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 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