1 /* ede_cbcm_enc.c */
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
61 This is an implementation of Triple DES Cipher Block Chaining with Output
62 Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom).
63
64 Note that there is a known attack on this by Biham and Knudsen but it takes
65 a lot of work:
66
67 http://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_locl.h"
75
76 void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,
77 long length, DES_key_schedule *ks1, DES_key_schedule *ks2,
78 DES_key_schedule *ks3, DES_cblock *ivec1, DES_cblock *ivec2,
79 int enc)
80 {
81 register DES_LONG tin0,tin1;
82 register DES_LONG tout0,tout1,xor0,xor1,m0,m1;
83 register long l=length;
84 DES_LONG tin[2];
85 unsigned char *iv1,*iv2;
86
87 iv1 = &(*ivec1)[0];
88 iv2 = &(*ivec2)[0];
89
90 if (enc)
91 {
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 {
98 tin[0]=m0;
99 tin[1]=m1;
100 DES_encrypt1(tin,ks3,1);
101 m0=tin[0];
102 m1=tin[1];
103
104 if(l < 0)
105 {
106 c2ln(in,tin0,tin1,l+8);
107 }
108 else
109 {
110 c2l(in,tin0);
111 c2l(in,tin1);
112 }
113 tin0^=tout0;
114 tin1^=tout1;
115
116 tin[0]=tin0;
117 tin[1]=tin1;
118 DES_encrypt1(tin,ks1,1);
119 tin[0]^=m0;
120 tin[1]^=m1;
121 DES_encrypt1(tin,ks2,0);
122 tin[0]^=m0;
123 tin[1]^=m1;
124 DES_encrypt1(tin,ks1,1);
125 tout0=tin[0];
126 tout1=tin[1];
127
128 l2c(tout0,out);
129 l2c(tout1,out);
130 }
131 iv1=&(*ivec1)[0];
132 l2c(m0,iv1);
133 l2c(m1,iv1);
134
135 iv2=&(*ivec2)[0];
136 l2c(tout0,iv2);
137 l2c(tout1,iv2);
138 }
139 else
140 {
141 register DES_LONG t0,t1;
142
143 c2l(iv1,m0);
144 c2l(iv1,m1);
145 c2l(iv2,xor0);
146 c2l(iv2,xor1);
147 for (l-=8; l>=-7; l-=8)
148 {
149 tin[0]=m0;
150 tin[1]=m1;
151 DES_encrypt1(tin,ks3,1);
152 m0=tin[0];
153 m1=tin[1];
154
155 c2l(in,tin0);
156 c2l(in,tin1);
157
158 t0=tin0;
159 t1=tin1;
160
161 tin[0]=tin0;
162 tin[1]=tin1;
163 DES_encrypt1(tin,ks1,0);
164 tin[0]^=m0;
165 tin[1]^=m1;
166 DES_encrypt1(tin,ks2,1);
167 tin[0]^=m0;
168 tin[1]^=m1;
169 DES_encrypt1(tin,ks1,0);
170 tout0=tin[0];
171 tout1=tin[1];
172
173 tout0^=xor0;
174 tout1^=xor1;
175 if(l < 0)
176 {
177 l2cn(tout0,tout1,out,l+8);
178 }
179 else
180 {
181 l2c(tout0,out);
182 l2c(tout1,out);
183 }
184 xor0=t0;
185 xor1=t1;
186 }
187
188 iv1=&(*ivec1)[0];
189 l2c(m0,iv1);
190 l2c(m1,iv1);
191
192 iv2=&(*ivec2)[0];
193 l2c(xor0,iv2);
194 l2c(xor1,iv2);
195 }
196 tin0=tin1=tout0=tout1=xor0=xor1=0;
197 tin[0]=tin[1]=0;
198 }
199 #endif