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,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  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 #include <openssl/opensslconf.h>
  52 #ifndef OPENSSL_NO_AES
  53 #include <openssl/evp.h>
  54 #include <openssl/err.h>
  55 #include <string.h>
  56 #include <assert.h>
  57 #include <openssl/aes.h>
  58 #include "evp_locl.h"
  59
  60 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  61                                         const unsigned char *iv, int enc);
  62
  63 typedef struct
  64         {
  65         AES_KEY ks;
  66         } EVP_AES_KEY;
  67
  68 #define data(ctx)       EVP_C_DATA(EVP_AES_KEY,ctx)
  69
  70 IMPLEMENT_BLOCK_CIPHER(aes_128, ks, AES, EVP_AES_KEY,
  71                        NID_aes_128, 16, 16, 16, 128,
  72                        0, aes_init_key, NULL,
  73                        EVP_CIPHER_set_asn1_iv,
  74                        EVP_CIPHER_get_asn1_iv,
  75                        NULL)
  76 IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
  77                        NID_aes_192, 16, 24, 16, 128,
  78                        0, aes_init_key, NULL,
  79                        EVP_CIPHER_set_asn1_iv,
  80                        EVP_CIPHER_get_asn1_iv,
  81                        NULL)
  82 IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
  83                        NID_aes_256, 16, 32, 16, 128,
  84                        0, aes_init_key, NULL,
  85                        EVP_CIPHER_set_asn1_iv,
  86                        EVP_CIPHER_get_asn1_iv,
  87                        NULL)
  88
  89 #define IMPLEMENT_AES_CFBR(ksize,cbits) IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16)
  90
  91 IMPLEMENT_AES_CFBR(128,1)
  92 IMPLEMENT_AES_CFBR(192,1)
  93 IMPLEMENT_AES_CFBR(256,1)
  94
  95 IMPLEMENT_AES_CFBR(128,8)
  96 IMPLEMENT_AES_CFBR(192,8)
  97 IMPLEMENT_AES_CFBR(256,8)
  98
  99 static int aes_counter (EVP_CIPHER_CTX *ctx, unsigned char *out,
 100                 const unsigned char *in, size_t len)
 101 {
 102         AES_ctr128_encrypt (in,out,len,
 103                 &((EVP_AES_KEY *)ctx->cipher_data)->ks,
 104                 ctx->iv,ctx->buf,&ctx->num);
 105         return 1;
 106 }
 107
 108 static const EVP_CIPHER aes_128_ctr_cipher=
 109         {
 110         NID_aes_128_ctr,1,16,16,
 111         EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_CUSTOM_IV,
 112         aes_init_key,
 113         aes_counter,
 114         NULL,
 115         sizeof(EVP_AES_KEY),
 116         NULL,
 117         NULL,
 118         NULL,
 119         NULL
 120         };
 121
 122 const EVP_CIPHER *EVP_aes_128_ctr (void)
 123 {       return &aes_128_ctr_cipher;     }
 124
 125 static const EVP_CIPHER aes_192_ctr_cipher=
 126         {
 127         NID_aes_192_ctr,1,24,16,
 128         EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_CUSTOM_IV,
 129         aes_init_key,
 130         aes_counter,
 131         NULL,
 132         sizeof(EVP_AES_KEY),
 133         NULL,
 134         NULL,
 135         NULL,
 136         NULL
 137         };
 138
 139 const EVP_CIPHER *EVP_aes_192_ctr (void)
 140 {       return &aes_192_ctr_cipher;     }
 141
 142 static const EVP_CIPHER aes_256_ctr_cipher=
 143         {
 144         NID_aes_256_ctr,1,32,16,
 145         EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_CUSTOM_IV,
 146         aes_init_key,
 147         aes_counter,
 148         NULL,
 149         sizeof(EVP_AES_KEY),
 150         NULL,
 151         NULL,
 152         NULL,
 153         NULL
 154         };
 155
 156 const EVP_CIPHER *EVP_aes_256_ctr (void)
 157 {       return &aes_256_ctr_cipher;     }
 158
 159 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 160                    const unsigned char *iv, int enc)
 161         {
 162         int ret;
 163
 164         if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
 165             || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
 166             && !enc)
 167                 ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 168         else
 169                 ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 170
 171         if(ret < 0)
 172                 {
 173                 EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
 174                 return 0;
 175                 }
 176
 177         if (ctx->cipher->flags&EVP_CIPH_CUSTOM_IV)
 178                 {
 179                 if (iv!=NULL)
 180                         memcpy (ctx->iv,iv,ctx->cipher->iv_len);
 181                 else    {
 182                         EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_IV_SETUP_FAILED);
 183                         return 0;
 184                         }
 185                 }
 186
 187         return 1;
 188         }
 189
 190 #endif