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4a71b90d | 1 | /* ede_cbcm_enc.c */ |
0f113f3e MC |
2 | /* |
3 | * Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL project 13 Feb | |
4 | * 1999. | |
4a71b90d BL |
5 | */ |
6 | /* ==================================================================== | |
7 | * Copyright (c) 1999 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 14 | * notice, this list of conditions and the following disclaimer. |
4a71b90d BL |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * licensing@OpenSSL.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | ||
60 | /* | |
0f113f3e MC |
61 | * |
62 | * This is an implementation of Triple DES Cipher Block Chaining with Output | |
63 | * Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom). | |
64 | * | |
65 | * Note that there is a known attack on this by Biham and Knudsen but it | |
66 | * takes a lot of work: | |
67 | * | |
68 | * http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz | |
69 | * | |
70 | */ | |
4a71b90d | 71 | |
0f387945 RL |
72 | #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */ |
73 | ||
cf1b7d96 | 74 | #ifndef OPENSSL_NO_DESCBCM |
0f113f3e | 75 | # include "des_locl.h" |
4a71b90d | 76 | |
c2e4f17c | 77 | void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
78 | long length, DES_key_schedule *ks1, |
79 | DES_key_schedule *ks2, DES_key_schedule *ks3, | |
80 | DES_cblock *ivec1, DES_cblock *ivec2, int enc) | |
81 | { | |
82 | register DES_LONG tin0, tin1; | |
83 | register DES_LONG tout0, tout1, xor0, xor1, m0, m1; | |
84 | register long l = length; | |
4a71b90d | 85 | DES_LONG tin[2]; |
0f113f3e | 86 | unsigned char *iv1, *iv2; |
4a71b90d | 87 | |
edf0bfb5 BM |
88 | iv1 = &(*ivec1)[0]; |
89 | iv2 = &(*ivec2)[0]; | |
4a71b90d | 90 | |
0f113f3e MC |
91 | if (enc) { |
92 | c2l(iv1, m0); | |
93 | c2l(iv1, m1); | |
94 | c2l(iv2, tout0); | |
95 | c2l(iv2, tout1); | |
96 | for (l -= 8; l >= -7; l -= 8) { | |
97 | tin[0] = m0; | |
98 | tin[1] = m1; | |
99 | DES_encrypt1(tin, ks3, 1); | |
100 | m0 = tin[0]; | |
101 | m1 = tin[1]; | |
102 | ||
103 | if (l < 0) { | |
104 | c2ln(in, tin0, tin1, l + 8); | |
105 | } else { | |
106 | c2l(in, tin0); | |
107 | c2l(in, tin1); | |
108 | } | |
109 | tin0 ^= tout0; | |
110 | tin1 ^= tout1; | |
111 | ||
112 | tin[0] = tin0; | |
113 | tin[1] = tin1; | |
114 | DES_encrypt1(tin, ks1, 1); | |
115 | tin[0] ^= m0; | |
116 | tin[1] ^= m1; | |
117 | DES_encrypt1(tin, ks2, 0); | |
118 | tin[0] ^= m0; | |
119 | tin[1] ^= m1; | |
120 | DES_encrypt1(tin, ks1, 1); | |
121 | tout0 = tin[0]; | |
122 | tout1 = tin[1]; | |
123 | ||
124 | l2c(tout0, out); | |
125 | l2c(tout1, out); | |
126 | } | |
127 | iv1 = &(*ivec1)[0]; | |
128 | l2c(m0, iv1); | |
129 | l2c(m1, iv1); | |
130 | ||
131 | iv2 = &(*ivec2)[0]; | |
132 | l2c(tout0, iv2); | |
133 | l2c(tout1, iv2); | |
134 | } else { | |
135 | register DES_LONG t0, t1; | |
136 | ||
137 | c2l(iv1, m0); | |
138 | c2l(iv1, m1); | |
139 | c2l(iv2, xor0); | |
140 | c2l(iv2, xor1); | |
141 | for (l -= 8; l >= -7; l -= 8) { | |
142 | tin[0] = m0; | |
143 | tin[1] = m1; | |
144 | DES_encrypt1(tin, ks3, 1); | |
145 | m0 = tin[0]; | |
146 | m1 = tin[1]; | |
147 | ||
148 | c2l(in, tin0); | |
149 | c2l(in, tin1); | |
150 | ||
151 | t0 = tin0; | |
152 | t1 = tin1; | |
153 | ||
154 | tin[0] = tin0; | |
155 | tin[1] = tin1; | |
156 | DES_encrypt1(tin, ks1, 0); | |
157 | tin[0] ^= m0; | |
158 | tin[1] ^= m1; | |
159 | DES_encrypt1(tin, ks2, 1); | |
160 | tin[0] ^= m0; | |
161 | tin[1] ^= m1; | |
162 | DES_encrypt1(tin, ks1, 0); | |
163 | tout0 = tin[0]; | |
164 | tout1 = tin[1]; | |
165 | ||
166 | tout0 ^= xor0; | |
167 | tout1 ^= xor1; | |
168 | if (l < 0) { | |
169 | l2cn(tout0, tout1, out, l + 8); | |
170 | } else { | |
171 | l2c(tout0, out); | |
172 | l2c(tout1, out); | |
173 | } | |
174 | xor0 = t0; | |
175 | xor1 = t1; | |
176 | } | |
177 | ||
178 | iv1 = &(*ivec1)[0]; | |
179 | l2c(m0, iv1); | |
180 | l2c(m1, iv1); | |
181 | ||
182 | iv2 = &(*ivec2)[0]; | |
183 | l2c(xor0, iv2); | |
184 | l2c(xor1, iv2); | |
4a71b90d | 185 | } |
0f113f3e MC |
186 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
187 | tin[0] = tin[1] = 0; | |
188 | } | |
f5d7a031 | 189 | #endif |