e_aes.c revision 160815 
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	{
65	AES_KEY ks;
66	} EVP_AES_KEY;
67
68#define data(ctx)	EVP_C_DATA(EVP_AES_KEY,ctx)
69
70IMPLEMENT_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)
76IMPLEMENT_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)
82IMPLEMENT_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
91IMPLEMENT_AES_CFBR(128,1)
92IMPLEMENT_AES_CFBR(192,1)
93IMPLEMENT_AES_CFBR(256,1)
94
95IMPLEMENT_AES_CFBR(128,8)
96IMPLEMENT_AES_CFBR(192,8)
97IMPLEMENT_AES_CFBR(256,8)
98
99static 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