openssl/crypto/evp/e_aes.c
2010-11-17 17:46:23 +00:00

194 lines
5.6 KiB
C

/* ====================================================================
* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
*/
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_AES
#include <openssl/evp.h>
#include <openssl/err.h>
#include <string.h>
#include <assert.h>
#include <openssl/aes.h>
#include <openssl/modes.h>
#include "evp_locl.h"
static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
typedef struct
{
AES_KEY ks;
} EVP_AES_KEY;
#define data(ctx) EVP_C_DATA(EVP_AES_KEY,ctx)
IMPLEMENT_BLOCK_CIPHER(aes_128, ks, AES, EVP_AES_KEY,
NID_aes_128, 16, 16, 16, 128,
0, aes_init_key, NULL,
EVP_CIPHER_set_asn1_iv,
EVP_CIPHER_get_asn1_iv,
NULL)
IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
NID_aes_192, 16, 24, 16, 128,
0, aes_init_key, NULL,
EVP_CIPHER_set_asn1_iv,
EVP_CIPHER_get_asn1_iv,
NULL)
IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
NID_aes_256, 16, 32, 16, 128,
0, aes_init_key, NULL,
EVP_CIPHER_set_asn1_iv,
EVP_CIPHER_get_asn1_iv,
NULL)
#define IMPLEMENT_AES_CFBR(ksize,cbits) IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16)
IMPLEMENT_AES_CFBR(128,1)
IMPLEMENT_AES_CFBR(192,1)
IMPLEMENT_AES_CFBR(256,1)
IMPLEMENT_AES_CFBR(128,8)
IMPLEMENT_AES_CFBR(192,8)
IMPLEMENT_AES_CFBR(256,8)
static int aes_counter (EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t len)
{
unsigned int num;
num = ctx->num;
#ifdef AES_CTR_ASM
void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
size_t blocks, const AES_KEY *key,
const unsigned char ivec[AES_BLOCK_SIZE]);
CRYPTO_ctr128_encrypt_ctr32(in,out,len,
&((EVP_AES_KEY *)ctx->cipher_data)->ks,
ctx->iv,ctx->buf,&num,(ctr128_f)AES_ctr32_encrypt);
#else
CRYPTO_ctr128_encrypt(in,out,len,
&((EVP_AES_KEY *)ctx->cipher_data)->ks,
ctx->iv,ctx->buf,&num,(block128_f)AES_encrypt);
#endif
ctx->num = (size_t)num;
return 1;
}
static const EVP_CIPHER aes_128_ctr_cipher=
{
NID_aes_128_ctr,1,16,16,
EVP_CIPH_CTR_MODE,
aes_init_key,
aes_counter,
NULL,
sizeof(EVP_AES_KEY),
NULL,
NULL,
NULL,
NULL
};
const EVP_CIPHER *EVP_aes_128_ctr (void)
{ return &aes_128_ctr_cipher; }
static const EVP_CIPHER aes_192_ctr_cipher=
{
NID_aes_192_ctr,1,24,16,
EVP_CIPH_CTR_MODE,
aes_init_key,
aes_counter,
NULL,
sizeof(EVP_AES_KEY),
NULL,
NULL,
NULL,
NULL
};
const EVP_CIPHER *EVP_aes_192_ctr (void)
{ return &aes_192_ctr_cipher; }
static const EVP_CIPHER aes_256_ctr_cipher=
{
NID_aes_256_ctr,1,32,16,
EVP_CIPH_CTR_MODE,
aes_init_key,
aes_counter,
NULL,
sizeof(EVP_AES_KEY),
NULL,
NULL,
NULL,
NULL
};
const EVP_CIPHER *EVP_aes_256_ctr (void)
{ return &aes_256_ctr_cipher; }
static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
int ret;
if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
|| (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
&& !enc)
ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
else
ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
if(ret < 0)
{
EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
return 0;
}
return 1;
}
#endif