1 /*
2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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 /*
11 * RC5 low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <openssl/rc5.h>
17 #include "rc5_local.h"
18
RC5_32_set_key(RC5_32_KEY * key,int len,const unsigned char * data,int rounds)19 int RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,
20 int rounds)
21 {
22 RC5_32_INT L[64], l, ll, A, B, *S, k;
23 int i, j, m, c, t, ii, jj;
24
25 if (len > 255)
26 return 0;
27
28 if ((rounds != RC5_16_ROUNDS) &&
29 (rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS))
30 rounds = RC5_16_ROUNDS;
31
32 key->rounds = rounds;
33 S = &(key->data[0]);
34 j = 0;
35 for (i = 0; i <= (len - 8); i += 8) {
36 c2l(data, l);
37 L[j++] = l;
38 c2l(data, l);
39 L[j++] = l;
40 }
41 ii = len - i;
42 if (ii) {
43 k = len & 0x07;
44 c2ln(data, l, ll, k);
45 L[j + 0] = l;
46 L[j + 1] = ll;
47 }
48
49 c = (len + 3) / 4;
50 t = (rounds + 1) * 2;
51 S[0] = RC5_32_P;
52 for (i = 1; i < t; i++)
53 S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;
54
55 j = (t > c) ? t : c;
56 j *= 3;
57 ii = jj = 0;
58 A = B = 0;
59 for (i = 0; i < j; i++) {
60 k = (S[ii] + A + B) & RC5_32_MASK;
61 A = S[ii] = ROTATE_l32(k, 3);
62 m = (int)(A + B);
63 k = (L[jj] + A + B) & RC5_32_MASK;
64 B = L[jj] = ROTATE_l32(k, m);
65 if (++ii >= t)
66 ii = 0;
67 if (++jj >= c)
68 jj = 0;
69 }
70
71 return 1;
72 }
73
