/* PW VERSCHLÜSSELUNG */


function doChallengeResponse(superchallenged) {	
	//Passwort wird aus dem Feld ausgelesen
	fvalue = document.login_form.pass.value;
	time = document.login_form.time.value;
	time2 = document.login_form.time2.value;
	
	if (fvalue)	{ 
		if (superchallenged)	{
			// Hashes berechnen
			date1 = MD5(time);
			date2 = MD5(time2);

			/* Das Passwort und die Hashes werden zusammengefügt, um sie vom Passwort abzutrennen wird "\\//" eingefügt
			Der ganze String wird dann mit base64 kodiert */				
			fvalue = encode_base64(date1+"\\\\//"+fvalue+"\\\\//"+date2);
		}
		
		// Das verschlüsselte Passwort wird wieder in die Textbox geschrieben
		document.login_form.pass.value = fvalue;
		return true;
	}
}


function randomChar(str) 
// Given : str is a nonempty string 
// Returns: a random character from the string 
{ 
	return str.charAt(randomInt(0, str.length-1)); 
}

function randomInt(low, high) 
// Given : low <= high 
// Given : a random real integer in the range [low, high] 
{ 
	return Math.floor(Math.random()*(high-low+1)) + low; 
}

/* MD5 ALGORITHMUS */


/*
 *  md5.jvs 1.0b 27/06/96
 *
 * Javascript implementation of the RSA Data Security, Inc. MD5
 * Message-Digest Algorithm.
 *
 * Copyright (c) 1996 Henri Torgemane. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for any purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies.
 *
 * Of course, this soft is provided "as is" without express or implied
 * warranty of any kind.
 */



function array(n) {
  for(i=0;i<n;i++) this[i]=0;
  this.length=n;
}

/* Some basic logical functions had to be rewritten because of a bug in
 * Javascript.. Just try to compute 0xffffffff >> 4 with it..
 * Of course, these functions are slower than the original would be, but
 * at least, they work!
 */

function integer(n) { return n%(0xffffffff+1); }

function shr(a,b) {
  a=integer(a);
  b=integer(b);
  if (a-0x80000000>=0) {
    a=a%0x80000000;
    a>>=b;
    a+=0x40000000>>(b-1);
  } else
    a>>=b;
  return a;
}

function shl1(a) {
  a=a%0x80000000;
  if (a&0x40000000==0x40000000)
  {
    a-=0x40000000;
    a*=2;
    a+=0x80000000;
  } else
    a*=2;
  return a;
}

function shl(a,b) {
  a=integer(a);
  b=integer(b);
  for (var i=0;i<b;i++) a=shl1(a);
  return a;
}

function and(a,b) {
  a=integer(a);
  b=integer(b);
  var t1=(a-0x80000000);
  var t2=(b-0x80000000);
  if (t1>=0)
    if (t2>=0)
      return ((t1&t2)+0x80000000);
    else
      return (t1&b);
  else
    if (t2>=0)
      return (a&t2);
    else
      return (a&b);
}

function or(a,b) {
  a=integer(a);
  b=integer(b);
  var t1=(a-0x80000000);
  var t2=(b-0x80000000);
  if (t1>=0)
    if (t2>=0)
      return ((t1|t2)+0x80000000);
    else
      return ((t1|b)+0x80000000);
  else
    if (t2>=0)
      return ((a|t2)+0x80000000);
    else
      return (a|b);
}

function xor(a,b) {
  a=integer(a);
  b=integer(b);
  var t1=(a-0x80000000);
  var t2=(b-0x80000000);
  if (t1>=0)
    if (t2>=0)
      return (t1^t2);
    else
      return ((t1^b)+0x80000000);
  else
    if (t2>=0)
      return ((a^t2)+0x80000000);
    else
      return (a^b);
}

function not(a) {
  a=integer(a);
  return (0xffffffff-a);
}

/* Here begin the real algorithm */

    var state = new array(4);
    var count = new array(2);
	count[0] = 0;
	count[1] = 0;
    var buffer = new array(64);
    var transformBuffer = new array(16);
    var digestBits = new array(16);

    var S11 = 7;
    var S12 = 12;
    var S13 = 17;
    var S14 = 22;
    var S21 = 5;
    var S22 = 9;
    var S23 = 14;
    var S24 = 20;
    var S31 = 4;
    var S32 = 11;
    var S33 = 16;
    var S34 = 23;
    var S41 = 6;
    var S42 = 10;
    var S43 = 15;
    var S44 = 21;

    function F(x,y,z) {
	return or(and(x,y),and(not(x),z));
    }

    function G(x,y,z) {
	return or(and(x,z),and(y,not(z)));
    }

    function H(x,y,z) {
	return xor(xor(x,y),z);
    }

    function I(x,y,z) {
	return xor(y ,or(x , not(z)));
    }

    function rotateLeft(a,n) {
	return or(shl(a, n),(shr(a,(32 - n))));
    }

    function FF(a,b,c,d,x,s,ac) {
        a = a+F(b, c, d) + x + ac;
	a = rotateLeft(a, s);
	a = a+b;
	return a;
    }

    function GG(a,b,c,d,x,s,ac) {
	a = a+G(b, c, d) +x + ac;
	a = rotateLeft(a, s);
	a = a+b;
	return a;
    }

    function HH(a,b,c,d,x,s,ac) {
	a = a+H(b, c, d) + x + ac;
	a = rotateLeft(a, s);
	a = a+b;
	return a;
    }

    function II(a,b,c,d,x,s,ac) {
	a = a+I(b, c, d) + x + ac;
	a = rotateLeft(a, s);
	a = a+b;
	return a;
    }

    function transform(buf,offset) {
	var a=0, b=0, c=0, d=0;
	var x = transformBuffer;

	a = state[0];
	b = state[1];
	c = state[2];
	d = state[3];

	for (i = 0; i < 16; i++) {
	    x[i] = and(buf[i*4+offset],0xff);
	    for (j = 1; j < 4; j++) {
		x[i]+=shl(and(buf[i*4+j+offset] ,0xff), j * 8);
	    }
	}

	/* Round 1 */
	a = FF ( a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
	d = FF ( d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
	c = FF ( c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
	b = FF ( b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
	a = FF ( a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
	d = FF ( d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
	c = FF ( c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
	b = FF ( b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
	a = FF ( a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
	d = FF ( d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
	c = FF ( c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
	b = FF ( b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
	a = FF ( a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
	d = FF ( d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
	c = FF ( c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
	b = FF ( b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

	/* Round 2 */
	a = GG ( a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
	d = GG ( d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
	c = GG ( c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
	b = GG ( b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
	a = GG ( a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
	d = GG ( d, a, b, c, x[10], S22,  0x2441453); /* 22 */
	c = GG ( c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
	b = GG ( b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
	a = GG ( a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
	d = GG ( d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
	c = GG ( c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
	b = GG ( b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
	a = GG ( a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
	d = GG ( d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
	c = GG ( c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
	b = GG ( b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

	/* Round 3 */
	a = HH ( a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
	d = HH ( d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
	c = HH ( c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
	b = HH ( b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
	a = HH ( a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
	d = HH ( d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
	c = HH ( c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
	b = HH ( b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
	a = HH ( a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
	d = HH ( d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
	c = HH ( c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
	b = HH ( b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
	a = HH ( a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
	d = HH ( d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
	c = HH ( c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
	b = HH ( b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

	/* Round 4 */
	a = II ( a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
	d = II ( d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
	c = II ( c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
	b = II ( b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
	a = II ( a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
	d = II ( d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
	c = II ( c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
	b = II ( b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
	a = II ( a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
	d = II ( d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
	c = II ( c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
	b = II ( b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
	a = II ( a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
	d = II ( d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
	c = II ( c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
	b = II ( b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

	state[0] +=a;
	state[1] +=b;
	state[2] +=c;
	state[3] +=d;

    }

    function init() {
	count[0]=count[1] = 0;
	state[0] = 0x67452301;
	state[1] = 0xefcdab89;
	state[2] = 0x98badcfe;
	state[3] = 0x10325476;
	for (i = 0; i < digestBits.length; i++)
	    digestBits[i] = 0;
    }

    function update(b) {
	var index,i;

	index = and(shr(count[0],3) , 0x3f);
	if (count[0]<0xffffffff-7)
	  count[0] += 8;
        else {
	  count[1]++;
	  count[0]-=0xffffffff+1;
          count[0]+=8;
        }
	buffer[index] = and(b,0xff);
	if (index  >= 63) {
	    transform(buffer, 0);
	}
    }

    function finish() {
	var bits = new array(8);
	var	padding;
	var	i=0, index=0, padLen=0;

	for (i = 0; i < 4; i++) {
	    bits[i] = and(shr(count[0],(i * 8)), 0xff);
	}
        for (i = 0; i < 4; i++) {
	    bits[i+4]=and(shr(count[1],(i * 8)), 0xff);
	}
	index = and(shr(count[0], 3) ,0x3f);
	padLen = (index < 56) ? (56 - index) : (120 - index);
	padding = new array(64);
	padding[0] = 0x80;
        for (i=0;i<padLen;i++)
	  update(padding[i]);
        for (i=0;i<8;i++)
	  update(bits[i]);

	for (i = 0; i < 4; i++) {
	    for (j = 0; j < 4; j++) {
		digestBits[i*4+j] = and(shr(state[i], (j * 8)) , 0xff);
	    }
	}
    }

/* End of the MD5 algorithm */

function hexa(n) {
 var hexa_h = "0123456789abcdef";
 var hexa_c="";
 var hexa_m=n;
 for (hexa_i=0;hexa_i<8;hexa_i++) {
   hexa_c=hexa_h.charAt(Math.abs(hexa_m)%16)+hexa_c;
   hexa_m=Math.floor(hexa_m/16);
 }
 return hexa_c;
}


var ascii="01234567890123456789012345678901" +
          " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ"+
          "[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";

function MD5(entree)
{
 var l,s,k,ka,kb,kc,kd;

 init();
 for (k=0;k<entree.length;k++) {
   l=entree.charAt(k);
   update(ascii.lastIndexOf(l));
 }
 finish();
 ka=kb=kc=kd=0;
 for (i=0;i<4;i++) ka+=shl(digestBits[15-i], (i*8));
 for (i=4;i<8;i++) kb+=shl(digestBits[15-i], ((i-4)*8));
 for (i=8;i<12;i++) kc+=shl(digestBits[15-i], ((i-8)*8));
 for (i=12;i<16;i++) kd+=shl(digestBits[15-i], ((i-12)*8));
 s=hexa(kd)+hexa(kc)+hexa(kb)+hexa(ka);
 return s;
}


/* BASE64 Algorithmus */


/*
 * Caudium - An extensible World Wide Web server
 * Copyright C 2002 The Caudium Group
 *
 * 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.
 *
 */

/*
 * base64.js - a JavaScript implementation of the base64 algorithm,
 *             (mostly) as defined in RFC 2045.
 *
 * This is a direct JavaScript reimplementation of the original C code
 * as found in the Exim mail transport agent, by Philip Hazel.
 *
 * $Id: base64.js,v 1.7 2002/07/16 17:21:23 kazmer Exp $
 *
 */


function encode_base64( what )
{
	var base64_encodetable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	var result = "";
	var len = what.length;
	var x, y;
	var ptr = 0;

	while( len-- > 0 )
	{
		x = what.charCodeAt( ptr++ );
		result += base64_encodetable.charAt( ( x >> 2 ) & 63 );

		if( len-- <= 0 )
		{
			result += base64_encodetable.charAt( ( x << 4 ) & 63 );
			result += "==";
			break;
		}

		y = what.charCodeAt( ptr++ );
		result += base64_encodetable.charAt( ( ( x << 4 ) | ( ( y >> 4 ) & 15 ) ) & 63 );

		if ( len-- <= 0 )
		{
			result += base64_encodetable.charAt( ( y << 2 ) & 63 );
			result += "=";
			break;
		}

		x = what.charCodeAt( ptr++ );
		result += base64_encodetable.charAt( ( ( y << 2 ) | ( ( x >> 6 ) & 3 ) ) & 63 );
		result += base64_encodetable.charAt( x & 63 );

	}

	return result;
}


function decode_base64( what )
{
	var base64_decodetable = new Array (
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,  62, 255, 255, 255,  63,
		 52,  53,  54,  55,  56,  57,  58,  59,  60,  61, 255, 255, 255, 255, 255, 255,
		255,   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, 255, 255, 255, 255, 255,
		255,  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, 255, 255, 255, 255, 255
	);
	var result = "";
	var len = what.length;
	var x, y;
	var ptr = 0;

	while( !isNaN( x = what.charCodeAt( ptr++ ) ) )
	{
		if( x == 13 || x == 10 )
			continue;

		if( ( x > 127 ) || (( x = base64_decodetable[x] ) == 255) )
			return false;
		if( ( isNaN( y = what.charCodeAt( ptr++ ) ) ) || (( y = base64_decodetable[y] ) == 255) )
			return false;

		result += String.fromCharCode( (x << 2) | (y >> 4) );

		if( (x = what.charCodeAt( ptr++ )) == 61 )
		{
			if( (what.charCodeAt( ptr++ ) != 61) || (!isNaN(what.charCodeAt( ptr ) ) ) )
				return false;
		}
		else
		{
			if( ( x > 127 ) || (( x = base64_decodetable[x] ) == 255) )
				return false;
			result += String.fromCharCode( (y << 4) | (x >> 2) );
			if( (y = what.charCodeAt( ptr++ )) == 61 )
			{
				if( !isNaN(what.charCodeAt( ptr ) ) )
					return false;
			}
			else
			{
				if( (y > 127) || ((y = base64_decodetable[y]) == 255) )
					return false;
				result += String.fromCharCode( (x << 6) | y );
			}
		}
	}
	return result;
}

function wrap76( what )
{
	var result = "";
	var i;

	for(i=0; i < what.length; i+=76)
	{
		result += what.substring(i, i+76) + String.fromCharCode(13) + String.fromCharCode(10);
	}
	return result;
}