155714Skris/* crypto/rc5/rc5_skey.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280304Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280304Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280304Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280304Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280304Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280304Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <openssl/rc5.h> 6055714Skris#include "rc5_locl.h" 6155714Skris 6268651Skrisvoid RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data, 63280304Sjkim int rounds) 64280304Sjkim{ 65280304Sjkim RC5_32_INT L[64], l, ll, A, B, *S, k; 66280304Sjkim int i, j, m, c, t, ii, jj; 6755714Skris 68280304Sjkim if ((rounds != RC5_16_ROUNDS) && 69280304Sjkim (rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS)) 70280304Sjkim rounds = RC5_16_ROUNDS; 7155714Skris 72280304Sjkim key->rounds = rounds; 73280304Sjkim S = &(key->data[0]); 74280304Sjkim j = 0; 75280304Sjkim for (i = 0; i <= (len - 8); i += 8) { 76280304Sjkim c2l(data, l); 77280304Sjkim L[j++] = l; 78280304Sjkim c2l(data, l); 79280304Sjkim L[j++] = l; 80280304Sjkim } 81280304Sjkim ii = len - i; 82280304Sjkim if (ii) { 83280304Sjkim k = len & 0x07; 84280304Sjkim c2ln(data, l, ll, k); 85280304Sjkim L[j + 0] = l; 86280304Sjkim L[j + 1] = ll; 87280304Sjkim } 8855714Skris 89280304Sjkim c = (len + 3) / 4; 90280304Sjkim t = (rounds + 1) * 2; 91280304Sjkim S[0] = RC5_32_P; 92280304Sjkim for (i = 1; i < t; i++) 93280304Sjkim S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK; 9455714Skris 95280304Sjkim j = (t > c) ? t : c; 96280304Sjkim j *= 3; 97280304Sjkim ii = jj = 0; 98280304Sjkim A = B = 0; 99280304Sjkim for (i = 0; i < j; i++) { 100280304Sjkim k = (S[ii] + A + B) & RC5_32_MASK; 101280304Sjkim A = S[ii] = ROTATE_l32(k, 3); 102280304Sjkim m = (int)(A + B); 103280304Sjkim k = (L[jj] + A + B) & RC5_32_MASK; 104280304Sjkim B = L[jj] = ROTATE_l32(k, m); 105280304Sjkim if (++ii >= t) 106280304Sjkim ii = 0; 107280304Sjkim if (++jj >= c) 108280304Sjkim jj = 0; 109280304Sjkim } 110280304Sjkim} 111