1 /* crypto/des/str2key.c */
\r/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
\r * All rights reserved.
\r *
\r * This package is an SSL implementation written
\r * by Eric Young (eay@mincom.oz.au).
\r * The implementation was written so as to conform with Netscapes SSL.
\r *
\r * This library is free for commercial and non-commercial use as long as
\r * the following conditions are aheared to. The following conditions
\r * apply to all code found in this distribution, be it the RC4, RSA,
\r * lhash, DES, etc., code; not just the SSL code. The SSL documentation
\r * included with this distribution is covered by the same copyright terms
\r * except that the holder is Tim Hudson (tjh@mincom.oz.au).
\r *
\r * Copyright remains Eric Young's, and as such any Copyright notices in
\r * the code are not to be removed.
\r * If this package is used in a product, Eric Young should be given attribution
\r * as the author of the parts of the library used.
\r * This can be in the form of a textual message at program startup or
\r * in documentation (online or textual) provided with the package.
\r *
\r * Redistribution and use in source and binary forms, with or without
\r * modification, are permitted provided that the following conditions
\r * are met:
\r * 1. Redistributions of source code must retain the copyright
\r * notice, this list of conditions and the following disclaimer.
\r * 2. Redistributions in binary form must reproduce the above copyright
\r * notice, this list of conditions and the following disclaimer in the
\r * documentation and/or other materials provided with the distribution.
\r * 3. All advertising materials mentioning features or use of this software
\r * must display the following acknowledgement:
\r * "This product includes cryptographic software written by
\r * Eric Young (eay@mincom.oz.au)"
\r * The word 'cryptographic' can be left out if the rouines from the library
\r * being used are not cryptographic related :-).
\r * 4. If you include any Windows specific code (or a derivative thereof) from
\r * the apps directory (application code) you must include an acknowledgement:
\r * "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
\r *
\r * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
\r * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\r * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\r * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
\r * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\r * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\r * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\r * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\r * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\r * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\r * SUCH DAMAGE.
\r *
\r * The licence and distribution terms for any publically available version or
\r * derivative of this code cannot be changed. i.e. this code cannot simply be
\r * copied and put under another distribution licence
\r * [including the GNU Public Licence.]
\r */
\r\r#include "des_locl.h"
\r\rextern int des_check_key;
\r\rvoid des_string_to_key(str, key)
\rchar *str;
\rdes_cblock (*key);
\r {
\r des_key_schedule ks;
\r int i,length;
\r register unsigned char j;
\r\r memset(key,0,8);
\r length=strlen(str);
\r#ifdef OLD_STR_TO_KEY
\r for (i=0; i<length; i++)
\r (*key)[i%8]^=(str[i]<<1);
\r#else /* MIT COMPATIBLE */
\r for (i=0; i<length; i++)
\r {
\r j=str[i];
\r if ((i%16) < 8)
\r (*key)[i%8]^=(j<<1);
\r else
\r {
\r /* Reverse the bit order 05/05/92 eay */
\r j=((j<<4)&0xf0)|((j>>4)&0x0f);
\r j=((j<<2)&0xcc)|((j>>2)&0x33);
\r j=((j<<1)&0xaa)|((j>>1)&0x55);
\r (*key)[7-(i%8)]^=j;
\r }
\r }
\r#endif
\r des_set_odd_parity((des_cblock *)key);
\r i=des_check_key;
\r des_check_key=0;
\r des_set_key((des_cblock *)key,ks);
\r des_check_key=i;
\r des_cbc_cksum((des_cblock *)str,(des_cblock *)key,(long)length,ks,
\r (des_cblock *)key);
\r memset(ks,0,sizeof(ks));
\r des_set_odd_parity((des_cblock *)key);
\r }
\r\rvoid des_string_to_2keys(str, key1, key2)
\rchar *str;
\rdes_cblock (*key1);
\rdes_cblock (*key2);
\r {
\r des_key_schedule ks;
\r int i,length;
\r register unsigned char j;
\r\r memset(key1,0,8);
\r memset(key2,0,8);
\r length=strlen(str);
\r#ifdef OLD_STR_TO_KEY
\r if (length <= 8)
\r {
\r for (i=0; i<length; i++)
\r {
\r (*key2)[i]=(*key1)[i]=(str[i]<<1);
\r }
\r }
\r else
\r {
\r for (i=0; i<length; i++)
\r {
\r if ((i/8)&1)
\r (*key2)[i%8]^=(str[i]<<1);
\r else
\r (*key1)[i%8]^=(str[i]<<1);
\r }
\r }
\r#else /* MIT COMPATIBLE */
\r for (i=0; i<length; i++)
\r {
\r j=str[i];
\r if ((i%32) < 16)
\r {
\r if ((i%16) < 8)
\r (*key1)[i%8]^=(j<<1);
\r else
\r (*key2)[i%8]^=(j<<1);
\r }
\r else
\r {
\r j=((j<<4)&0xf0)|((j>>4)&0x0f);
\r j=((j<<2)&0xcc)|((j>>2)&0x33);
\r j=((j<<1)&0xaa)|((j>>1)&0x55);
\r if ((i%16) < 8)
\r (*key1)[7-(i%8)]^=j;
\r else
\r (*key2)[7-(i%8)]^=j;
\r }
\r }
\r if (length <= 8) memcpy(key2,key1,8);
\r#endif
\r des_set_odd_parity((des_cblock *)key1);
\r des_set_odd_parity((des_cblock *)key2);
\r i=des_check_key;
\r des_check_key=0;
\r des_set_key((des_cblock *)key1,ks);
\r des_cbc_cksum((des_cblock *)str,(des_cblock *)key1,(long)length,ks,
\r (des_cblock *)key1);
\r des_set_key((des_cblock *)key2,ks);
\r des_cbc_cksum((des_cblock *)str,(des_cblock *)key2,(long)length,ks,
\r (des_cblock *)key2);
\r des_check_key=i;
\r memset(ks,0,sizeof(ks));
\r des_set_odd_parity(key1);
\r des_set_odd_parity(key2);
\r }
\r
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