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authorcvs2svn <admin@example.com>2015-08-02 21:54:22 +0000
committercvs2svn <admin@example.com>2015-08-02 21:54:22 +0000
commited3760bf4be4a96a89233fb8f8b84a0d44725862 (patch)
tree5609c82060f75c53af0a7641d9b33a88574876cd /src/lib/libcrypto/des/xcbc_enc.c
parentf8b563fb5ba1524c821d37308f4e6abfc866bc3f (diff)
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1/* $OpenBSD: xcbc_enc.c,v 1.9 2015/02/07 13:19:15 doug Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include "des_locl.h"
60
61/* RSA's DESX */
62
63void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out,
64 long length, DES_key_schedule *schedule,
65 DES_cblock *ivec, const_DES_cblock *inw,
66 const_DES_cblock *outw, int enc)
67 {
68 DES_LONG tin0,tin1;
69 DES_LONG tout0,tout1,xor0,xor1;
70 DES_LONG inW0,inW1,outW0,outW1;
71 const unsigned char *in2;
72 long l=length;
73 DES_LONG tin[2];
74 unsigned char *iv;
75
76 in2 = &(*inw)[0];
77 c2l(in2,inW0);
78 c2l(in2,inW1);
79 in2 = &(*outw)[0];
80 c2l(in2,outW0);
81 c2l(in2,outW1);
82
83 iv = &(*ivec)[0];
84
85 if (enc)
86 {
87 c2l(iv,tout0);
88 c2l(iv,tout1);
89 for (l-=8; l>=0; l-=8)
90 {
91 c2l(in,tin0);
92 c2l(in,tin1);
93 tin0^=tout0^inW0; tin[0]=tin0;
94 tin1^=tout1^inW1; tin[1]=tin1;
95 DES_encrypt1(tin,schedule,DES_ENCRYPT);
96 tout0=tin[0]^outW0; l2c(tout0,out);
97 tout1=tin[1]^outW1; l2c(tout1,out);
98 }
99 if (l != -8)
100 {
101 c2ln(in,tin0,tin1,l+8);
102 tin0^=tout0^inW0; tin[0]=tin0;
103 tin1^=tout1^inW1; tin[1]=tin1;
104 DES_encrypt1(tin,schedule,DES_ENCRYPT);
105 tout0=tin[0]^outW0; l2c(tout0,out);
106 tout1=tin[1]^outW1; l2c(tout1,out);
107 }
108 iv = &(*ivec)[0];
109 l2c(tout0,iv);
110 l2c(tout1,iv);
111 }
112 else
113 {
114 c2l(iv,xor0);
115 c2l(iv,xor1);
116 for (l-=8; l>0; l-=8)
117 {
118 c2l(in,tin0); tin[0]=tin0^outW0;
119 c2l(in,tin1); tin[1]=tin1^outW1;
120 DES_encrypt1(tin,schedule,DES_DECRYPT);
121 tout0=tin[0]^xor0^inW0;
122 tout1=tin[1]^xor1^inW1;
123 l2c(tout0,out);
124 l2c(tout1,out);
125 xor0=tin0;
126 xor1=tin1;
127 }
128 if (l != -8)
129 {
130 c2l(in,tin0); tin[0]=tin0^outW0;
131 c2l(in,tin1); tin[1]=tin1^outW1;
132 DES_encrypt1(tin,schedule,DES_DECRYPT);
133 tout0=tin[0]^xor0^inW0;
134 tout1=tin[1]^xor1^inW1;
135 l2cn(tout0,tout1,out,l+8);
136 xor0=tin0;
137 xor1=tin1;
138 }
139
140 iv = &(*ivec)[0];
141 l2c(xor0,iv);
142 l2c(xor1,iv);
143 }
144 tin0=tin1=tout0=tout1=xor0=xor1=0;
145 inW0=inW1=outW0=outW1=0;
146 tin[0]=tin[1]=0;
147 }
148
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