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 <openssl/modes.h>
  59 #include "evp_locl.h"
  60
  61 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  62                                         const unsigned char *iv, int enc);
  63
  64 typedef struct
  65         {
  66         AES_KEY ks;
  67         } EVP_AES_KEY;
  68
  69 #define data(ctx)       EVP_C_DATA(EVP_AES_KEY,ctx)
  70
  71 IMPLEMENT_BLOCK_CIPHER(aes_128, ks, AES, EVP_AES_KEY,
  72                        NID_aes_128, 16, 16, 16, 128,
  73                        0, aes_init_key, NULL,
  74                        EVP_CIPHER_set_asn1_iv,
  75                        EVP_CIPHER_get_asn1_iv,
  76                        NULL)
  77 IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
  78                        NID_aes_192, 16, 24, 16, 128,
  79                        0, aes_init_key, NULL,
  80                        EVP_CIPHER_set_asn1_iv,
  81                        EVP_CIPHER_get_asn1_iv,
  82                        NULL)
  83 IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
  84                        NID_aes_256, 16, 32, 16, 128,
  85                        0, aes_init_key, NULL,
  86                        EVP_CIPHER_set_asn1_iv,
  87                        EVP_CIPHER_get_asn1_iv,
  88                        NULL)
  89
  90 #define IMPLEMENT_AES_CFBR(ksize,cbits) IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16)
  91
  92 IMPLEMENT_AES_CFBR(128,1)
  93 IMPLEMENT_AES_CFBR(192,1)
  94 IMPLEMENT_AES_CFBR(256,1)
  95
  96 IMPLEMENT_AES_CFBR(128,8)
  97 IMPLEMENT_AES_CFBR(192,8)
  98 IMPLEMENT_AES_CFBR(256,8)
  99
 100 static int aes_counter (EVP_CIPHER_CTX *ctx, unsigned char *out,
 101                 const unsigned char *in, size_t len)
 102 {
 103         unsigned int num;
 104         num = ctx->num;
 105 #ifdef AES_CTR_ASM
 106         void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
 107                         size_t blocks, const AES_KEY *key,
 108                         const unsigned char ivec[AES_BLOCK_SIZE]);
 109
 110         CRYPTO_ctr128_encrypt_ctr32(in,out,len,
 111                 &((EVP_AES_KEY *)ctx->cipher_data)->ks,
 112                 ctx->iv,ctx->buf,&num,(ctr128_f)AES_ctr32_encrypt);
 113 #else
 114         CRYPTO_ctr128_encrypt(in,out,len,
 115                 &((EVP_AES_KEY *)ctx->cipher_data)->ks,
 116                 ctx->iv,ctx->buf,&num,(block128_f)AES_encrypt);
 117 #endif
 118         ctx->num = (size_t)num;
 119         return 1;
 120 }
 121
 122 static const EVP_CIPHER aes_128_ctr_cipher=
 123         {
 124         NID_aes_128_ctr,1,16,16,
 125         EVP_CIPH_CUSTOM_IV,
 126         aes_init_key,
 127         aes_counter,
 128         NULL,
 129         sizeof(EVP_AES_KEY),
 130         NULL,
 131         NULL,
 132         NULL,
 133         NULL
 134         };
 135
 136 const EVP_CIPHER *EVP_aes_128_ctr (void)
 137 {       return &aes_128_ctr_cipher;     }
 138
 139 static const EVP_CIPHER aes_192_ctr_cipher=
 140         {
 141         NID_aes_192_ctr,1,24,16,
 142         EVP_CIPH_CUSTOM_IV,
 143         aes_init_key,
 144         aes_counter,
 145         NULL,
 146         sizeof(EVP_AES_KEY),
 147         NULL,
 148         NULL,
 149         NULL,
 150         NULL
 151         };
 152
 153 const EVP_CIPHER *EVP_aes_192_ctr (void)
 154 {       return &aes_192_ctr_cipher;     }
 155
 156 static const EVP_CIPHER aes_256_ctr_cipher=
 157         {
 158         NID_aes_256_ctr,1,32,16,
 159         EVP_CIPH_CUSTOM_IV,
 160         aes_init_key,
 161         aes_counter,
 162         NULL,
 163         sizeof(EVP_AES_KEY),
 164         NULL,
 165         NULL,
 166         NULL,
 167         NULL
 168         };
 169
 170 const EVP_CIPHER *EVP_aes_256_ctr (void)
 171 {       return &aes_256_ctr_cipher;     }
 172
 173 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 174                    const unsigned char *iv, int enc)
 175         {
 176         int ret;
 177
 178         if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
 179             || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
 180             && !enc)
 181                 ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 182         else
 183                 ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 184
 185         if(ret < 0)
 186                 {
 187                 EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
 188                 return 0;
 189                 }
 190
 191         if (ctx->cipher->flags&EVP_CIPH_CUSTOM_IV)
 192                 {
 193                 if (iv!=NULL)
 194                         memcpy (ctx->iv,iv,ctx->cipher->iv_len);
 195                 else    {
 196                         EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_IV_SETUP_FAILED);
 197                         return 0;
 198                         }
 199                 }
 200
 201         return 1;
 202         }
 203
 204 #endif