crypto/openssl-0.9.7e/crypto/evp/e_aes.c

   1 /* ====================================================================
   2  * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    openssl-core@openssl.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  *
  49  */
  50
  51 #ifndef OPENSSL_NO_AES
  52 #include <openssl/evp.h>
  53 #include <openssl/err.h>
  54 #include <string.h>
  55 #include <openssl/aes.h>
  56 #include "evp_locl.h"
  57
  58 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  59                                         const unsigned char *iv, int enc);
  60
  61 typedef struct
  62         {
  63         AES_KEY ks;
  64         } EVP_AES_KEY;
  65
  66 #define data(ctx)       EVP_C_DATA(EVP_AES_KEY,ctx)
  67
  68 IMPLEMENT_BLOCK_CIPHER(aes_128, ks, AES, EVP_AES_KEY,
  69                        NID_aes_128, 16, 16, 16, 128,
  70                        0, aes_init_key, NULL,
  71                        EVP_CIPHER_set_asn1_iv,
  72                        EVP_CIPHER_get_asn1_iv,
  73                        NULL)
  74 IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
  75                        NID_aes_192, 16, 24, 16, 128,
  76                        0, aes_init_key, NULL,
  77                        EVP_CIPHER_set_asn1_iv,
  78                        EVP_CIPHER_get_asn1_iv,
  79                        NULL)
  80 IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
  81                        NID_aes_256, 16, 32, 16, 128,
  82                        0, aes_init_key, NULL,
  83                        EVP_CIPHER_set_asn1_iv,
  84                        EVP_CIPHER_get_asn1_iv,
  85                        NULL)
  86
  87 #define IMPLEMENT_AES_CFBR(ksize,cbits) IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16)
  88
  89 IMPLEMENT_AES_CFBR(128,1)
  90 IMPLEMENT_AES_CFBR(192,1)
  91 IMPLEMENT_AES_CFBR(256,1)
  92
  93 IMPLEMENT_AES_CFBR(128,8)
  94 IMPLEMENT_AES_CFBR(192,8)
  95 IMPLEMENT_AES_CFBR(256,8)
  96
  97 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  98                    const unsigned char *iv, int enc)
  99         {
 100         int ret;
 101
 102         if ((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CFB_MODE
 103             || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_OFB_MODE
 104             || enc)
 105                 ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 106         else
 107                 ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 108
 109         if(ret < 0)
 110                 {
 111                 EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
 112                 return 0;
 113                 }
 114
 115         return 1;
 116         }
 117
 118 #endif