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
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_locl.h"
75
76void 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
200