32c903386b42b18652eed0d1e7a38ea9c06d41e0
[openssl.git] / 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                        EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
74                        aes_init_key, NULL, NULL, NULL, NULL)
75 IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
76                        NID_aes_192, 16, 24, 16, 128,
77                        EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
78                        aes_init_key, NULL, NULL, NULL, NULL)
79 IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
80                        NID_aes_256, 16, 32, 16, 128,
81                        EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
82                        aes_init_key, NULL, NULL, NULL, NULL)
83
84 #define IMPLEMENT_AES_CFBR(ksize,cbits) IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16,EVP_CIPH_FLAG_FIPS)
85
86 IMPLEMENT_AES_CFBR(128,1)
87 IMPLEMENT_AES_CFBR(192,1)
88 IMPLEMENT_AES_CFBR(256,1)
89
90 IMPLEMENT_AES_CFBR(128,8)
91 IMPLEMENT_AES_CFBR(192,8)
92 IMPLEMENT_AES_CFBR(256,8)
93
94 static int aes_counter (EVP_CIPHER_CTX *ctx, unsigned char *out,
95                 const unsigned char *in, size_t len)
96 {
97         unsigned int num;
98         num = ctx->num;
99 #ifdef AES_CTR_ASM
100         void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
101                         size_t blocks, const AES_KEY *key,
102                         const unsigned char ivec[AES_BLOCK_SIZE]);
103
104         CRYPTO_ctr128_encrypt_ctr32(in,out,len,
105                 &((EVP_AES_KEY *)ctx->cipher_data)->ks,
106                 ctx->iv,ctx->buf,&num,(ctr128_f)AES_ctr32_encrypt);
107 #else
108         CRYPTO_ctr128_encrypt(in,out,len,
109                 &((EVP_AES_KEY *)ctx->cipher_data)->ks,
110                 ctx->iv,ctx->buf,&num,(block128_f)AES_encrypt);
111 #endif
112         ctx->num = (size_t)num;
113         return 1;
114 }
115
116 static const EVP_CIPHER aes_128_ctr_cipher=
117         {
118         NID_aes_128_ctr,1,16,16,
119         EVP_CIPH_CTR_MODE,
120         aes_init_key,
121         aes_counter,
122         NULL,
123         sizeof(EVP_AES_KEY),
124         NULL,
125         NULL,
126         NULL,
127         NULL
128         };
129
130 const EVP_CIPHER *EVP_aes_128_ctr (void)
131 {       return &aes_128_ctr_cipher;     }
132
133 static const EVP_CIPHER aes_192_ctr_cipher=
134         {
135         NID_aes_192_ctr,1,24,16,
136         EVP_CIPH_CTR_MODE,
137         aes_init_key,
138         aes_counter,
139         NULL,
140         sizeof(EVP_AES_KEY),
141         NULL,
142         NULL,
143         NULL,
144         NULL
145         };
146
147 const EVP_CIPHER *EVP_aes_192_ctr (void)
148 {       return &aes_192_ctr_cipher;     }
149
150 static const EVP_CIPHER aes_256_ctr_cipher=
151         {
152         NID_aes_256_ctr,1,32,16,
153         EVP_CIPH_CTR_MODE,
154         aes_init_key,
155         aes_counter,
156         NULL,
157         sizeof(EVP_AES_KEY),
158         NULL,
159         NULL,
160         NULL,
161         NULL
162         };
163
164 const EVP_CIPHER *EVP_aes_256_ctr (void)
165 {       return &aes_256_ctr_cipher;     }
166
167 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
168                    const unsigned char *iv, int enc)
169         {
170         int ret;
171
172         if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
173             || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
174             && !enc) 
175                 ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
176         else
177                 ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
178
179         if(ret < 0)
180                 {
181                 EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
182                 return 0;
183                 }
184
185         return 1;
186         }
187
188 #endif