e_aes.c revision 296465 
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
60static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
61                        const unsigned char *iv, int enc);
62
63typedef struct {
64    AES_KEY ks;
65} EVP_AES_KEY;
66
67# define data(ctx)       EVP_C_DATA(EVP_AES_KEY,ctx)
68
69IMPLEMENT_BLOCK_CIPHER(aes_128, ks, AES, EVP_AES_KEY,
70                       NID_aes_128, 16, 16, 16, 128,
71                       EVP_CIPH_FLAG_FIPS | EVP_CIPH_FLAG_DEFAULT_ASN1,
72                       aes_init_key, NULL, NULL, NULL, NULL)
73    IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
74                       NID_aes_192, 16, 24, 16, 128,
75                       EVP_CIPH_FLAG_FIPS | EVP_CIPH_FLAG_DEFAULT_ASN1,
76                       aes_init_key, NULL, NULL, NULL, NULL)
77    IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
78                       NID_aes_256, 16, 32, 16, 128,
79                       EVP_CIPH_FLAG_FIPS | EVP_CIPH_FLAG_DEFAULT_ASN1,
80                       aes_init_key, NULL, NULL, NULL, NULL)
81# define IMPLEMENT_AES_CFBR(ksize,cbits,flags)   IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16,flags)
82    IMPLEMENT_AES_CFBR(128, 1, EVP_CIPH_FLAG_FIPS)
83    IMPLEMENT_AES_CFBR(192, 1, EVP_CIPH_FLAG_FIPS)
84    IMPLEMENT_AES_CFBR(256, 1, EVP_CIPH_FLAG_FIPS)
85
86    IMPLEMENT_AES_CFBR(128, 8, EVP_CIPH_FLAG_FIPS)
87    IMPLEMENT_AES_CFBR(192, 8, EVP_CIPH_FLAG_FIPS)
88    IMPLEMENT_AES_CFBR(256, 8, EVP_CIPH_FLAG_FIPS)
89
90static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
91                        const unsigned char *iv, int enc)
92{
93    int ret;
94
95    if ((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CFB_MODE
96        || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_OFB_MODE || enc)
97        ret = AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
98    else
99        ret = AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
100
101    if (ret < 0) {
102        EVPerr(EVP_F_AES_INIT_KEY, EVP_R_AES_KEY_SETUP_FAILED);
103        return 0;
104    }
105
106    return 1;
107}
108
109#endif
110