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| /*
| * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
| *
| * Licensed under the OpenSSL license (the "License"). You may not use
| * this file except in compliance with the License. You can obtain a copy
| * in the file LICENSE in the source distribution or at
| * https://www.openssl.org/source/license.html
| */
|
| #include <openssl/rc5.h>
| #include "rc5_local.h"
|
| void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,
| int rounds)
| {
| RC5_32_INT L[64], l, ll, A, B, *S, k;
| int i, j, m, c, t, ii, jj;
|
| if ((rounds != RC5_16_ROUNDS) &&
| (rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS))
| rounds = RC5_16_ROUNDS;
|
| key->rounds = rounds;
| S = &(key->data[0]);
| j = 0;
| for (i = 0; i <= (len - 8); i += 8) {
| c2l(data, l);
| L[j++] = l;
| c2l(data, l);
| L[j++] = l;
| }
| ii = len - i;
| if (ii) {
| k = len & 0x07;
| c2ln(data, l, ll, k);
| L[j + 0] = l;
| L[j + 1] = ll;
| }
|
| c = (len + 3) / 4;
| t = (rounds + 1) * 2;
| S[0] = RC5_32_P;
| for (i = 1; i < t; i++)
| S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;
|
| j = (t > c) ? t : c;
| j *= 3;
| ii = jj = 0;
| A = B = 0;
| for (i = 0; i < j; i++) {
| k = (S[ii] + A + B) & RC5_32_MASK;
| A = S[ii] = ROTATE_l32(k, 3);
| m = (int)(A + B);
| k = (L[jj] + A + B) & RC5_32_MASK;
| B = L[jj] = ROTATE_l32(k, m);
| if (++ii >= t)
| ii = 0;
| if (++jj >= c)
| jj = 0;
| }
| }
|
|
