| /* crypto/rc5/rc5_skey.c */ |
| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| */ |
| |
| #include <openssl/rc5.h> |
| #include "rc5_locl.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; |
| } |
| } |