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2039c421 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
d02b48c6 | 3 | * |
aa2d9a76 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
2039c421 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
d02b48c6 RE |
8 | */ |
9 | ||
ec577822 | 10 | #include <openssl/idea.h> |
d02b48c6 RE |
11 | #include "idea_lcl.h" |
12 | ||
d02b48c6 | 13 | static IDEA_INT inverse(unsigned int xin); |
9021a5df | 14 | void IDEA_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) |
0f113f3e MC |
15 | { |
16 | int i; | |
17 | register IDEA_INT *kt, *kf, r0, r1, r2; | |
d02b48c6 | 18 | |
0f113f3e MC |
19 | kt = &(ks->data[0][0]); |
20 | n2s(key, kt[0]); | |
21 | n2s(key, kt[1]); | |
22 | n2s(key, kt[2]); | |
23 | n2s(key, kt[3]); | |
24 | n2s(key, kt[4]); | |
25 | n2s(key, kt[5]); | |
26 | n2s(key, kt[6]); | |
27 | n2s(key, kt[7]); | |
d02b48c6 | 28 | |
0f113f3e MC |
29 | kf = kt; |
30 | kt += 8; | |
31 | for (i = 0; i < 6; i++) { | |
32 | r2 = kf[1]; | |
33 | r1 = kf[2]; | |
34 | *(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff; | |
35 | r0 = kf[3]; | |
36 | *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; | |
37 | r1 = kf[4]; | |
38 | *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; | |
39 | r0 = kf[5]; | |
40 | *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; | |
41 | r1 = kf[6]; | |
42 | *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; | |
43 | r0 = kf[7]; | |
44 | *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; | |
45 | r1 = kf[0]; | |
46 | if (i >= 5) | |
47 | break; | |
48 | *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; | |
49 | *(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff; | |
50 | kf += 8; | |
51 | } | |
52 | } | |
d02b48c6 | 53 | |
9021a5df | 54 | void IDEA_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk) |
0f113f3e MC |
55 | { |
56 | int r; | |
57 | register IDEA_INT *fp, *tp, t; | |
d02b48c6 | 58 | |
0f113f3e MC |
59 | tp = &(dk->data[0][0]); |
60 | fp = &(ek->data[8][0]); | |
61 | for (r = 0; r < 9; r++) { | |
62 | *(tp++) = inverse(fp[0]); | |
63 | *(tp++) = ((int)(0x10000L - fp[2]) & 0xffff); | |
64 | *(tp++) = ((int)(0x10000L - fp[1]) & 0xffff); | |
65 | *(tp++) = inverse(fp[3]); | |
66 | if (r == 8) | |
67 | break; | |
68 | fp -= 6; | |
69 | *(tp++) = fp[4]; | |
70 | *(tp++) = fp[5]; | |
71 | } | |
d02b48c6 | 72 | |
0f113f3e MC |
73 | tp = &(dk->data[0][0]); |
74 | t = tp[1]; | |
75 | tp[1] = tp[2]; | |
76 | tp[2] = t; | |
d02b48c6 | 77 | |
0f113f3e MC |
78 | t = tp[49]; |
79 | tp[49] = tp[50]; | |
80 | tp[50] = t; | |
81 | } | |
d02b48c6 RE |
82 | |
83 | /* taken directly from the 'paper' I'll have a look at it later */ | |
6b691a5c | 84 | static IDEA_INT inverse(unsigned int xin) |
0f113f3e MC |
85 | { |
86 | long n1, n2, q, r, b1, b2, t; | |
d02b48c6 | 87 | |
0f113f3e MC |
88 | if (xin == 0) |
89 | b2 = 0; | |
90 | else { | |
91 | n1 = 0x10001; | |
92 | n2 = xin; | |
93 | b2 = 1; | |
94 | b1 = 0; | |
d02b48c6 | 95 | |
0f113f3e MC |
96 | do { |
97 | r = (n1 % n2); | |
98 | q = (n1 - r) / n2; | |
99 | if (r == 0) { | |
100 | if (b2 < 0) | |
101 | b2 = 0x10001 + b2; | |
102 | } else { | |
103 | n1 = n2; | |
104 | n2 = r; | |
105 | t = b2; | |
106 | b2 = b1 - q * b2; | |
107 | b1 = t; | |
108 | } | |
109 | } while (r != 0); | |
110 | } | |
26a7d938 | 111 | return (IDEA_INT)b2; |
0f113f3e | 112 | } |