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e_aes.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 "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,
                   EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
                   aes_init_key,
                   NULL, NULL, NULL, NULL)
IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
                   NID_aes_192, 16, 24, 16, 128,
                   EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
                   aes_init_key,
                   NULL, NULL, NULL, NULL)
IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
                   NID_aes_256, 16, 32, 16, 128,
                   EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
                   aes_init_key,
                   NULL, NULL, NULL, NULL)

#define IMPLEMENT_AES_CFBR(ksize,cbits,flags)   IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16,flags)

IMPLEMENT_AES_CFBR(128,1,EVP_CIPH_FLAG_FIPS)
IMPLEMENT_AES_CFBR(192,1,EVP_CIPH_FLAG_FIPS)
IMPLEMENT_AES_CFBR(256,1,EVP_CIPH_FLAG_FIPS)

IMPLEMENT_AES_CFBR(128,8,EVP_CIPH_FLAG_FIPS)
IMPLEMENT_AES_CFBR(192,8,EVP_CIPH_FLAG_FIPS)
IMPLEMENT_AES_CFBR(256,8,EVP_CIPH_FLAG_FIPS)

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_CFB_MODE
          || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_OFB_MODE
          || enc) 
            ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
      else
            ret=AES_set_decrypt_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

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