1 /* crypto/des/xcbc_enc.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
63 void 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)
68 register DES_LONG tin0, tin1;
69 register DES_LONG tout0, tout1, xor0, xor1;
70 register DES_LONG inW0, inW1, outW0, outW1;
71 register const unsigned char *in2;
72 register long l = length;
88 for (l -= 8; l >= 0; l -= 8) {
95 DES_encrypt1(tin, schedule, DES_ENCRYPT);
96 tout0 = tin[0] ^ outW0;
98 tout1 = tin[1] ^ outW1;
102 c2ln(in, tin0, tin1, l + 8);
103 tin0 ^= tout0 ^ inW0;
105 tin1 ^= tout1 ^ inW1;
107 DES_encrypt1(tin, schedule, DES_ENCRYPT);
108 tout0 = tin[0] ^ outW0;
110 tout1 = tin[1] ^ outW1;
119 for (l -= 8; l > 0; l -= 8) {
121 tin[0] = tin0 ^ outW0;
123 tin[1] = tin1 ^ outW1;
124 DES_encrypt1(tin, schedule, DES_DECRYPT);
125 tout0 = tin[0] ^ xor0 ^ inW0;
126 tout1 = tin[1] ^ xor1 ^ inW1;
134 tin[0] = tin0 ^ outW0;
136 tin[1] = tin1 ^ outW1;
137 DES_encrypt1(tin, schedule, DES_DECRYPT);
138 tout0 = tin[0] ^ xor0 ^ inW0;
139 tout1 = tin[1] ^ xor1 ^ inW1;
140 l2cn(tout0, tout1, out, l + 8);
149 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
150 inW0 = inW1 = outW0 = outW1 = 0;