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 #ifndef NO_DESCBCM
72 #include "des_locl.h"
73
des_ede3_cbcm_encrypt(const unsigned char * in,unsigned char * out,long length,des_key_schedule ks1,des_key_schedule ks2,des_key_schedule ks3,des_cblock * ivec1,des_cblock * ivec2,int enc)74 void des_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,
75 long length, des_key_schedule ks1, des_key_schedule ks2,
76 des_key_schedule ks3, des_cblock *ivec1, des_cblock *ivec2,
77 int enc)
78 {
79 register DES_LONG tin0,tin1;
80 register DES_LONG tout0,tout1,xor0,xor1,m0,m1;
81 register long l=length;
82 DES_LONG tin[2];
83 unsigned char *iv1,*iv2;
84
85 iv1 = &(*ivec1)[0];
86 iv2 = &(*ivec2)[0];
87
88 if (enc)
89 {
90 c2l(iv1,m0);
91 c2l(iv1,m1);
92 c2l(iv2,tout0);
93 c2l(iv2,tout1);
94 for (l-=8; l>=-7; l-=8)
95 {
96 tin[0]=m0;
97 tin[1]=m1;
98 des_encrypt1(tin,ks3,1);
99 m0=tin[0];
100 m1=tin[1];
101
102 if(l < 0)
103 {
104 c2ln(in,tin0,tin1,l+8);
105 }
106 else
107 {
108 c2l(in,tin0);
109 c2l(in,tin1);
110 }
111 tin0^=tout0;
112 tin1^=tout1;
113
114 tin[0]=tin0;
115 tin[1]=tin1;
116 des_encrypt1(tin,ks1,1);
117 tin[0]^=m0;
118 tin[1]^=m1;
119 des_encrypt1(tin,ks2,0);
120 tin[0]^=m0;
121 tin[1]^=m1;
122 des_encrypt1(tin,ks1,1);
123 tout0=tin[0];
124 tout1=tin[1];
125
126 l2c(tout0,out);
127 l2c(tout1,out);
128 }
129 iv1=&(*ivec1)[0];
130 l2c(m0,iv1);
131 l2c(m1,iv1);
132
133 iv2=&(*ivec2)[0];
134 l2c(tout0,iv2);
135 l2c(tout1,iv2);
136 }
137 else
138 {
139 register DES_LONG t0,t1;
140
141 c2l(iv1,m0);
142 c2l(iv1,m1);
143 c2l(iv2,xor0);
144 c2l(iv2,xor1);
145 for (l-=8; l>=-7; l-=8)
146 {
147 tin[0]=m0;
148 tin[1]=m1;
149 des_encrypt1(tin,ks3,1);
150 m0=tin[0];
151 m1=tin[1];
152
153 c2l(in,tin0);
154 c2l(in,tin1);
155
156 t0=tin0;
157 t1=tin1;
158
159 tin[0]=tin0;
160 tin[1]=tin1;
161 des_encrypt1(tin,ks1,0);
162 tin[0]^=m0;
163 tin[1]^=m1;
164 des_encrypt1(tin,ks2,1);
165 tin[0]^=m0;
166 tin[1]^=m1;
167 des_encrypt1(tin,ks1,0);
168 tout0=tin[0];
169 tout1=tin[1];
170
171 tout0^=xor0;
172 tout1^=xor1;
173 if(l < 0)
174 {
175 l2cn(tout0,tout1,out,l+8);
176 }
177 else
178 {
179 l2c(tout0,out);
180 l2c(tout1,out);
181 }
182 xor0=t0;
183 xor1=t1;
184 }
185
186 iv1=&(*ivec1)[0];
187 l2c(m0,iv1);
188 l2c(m1,iv1);
189
190 iv2=&(*ivec2)[0];
191 l2c(xor0,iv2);
192 l2c(xor1,iv2);
193 }
194 tin0=tin1=tout0=tout1=xor0=xor1=0;
195 tin[0]=tin[1]=0;
196 }
197 #endif
198