rc5_skey.c revision 55714
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. 855714Skris * 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). 1555714Skris * 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. 2255714Skris * 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 :-). 3755714Skris * 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)" 4055714Skris * 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. 5255714Skris * 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 6255714Skrisvoid RC5_32_set_key(RC5_32_KEY *key, int len, unsigned char *data, 6355714Skris int rounds) 6455714Skris { 6555714Skris RC5_32_INT L[64],l,ll,A,B,*S,k; 6655714Skris int i,j,m,c,t,ii,jj; 6755714Skris 6855714Skris if ( (rounds != RC5_16_ROUNDS) && 6955714Skris (rounds != RC5_12_ROUNDS) && 7055714Skris (rounds != RC5_8_ROUNDS)) 7155714Skris rounds=RC5_16_ROUNDS; 7255714Skris 7355714Skris key->rounds=rounds; 7455714Skris S= &(key->data[0]); 7555714Skris j=0; 7655714Skris for (i=0; i<=(len-8); i+=8) 7755714Skris { 7855714Skris c2l(data,l); 7955714Skris L[j++]=l; 8055714Skris c2l(data,l); 8155714Skris L[j++]=l; 8255714Skris } 8355714Skris ii=len-i; 8455714Skris if (ii) 8555714Skris { 8655714Skris k=len&0x07; 8755714Skris c2ln(data,l,ll,k); 8855714Skris L[j+0]=l; 8955714Skris L[j+1]=ll; 9055714Skris } 9155714Skris 9255714Skris c=(len+3)/4; 9355714Skris t=(rounds+1)*2; 9455714Skris S[0]=RC5_32_P; 9555714Skris for (i=1; i<t; i++) 9655714Skris S[i]=(S[i-1]+RC5_32_Q)&RC5_32_MASK; 9755714Skris 9855714Skris j=(t>c)?t:c; 9955714Skris j*=3; 10055714Skris ii=jj=0; 10155714Skris A=B=0; 10255714Skris for (i=0; i<j; i++) 10355714Skris { 10455714Skris k=(S[ii]+A+B)&RC5_32_MASK; 10555714Skris A=S[ii]=ROTATE_l32(k,3); 10655714Skris m=(int)(A+B); 10755714Skris k=(L[jj]+A+B)&RC5_32_MASK; 10855714Skris B=L[jj]=ROTATE_l32(k,m); 10955714Skris if (++ii >= t) ii=0; 11055714Skris if (++jj >= c) jj=0; 11155714Skris } 11255714Skris } 11355714Skris 114