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[crypto] Allow creation of arbitrary CBC cipher algorithms using CBC_CIPHER()

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Given any block cipher, a corresponding CBC mode of behaviour for the
cipher can be created using the CBC_CIPHER() macro.
This commit is contained in:
Michael Brown
2009-02-19 01:48:52 +00:00
parent e950dc04ba
commit 9937bf13c9
3 changed files with 66 additions and 106 deletions
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92
src/crypto/axtls_aes.c
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@@ -33,13 +33,6 @@
/** Basic AES blocksize */
#define AES_BLOCKSIZE 16
/****************************************************************************
*
* Basic AES algorithm (independent of mode of operation)
*
****************************************************************************
*/
/** AES context */
struct aes_context {
/** AES context for AXTLS */
@@ -169,87 +162,6 @@ static struct cipher_algorithm aes_algorithm = {
.decrypt = aes_decrypt,
};
/****************************************************************************
*
* AES with cipher-block chaining (CBC)
*
****************************************************************************
*/
/** AES with CBC context */
struct aes_cbc_context {
/** AES context */
struct aes_context aes_ctx;
/** CBC context */
uint8_t cbc_ctx[AES_BLOCKSIZE];
};
/**
* Set key
*
* @v ctx Context
* @v key Key
* @v keylen Key length
* @ret rc Return status code
*/
static int aes_cbc_setkey ( void *ctx, const void *key, size_t keylen ) {
struct aes_cbc_context *aes_cbc_ctx = ctx;
return cbc_setkey ( ctx, key, keylen, &aes_algorithm,
&aes_cbc_ctx->cbc_ctx );
}
/**
* Set initialisation vector
*
* @v ctx Context
* @v iv Initialisation vector
*/
static void aes_cbc_setiv ( void *ctx, const void *iv ) {
struct aes_cbc_context *aes_cbc_ctx = ctx;
cbc_setiv ( ctx, iv, &aes_algorithm, &aes_cbc_ctx->cbc_ctx );
}
/**
* Encrypt data
*
* @v ctx Context
* @v src Data to encrypt
* @v dst Buffer for encrypted data
* @v len Length of data
*/
static void aes_cbc_encrypt ( void *ctx, const void *src, void *dst,
size_t len ) {
struct aes_cbc_context *aes_cbc_ctx = ctx;
cbc_encrypt ( &aes_cbc_ctx->aes_ctx, src, dst, len,
&aes_algorithm, &aes_cbc_ctx->cbc_ctx );
}
/**
* Decrypt data
*
* @v ctx Context
* @v src Data to decrypt
* @v dst Buffer for decrypted data
* @v len Length of data
*/
static void aes_cbc_decrypt ( void *ctx, const void *src, void *dst,
size_t len ) {
struct aes_cbc_context *aes_cbc_ctx = ctx;
cbc_decrypt ( &aes_cbc_ctx->aes_ctx, src, dst, len,
&aes_algorithm, &aes_cbc_ctx->cbc_ctx );
}
/* AES with cipher-block chaining */
struct cipher_algorithm aes_cbc_algorithm = {
.name = "aes_cbc",
.ctxsize = sizeof ( struct aes_cbc_context ),
.blocksize = AES_BLOCKSIZE,
.setkey = aes_cbc_setkey,
.setiv = aes_cbc_setiv,
.encrypt = aes_cbc_encrypt,
.decrypt = aes_cbc_decrypt,
};
CBC_CIPHER ( aes_cbc, aes_cbc_algorithm,
aes_algorithm, struct aes_context, AES_BLOCKSIZE );