/*************************************************
*     Exim - an Internet mail transport agent    *
*************************************************/

/*
 * This file provides the necessary methods for authenticating with
 * Microsoft's Secure Password Authentication.

 * All the original code used here was torn by Marc Prud'hommeaux out of the
 * Samba project (by Andrew Tridgell, Jeremy Allison, and others).

 * Tom Kistner provided additional code, adding spa_build_auth_challenge() to
 * support server authentication mode.

 * References:
 * http://www.innovation.ch/java/ntlm.html
 * http://www.kuro5hin.org/story/2002/4/28/1436/66154

 * It seems that some systems have existing but different definitions of some
 * of the following types. I received a complaint about "int16" causing
 * compilation problems. So I (PH) have renamed them all, to be on the safe
 * side, by adding 'x' on the end.

 * typedef signed short int16;
 * typedef unsigned short uint16;
 * typedef unsigned uint32;
 * typedef unsigned char  uint8;

 * The API is extremely simple:
 * 1. Form a SPA authentication request based on the username
 *    and (optional) domain
 * 2. Send the request to the server and get an SPA challenge
 * 3. Build the challenge response and send it back.
 *
 * Example usage is as
 * follows:
 *
int main (int argc, char ** argv)
{
       SPAAuthRequest	request;
       SPAAuthChallenge challenge;
       SPAAuthResponse	response;
       char msgbuf[2048];
       char buffer[512];
       char *username, *password, *domain, *challenge_str;

       if (argc < 3)
       {
	       printf ("Usage: %s <username> <password> [SPA Challenge]\n",
		       argv [0]);
	       exit (1);
       }

       username = argv [1];
       password = argv [2];
       domain = 0;

       spa_build_auth_request (&request, username, domain);

       spa_bits_to_base64 (msgbuf, (unsigned char*)&request,
	       spa_request_length(&request));

       printf ("SPA Login request for username=%s:\n   %s\n",
	       argv [1], msgbuf);

       if (argc < 4)
       {
	       printf ("Run: %s <username> <password> [NTLM Challenge] " \
		       "to complete authenitcation\n", argv [0]);
	       exit (0);
       }

       challenge_str = argv [3];

       spa_build_auth_response (&challenge, &response, username, password);
       spa_bits_to_base64 (msgbuf, (unsigned char*)&response,
	       spa_request_length(&response));

       printf ("SPA Response to challenge:\n   %s\n for " \
	       "username=%s, password=%s:\n   %s\n",
	       argv[3], argv [1], argv [2], msgbuf);
       return 0;
}
 *
 *
 * All the client code used here was torn by Marc Prud'hommeaux out of the
 * Samba project (by Andrew Tridgell, Jeremy Allison, and others).
 * Previous comments are below:
 */

/*
   Unix SMB/Netbios implementation.
   Version 1.9.

   a partial implementation of DES designed for use in the
   SMB authentication protocol

   Copyright (C) Andrew Tridgell 1998

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


/* NOTES:

   This code makes no attempt to be fast! In fact, it is a very
   slow implementation

   This code is NOT a complete DES implementation. It implements only
   the minimum necessary for SMB authentication, as used by all SMB
   products (including every copy of Microsoft Windows95 ever sold)

   In particular, it can only do a unchained forward DES pass. This
   means it is not possible to use this code for encryption/decryption
   of data, instead it is only useful as a "hash" algorithm.

   There is no entry point into this code that allows normal DES operation.

   I believe this means that this code does not come under ITAR
   regulations but this is NOT a legal opinion. If you are concerned
   about the applicability of ITAR regulations to this code then you
   should confirm it for yourself (and maybe let me know if you come
   up with a different answer to the one above)
*/

#define DEBUG(a,b) ;

extern int DEBUGLEVEL;

#include <sys/types.h>     /* For size_t */
#include "auth-spa.h"
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifndef _AIX
typedef unsigned char uchar;
#endif


typedef int BOOL;
#define False 0
#define True  1

#ifndef _BYTEORDER_H
#define _BYTEORDER_H

#define RW_PCVAL(read,inbuf,outbuf,len) \
       { if (read) { PCVAL (inbuf,0,outbuf,len); } \
       else	 { PSCVAL(inbuf,0,outbuf,len); } }

#define RW_PIVAL(read,big_endian,inbuf,outbuf,len) \
       { if (read) { if (big_endian) { RPIVAL(inbuf,0,outbuf,len); } else { PIVAL(inbuf,0,outbuf,len); } } \
       else	 { if (big_endian) { RPSIVAL(inbuf,0,outbuf,len); } else { PSIVAL(inbuf,0,outbuf,len); } } }

#define RW_PSVAL(read,big_endian,inbuf,outbuf,len) \
       { if (read) { if (big_endian) { RPSVAL(inbuf,0,outbuf,len); } else { PSVAL(inbuf,0,outbuf,len); } } \
       else	 { if (big_endian) { RPSSVAL(inbuf,0,outbuf,len); } else { PSSVAL(inbuf,0,outbuf,len); } } }

#define RW_CVAL(read, inbuf, outbuf, offset) \
       { if (read) { (outbuf) = CVAL (inbuf,offset); } \
       else	 { SCVAL(inbuf,offset,outbuf); } }

#define RW_IVAL(read, big_endian, inbuf, outbuf, offset) \
       { if (read) { (outbuf) = ((big_endian) ? RIVAL(inbuf,offset) : IVAL (inbuf,offset)); } \
       else	 { if (big_endian) { RSIVAL(inbuf,offset,outbuf); } else { SIVAL(inbuf,offset,outbuf); } } }

#define RW_SVAL(read, big_endian, inbuf, outbuf, offset) \
       { if (read) { (outbuf) = ((big_endian) ? RSVAL(inbuf,offset) : SVAL (inbuf,offset)); } \
       else	 { if (big_endian) { RSSVAL(inbuf,offset,outbuf); } else { SSVAL(inbuf,offset,outbuf); } } }

#undef CAREFUL_ALIGNMENT

/* we know that the 386 can handle misalignment and has the "right"
   byteorder */
#ifdef __i386__
#define CAREFUL_ALIGNMENT 0
#endif

#ifndef CAREFUL_ALIGNMENT
#define CAREFUL_ALIGNMENT 1
#endif

#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
#define PVAL(buf,pos) ((unsigned)CVAL(buf,pos))
#define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val))


#if CAREFUL_ALIGNMENT

#define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8)
#define IVAL(buf,pos) (SVAL(buf,pos)|SVAL(buf,(pos)+2)<<16)
#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
#define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16))
#define SVALS(buf,pos) ((int16x)SVAL(buf,pos))
#define IVALS(buf,pos) ((int32x)IVAL(buf,pos))
#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((uint16x)(val)))
#define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32x)(val)))
#define SSVALS(buf,pos,val) SSVALX((buf),(pos),((int16x)(val)))
#define SIVALS(buf,pos,val) SIVALX((buf),(pos),((int32x)(val)))

#else /* CAREFUL_ALIGNMENT */

/* this handles things for architectures like the 386 that can handle
   alignment errors */
/*
   WARNING: This section is dependent on the length of int16x and int32x
   being correct
*/

/* get single value from an SMB buffer */
#define SVAL(buf,pos) (*(uint16x *)((char *)(buf) + (pos)))
#define IVAL(buf,pos) (*(uint32x *)((char *)(buf) + (pos)))
#define SVALS(buf,pos) (*(int16x *)((char *)(buf) + (pos)))
#define IVALS(buf,pos) (*(int32x *)((char *)(buf) + (pos)))

/* store single value in an SMB buffer */
#define SSVAL(buf,pos,val) SVAL(buf,pos)=((uint16x)(val))
#define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32x)(val))
#define SSVALS(buf,pos,val) SVALS(buf,pos)=((int16x)(val))
#define SIVALS(buf,pos,val) IVALS(buf,pos)=((int32x)(val))

#endif /* CAREFUL_ALIGNMENT */

/* macros for reading / writing arrays */

#define SMBMACRO(macro,buf,pos,val,len,size) \
{ int l; for (l = 0; l < (len); l++) (val)[l] = macro((buf), (pos) + (size)*l); }

#define SSMBMACRO(macro,buf,pos,val,len,size) \
{ int l; for (l = 0; l < (len); l++) macro((buf), (pos) + (size)*l, (val)[l]); }

/* reads multiple data from an SMB buffer */
#define PCVAL(buf,pos,val,len) SMBMACRO(CVAL,buf,pos,val,len,1)
#define PSVAL(buf,pos,val,len) SMBMACRO(SVAL,buf,pos,val,len,2)
#define PIVAL(buf,pos,val,len) SMBMACRO(IVAL,buf,pos,val,len,4)
#define PCVALS(buf,pos,val,len) SMBMACRO(CVALS,buf,pos,val,len,1)
#define PSVALS(buf,pos,val,len) SMBMACRO(SVALS,buf,pos,val,len,2)
#define PIVALS(buf,pos,val,len) SMBMACRO(IVALS,buf,pos,val,len,4)

/* stores multiple data in an SMB buffer */
#define PSCVAL(buf,pos,val,len) SSMBMACRO(SCVAL,buf,pos,val,len,1)
#define PSSVAL(buf,pos,val,len) SSMBMACRO(SSVAL,buf,pos,val,len,2)
#define PSIVAL(buf,pos,val,len) SSMBMACRO(SIVAL,buf,pos,val,len,4)
#define PSCVALS(buf,pos,val,len) SSMBMACRO(SCVALS,buf,pos,val,len,1)
#define PSSVALS(buf,pos,val,len) SSMBMACRO(SSVALS,buf,pos,val,len,2)
#define PSIVALS(buf,pos,val,len) SSMBMACRO(SIVALS,buf,pos,val,len,4)


/* now the reverse routines - these are used in nmb packets (mostly) */
#define SREV(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF))
#define IREV(x) ((SREV(x)<<16) | (SREV((x)>>16)))

#define RSVAL(buf,pos) SREV(SVAL(buf,pos))
#define RSVALS(buf,pos) SREV(SVALS(buf,pos))
#define RIVAL(buf,pos) IREV(IVAL(buf,pos))
#define RIVALS(buf,pos) IREV(IVALS(buf,pos))
#define RSSVAL(buf,pos,val) SSVAL(buf,pos,SREV(val))
#define RSSVALS(buf,pos,val) SSVALS(buf,pos,SREV(val))
#define RSIVAL(buf,pos,val) SIVAL(buf,pos,IREV(val))
#define RSIVALS(buf,pos,val) SIVALS(buf,pos,IREV(val))

/* reads multiple data from an SMB buffer (big-endian) */
#define RPSVAL(buf,pos,val,len) SMBMACRO(RSVAL,buf,pos,val,len,2)
#define RPIVAL(buf,pos,val,len) SMBMACRO(RIVAL,buf,pos,val,len,4)
#define RPSVALS(buf,pos,val,len) SMBMACRO(RSVALS,buf,pos,val,len,2)
#define RPIVALS(buf,pos,val,len) SMBMACRO(RIVALS,buf,pos,val,len,4)

/* stores multiple data in an SMB buffer (big-endian) */
#define RPSSVAL(buf,pos,val,len) SSMBMACRO(RSSVAL,buf,pos,val,len,2)
#define RPSIVAL(buf,pos,val,len) SSMBMACRO(RSIVAL,buf,pos,val,len,4)
#define RPSSVALS(buf,pos,val,len) SSMBMACRO(RSSVALS,buf,pos,val,len,2)
#define RPSIVALS(buf,pos,val,len) SSMBMACRO(RSIVALS,buf,pos,val,len,4)

#define DBG_RW_PCVAL(charmode,string,depth,base,read,inbuf,outbuf,len) \
       { RW_PCVAL(read,inbuf,outbuf,len) \
       DEBUG(5,("%s%04x %s: ", \
             tab_depth(depth), base,string)); \
    if (charmode) print_asc(5, (unsigned char*)(outbuf), (len)); else \
       { int idx; for (idx = 0; idx < len; idx++) { DEBUG(5,("%02x ", (outbuf)[idx])); } } \
       DEBUG(5,("\n")); }

#define DBG_RW_PSVAL(charmode,string,depth,base,read,big_endian,inbuf,outbuf,len) \
       { RW_PSVAL(read,big_endian,inbuf,outbuf,len) \
       DEBUG(5,("%s%04x %s: ", \
             tab_depth(depth), base,string)); \
    if (charmode) print_asc(5, (unsigned char*)(outbuf), 2*(len)); else \
       { int idx; for (idx = 0; idx < len; idx++) { DEBUG(5,("%04x ", (outbuf)[idx])); } } \
       DEBUG(5,("\n")); }

#define DBG_RW_PIVAL(charmode,string,depth,base,read,big_endian,inbuf,outbuf,len) \
       { RW_PIVAL(read,big_endian,inbuf,outbuf,len) \
       DEBUG(5,("%s%04x %s: ", \
             tab_depth(depth), base,string)); \
    if (charmode) print_asc(5, (unsigned char*)(outbuf), 4*(len)); else \
       { int idx; for (idx = 0; idx < len; idx++) { DEBUG(5,("%08x ", (outbuf)[idx])); } } \
       DEBUG(5,("\n")); }

#define DBG_RW_CVAL(string,depth,base,read,inbuf,outbuf) \
       { RW_CVAL(read,inbuf,outbuf,0) \
       DEBUG(5,("%s%04x %s: %02x\n", \
             tab_depth(depth), base, string, outbuf)); }

#define DBG_RW_SVAL(string,depth,base,read,big_endian,inbuf,outbuf) \
       { RW_SVAL(read,big_endian,inbuf,outbuf,0) \
       DEBUG(5,("%s%04x %s: %04x\n", \
             tab_depth(depth), base, string, outbuf)); }

#define DBG_RW_IVAL(string,depth,base,read,big_endian,inbuf,outbuf) \
       { RW_IVAL(read,big_endian,inbuf,outbuf,0) \
       DEBUG(5,("%s%04x %s: %08x\n", \
             tab_depth(depth), base, string, outbuf)); }

#endif /* _BYTEORDER_H */

void E_P16 (unsigned char *p14, unsigned char *p16);
void E_P24 (unsigned char *p21, unsigned char *c8, unsigned char *p24);
void D_P16 (unsigned char *p14, unsigned char *in, unsigned char *out);
void SMBOWFencrypt (uchar passwd[16], uchar * c8, uchar p24[24]);

void mdfour (unsigned char *out, unsigned char *in, int n);


/*
 * base64.c -- base-64 conversion routines.
 *
 * For license terms, see the file COPYING in this directory.
 *
 * This base 64 encoding is defined in RFC2045 section 6.8,
 * "Base64 Content-Transfer-Encoding", but lines must not be broken in the
 * scheme used here.
 */

static const char base64digits[] =
  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

#define BAD    -1
static const char base64val[] = {
  BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD,
    BAD,
  BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD,
    BAD,
  BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, 62, BAD, BAD, BAD,
    63,
  52, 53, 54, 55, 56, 57, 58, 59, 60, 61, BAD, BAD, BAD, BAD, BAD, BAD,
  BAD, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
  15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, BAD, BAD, BAD, BAD, BAD,
  BAD, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
  41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, BAD, BAD, BAD, BAD, BAD
};
#define DECODE64(c)  (isascii(c) ? base64val[c] : BAD)

void
spa_bits_to_base64 (unsigned char *out, const unsigned char *in, int inlen)
/* raw bytes in quasi-big-endian order to base 64 string (NUL-terminated) */
{
  for (; inlen >= 3; inlen -= 3)
    {
      *out++ = base64digits[in[0] >> 2];
      *out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)];
      *out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
      *out++ = base64digits[in[2] & 0x3f];
      in += 3;
    }
  if (inlen > 0)
    {
      unsigned char fragment;

      *out++ = base64digits[in[0] >> 2];
      fragment = (in[0] << 4) & 0x30;
      if (inlen > 1)
       fragment |= in[1] >> 4;
      *out++ = base64digits[fragment];
      *out++ = (inlen < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c];
      *out++ = '=';
    }
  *out = '\0';
}

int
spa_base64_to_bits (char *out, const char *in)
/* base 64 to raw bytes in quasi-big-endian order, returning count of bytes */
{
  int len = 0;
  register unsigned char digit1, digit2, digit3, digit4;

  if (in[0] == '+' && in[1] == ' ')
    in += 2;
  if (*in == '\r')
    return (0);

  do
    {
      digit1 = in[0];
      if (DECODE64 (digit1) == BAD)
       return (-1);
      digit2 = in[1];
      if (DECODE64 (digit2) == BAD)
       return (-1);
      digit3 = in[2];
      if (digit3 != '=' && DECODE64 (digit3) == BAD)
       return (-1);
      digit4 = in[3];
      if (digit4 != '=' && DECODE64 (digit4) == BAD)
       return (-1);
      in += 4;
      *out++ = (DECODE64 (digit1) << 2) | (DECODE64 (digit2) >> 4);
      ++len;
      if (digit3 != '=')
       {
	 *out++ =
	   ((DECODE64 (digit2) << 4) & 0xf0) | (DECODE64 (digit3) >> 2);
	 ++len;
	 if (digit4 != '=')
	   {
	     *out++ = ((DECODE64 (digit3) << 6) & 0xc0) | DECODE64 (digit4);
	     ++len;
	   }
       }
    }
  while (*in && *in != '\r' && digit4 != '=');

  return (len);
}


#define uchar unsigned char

static uchar perm1[56] = { 57, 49, 41, 33, 25, 17, 9,
  1, 58, 50, 42, 34, 26, 18,
  10, 2, 59, 51, 43, 35, 27,
  19, 11, 3, 60, 52, 44, 36,
  63, 55, 47, 39, 31, 23, 15,
  7, 62, 54, 46, 38, 30, 22,
  14, 6, 61, 53, 45, 37, 29,
  21, 13, 5, 28, 20, 12, 4
};

static uchar perm2[48] = { 14, 17, 11, 24, 1, 5,
  3, 28, 15, 6, 21, 10,
  23, 19, 12, 4, 26, 8,
  16, 7, 27, 20, 13, 2,
  41, 52, 31, 37, 47, 55,
  30, 40, 51, 45, 33, 48,
  44, 49, 39, 56, 34, 53,
  46, 42, 50, 36, 29, 32
};

static uchar perm3[64] = { 58, 50, 42, 34, 26, 18, 10, 2,
  60, 52, 44, 36, 28, 20, 12, 4,
  62, 54, 46, 38, 30, 22, 14, 6,
  64, 56, 48, 40, 32, 24, 16, 8,
  57, 49, 41, 33, 25, 17, 9, 1,
  59, 51, 43, 35, 27, 19, 11, 3,
  61, 53, 45, 37, 29, 21, 13, 5,
  63, 55, 47, 39, 31, 23, 15, 7
};

static uchar perm4[48] = { 32, 1, 2, 3, 4, 5,
  4, 5, 6, 7, 8, 9,
  8, 9, 10, 11, 12, 13,
  12, 13, 14, 15, 16, 17,
  16, 17, 18, 19, 20, 21,
  20, 21, 22, 23, 24, 25,
  24, 25, 26, 27, 28, 29,
  28, 29, 30, 31, 32, 1
};

static uchar perm5[32] = { 16, 7, 20, 21,
  29, 12, 28, 17,
  1, 15, 23, 26,
  5, 18, 31, 10,
  2, 8, 24, 14,
  32, 27, 3, 9,
  19, 13, 30, 6,
  22, 11, 4, 25
};


static uchar perm6[64] = { 40, 8, 48, 16, 56, 24, 64, 32,
  39, 7, 47, 15, 55, 23, 63, 31,
  38, 6, 46, 14, 54, 22, 62, 30,
  37, 5, 45, 13, 53, 21, 61, 29,
  36, 4, 44, 12, 52, 20, 60, 28,
  35, 3, 43, 11, 51, 19, 59, 27,
  34, 2, 42, 10, 50, 18, 58, 26,
  33, 1, 41, 9, 49, 17, 57, 25
};


static uchar sc[16] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };

static uchar sbox[8][4][16] = {
  {{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
   {0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
   {4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
   {15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13}},

  {{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
   {3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
   {0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
   {13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9}},

  {{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
   {13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
   {13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
   {1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12}},

  {{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
   {13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
   {10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
   {3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14}},

  {{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
   {14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
   {4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
   {11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3}},

  {{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
   {10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
   {9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
   {4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13}},

  {{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
   {13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
   {1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
   {6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12}},

  {{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
   {1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
   {7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
   {2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11}}
};

static void
permute (char *out, char *in, uchar * p, int n)
{
  int i;
  for (i = 0; i < n; i++)
    out[i] = in[p[i] - 1];
}

static void
lshift (char *d, int count, int n)
{
  char out[64];
  int i;
  for (i = 0; i < n; i++)
    out[i] = d[(i + count) % n];
  for (i = 0; i < n; i++)
    d[i] = out[i];
}

static void
concat (char *out, char *in1, char *in2, int l1, int l2)
{
  while (l1--)
    *out++ = *in1++;
  while (l2--)
    *out++ = *in2++;
}

static void
xor (char *out, char *in1, char *in2, int n)
{
  int i;
  for (i = 0; i < n; i++)
    out[i] = in1[i] ^ in2[i];
}

static void
dohash (char *out, char *in, char *key, int forw)
{
  int i, j, k;
  char pk1[56];
  char c[28];
  char d[28];
  char cd[56];
  char ki[16][48];
  char pd1[64];
  char l[32], r[32];
  char rl[64];

  permute (pk1, key, perm1, 56);

  for (i = 0; i < 28; i++)
    c[i] = pk1[i];
  for (i = 0; i < 28; i++)
    d[i] = pk1[i + 28];

  for (i = 0; i < 16; i++)
    {
      lshift (c, sc[i], 28);
      lshift (d, sc[i], 28);

      concat (cd, c, d, 28, 28);
      permute (ki[i], cd, perm2, 48);
    }

  permute (pd1, in, perm3, 64);

  for (j = 0; j < 32; j++)
    {
      l[j] = pd1[j];
      r[j] = pd1[j + 32];
    }

  for (i = 0; i < 16; i++)
    {
      char er[48];
      char erk[48];
      char b[8][6];
      char cb[32];
      char pcb[32];
      char r2[32];

      permute (er, r, perm4, 48);

      xor (erk, er, ki[forw ? i : 15 - i], 48);

      for (j = 0; j < 8; j++)
       for (k = 0; k < 6; k++)
	 b[j][k] = erk[j * 6 + k];

      for (j = 0; j < 8; j++)
       {
	 int m, n;
	 m = (b[j][0] << 1) | b[j][5];

	 n = (b[j][1] << 3) | (b[j][2] << 2) | (b[j][3] << 1) | b[j][4];

	 for (k = 0; k < 4; k++)
	   b[j][k] = (sbox[j][m][n] & (1 << (3 - k))) ? 1 : 0;
       }

      for (j = 0; j < 8; j++)
       for (k = 0; k < 4; k++)
	 cb[j * 4 + k] = b[j][k];
      permute (pcb, cb, perm5, 32);

      xor (r2, l, pcb, 32);

      for (j = 0; j < 32; j++)
       l[j] = r[j];

      for (j = 0; j < 32; j++)
       r[j] = r2[j];
    }

  concat (rl, r, l, 32, 32);

  permute (out, rl, perm6, 64);
}

static void
str_to_key (unsigned char *str, unsigned char *key)
{
  int i;

  key[0] = str[0] >> 1;
  key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
  key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
  key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
  key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
  key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
  key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
  key[7] = str[6] & 0x7F;
  for (i = 0; i < 8; i++)
    {
      key[i] = (key[i] << 1);
    }
}


static void
smbhash (unsigned char *out, unsigned char *in, unsigned char *key, int forw)
{
  int i;
  char outb[64];
  char inb[64];
  char keyb[64];
  unsigned char key2[8];

  str_to_key (key, key2);

  for (i = 0; i < 64; i++)
    {
      inb[i] = (in[i / 8] & (1 << (7 - (i % 8)))) ? 1 : 0;
      keyb[i] = (key2[i / 8] & (1 << (7 - (i % 8)))) ? 1 : 0;
      outb[i] = 0;
    }

  dohash (outb, inb, keyb, forw);

  for (i = 0; i < 8; i++)
    {
      out[i] = 0;
    }

  for (i = 0; i < 64; i++)
    {
      if (outb[i])
       out[i / 8] |= (1 << (7 - (i % 8)));
    }
}

void
E_P16 (unsigned char *p14, unsigned char *p16)
{
  unsigned char sp8[8] = { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
  smbhash (p16, sp8, p14, 1);
  smbhash (p16 + 8, sp8, p14 + 7, 1);
}

void
E_P24 (unsigned char *p21, unsigned char *c8, unsigned char *p24)
{
  smbhash (p24, c8, p21, 1);
  smbhash (p24 + 8, c8, p21 + 7, 1);
  smbhash (p24 + 16, c8, p21 + 14, 1);
}

void
D_P16 (unsigned char *p14, unsigned char *in, unsigned char *out)
{
  smbhash (out, in, p14, 0);
  smbhash (out + 8, in + 8, p14 + 7, 0);
}

/****************************************************************************
 Like strncpy but always null terminates. Make sure there is room!
 The variable n should always be one less than the available size.
****************************************************************************/

char *
StrnCpy (char *dest, const char *src, size_t n)
{
  char *d = dest;
  if (!dest)
    return (NULL);
  if (!src)
    {
      *dest = 0;
      return (dest);
    }
  while (n-- && (*d++ = *src++));
  *d = 0;
  return (dest);
}

size_t
skip_multibyte_char (char c)
{
  /* bogus if to get rid of unused compiler warning */
  if (c)
    return 0;
  else
    return 0;
}


/*******************************************************************
safe string copy into a known length string. maxlength does not
include the terminating zero.
********************************************************************/

char *
safe_strcpy (char *dest, const char *src, size_t maxlength)
{
  size_t len;

  if (!dest)
    {
      DEBUG (0, ("ERROR: NULL dest in safe_strcpy\n"));
      return NULL;
    }

  if (!src)
    {
      *dest = 0;
      return dest;
    }

  len = strlen (src);

  if (len > maxlength)
    {
      DEBUG (0, ("ERROR: string overflow by %d in safe_strcpy [%.50s]\n",
		(int) (len - maxlength), src));
      len = maxlength;
    }

  memcpy (dest, src, len);
  dest[len] = 0;
  return dest;
}


void
strupper (char *s)
{
  while (*s)
    {
      {
       size_t skip = skip_multibyte_char (*s);
       if (skip != 0)
	 s += skip;
       else
	 {
	   if (islower ((unsigned char)(*s)))
	     *s = toupper (*s);
	   s++;
	 }
      }
    }
}


/*
 This implements the X/Open SMB password encryption
 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
 encrypted password into p24
 */

void
spa_smb_encrypt (uchar * passwd, uchar * c8, uchar * p24)
{
  uchar p14[15], p21[21];

  memset (p21, '\0', 21);
  memset (p14, '\0', 14);
  StrnCpy ((char *) p14, (char *) passwd, 14);

  strupper ((char *) p14);
  E_P16 (p14, p21);

  SMBOWFencrypt (p21, c8, p24);

#ifdef DEBUG_PASSWORD
  DEBUG (100, ("spa_smb_encrypt: lm#, challenge, response\n"));
  dump_data (100, (char *) p21, 16);
  dump_data (100, (char *) c8, 8);
  dump_data (100, (char *) p24, 24);
#endif
}

/* Routines for Windows NT MD4 Hash functions. */
static int
_my_wcslen (int16x * str)
{
  int len = 0;
  while (*str++ != 0)
    len++;
  return len;
}

/*
 * Convert a string into an NT UNICODE string.
 * Note that regardless of processor type
 * this must be in intel (little-endian)
 * format.
 */

static int
_my_mbstowcs (int16x * dst, uchar * src, int len)
{
  int i;
  int16x val;

  for (i = 0; i < len; i++)
    {
      val = *src;
      SSVAL (dst, 0, val);
      dst++;
      src++;
      if (val == 0)
       break;
    }
  return i;
}

/*
 * Creates the MD4 Hash of the users password in NT UNICODE.
 */

void
E_md4hash (uchar * passwd, uchar * p16)
{
  int len;
  int16x wpwd[129];

  /* Password cannot be longer than 128 characters */
  len = strlen ((char *) passwd);
  if (len > 128)
    len = 128;
  /* Password must be converted to NT unicode */
  _my_mbstowcs (wpwd, passwd, len);
  wpwd[len] = 0;	       /* Ensure string is null terminated */
  /* Calculate length in bytes */
  len = _my_wcslen (wpwd) * sizeof (int16x);

  mdfour (p16, (unsigned char *) wpwd, len);
}

/* Does both the NT and LM owfs of a user's password */
void
nt_lm_owf_gen (char *pwd, uchar nt_p16[16], uchar p16[16])
{
  char passwd[130];

  memset (passwd, '\0', 130);
  safe_strcpy (passwd, pwd, sizeof (passwd) - 1);

  /* Calculate the MD4 hash (NT compatible) of the password */
  memset (nt_p16, '\0', 16);
  E_md4hash ((uchar *) passwd, nt_p16);

#ifdef DEBUG_PASSWORD
  DEBUG (100, ("nt_lm_owf_gen: pwd, nt#\n"));
  dump_data (120, passwd, strlen (passwd));
  dump_data (100, (char *) nt_p16, 16);
#endif

  /* Mangle the passwords into Lanman format */
  passwd[14] = '\0';
  strupper (passwd);

  /* Calculate the SMB (lanman) hash functions of the password */

  memset (p16, '\0', 16);
  E_P16 ((uchar *) passwd, (uchar *) p16);

#ifdef DEBUG_PASSWORD
  DEBUG (100, ("nt_lm_owf_gen: pwd, lm#\n"));
  dump_data (120, passwd, strlen (passwd));
  dump_data (100, (char *) p16, 16);
#endif
  /* clear out local copy of user's password (just being paranoid). */
  memset (passwd, '\0', sizeof (passwd));
}

/* Does the des encryption from the NT or LM MD4 hash. */
void
SMBOWFencrypt (uchar passwd[16], uchar * c8, uchar p24[24])
{
  uchar p21[21];

  memset (p21, '\0', 21);

  memcpy (p21, passwd, 16);
  E_P24 (p21, c8, p24);
}

/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
void
NTLMSSPOWFencrypt (uchar passwd[8], uchar * ntlmchalresp, uchar p24[24])
{
  uchar p21[21];

  memset (p21, '\0', 21);
  memcpy (p21, passwd, 8);
  memset (p21 + 8, 0xbd, 8);

  E_P24 (p21, ntlmchalresp, p24);
#ifdef DEBUG_PASSWORD
  DEBUG (100, ("NTLMSSPOWFencrypt: p21, c8, p24\n"));
  dump_data (100, (char *) p21, 21);
  dump_data (100, (char *) ntlmchalresp, 8);
  dump_data (100, (char *) p24, 24);
#endif
}


/* Does the NT MD4 hash then des encryption. */

void
spa_smb_nt_encrypt (uchar * passwd, uchar * c8, uchar * p24)
{
  uchar p21[21];

  memset (p21, '\0', 21);

  E_md4hash (passwd, p21);
  SMBOWFencrypt (p21, c8, p24);

#ifdef DEBUG_PASSWORD
  DEBUG (100, ("spa_smb_nt_encrypt: nt#, challenge, response\n"));
  dump_data (100, (char *) p21, 16);
  dump_data (100, (char *) c8, 8);
  dump_data (100, (char *) p24, 24);
#endif
}

static uint32x A, B, C, D;

static uint32x
F (uint32x X, uint32x Y, uint32x Z)
{
  return (X & Y) | ((~X) & Z);
}

static uint32x
G (uint32x X, uint32x Y, uint32x Z)
{
  return (X & Y) | (X & Z) | (Y & Z);
}

static uint32x
H (uint32x X, uint32x Y, uint32x Z)
{
  return X ^ Y ^ Z;
}

static uint32x
lshift_a (uint32x x, int s)
{
  x &= 0xFFFFFFFF;
  return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
}

#define ROUND1(a,b,c,d,k,s) a = lshift_a(a + F(b,c,d) + X[k], s)
#define ROUND2(a,b,c,d,k,s) a = lshift_a(a + G(b,c,d) + X[k] + (uint32x)0x5A827999,s)
#define ROUND3(a,b,c,d,k,s) a = lshift_a(a + H(b,c,d) + X[k] + (uint32x)0x6ED9EBA1,s)

/* this applies md4 to 64 byte chunks */
static void
spa_mdfour64 (uint32x * M)
{
  int j;
  uint32x AA, BB, CC, DD;
  uint32x X[16];

  for (j = 0; j < 16; j++)
    X[j] = M[j];

  AA = A;
  BB = B;
  CC = C;
  DD = D;

  ROUND1 (A, B, C, D, 0, 3);
  ROUND1 (D, A, B, C, 1, 7);
  ROUND1 (C, D, A, B, 2, 11);
  ROUND1 (B, C, D, A, 3, 19);
  ROUND1 (A, B, C, D, 4, 3);
  ROUND1 (D, A, B, C, 5, 7);
  ROUND1 (C, D, A, B, 6, 11);
  ROUND1 (B, C, D, A, 7, 19);
  ROUND1 (A, B, C, D, 8, 3);
  ROUND1 (D, A, B, C, 9, 7);
  ROUND1 (C, D, A, B, 10, 11);
  ROUND1 (B, C, D, A, 11, 19);
  ROUND1 (A, B, C, D, 12, 3);
  ROUND1 (D, A, B, C, 13, 7);
  ROUND1 (C, D, A, B, 14, 11);
  ROUND1 (B, C, D, A, 15, 19);

  ROUND2 (A, B, C, D, 0, 3);
  ROUND2 (D, A, B, C, 4, 5);
  ROUND2 (C, D, A, B, 8, 9);
  ROUND2 (B, C, D, A, 12, 13);
  ROUND2 (A, B, C, D, 1, 3);
  ROUND2 (D, A, B, C, 5, 5);
  ROUND2 (C, D, A, B, 9, 9);
  ROUND2 (B, C, D, A, 13, 13);
  ROUND2 (A, B, C, D, 2, 3);
  ROUND2 (D, A, B, C, 6, 5);
  ROUND2 (C, D, A, B, 10, 9);
  ROUND2 (B, C, D, A, 14, 13);
  ROUND2 (A, B, C, D, 3, 3);
  ROUND2 (D, A, B, C, 7, 5);
  ROUND2 (C, D, A, B, 11, 9);
  ROUND2 (B, C, D, A, 15, 13);

  ROUND3 (A, B, C, D, 0, 3);
  ROUND3 (D, A, B, C, 8, 9);
  ROUND3 (C, D, A, B, 4, 11);
  ROUND3 (B, C, D, A, 12, 15);
  ROUND3 (A, B, C, D, 2, 3);
  ROUND3 (D, A, B, C, 10, 9);
  ROUND3 (C, D, A, B, 6, 11);
  ROUND3 (B, C, D, A, 14, 15);
  ROUND3 (A, B, C, D, 1, 3);
  ROUND3 (D, A, B, C, 9, 9);
  ROUND3 (C, D, A, B, 5, 11);
  ROUND3 (B, C, D, A, 13, 15);
  ROUND3 (A, B, C, D, 3, 3);
  ROUND3 (D, A, B, C, 11, 9);
  ROUND3 (C, D, A, B, 7, 11);
  ROUND3 (B, C, D, A, 15, 15);

  A += AA;
  B += BB;
  C += CC;
  D += DD;

  A &= 0xFFFFFFFF;
  B &= 0xFFFFFFFF;
  C &= 0xFFFFFFFF;
  D &= 0xFFFFFFFF;

  for (j = 0; j < 16; j++)
    X[j] = 0;
}

static void
copy64 (uint32x * M, unsigned char *in)
{
  int i;

  for (i = 0; i < 16; i++)
    M[i] = (in[i * 4 + 3] << 24) | (in[i * 4 + 2] << 16) |
      (in[i * 4 + 1] << 8) | (in[i * 4 + 0] << 0);
}

static void
copy4 (unsigned char *out, uint32x x)
{
  out[0] = x & 0xFF;
  out[1] = (x >> 8) & 0xFF;
  out[2] = (x >> 16) & 0xFF;
  out[3] = (x >> 24) & 0xFF;
}

/* produce a md4 message digest from data of length n bytes */
void
mdfour (unsigned char *out, unsigned char *in, int n)
{
  unsigned char buf[128];
  uint32x M[16];
  uint32x b = n * 8;
  int i;

  A = 0x67452301;
  B = 0xefcdab89;
  C = 0x98badcfe;
  D = 0x10325476;

  while (n > 64)
    {
      copy64 (M, in);
      spa_mdfour64 (M);
      in += 64;
      n -= 64;
    }

  for (i = 0; i < 128; i++)
    buf[i] = 0;
  memcpy (buf, in, n);
  buf[n] = 0x80;

  if (n <= 55)
    {
      copy4 (buf + 56, b);
      copy64 (M, buf);
      spa_mdfour64 (M);
    }
  else
    {
      copy4 (buf + 120, b);
      copy64 (M, buf);
      spa_mdfour64 (M);
      copy64 (M, buf + 64);
      spa_mdfour64 (M);
    }

  for (i = 0; i < 128; i++)
    buf[i] = 0;
  copy64 (M, buf);

  copy4 (out, A);
  copy4 (out + 4, B);
  copy4 (out + 8, C);
  copy4 (out + 12, D);

  A = B = C = D = 0;
}

char versionString[] = "libntlm version 0.21";

/* Utility routines that handle NTLM auth structures. */

/* The [IS]VAL macros are to take care of byte order for non-Intel
 * Machines -- I think this file is OK, but it hasn't been tested.
 * The other files (the ones stolen from Samba) should be OK.
 */


/* I am not crazy about these macros -- they seem to have gotten
 * a bit complex.  A new scheme for handling string/buffer fields
 * in the structures probably needs to be designed
 */

#define spa_bytes_add(ptr, header, buf, count) \
{ \
if (buf && count) \
  { \
  SSVAL(&ptr->header.len,0,count); \
  SSVAL(&ptr->header.maxlen,0,count); \
  SIVAL(&ptr->header.offset,0,((ptr->buffer - ((uint8x*)ptr)) + ptr->bufIndex)); \
  memcpy(ptr->buffer+ptr->bufIndex, buf, count); \
  ptr->bufIndex += count; \
  } \
else \
  { \
  ptr->header.len = \
  ptr->header.maxlen = 0; \
  SIVAL(&ptr->header.offset,0,ptr->bufIndex); \
  } \
}

#define spa_string_add(ptr, header, string) \
{ \
char *p = string; \
int len = 0; \
if (p) len = strlen(p); \
spa_bytes_add(ptr, header, ((unsigned char*)p), len); \
}

#define spa_unicode_add_string(ptr, header, string) \
{ \
char *p = string; \
unsigned char *b = NULL; \
int len = 0; \
if (p) \
  { \
  len = strlen(p); \
  b = strToUnicode(p); \
  } \
spa_bytes_add(ptr, header, b, len*2); \
}


#define GetUnicodeString(structPtr, header) \
unicodeToString(((char*)structPtr) + IVAL(&structPtr->header.offset,0) , SVAL(&structPtr->header.len,0)/2)
#define GetString(structPtr, header) \
toString((((char *)structPtr) + IVAL(&structPtr->header.offset,0)), SVAL(&structPtr->header.len,0))
#define DumpBuffer(fp, structPtr, header) \
dumpRaw(fp,((unsigned char*)structPtr)+IVAL(&structPtr->header.offset,0),SVAL(&structPtr->header.len,0))


static void
dumpRaw (FILE * fp, unsigned char *buf, size_t len)
{
  int i;

  for (i = 0; i < len; ++i)
    fprintf (fp, "%02x ", buf[i]);

  fprintf (fp, "\n");
}

char *
unicodeToString (char *p, size_t len)
{
  int i;
  static char buf[1024];

  assert (len + 1 < sizeof buf);

  for (i = 0; i < len; ++i)
    {
      buf[i] = *p & 0x7f;
      p += 2;
    }

  buf[i] = '\0';
  return buf;
}

static unsigned char *
strToUnicode (char *p)
{
  static unsigned char buf[1024];
  size_t l = strlen (p);
  int i = 0;

  assert (l * 2 < sizeof buf);

  while (l--)
    {
      buf[i++] = *p++;
      buf[i++] = 0;
    }

  return buf;
}

static unsigned char *
toString (char *p, size_t len)
{
  static unsigned char buf[1024];

  assert (len + 1 < sizeof buf);

  memcpy (buf, p, len);
  buf[len] = 0;
  return buf;
}

void
dumpSmbNtlmAuthRequest (FILE * fp, SPAAuthRequest * request)
{
  fprintf (fp, "NTLM Request:\n");
  fprintf (fp, "      Ident = %s\n", request->ident);
  fprintf (fp, "      mType = %d\n", IVAL (&request->msgType, 0));
  fprintf (fp, "      Flags = %08x\n", IVAL (&request->flags, 0));
  fprintf (fp, "       User = %s\n", GetString (request, user));
  fprintf (fp, "     Domain = %s\n", GetString (request, domain));
}

void
dumpSmbNtlmAuthChallenge (FILE * fp, SPAAuthChallenge * challenge)
{
  fprintf (fp, "NTLM Challenge:\n");
  fprintf (fp, "      Ident = %s\n", challenge->ident);
  fprintf (fp, "      mType = %d\n", IVAL (&challenge->msgType, 0));
  fprintf (fp, "     Domain = %s\n", GetUnicodeString (challenge, uDomain));
  fprintf (fp, "      Flags = %08x\n", IVAL (&challenge->flags, 0));
  fprintf (fp, "  Challenge = ");
  dumpRaw (fp, challenge->challengeData, 8);
}

void
dumpSmbNtlmAuthResponse (FILE * fp, SPAAuthResponse * response)
{
  fprintf (fp, "NTLM Response:\n");
  fprintf (fp, "      Ident = %s\n", response->ident);
  fprintf (fp, "      mType = %d\n", IVAL (&response->msgType, 0));
  fprintf (fp, "     LmResp = ");
  DumpBuffer (fp, response, lmResponse);
  fprintf (fp, "     NTResp = ");
  DumpBuffer (fp, response, ntResponse);
  fprintf (fp, "     Domain = %s\n", GetUnicodeString (response, uDomain));
  fprintf (fp, "       User = %s\n", GetUnicodeString (response, uUser));
  fprintf (fp, "        Wks = %s\n", GetUnicodeString (response, uWks));
  fprintf (fp, "       sKey = ");
  DumpBuffer (fp, response, sessionKey);
  fprintf (fp, "      Flags = %08x\n", IVAL (&response->flags, 0));
}

void
spa_build_auth_request (SPAAuthRequest * request, char *user, char *domain)
{
  char *u = strdup (user);
  char *p = strchr (u, '@');

  if (p)
    {
      if (!domain)
       domain = p + 1;
      *p = '\0';
    }

  request->bufIndex = 0;
  memcpy (request->ident, "NTLMSSP\0\0\0", 8);
  SIVAL (&request->msgType, 0, 1);
  SIVAL (&request->flags, 0, 0x0000b207);      /* have to figure out what these mean */
  spa_string_add (request, user, u);
  spa_string_add (request, domain, domain);
  free (u);
}



void
spa_build_auth_challenge (SPAAuthRequest * request, SPAAuthChallenge * challenge)
{
  char chalstr[8];
  int i;
  int p = (int)getpid();
  int random_seed = (int)time(NULL) ^ ((p << 16) | p);

  challenge->bufIndex = 0;
  memcpy (challenge->ident, "NTLMSSP\0", 8);
  SIVAL (&challenge->msgType, 0, 2);
  SIVAL (&challenge->flags, 0, 0x00008201);
  SIVAL (&challenge->uDomain.len, 0, 0x0000);
  SIVAL (&challenge->uDomain.maxlen, 0, 0x0000);
  SIVAL (&challenge->uDomain.offset, 0, 0x00002800);

  /* generate eight pseudo random bytes (method ripped from host.c) */

  for(i=0;i<8;i++) {
    chalstr[i] = (unsigned char)(random_seed >> 16) % 256;
    random_seed = (1103515245 - (chalstr[i])) * random_seed + 12345;
  };

  memcpy(challenge->challengeData,chalstr,8);
}



void
spa_build_auth_response (SPAAuthChallenge * challenge,
			SPAAuthResponse * response, char *user,
			char *password)
{
  uint8x lmRespData[24];
  uint8x ntRespData[24];
  char *d = strdup (GetUnicodeString (challenge, uDomain));
  char *domain = d;
  char *u = strdup (user);
  char *p = strchr (u, '@');

  if (p)
    {
      domain = p + 1;
      *p = '\0';
    }

  spa_smb_encrypt ((uchar *)password, challenge->challengeData, lmRespData);
  spa_smb_nt_encrypt ((uchar *)password, challenge->challengeData, ntRespData);

  response->bufIndex = 0;
  memcpy (response->ident, "NTLMSSP\0\0\0", 8);
  SIVAL (&response->msgType, 0, 3);

  spa_bytes_add (response, lmResponse, lmRespData, 24);
  spa_bytes_add (response, ntResponse, ntRespData, 24);
  spa_unicode_add_string (response, uDomain, domain);
  spa_unicode_add_string (response, uUser, u);
  spa_unicode_add_string (response, uWks, u);
  spa_string_add (response, sessionKey, NULL);

  response->flags = challenge->flags;

  free (d);
  free (u);
}
