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85b2c0ce AP |
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 | ||
d749e108 | 51 | #include <openssl/crypto.h> |
f472ec8c | 52 | #include "modes_lcl.h" |
85b2c0ce AP |
53 | #include <string.h> |
54 | ||
55 | #ifndef MODES_DEBUG | |
56 | # ifndef NDEBUG | |
57 | # define NDEBUG | |
58 | # endif | |
59 | #endif | |
60 | #include <assert.h> | |
61 | ||
f472ec8c | 62 | #ifndef STRICT_ALIGNMENT |
85b2c0ce AP |
63 | # define STRICT_ALIGNMENT 0 |
64 | #endif | |
65 | ||
66 | void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out, | |
67 | size_t len, const void *key, | |
63fc7f84 | 68 | unsigned char ivec[16], block128_f block) |
85b2c0ce AP |
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 | ||
115 | void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out, | |
116 | size_t len, const void *key, | |
63fc7f84 | 117 | unsigned char ivec[16], block128_f block) |
85b2c0ce AP |
118 | { |
119 | size_t n; | |
c0832990 | 120 | union { size_t t[16/sizeof(size_t)]; unsigned char c[16]; } tmp; |
85b2c0ce AP |
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 | } | |
c0832990 AP |
168 | 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; | |
85b2c0ce | 171 | while (len>=16) { |
c0832990 AP |
172 | (*block)((const unsigned char *)in_t, tmp.c, key); |
173 | for(n=0; n<16/sizeof(size_t); n++) { | |
174 | c = in_t[n]; | |
175 | out_t[n] = tmp.t[n] ^ ivec_t[n]; | |
176 | ivec_t[n] = c; | |
85b2c0ce AP |
177 | } |
178 | len -= 16; | |
c0832990 AP |
179 | in_t += 16/sizeof(size_t); |
180 | out_t += 16/sizeof(size_t); | |
85b2c0ce AP |
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 | } |