1 /* crypto/rc5/rc5_skey.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <openssl/rc5.h> 60 #include "rc5_locl.h" 61 62 void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data, 63 int rounds) 64 { 65 RC5_32_INT L[64],l,ll,A,B,*S,k; 66 int i,j,m,c,t,ii,jj; 67 68 if ( (rounds != RC5_16_ROUNDS) && 69 (rounds != RC5_12_ROUNDS) && 70 (rounds != RC5_8_ROUNDS)) 71 rounds=RC5_16_ROUNDS; 72 73 key->rounds=rounds; 74 S= &(key->data[0]); 75 j=0; 76 for (i=0; i<=(len-8); i+=8) 77 { 78 c2l(data,l); 79 L[j++]=l; 80 c2l(data,l); 81 L[j++]=l; 82 } 83 ii=len-i; 84 if (ii) 85 { 86 k=len&0x07; 87 c2ln(data,l,ll,k); 88 L[j+0]=l; 89 L[j+1]=ll; 90 } 91 92 c=(len+3)/4; 93 t=(rounds+1)*2; 94 S[0]=RC5_32_P; 95 for (i=1; i<t; i++) 96 S[i]=(S[i-1]+RC5_32_Q)&RC5_32_MASK; 97 98 j=(t>c)?t:c; 99 j*=3; 100 ii=jj=0; 101 A=B=0; 102 for (i=0; i<j; i++) 103 { 104 k=(S[ii]+A+B)&RC5_32_MASK; 105 A=S[ii]=ROTATE_l32(k,3); 106 m=(int)(A+B); 107 k=(L[jj]+A+B)&RC5_32_MASK; 108 B=L[jj]=ROTATE_l32(k,m); 109 if (++ii >= t) ii=0; 110 if (++jj >= c) jj=0; 111 } 112 } 113 114