1 /*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
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
8 */
9
10 #include <openssl/rc5.h>
11 #include "rc5_local.h"
12
RC5_32_set_key(RC5_32_KEY * key,int len,const unsigned char * data,int rounds)13 void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,
14 int rounds)
15 {
16 RC5_32_INT L[64], l, ll, A, B, *S, k;
17 int i, j, m, c, t, ii, jj;
18
19 if ((rounds != RC5_16_ROUNDS) &&
20 (rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS))
21 rounds = RC5_16_ROUNDS;
22
23 key->rounds = rounds;
24 S = &(key->data[0]);
25 j = 0;
26 for (i = 0; i <= (len - 8); i += 8) {
27 c2l(data, l);
28 L[j++] = l;
29 c2l(data, l);
30 L[j++] = l;
31 }
32 ii = len - i;
33 if (ii) {
34 k = len & 0x07;
35 c2ln(data, l, ll, k);
36 L[j + 0] = l;
37 L[j + 1] = ll;
38 }
39
40 c = (len + 3) / 4;
41 t = (rounds + 1) * 2;
42 S[0] = RC5_32_P;
43 for (i = 1; i < t; i++)
44 S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;
45
46 j = (t > c) ? t : c;
47 j *= 3;
48 ii = jj = 0;
49 A = B = 0;
50 for (i = 0; i < j; i++) {
51 k = (S[ii] + A + B) & RC5_32_MASK;
52 A = S[ii] = ROTATE_l32(k, 3);
53 m = (int)(A + B);
54 k = (L[jj] + A + B) & RC5_32_MASK;
55 B = L[jj] = ROTATE_l32(k, m);
56 if (++ii >= t)
57 ii = 0;
58 if (++jj >= c)
59 jj = 0;
60 }
61 }
62