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diff --git a/src/lib/libcrypto/des/ede_cbcm_enc.c b/src/lib/libcrypto/des/ede_cbcm_enc.c
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1/* $OpenBSD: ede_cbcm_enc.c,v 1.10 2024/03/29 01:47:29 joshua Exp $ */
2/* Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL
3 * project 13 Feb 1999.
4 */
5/* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59/*
60
61This is an implementation of Triple DES Cipher Block Chaining with Output
62Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom).
63
64Note that there is a known attack on this by Biham and Knudsen but it takes
65a lot of work:
66
67http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz
68
69*/
70
71#include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */
72
73#ifndef OPENSSL_NO_DESCBCM
74#include "des_local.h"
75
76void
77DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,
78 long length, DES_key_schedule *ks1, DES_key_schedule *ks2,
79 DES_key_schedule *ks3, DES_cblock *ivec1, DES_cblock *ivec2,
80 int enc)
81{
82 DES_LONG tin0, tin1;
83 DES_LONG tout0, tout1, xor0, xor1, m0, m1;
84 long l = length;
85 DES_LONG tin[2];
86 unsigned char *iv1, *iv2;
87
88 iv1 = &(*ivec1)[0];
89 iv2 = &(*ivec2)[0];
90
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 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);
185 }
186 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
187 tin[0] = tin[1] = 0;
188}
189LCRYPTO_ALIAS(DES_ede3_cbcm_encrypt);
190#endif
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