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 "modes.h"
52 #include <string.h>
53
54 #ifndef MODES_DEBUG
55 # ifndef NDEBUG
56 # define NDEBUG
57 # endif
58 #endif
59 #include <assert.h>
60
61 #define STRICT_ALIGNMENT 1
62 #if defined(__i386) || defined(__i386__) || \
63 defined(__x86_64) || defined(__x86_64__) || \
64 defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \
65 defined(__s390__) || defined(__s390x__)
66 # undef STRICT_ALIGNMENT
67 # define STRICT_ALIGNMENT 0
68 #endif
69
CRYPTO_cbc128_encrypt(const unsigned char * in,unsigned char * out,size_t len,const void * key,unsigned char ivec[16],block128_f block)70 void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
71 size_t len, const void *key,
72 unsigned char ivec[16], block128_f block)
73 {
74 size_t n;
75 const unsigned char *iv = ivec;
76
77 assert(in && out && key && ivec);
78
79 #if !defined(OPENSSL_SMALL_FOOTPRINT)
80 if (STRICT_ALIGNMENT &&
81 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
82 while (len>=16) {
83 for(n=0; n<16; ++n)
84 out[n] = in[n] ^ iv[n];
85 (*block)(out, out, key);
86 iv = out;
87 len -= 16;
88 in += 16;
89 out += 16;
90 }
91 } else {
92 while (len>=16) {
93 for(n=0; n<16; n+=sizeof(size_t))
94 *(size_t*)(out+n) =
95 *(size_t*)(in+n) ^ *(size_t*)(iv+n);
96 (*block)(out, out, key);
97 iv = out;
98 len -= 16;
99 in += 16;
100 out += 16;
101 }
102 }
103 #endif
104 while (len) {
105 for(n=0; n<16 && n<len; ++n)
106 out[n] = in[n] ^ iv[n];
107 for(; n<16; ++n)
108 out[n] = iv[n];
109 (*block)(out, out, key);
110 iv = out;
111 if (len<=16) break;
112 len -= 16;
113 in += 16;
114 out += 16;
115 }
116 memcpy(ivec,iv,16);
117 }
118
CRYPTO_cbc128_decrypt(const unsigned char * in,unsigned char * out,size_t len,const void * key,unsigned char ivec[16],block128_f block)119 void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
120 size_t len, const void *key,
121 unsigned char ivec[16], block128_f block)
122 {
123 size_t n;
124 union { size_t align; unsigned char c[16]; } tmp;
125
126 assert(in && out && key && ivec);
127
128 #if !defined(OPENSSL_SMALL_FOOTPRINT)
129 if (in != out) {
130 const unsigned char *iv = ivec;
131
132 if (STRICT_ALIGNMENT &&
133 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
134 while (len>=16) {
135 (*block)(in, out, key);
136 for(n=0; n<16; ++n)
137 out[n] ^= iv[n];
138 iv = in;
139 len -= 16;
140 in += 16;
141 out += 16;
142 }
143 }
144 else {
145 while (len>=16) {
146 (*block)(in, out, key);
147 for(n=0; n<16; n+=sizeof(size_t))
148 *(size_t *)(out+n) ^= *(size_t *)(iv+n);
149 iv = in;
150 len -= 16;
151 in += 16;
152 out += 16;
153 }
154 }
155 memcpy(ivec,iv,16);
156 } else {
157 if (STRICT_ALIGNMENT &&
158 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) {
159 unsigned char c;
160 while (len>=16) {
161 (*block)(in, tmp.c, key);
162 for(n=0; n<16; ++n) {
163 c = in[n];
164 out[n] = tmp.c[n] ^ ivec[n];
165 ivec[n] = c;
166 }
167 len -= 16;
168 in += 16;
169 out += 16;
170 }
171 }
172 else {
173 size_t c;
174 while (len>=16) {
175 (*block)(in, tmp.c, key);
176 for(n=0; n<16; n+=sizeof(size_t)) {
177 c = *(size_t *)(in+n);
178 *(size_t *)(out+n) =
179 *(size_t *)(tmp.c+n) ^ *(size_t *)(ivec+n);
180 *(size_t *)(ivec+n) = c;
181 }
182 len -= 16;
183 in += 16;
184 out += 16;
185 }
186 }
187 }
188 #endif
189 while (len) {
190 unsigned char c;
191 (*block)(in, tmp.c, key);
192 for(n=0; n<16 && n<len; ++n) {
193 c = in[n];
194 out[n] = tmp.c[n] ^ ivec[n];
195 ivec[n] = c;
196 }
197 if (len<=16) {
198 for (; n<16; ++n)
199 ivec[n] = in[n];
200 break;
201 }
202 len -= 16;
203 in += 16;
204 out += 16;
205 }
206 }
207