1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
58 #include <openssl/idea.h>
61 static IDEA_INT inverse(unsigned int xin);
62 void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
65 register IDEA_INT *kt, *kf, r0, r1, r2;
67 kt = &(ks->data[0][0]);
79 for (i = 0; i < 6; i++) {
82 *(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff;
84 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
86 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
88 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
90 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
92 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
96 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
97 *(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff;
102 void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk)
105 register IDEA_INT *fp, *tp, t;
107 tp = &(dk->data[0][0]);
108 fp = &(ek->data[8][0]);
109 for (r = 0; r < 9; r++) {
110 *(tp++) = inverse(fp[0]);
111 *(tp++) = ((int)(0x10000L - fp[2]) & 0xffff);
112 *(tp++) = ((int)(0x10000L - fp[1]) & 0xffff);
113 *(tp++) = inverse(fp[3]);
121 tp = &(dk->data[0][0]);
131 /* taken directly from the 'paper' I'll have a look at it later */
132 static IDEA_INT inverse(unsigned int xin)
134 long n1, n2, q, r, b1, b2, t;
159 return ((IDEA_INT) b2);