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/* ====================================================================
* 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/evp.h>
#include <openssl/err.h>
#include <string.h>
#include <assert.h>
static int aes_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
static int aes_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl);
static int aes_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl);
#define IMPLEMENT_AES_CIPHER(name, ciph_func, keylen, ivlen, mode) \
static EVP_CIPHER name##_cipher_st = \
{ \
NID_##name, \
16,keylen,ivlen, \
mode, \
aes_init, \
ciph_func, \
NULL, \
sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ \
sizeof((((EVP_CIPHER_CTX *)NULL)->c.rijndael)), \
EVP_CIPHER_set_asn1_iv, \
EVP_CIPHER_get_asn1_iv, \
NULL, \
NULL \
}; \
EVP_CIPHER * EVP_##name(void) \
{ \
return &name##_cipher_st; \
}
IMPLEMENT_AES_CIPHER(aes_128_ecb, aes_ecb, 16, 0, EVP_CIPH_ECB_MODE)
IMPLEMENT_AES_CIPHER(aes_192_ecb, aes_ecb, 24, 0, EVP_CIPH_ECB_MODE)
IMPLEMENT_AES_CIPHER(aes_256_ecb, aes_ecb, 32, 0, EVP_CIPH_ECB_MODE)
IMPLEMENT_AES_CIPHER(aes_128_cbc, aes_cbc, 16, 16, EVP_CIPH_CBC_MODE)
IMPLEMENT_AES_CIPHER(aes_192_cbc, aes_cbc, 24, 24, EVP_CIPH_CBC_MODE)
IMPLEMENT_AES_CIPHER(aes_256_cbc, aes_cbc, 32, 32, EVP_CIPH_CBC_MODE)
static int aes_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
RIJNDAEL_KEY *k=&ctx->c.rijndael;
if (enc)
k->rounds = rijndaelKeySetupEnc(k->rd_key, key, ctx->key_len * 8);
else
k->rounds = rijndaelKeySetupDec(k->rd_key, key, ctx->key_len * 8);
return 1;
}
static int aes_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
RIJNDAEL_KEY *k=&ctx->c.rijndael;
while(inl > 0)
{
if(ctx->encrypt)
rijndaelEncrypt(k->rd_key,k->rounds, in, out);
else
rijndaelDecrypt(k->rd_key,k->rounds, in, out);
inl-=16;
in+=16;
out+=16;
}
assert(inl == 0);
return 1;
}
static int aes_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
int n;
unsigned char tmp[16];
RIJNDAEL_KEY *k=&ctx->c.rijndael;
while(inl > 0)
{
if(ctx->encrypt)
{
for(n=0 ; n < 16 ; n++)
tmp[n] = in[n] ^ ctx->iv[n];
rijndaelEncrypt(k->rd_key,k->rounds, tmp, out);
memcpy(ctx->iv,out,16);
}
else
{
memcpy(tmp, in, 16);
rijndaelDecrypt(k->rd_key,k->rounds, in, out);
for(n=0 ; n < 16 ; n++)
out[n] ^= ctx->iv[n];
memcpy(ctx->iv,tmp,16);
}
inl-=16;
in+=16;
out+=16;
}
assert(inl == 0);
return 1;
}
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