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[strongswan.git] / src / libfreeswan / libcrypto / libdes / cbc_enc.c
1 /* crypto/des/cbc_enc.c */
2 /* Copyright (C) 1995-1997 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 void des_cbc_encrypt(input, output, length, schedule, ivec, enc)
62 des_cblock (*input);
63 des_cblock (*output);
64 long length;
65 des_key_schedule schedule;
66 des_cblock (*ivec);
67 int enc;
68 {
69 register DES_LONG tin0,tin1;
70 register DES_LONG tout0,tout1,xor0,xor1;
71 register unsigned char *in,*out;
72 register long l=length;
73 DES_LONG tin[2];
74 unsigned char *iv;
75
76 in=(unsigned char *)input;
77 out=(unsigned char *)output;
78 iv=(unsigned char *)ivec;
79
80 if (enc)
81 {
82 c2l(iv,tout0);
83 c2l(iv,tout1);
84 for (l-=8; l>=0; l-=8)
85 {
86 c2l(in,tin0);
87 c2l(in,tin1);
88 tin0^=tout0; tin[0]=tin0;
89 tin1^=tout1; tin[1]=tin1;
90 des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
91 tout0=tin[0]; l2c(tout0,out);
92 tout1=tin[1]; l2c(tout1,out);
93 }
94 if (l != -8)
95 {
96 c2ln(in,tin0,tin1,l+8);
97 tin0^=tout0; tin[0]=tin0;
98 tin1^=tout1; tin[1]=tin1;
99 des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
100 tout0=tin[0]; l2c(tout0,out);
101 tout1=tin[1]; l2c(tout1,out);
102 }
103 }
104 else
105 {
106 c2l(iv,xor0);
107 c2l(iv,xor1);
108 for (l-=8; l>=0; l-=8)
109 {
110 c2l(in,tin0); tin[0]=tin0;
111 c2l(in,tin1); tin[1]=tin1;
112 des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
113 tout0=tin[0]^xor0;
114 tout1=tin[1]^xor1;
115 l2c(tout0,out);
116 l2c(tout1,out);
117 xor0=tin0;
118 xor1=tin1;
119 }
120 if (l != -8)
121 {
122 c2l(in,tin0); tin[0]=tin0;
123 c2l(in,tin1); tin[1]=tin1;
124 des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
125 tout0=tin[0]^xor0;
126 tout1=tin[1]^xor1;
127 l2cn(tout0,tout1,out,l+8);
128 /* xor0=tin0;
129 xor1=tin1; */
130 }
131 }
132 tin0=tin1=tout0=tout1=xor0=xor1=0;
133 tin[0]=tin[1]=0;
134 }
135