1 /* ====================================================================
2 * Copyright (c) 2008 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/crypto.h>
52 #include "modes_lcl.h"
53 #include <string.h>
54
55 #ifndef MODES_DEBUG
56 # ifndef NDEBUG
57 # define NDEBUG
58 # endif
59 #endif
60 #include <assert.h>
61
62 #ifndef STRICT_ALIGNMENT
63 # define STRICT_ALIGNMENT 0
64 #endif
65
CRYPTO_cbc128_encrypt(const unsigned char * in,unsigned char * out,size_t len,const void * key,unsigned char ivec[16],block128_f block)66 void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
67 size_t len, const void *key,
68 unsigned char ivec[16], block128_f block)
69 {
70 size_t n;
71 const unsigned char *iv = ivec;
72
73 assert(in && out && key && ivec);
74
75 #if !defined(OPENSSL_SMALL_FOOTPRINT)
76 if (STRICT_ALIGNMENT &&
77 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
78 while (len>=16) {
79 for(n=0; n<16; ++n)
80 out[n] = in[n] ^ iv[n];
81 (*block)(out, out, key);
82 iv = out;
83 len -= 16;
84 in += 16;
85 out += 16;
86 }
87 } else {
88 while (len>=16) {
89 for(n=0; n<16; n+=sizeof(size_t))
90 *(size_t*)(out+n) =
91 *(size_t*)(in+n) ^ *(size_t*)(iv+n);
92 (*block)(out, out, key);
93 iv = out;
94 len -= 16;
95 in += 16;
96 out += 16;
97 }
98 }
99 #endif
100 while (len) {
101 for(n=0; n<16 && n<len; ++n)
102 out[n] = in[n] ^ iv[n];
103 for(; n<16; ++n)
104 out[n] = iv[n];
105 (*block)(out, out, key);
106 iv = out;
107 if (len<=16) break;
108 len -= 16;
109 in += 16;
110 out += 16;
111 }
112 memcpy(ivec,iv,16);
113 }
114
CRYPTO_cbc128_decrypt(const unsigned char * in,unsigned char * out,size_t len,const void * key,unsigned char ivec[16],block128_f block)115 void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
116 size_t len, const void *key,
117 unsigned char ivec[16], block128_f block)
118 {
119 size_t n;
120 union { size_t align; unsigned char c[16]; } tmp;
121
122 assert(in && out && key && ivec);
123
124 #if !defined(OPENSSL_SMALL_FOOTPRINT)
125 if (in != out) {
126 const unsigned char *iv = ivec;
127
128 if (STRICT_ALIGNMENT &&
129 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
130 while (len>=16) {
131 (*block)(in, out, key);
132 for(n=0; n<16; ++n)
133 out[n] ^= iv[n];
134 iv = in;
135 len -= 16;
136 in += 16;
137 out += 16;
138 }
139 }
140 else {
141 while (len>=16) {
142 (*block)(in, out, key);
143 for(n=0; n<16; n+=sizeof(size_t))
144 *(size_t *)(out+n) ^= *(size_t *)(iv+n);
145 iv = in;
146 len -= 16;
147 in += 16;
148 out += 16;
149 }
150 }
151 memcpy(ivec,iv,16);
152 } else {
153 if (STRICT_ALIGNMENT &&
154 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
155 unsigned char c;
156 while (len>=16) {
157 (*block)(in, tmp.c, key);
158 for(n=0; n<16; ++n) {
159 c = in[n];
160 out[n] = tmp.c[n] ^ ivec[n];
161 ivec[n] = c;
162 }
163 len -= 16;
164 in += 16;
165 out += 16;
166 }
167 }
168 else {
169 size_t c;
170 while (len>=16) {
171 (*block)(in, tmp.c, key);
172 for(n=0; n<16; n+=sizeof(size_t)) {
173 c = *(size_t *)(in+n);
174 *(size_t *)(out+n) =
175 *(size_t *)(tmp.c+n) ^ *(size_t *)(ivec+n);
176 *(size_t *)(ivec+n) = c;
177 }
178 len -= 16;
179 in += 16;
180 out += 16;
181 }
182 }
183 }
184 #endif
185 while (len) {
186 unsigned char c;
187 (*block)(in, tmp.c, key);
188 for(n=0; n<16 && n<len; ++n) {
189 c = in[n];
190 out[n] = tmp.c[n] ^ ivec[n];
191 ivec[n] = c;
192 }
193 if (len<=16) {
194 for (; n<16; ++n)
195 ivec[n] = in[n];
196 break;
197 }
198 len -= 16;
199 in += 16;
200 out += 16;
201 }
202 }
203