1 /* $OpenBSD: cbc128.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */
2 /* ====================================================================
3 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
52 #include <openssl/crypto.h>
53 #include "modes_lcl.h"
62 #undef STRICT_ALIGNMENT
63 #ifdef __STRICT_ALIGNMENT
64 #define STRICT_ALIGNMENT 1
66 #define STRICT_ALIGNMENT 0
69 void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
70 size_t len, const void *key,
71 unsigned char ivec[16], block128_f block)
74 const unsigned char *iv = ivec;
76 #if !defined(OPENSSL_SMALL_FOOTPRINT)
77 if (STRICT_ALIGNMENT &&
78 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
81 out[n] = in[n] ^ iv[n];
82 (*block)(out, out, key);
90 for(n=0; n<16; n+=sizeof(size_t))
92 *(size_t*)(in+n) ^ *(size_t*)(iv+n);
93 (*block)(out, out, key);
102 for(n=0; n<16 && n<len; ++n)
103 out[n] = in[n] ^ iv[n];
106 (*block)(out, out, key);
116 void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
117 size_t len, const void *key,
118 unsigned char ivec[16], block128_f block)
121 union { size_t t[16/sizeof(size_t)]; unsigned char c[16]; } tmp;
123 #if !defined(OPENSSL_SMALL_FOOTPRINT)
125 const unsigned char *iv = ivec;
127 if (STRICT_ALIGNMENT &&
128 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
130 (*block)(in, out, key);
138 } else if (16%sizeof(size_t) == 0) { /* always true */
140 size_t *out_t=(size_t *)out, *iv_t=(size_t *)iv;
142 (*block)(in, out, key);
143 for(n=0; n<16/sizeof(size_t); n++)
153 if (STRICT_ALIGNMENT &&
154 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
157 (*block)(in, tmp.c, key);
158 for(n=0; n<16; ++n) {
160 out[n] = tmp.c[n] ^ ivec[n];
167 } else if (16%sizeof(size_t) == 0) { /* always true */
169 size_t c, *out_t=(size_t *)out, *ivec_t=(size_t *)ivec;
170 const size_t *in_t=(const size_t *)in;
172 (*block)(in, tmp.c, key);
173 for(n=0; n<16/sizeof(size_t); n++) {
175 out_t[n] = tmp.t[n] ^ ivec_t[n];
187 (*block)(in, tmp.c, key);
188 for(n=0; n<16 && n<len; ++n) {
190 out[n] = tmp.c[n] ^ ivec[n];