Line data Source code
1 : /* crypto/idea/i_skey.c */
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 <openssl/crypto.h>
60 : #include <openssl/idea.h>
61 : #include "idea_lcl.h"
62 :
63 : static IDEA_INT inverse(unsigned int xin);
64 0 : void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
65 : #ifdef OPENSSL_FIPS
66 : {
67 : fips_cipher_abort(IDEA);
68 : private_idea_set_encrypt_key(key, ks);
69 : }
70 :
71 : void private_idea_set_encrypt_key(const unsigned char *key,
72 : IDEA_KEY_SCHEDULE *ks)
73 : #endif
74 : {
75 : int i;
76 : register IDEA_INT *kt, *kf, r0, r1, r2;
77 :
78 0 : kt = &(ks->data[0][0]);
79 0 : n2s(key, kt[0]);
80 0 : n2s(key, kt[1]);
81 0 : n2s(key, kt[2]);
82 0 : n2s(key, kt[3]);
83 0 : n2s(key, kt[4]);
84 0 : n2s(key, kt[5]);
85 0 : n2s(key, kt[6]);
86 0 : n2s(key, kt[7]);
87 :
88 : kf = kt;
89 0 : kt += 8;
90 0 : for (i = 0; i < 6; i++) {
91 0 : r2 = kf[1];
92 0 : r1 = kf[2];
93 0 : *(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff;
94 0 : r0 = kf[3];
95 0 : *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
96 0 : r1 = kf[4];
97 0 : *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
98 0 : r0 = kf[5];
99 0 : *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
100 0 : r1 = kf[6];
101 0 : *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
102 0 : r0 = kf[7];
103 0 : *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
104 0 : r1 = kf[0];
105 0 : if (i >= 5)
106 : break;
107 0 : *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
108 0 : *(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff;
109 0 : kf += 8;
110 : }
111 0 : }
112 :
113 0 : void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk)
114 : {
115 : int r;
116 : register IDEA_INT *fp, *tp, t;
117 :
118 0 : tp = &(dk->data[0][0]);
119 0 : fp = &(ek->data[8][0]);
120 0 : for (r = 0; r < 9; r++) {
121 0 : *(tp++) = inverse(fp[0]);
122 0 : *(tp++) = ((int)(0x10000L - fp[2]) & 0xffff);
123 0 : *(tp++) = ((int)(0x10000L - fp[1]) & 0xffff);
124 0 : *(tp++) = inverse(fp[3]);
125 0 : if (r == 8)
126 : break;
127 0 : fp -= 6;
128 0 : *(tp++) = fp[4];
129 0 : *(tp++) = fp[5];
130 : }
131 :
132 : tp = &(dk->data[0][0]);
133 0 : t = tp[1];
134 0 : tp[1] = tp[2];
135 0 : tp[2] = t;
136 :
137 0 : t = tp[49];
138 0 : tp[49] = tp[50];
139 0 : tp[50] = t;
140 0 : }
141 :
142 : /* taken directly from the 'paper' I'll have a look at it later */
143 : static IDEA_INT inverse(unsigned int xin)
144 : {
145 : long n1, n2, q, r, b1, b2, t;
146 :
147 0 : if (xin == 0)
148 : b2 = 0;
149 : else {
150 : n1 = 0x10001;
151 0 : n2 = xin;
152 : b2 = 1;
153 : b1 = 0;
154 :
155 : do {
156 0 : r = (n1 % n2);
157 0 : q = (n1 - r) / n2;
158 0 : if (r == 0) {
159 0 : if (b2 < 0)
160 0 : b2 = 0x10001 + b2;
161 : } else {
162 : n1 = n2;
163 : n2 = r;
164 : t = b2;
165 0 : b2 = b1 - q * b2;
166 : b1 = t;
167 : }
168 0 : } while (r != 0);
169 : }
170 0 : return ((IDEA_INT) b2);
171 : }
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