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58964a49 | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
2 | * All rights reserved. |
3 | * | |
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. | |
0f113f3e | 7 | * |
d02b48c6 RE |
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). | |
0f113f3e | 14 | * |
d02b48c6 RE |
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. | |
0f113f3e | 21 | * |
d02b48c6 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
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 :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
d02b48c6 RE |
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 | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
d02b48c6 RE |
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.] | |
56 | */ | |
57 | ||
ec577822 | 58 | #include <openssl/idea.h> |
d02b48c6 RE |
59 | #include "idea_lcl.h" |
60 | ||
d02b48c6 | 61 | static IDEA_INT inverse(unsigned int xin); |
1921eaad | 62 | void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) |
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63 | { |
64 | int i; | |
65 | register IDEA_INT *kt, *kf, r0, r1, r2; | |
d02b48c6 | 66 | |
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67 | kt = &(ks->data[0][0]); |
68 | n2s(key, kt[0]); | |
69 | n2s(key, kt[1]); | |
70 | n2s(key, kt[2]); | |
71 | n2s(key, kt[3]); | |
72 | n2s(key, kt[4]); | |
73 | n2s(key, kt[5]); | |
74 | n2s(key, kt[6]); | |
75 | n2s(key, kt[7]); | |
d02b48c6 | 76 | |
0f113f3e MC |
77 | kf = kt; |
78 | kt += 8; | |
79 | for (i = 0; i < 6; i++) { | |
80 | r2 = kf[1]; | |
81 | r1 = kf[2]; | |
82 | *(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff; | |
83 | r0 = kf[3]; | |
84 | *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; | |
85 | r1 = kf[4]; | |
86 | *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; | |
87 | r0 = kf[5]; | |
88 | *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; | |
89 | r1 = kf[6]; | |
90 | *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; | |
91 | r0 = kf[7]; | |
92 | *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; | |
93 | r1 = kf[0]; | |
94 | if (i >= 5) | |
95 | break; | |
96 | *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; | |
97 | *(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff; | |
98 | kf += 8; | |
99 | } | |
100 | } | |
d02b48c6 | 101 | |
6b691a5c | 102 | void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk) |
0f113f3e MC |
103 | { |
104 | int r; | |
105 | register IDEA_INT *fp, *tp, t; | |
d02b48c6 | 106 | |
0f113f3e MC |
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]); | |
114 | if (r == 8) | |
115 | break; | |
116 | fp -= 6; | |
117 | *(tp++) = fp[4]; | |
118 | *(tp++) = fp[5]; | |
119 | } | |
d02b48c6 | 120 | |
0f113f3e MC |
121 | tp = &(dk->data[0][0]); |
122 | t = tp[1]; | |
123 | tp[1] = tp[2]; | |
124 | tp[2] = t; | |
d02b48c6 | 125 | |
0f113f3e MC |
126 | t = tp[49]; |
127 | tp[49] = tp[50]; | |
128 | tp[50] = t; | |
129 | } | |
d02b48c6 RE |
130 | |
131 | /* taken directly from the 'paper' I'll have a look at it later */ | |
6b691a5c | 132 | static IDEA_INT inverse(unsigned int xin) |
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133 | { |
134 | long n1, n2, q, r, b1, b2, t; | |
d02b48c6 | 135 | |
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136 | if (xin == 0) |
137 | b2 = 0; | |
138 | else { | |
139 | n1 = 0x10001; | |
140 | n2 = xin; | |
141 | b2 = 1; | |
142 | b1 = 0; | |
d02b48c6 | 143 | |
0f113f3e MC |
144 | do { |
145 | r = (n1 % n2); | |
146 | q = (n1 - r) / n2; | |
147 | if (r == 0) { | |
148 | if (b2 < 0) | |
149 | b2 = 0x10001 + b2; | |
150 | } else { | |
151 | n1 = n2; | |
152 | n2 = r; | |
153 | t = b2; | |
154 | b2 = b1 - q * b2; | |
155 | b1 = t; | |
156 | } | |
157 | } while (r != 0); | |
158 | } | |
159 | return ((IDEA_INT) b2); | |
160 | } |