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
aes_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)99 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
100 const unsigned char *iv, int enc)
101 {
102 int ret;
103
104 if ((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CFB_MODE
105 || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_OFB_MODE
106 || enc)
107 ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
108 else
109 ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
110
111 if(ret < 0)
112 {
113 EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
114 return 0;
115 }
116
117 return 1;
118 }
119
120 #endif
121