lib/lwip/src/netif/ppp/chpms.c - kernel/lk - Gitiles

 /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
 /*****************************************************************************
 * chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
 *
 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
 * Copyright (c) 1997 by Global Election Systems Inc.  All rights reserved.
 *
 * The authors hereby grant permission to use, copy, modify, distribute,
 * and license this software and its documentation for any purpose, provided
 * that existing copyright notices are retained in all copies and that this
 * notice and the following disclaimer are included verbatim in any
 * distributions. No written agreement, license, or royalty fee is required
 * for any of the authorized uses.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *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 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.
 *
 ******************************************************************************
 * REVISION HISTORY
 *
 * 03-01-01 Marc Boucher <marc@mbsi.ca>
 *   Ported to lwIP.
 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
 *	Original based on BSD chap_ms.c.
 *****************************************************************************/
 /*
  * chap_ms.c - Microsoft MS-CHAP compatible implementation.
  *
  * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
  * http://www.strataware.com/
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms are permitted
  * provided that the above copyright notice and this paragraph are
  * duplicated in all such forms and that any documentation,
  * advertising materials, and other materials related to such
  * distribution and use acknowledge that the software was developed
  * by Eric Rosenquist.  The name of the author may not be used to
  * endorse or promote products derived from this software without
  * specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */

 /*
  * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
  *
  *   Implemented LANManager type password response to MS-CHAP challenges.
  *   Now pppd provides both NT style and LANMan style blocks, and the
  *   prefered is set by option "ms-lanman". Default is to use NT.
  *   The hash text (StdText) was taken from Win95 RASAPI32.DLL.
  *
  *   You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
  */

 #define USE_CRYPT


 #include "ppp.h"

 #if MSCHAP_SUPPORT > 0

 #include "md4.h"
 #ifndef USE_CRYPT
 #include "des.h"
 #endif
 #include "chap.h"
 #include "chpms.h"
 #include "pppdebug.h"


 /*************************/
 /*** LOCAL DEFINITIONS ***/
 /*************************/


 /************************/
 /*** LOCAL DATA TYPES ***/
 /************************/
 typedef struct {
     u_char LANManResp[24];
     u_char NTResp[24];
     u_char UseNT;		/* If 1, ignore the LANMan response field */
 } MS_ChapResponse;
 /* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
    in case this struct gets padded. */


 /***********************************/
 /*** LOCAL FUNCTION DECLARATIONS ***/
 /***********************************/

 /* XXX Don't know what to do with these. */
 extern void setkey(const char *);
 extern void encrypt(char *, int);

 static void	DesEncrypt (u_char *, u_char *, u_char *);
 static void	MakeKey (u_char *, u_char *);

 #ifdef USE_CRYPT
 static void	Expand (u_char *, u_char *);
 static void	Collapse (u_char *, u_char *);
 #endif

 static void ChallengeResponse(
 	u_char *challenge,	/* IN   8 octets */
 	u_char *pwHash,		/* IN  16 octets */
 	u_char *response	/* OUT 24 octets */
 );
 static void ChapMS_NT(
 	char *rchallenge,
 	int rchallenge_len,
 	char *secret,
 	int secret_len,
 	MS_ChapResponse *response
 );
 static u_char Get7Bits(
 	u_char *input,
 	int startBit
 );


 /***********************************/
 /*** PUBLIC FUNCTION DEFINITIONS ***/
 /***********************************/
 void ChapMS(
 	chap_state *cstate,
 	char *rchallenge,
 	int rchallenge_len,
 	char *secret,
 	int secret_len
 )
 {
 	MS_ChapResponse	response;
 #ifdef MSLANMAN
 	extern int ms_lanman;
 #endif

 #if 0
 	CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'\n", secret_len, secret));
 #endif
 	BZERO(&response, sizeof(response));

 	/* Calculate both always */
 	ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);

 #ifdef MSLANMAN
 	ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);

 	/* prefered method is set by option  */
 	response.UseNT = !ms_lanman;
 #else
 	response.UseNT = 1;
 #endif

 	BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
 	cstate->resp_length = MS_CHAP_RESPONSE_LEN;
 }


 /**********************************/
 /*** LOCAL FUNCTION DEFINITIONS ***/
 /**********************************/
 static void ChallengeResponse(
 	u_char *challenge,	/* IN   8 octets */
 	u_char *pwHash,		/* IN  16 octets */
 	u_char *response	/* OUT 24 octets */
 )
 {
 	char    ZPasswordHash[21];

 	BZERO(ZPasswordHash, sizeof(ZPasswordHash));
 	BCOPY(pwHash, ZPasswordHash, 16);

 #if 0
 	log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
 #endif

 	DesEncrypt(challenge, ZPasswordHash +  0, response + 0);
 	DesEncrypt(challenge, ZPasswordHash +  7, response + 8);
 	DesEncrypt(challenge, ZPasswordHash + 14, response + 16);

 #if 0
 	log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
 #endif
 }


 #ifdef USE_CRYPT
 static void DesEncrypt(
 	u_char *clear,	/* IN  8 octets */
 	u_char *key,	/* IN  7 octets */
 	u_char *cipher	/* OUT 8 octets */
 )
 {
 	u_char des_key[8];
 	u_char crypt_key[66];
 	u_char des_input[66];

 	MakeKey(key, des_key);

 	Expand(des_key, crypt_key);
 	setkey(crypt_key);

 #if 0
 	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
 	       clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
 #endif

 	Expand(clear, des_input);
 	encrypt(des_input, 0);
 	Collapse(des_input, cipher);

 #if 0
 	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 	       cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
 #endif
 }

 #else /* USE_CRYPT */

 static void DesEncrypt(
 	u_char *clear,	/* IN  8 octets */
 	u_char *key,	/* IN  7 octets */
 	u_char *cipher	/* OUT 8 octets */
 )
 {
 	des_cblock		des_key;
 	des_key_schedule	key_schedule;

 	MakeKey(key, des_key);

 	des_set_key(&des_key, key_schedule);

 #if 0
 	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
 	       clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
 #endif

 	des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);

 #if 0
 	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 	       cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
 #endif
 }

 #endif /* USE_CRYPT */


 static u_char Get7Bits(
 	u_char *input,
 	int startBit
 )
 {
 	register unsigned int	word;

 	word  = (unsigned)input[startBit / 8] << 8;
 	word |= (unsigned)input[startBit / 8 + 1];

 	word >>= 15 - (startBit % 8 + 7);

 	return word & 0xFE;
 }

 #ifdef USE_CRYPT

 /* in == 8-byte string (expanded version of the 56-bit key)
  * out == 64-byte string where each byte is either 1 or 0
  * Note that the low-order "bit" is always ignored by by setkey()
  */
 static void Expand(u_char *in, u_char *out)
 {
 	int j, c;
 	int i;

 	for(i = 0; i < 64; in++){
 		c = *in;
 		for(j = 7; j >= 0; j--)
 			*out++ = (c >> j) & 01;
 		i += 8;
 	}
 }

 /* The inverse of Expand
  */
 static void Collapse(u_char *in, u_char *out)
 {
 	int j;
 	int i;
 	unsigned int c;

 	for (i = 0; i < 64; i += 8, out++) {
 		c = 0;
 		for (j = 7; j >= 0; j--, in++)
 			c |= *in << j;
 		*out = c & 0xff;
 	}
 }
 #endif

 static void MakeKey(
 	u_char *key,		/* IN  56 bit DES key missing parity bits */
 	u_char *des_key		/* OUT 64 bit DES key with parity bits added */
 )
 {
 	des_key[0] = Get7Bits(key,  0);
 	des_key[1] = Get7Bits(key,  7);
 	des_key[2] = Get7Bits(key, 14);
 	des_key[3] = Get7Bits(key, 21);
 	des_key[4] = Get7Bits(key, 28);
 	des_key[5] = Get7Bits(key, 35);
 	des_key[6] = Get7Bits(key, 42);
 	des_key[7] = Get7Bits(key, 49);

 #ifndef USE_CRYPT
 	des_set_odd_parity((des_cblock *)des_key);
 #endif

 #if 0
 	CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
 	       key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
 	CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 	       des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
 #endif
 }

 static void ChapMS_NT(
 	char *rchallenge,
 	int rchallenge_len,
 	char *secret,
 	int secret_len,
 	MS_ChapResponse *response
 )
 {
 	int			i;
 	MDstruct	md4Context;
 	u_char		unicodePassword[MAX_NT_PASSWORD * 2];
 	static int	low_byte_first = -1;

 	/* Initialize the Unicode version of the secret (== password). */
 	/* This implicitly supports 8-bit ISO8859/1 characters. */
 	BZERO(unicodePassword, sizeof(unicodePassword));
 	for (i = 0; i < secret_len; i++)
 		unicodePassword[i * 2] = (u_char)secret[i];

 	MDbegin(&md4Context);
 	MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8);	/* Unicode is 2 bytes/char, *8 for bit count */

 	if (low_byte_first == -1)
 		low_byte_first = (htons((unsigned short int)1) != 1);
 	if (low_byte_first == 0)
 		MDreverse((u_long *)&md4Context);  /*  sfb 961105 */

 	MDupdate(&md4Context, NULL, 0);	/* Tell MD4 we're done */

 	ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);
 }

 #ifdef MSLANMAN
 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */

 static ChapMS_LANMan(
 	char *rchallenge,
 	int rchallenge_len,
 	char *secret,
 	int secret_len,
 	MS_ChapResponse	*response
 )
 {
 	int			i;
 	u_char		UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
 	u_char		PasswordHash[16];

 	/* LANMan password is case insensitive */
 	BZERO(UcasePassword, sizeof(UcasePassword));
 	for (i = 0; i < secret_len; i++)
 		UcasePassword[i] = (u_char)toupper(secret[i]);
 	DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
 	DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
 	ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
 }
 #endif

 #endif /* MSCHAP_SUPPORT */
	/* WARNING - THIS CODE HAS NOT BEEN FINISHED! */
	/*****************************************************************************
	* chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
	*
	* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
	* Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
	*
	* The authors hereby grant permission to use, copy, modify, distribute,
	* and license this software and its documentation for any purpose, provided
	* that existing copyright notices are retained in all copies and that this
	* notice and the following disclaimer are included verbatim in any
	* distributions. No written agreement, license, or royalty fee is required
	* for any of the authorized uses.
	*
	* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS 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 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.
	*
	******************************************************************************
	* REVISION HISTORY
	*
	* 03-01-01 Marc Boucher <marc@mbsi.ca>
	* Ported to lwIP.
	* 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
	* Original based on BSD chap_ms.c.
	*****************************************************************************/
	/*
	* chap_ms.c - Microsoft MS-CHAP compatible implementation.
	*
	* Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
	* http://www.strataware.com/
	*
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms are permitted
	* provided that the above copyright notice and this paragraph are
	* duplicated in all such forms and that any documentation,
	* advertising materials, and other materials related to such
	* distribution and use acknowledge that the software was developed
	* by Eric Rosenquist. The name of the author may not be used to
	* endorse or promote products derived from this software without
	* specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	*/

	/*
	* Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
	*
	* Implemented LANManager type password response to MS-CHAP challenges.
	* Now pppd provides both NT style and LANMan style blocks, and the
	* prefered is set by option "ms-lanman". Default is to use NT.
	* The hash text (StdText) was taken from Win95 RASAPI32.DLL.
	*
	* You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
	*/

	#define USE_CRYPT


	#include "ppp.h"

	#if MSCHAP_SUPPORT > 0

	#include "md4.h"
	#ifndef USE_CRYPT
	#include "des.h"
	#endif
	#include "chap.h"
	#include "chpms.h"
	#include "pppdebug.h"


	/*************************/
	/* LOCAL DEFINITIONS */
	/*************************/


	/************************/
	/* LOCAL DATA TYPES */
	/************************/
	typedef struct {
	u_char LANManResp[24];
	u_char NTResp[24];
	u_char UseNT; /* If 1, ignore the LANMan response field */
	} MS_ChapResponse;
	/* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
	in case this struct gets padded. */



	/***********************************/
	/* LOCAL FUNCTION DECLARATIONS */
	/***********************************/

	/* XXX Don't know what to do with these. */
	extern void setkey(const char *);
	extern void encrypt(char *, int);

	static void DesEncrypt (u_char , u_char , u_char *);
	static void MakeKey (u_char , u_char );

	#ifdef USE_CRYPT
	static void Expand (u_char , u_char );
	static void Collapse (u_char , u_char );
	#endif

	static void ChallengeResponse(
	u_char challenge, / IN 8 octets */
	u_char pwHash, / IN 16 octets */
	u_char response / OUT 24 octets */
	);
	static void ChapMS_NT(
	char *rchallenge,
	int rchallenge_len,
	char *secret,
	int secret_len,
	MS_ChapResponse *response
	);
	static u_char Get7Bits(
	u_char *input,
	int startBit
	);


	/***********************************/
	/* PUBLIC FUNCTION DEFINITIONS */
	/***********************************/
	void ChapMS(
	chap_state *cstate,
	char *rchallenge,
	int rchallenge_len,
	char *secret,
	int secret_len
	)
	{
	MS_ChapResponse response;
	#ifdef MSLANMAN
	extern int ms_lanman;
	#endif

	#if 0
	CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'\n", secret_len, secret));
	#endif
	BZERO(&response, sizeof(response));

	/* Calculate both always */
	ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);

	#ifdef MSLANMAN
	ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);

	/* prefered method is set by option */
	response.UseNT = !ms_lanman;
	#else
	response.UseNT = 1;
	#endif

	BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
	cstate->resp_length = MS_CHAP_RESPONSE_LEN;
	}


	/**********************************/
	/* LOCAL FUNCTION DEFINITIONS */
	/**********************************/
	static void ChallengeResponse(
	u_char challenge, / IN 8 octets */
	u_char pwHash, / IN 16 octets */
	u_char response / OUT 24 octets */
	)
	{
	char ZPasswordHash[21];

	BZERO(ZPasswordHash, sizeof(ZPasswordHash));
	BCOPY(pwHash, ZPasswordHash, 16);

	#if 0
	log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
	#endif

	DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
	DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
	DesEncrypt(challenge, ZPasswordHash + 14, response + 16);

	#if 0
	log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
	#endif
	}


	#ifdef USE_CRYPT
	static void DesEncrypt(
	u_char clear, / IN 8 octets */
	u_char key, / IN 7 octets */
	u_char cipher / OUT 8 octets */
	)
	{
	u_char des_key[8];
	u_char crypt_key[66];
	u_char des_input[66];

	MakeKey(key, des_key);

	Expand(des_key, crypt_key);
	setkey(crypt_key);

	#if 0
	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
	clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
	#endif

	Expand(clear, des_input);
	encrypt(des_input, 0);
	Collapse(des_input, cipher);

	#if 0
	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
	cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
	#endif
	}

	#else /* USE_CRYPT */

	static void DesEncrypt(
	u_char clear, / IN 8 octets */
	u_char key, / IN 7 octets */
	u_char cipher / OUT 8 octets */
	)
	{
	des_cblock des_key;
	des_key_schedule key_schedule;

	MakeKey(key, des_key);

	des_set_key(&des_key, key_schedule);

	#if 0
	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
	clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
	#endif

	des_ecb_encrypt((des_cblock )clear, (des_cblock )cipher, key_schedule, 1);

	#if 0
	CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
	cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
	#endif
	}

	#endif /* USE_CRYPT */


	static u_char Get7Bits(
	u_char *input,
	int startBit
	)
	{
	register unsigned int word;

	word = (unsigned)input[startBit / 8] << 8;
	word \|= (unsigned)input[startBit / 8 + 1];

	word >>= 15 - (startBit % 8 + 7);

	return word & 0xFE;
	}

	#ifdef USE_CRYPT

	/* in == 8-byte string (expanded version of the 56-bit key)
	* out == 64-byte string where each byte is either 1 or 0
	* Note that the low-order "bit" is always ignored by by setkey()
	*/
	static void Expand(u_char in, u_char out)
	{
	int j, c;
	int i;

	for(i = 0; i < 64; in++){
	c = *in;
	for(j = 7; j >= 0; j--)
	*out++ = (c >> j) & 01;
	i += 8;
	}
	}

	/* The inverse of Expand
	*/
	static void Collapse(u_char in, u_char out)
	{
	int j;
	int i;
	unsigned int c;

	for (i = 0; i < 64; i += 8, out++) {
	c = 0;
	for (j = 7; j >= 0; j--, in++)
	c \|= *in << j;
	*out = c & 0xff;
	}
	}
	#endif

	static void MakeKey(
	u_char key, / IN 56 bit DES key missing parity bits */
	u_char des_key / OUT 64 bit DES key with parity bits added */
	)
	{
	des_key[0] = Get7Bits(key, 0);
	des_key[1] = Get7Bits(key, 7);
	des_key[2] = Get7Bits(key, 14);
	des_key[3] = Get7Bits(key, 21);
	des_key[4] = Get7Bits(key, 28);
	des_key[5] = Get7Bits(key, 35);
	des_key[6] = Get7Bits(key, 42);
	des_key[7] = Get7Bits(key, 49);

	#ifndef USE_CRYPT
	des_set_odd_parity((des_cblock *)des_key);
	#endif

	#if 0
	CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
	key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
	CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
	des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
	#endif
	}

	static void ChapMS_NT(
	char *rchallenge,
	int rchallenge_len,
	char *secret,
	int secret_len,
	MS_ChapResponse *response
	)
	{
	int i;
	MDstruct md4Context;
	u_char unicodePassword[MAX_NT_PASSWORD * 2];
	static int low_byte_first = -1;

	/* Initialize the Unicode version of the secret (== password). */
	/* This implicitly supports 8-bit ISO8859/1 characters. */
	BZERO(unicodePassword, sizeof(unicodePassword));
	for (i = 0; i < secret_len; i++)
	unicodePassword[i * 2] = (u_char)secret[i];

	MDbegin(&md4Context);
	MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, 8 for bit count /

	if (low_byte_first == -1)
	low_byte_first = (htons((unsigned short int)1) != 1);
	if (low_byte_first == 0)
	MDreverse((u_long )&md4Context); / sfb 961105 */

	MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */

	ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);
	}

	#ifdef MSLANMAN
	static u_char StdText = (u_char )"KGS!@#$%"; /* key from rasapi32.dll */

	static ChapMS_LANMan(
	char *rchallenge,
	int rchallenge_len,
	char *secret,
	int secret_len,
	MS_ChapResponse *response
	)
	{
	int i;
	u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
	u_char PasswordHash[16];

	/* LANMan password is case insensitive */
	BZERO(UcasePassword, sizeof(UcasePassword));
	for (i = 0; i < secret_len; i++)
	UcasePassword[i] = (u_char)toupper(secret[i]);
	DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
	DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
	ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
	}
	#endif

	#endif /* MSCHAP_SUPPORT */