbc_cipher New cipher algorithm
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* @v _raw_cipher Underlying cipher algorithm
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* @v _raw_context Context structure for the underlying cipher
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* @v _blocksize Cipher block size
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*/
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#define CBC_CIPHER( _cbc_name, _cbc_cipher, _raw_cipher, _raw_context, \
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_blocksize ) \
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struct _cbc_name ## _context { \
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_raw_context raw_ctx; \
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uint8_t cbc_ctx[_blocksize]; \
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}; \
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static int _cbc_name ## _setkey ( void *ctx, const void *key, \
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size_t keylen ) { \
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struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
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return cbc_setkey ( &_cbc_name ## _ctx->raw_ctx, key, keylen, \
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&_raw_cipher, &_cbc_name ## _ctx->cbc_ctx );\
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} \
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static void _cbc_name ## _setiv ( void *ctx, const void *iv ) { \
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struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
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cbc_setiv ( &_cbc_name ## _ctx->raw_ctx, iv, \
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&_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
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} \
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static void _cbc_name ## _encrypt ( void *ctx, const void *src, \
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void *dst, size_t len ) { \
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struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
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cbc_encrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
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&_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
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} \
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static void _cbc_name ## _decrypt ( void *ctx, const void *src, \
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void *dst, size_t len ) { \
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struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
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cbc_decrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
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&_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
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} \
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struct cipher_algorithm _cbc_cipher = { \
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.name = #_cbc_name, \
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.ctxsize = sizeof ( struct _cbc_name ## _context ), \
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.blocksize = _blocksize, \
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.setkey = _cbc_name ## _setkey, \
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.setiv = _cbc_name ## _setiv, \
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.encrypt = _cbc_name ## _encrypt, \
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.decrypt = _cbc_name ## _decrypt, \
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};
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#endif /* _IPXE_CBC_H */
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