Line data Source code
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 : #if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC)
63 : # define STRICT_ALIGNMENT 0
64 : #endif
65 :
66 734 : 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 4037 : while (len >= 16) {
89 5138 : for (n = 0; n < 16; n += sizeof(size_t))
90 10276 : *(size_t *)(out + n) =
91 5138 : *(size_t *)(in + n) ^ *(size_t *)(iv + n);
92 2569 : (*block) (out, out, key);
93 : iv = out;
94 2569 : len -= 16;
95 2569 : in += 16;
96 2569 : out += 16;
97 : }
98 : }
99 : #endif
100 734 : while (len) {
101 0 : for (n = 0; n < 16 && n < len; ++n)
102 0 : out[n] = in[n] ^ iv[n];
103 0 : for (; n < 16; ++n)
104 0 : out[n] = iv[n];
105 0 : (*block) (out, out, key);
106 : iv = out;
107 0 : if (len <= 16)
108 : break;
109 0 : len -= 16;
110 0 : in += 16;
111 0 : out += 16;
112 : }
113 : memcpy(ivec, iv, 16);
114 734 : }
115 :
116 0 : 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)
119 : {
120 : size_t n;
121 : union {
122 : size_t t[16 / sizeof(size_t)];
123 : unsigned char c[16];
124 : } tmp;
125 :
126 : assert(in && out && key && ivec);
127 :
128 : #if !defined(OPENSSL_SMALL_FOOTPRINT)
129 0 : 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 : } else if (16 % sizeof(size_t) == 0) { /* always true */
144 0 : while (len >= 16) {
145 : size_t *out_t = (size_t *)out, *iv_t = (size_t *)iv;
146 :
147 0 : (*block) (in, out, key);
148 0 : for (n = 0; n < 16 / sizeof(size_t); n++)
149 0 : out_t[n] ^= iv_t[n];
150 : iv = in;
151 0 : len -= 16;
152 0 : in += 16;
153 0 : out += 16;
154 : }
155 : }
156 : memcpy(ivec, iv, 16);
157 : } else {
158 : if (STRICT_ALIGNMENT &&
159 : ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
160 : unsigned char c;
161 : while (len >= 16) {
162 : (*block) (in, tmp.c, key);
163 : for (n = 0; n < 16; ++n) {
164 : c = in[n];
165 : out[n] = tmp.c[n] ^ ivec[n];
166 : ivec[n] = c;
167 : }
168 : len -= 16;
169 : in += 16;
170 : out += 16;
171 : }
172 : } else if (16 % sizeof(size_t) == 0) { /* always true */
173 0 : while (len >= 16) {
174 : size_t c, *out_t = (size_t *)out, *ivec_t = (size_t *)ivec;
175 : const size_t *in_t = (const size_t *)in;
176 :
177 0 : (*block) (in, tmp.c, key);
178 0 : for (n = 0; n < 16 / sizeof(size_t); n++) {
179 0 : c = in_t[n];
180 0 : out_t[n] = tmp.t[n] ^ ivec_t[n];
181 0 : ivec_t[n] = c;
182 : }
183 0 : len -= 16;
184 0 : in += 16;
185 0 : out += 16;
186 : }
187 : }
188 : }
189 : #endif
190 0 : while (len) {
191 : unsigned char c;
192 0 : (*block) (in, tmp.c, key);
193 0 : for (n = 0; n < 16 && n < len; ++n) {
194 0 : c = in[n];
195 0 : out[n] = tmp.c[n] ^ ivec[n];
196 0 : ivec[n] = c;
197 : }
198 0 : if (len <= 16) {
199 0 : for (; n < 16; ++n)
200 0 : ivec[n] = in[n];
201 : break;
202 : }
203 0 : len -= 16;
204 0 : in += 16;
205 0 : out += 16;
206 : }
207 0 : }
|
