/* 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);

	}