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1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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 | * |
58964a49 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 | * |
58964a49 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 | * |
58964a49 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 |
58964a49 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 | * |
58964a49 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 | * |
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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/rc5.h> |
58964a49 RE |
59 | #include "rc5_locl.h" |
60 | ||
1921eaad | 61 | void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data, |
0f113f3e MC |
62 | int rounds) |
63 | { | |
64 | RC5_32_INT L[64], l, ll, A, B, *S, k; | |
65 | int i, j, m, c, t, ii, jj; | |
58964a49 | 66 | |
0f113f3e MC |
67 | if ((rounds != RC5_16_ROUNDS) && |
68 | (rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS)) | |
69 | rounds = RC5_16_ROUNDS; | |
58964a49 | 70 | |
0f113f3e MC |
71 | key->rounds = rounds; |
72 | S = &(key->data[0]); | |
73 | j = 0; | |
74 | for (i = 0; i <= (len - 8); i += 8) { | |
75 | c2l(data, l); | |
76 | L[j++] = l; | |
77 | c2l(data, l); | |
78 | L[j++] = l; | |
79 | } | |
80 | ii = len - i; | |
81 | if (ii) { | |
82 | k = len & 0x07; | |
83 | c2ln(data, l, ll, k); | |
84 | L[j + 0] = l; | |
85 | L[j + 1] = ll; | |
86 | } | |
58964a49 | 87 | |
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88 | c = (len + 3) / 4; |
89 | t = (rounds + 1) * 2; | |
90 | S[0] = RC5_32_P; | |
91 | for (i = 1; i < t; i++) | |
92 | S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK; | |
58964a49 | 93 | |
0f113f3e MC |
94 | j = (t > c) ? t : c; |
95 | j *= 3; | |
96 | ii = jj = 0; | |
97 | A = B = 0; | |
98 | for (i = 0; i < j; i++) { | |
99 | k = (S[ii] + A + B) & RC5_32_MASK; | |
100 | A = S[ii] = ROTATE_l32(k, 3); | |
101 | m = (int)(A + B); | |
102 | k = (L[jj] + A + B) & RC5_32_MASK; | |
103 | B = L[jj] = ROTATE_l32(k, m); | |
104 | if (++ii >= t) | |
105 | ii = 0; | |
106 | if (++jj >= c) | |
107 | jj = 0; | |
108 | } | |
109 | } |