/* crypto/des/str2key.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 "des_locl.h"

 #include <openssl/crypto.h>

 EXPORT_C void DES_string_to_key(const char *str, DES_cblock *key)

 	{

 	DES_key_schedule ks;

 	int i,length;

 	register unsigned char j;

 	memset(key,0,8);

 	length=strlen(str);

 #ifdef OLD_STR_TO_KEY

 	for (i=0; i<length; i++)

 		(*key)[i%8]^=(str[i]<<1);

 #else /* MIT COMPATIBLE */

 	for (i=0; i<length; i++)

 		{

 		j=str[i];

 		if ((i%16) < 8)

 			(*key)[i%8]^=(j<<1);

 		else

 			{

 			/* Reverse the bit order 05/05/92 eay */

 			j=((j<<4)&0xf0)|((j>>4)&0x0f);

 			j=((j<<2)&0xcc)|((j>>2)&0x33);

 			j=((j<<1)&0xaa)|((j>>1)&0x55);

 			(*key)[7-(i%8)]^=j;

 			}

 		}

 #endif

 	DES_set_odd_parity(key);

 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY

 	if(DES_is_weak_key(key))

 	    (*key)[7] ^= 0xF0;

 	DES_set_key(key,&ks);

 #else

 	DES_set_key_unchecked(key,&ks);

 #endif

 	DES_cbc_cksum((const unsigned char*)str,key,length,&ks,key);

 	OPENSSL_cleanse(&ks,sizeof(ks));

 	DES_set_odd_parity(key);

 	}

 EXPORT_C void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)

 	{

 	DES_key_schedule ks;

 	int i,length;

 	register unsigned char j;

 	memset(key1,0,8);

 	memset(key2,0,8);

 	length=strlen(str);

 #ifdef OLD_STR_TO_KEY

 	if (length <= 8)

 		{

 		for (i=0; i<length; i++)

 			{

 			(*key2)[i]=(*key1)[i]=(str[i]<<1);

 			}

 		}

 	else

 		{

 		for (i=0; i<length; i++)

 			{

 			if ((i/8)&1)

 				(*key2)[i%8]^=(str[i]<<1);

 			else

 				(*key1)[i%8]^=(str[i]<<1);

 			}

 		}

 #else /* MIT COMPATIBLE */

 	for (i=0; i<length; i++)

 		{

 		j=str[i];

 		if ((i%32) < 16)

 			{

 			if ((i%16) < 8)

 				(*key1)[i%8]^=(j<<1);

 			else

 				(*key2)[i%8]^=(j<<1);

 			}

 		else

 			{

 			j=((j<<4)&0xf0)|((j>>4)&0x0f);

 			j=((j<<2)&0xcc)|((j>>2)&0x33);

 			j=((j<<1)&0xaa)|((j>>1)&0x55);

 			if ((i%16) < 8)

 				(*key1)[7-(i%8)]^=j;

 			else

 				(*key2)[7-(i%8)]^=j;

 			}

 		}

 	if (length <= 8) memcpy(key2,key1,8);

 #endif

 	DES_set_odd_parity(key1);

 	DES_set_odd_parity(key2);

 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY

 	if(DES_is_weak_key(key1))

 	    (*key1)[7] ^= 0xF0;

 	DES_set_key(key1,&ks);

 #else

 	DES_set_key_unchecked(key1,&ks);

 #endif

 	DES_cbc_cksum((const unsigned char*)str,key1,length,&ks,key1);

 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY

 	if(DES_is_weak_key(key2))

 	    (*key2)[7] ^= 0xF0;

 	DES_set_key(key2,&ks);

 #else

 	DES_set_key_unchecked(key2,&ks);

 #endif

 	DES_cbc_cksum((const unsigned char*)str,key2,length,&ks,key2);

 	OPENSSL_cleanse(&ks,sizeof(ks));

 	DES_set_odd_parity(key1);

 	DES_set_odd_parity(key2);

 	}