/*
 * verify form values &
 * implement the Challenge Handshaking Authentication Protocol
 */
function doCHAP_new(){
 
    // get 'password' field
  var pwd=document.forms[0].txt_pwd1.value;
  var pwd2=document.forms[0].txt_pwd2.value;
  var len=pwd.length;
  if ((len<8 && len>0) || (len>12 ))
  {  
    alert('New Password should not be less than 8 and not more than 12 letters');
    return false;
  }
  var Salt=document.forms[0].txtHidSalt_new.value;
 
 // get 'challenge' field
  var chlng;
  var chlng2;
  var clientEnc;
  var str="";
   
  // calculate MD5 hash of password and concatenate challenge value
  // next calculate MD5 hash of combined values
 
  chlng = MD5(pwd);
  chlng2=MD5(pwd2);
  clientEnc=MD5(Salt+chlng);
  
  document.forms[0].txtHidSalt_new.value ="********************";
  document.forms[0].txtHid_new.value=clientEnc;
  
  document.forms[0].txtHid_new2.value=chlng2;

  for (i=0; i<len; i++)
  {
  str=str+'************************';
  }

 document.forms[0].txt_pwd1.value="";
 document.forms[0].txt_pwd2.value="";

  //document.forms[0].TxtPWD.value="";
 }

/*
 * display error messages
 */
//function showError(obj,message){
//  alert(message);
//  obj.focus();
//}
 
function doCHAP(){
 
    // get 'password' field
  var pwd=document.forms[0].txtPassword.value;
  
  var len=pwd.length;
  var Salt=document.forms[0].txtHidSalt.value;
  
 // get 'challenge' field
  var chlng;
  var clientEnc;
  var str="";
   
  // calculate MD5 hash of password and concatenate challenge value
  // next calculate MD5 hash of combined values
 
  chlng = MD5(pwd);
  clientEnc=MD5(Salt+chlng);
  document.forms[0].txtHidSalt.value ="********************";
  document.forms[0].txtHid.value=clientEnc;
   
  //document.forms[0].txtHid.value=chlng;

  for (i=0; i<len; i++)
  {
  str=str+'************************';
  }

  document.forms[0].txtPassword.value="Dummy123!";

  document.forms[0].TxtPWD.value="";
 }

/*
 * display error messages
 */
//function showError(obj,message){
//  alert(message);
//  obj.focus();
//}

function trim(thisvalue)
{
 var result;
 var i=0;
 var j=thisvalue.length-1;
 while ((thisvalue.charCodeAt(i) == 32) && (i<thisvalue.length))
  i++;
 while ((thisvalue.charCodeAt(j) == 32) && (j>0))
  j--;
 j++;
 result=thisvalue.substring(i,j);
 return(result);
}


/* MD5 Algo Code */
var hex_chr = "0123456789ABCDEF";
function rhex(num){
  str = "";
  for(j = 0; j <= 3; j++)
  str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) +
    hex_chr.charAt((num >> (j * 8)) & 0x0F);
  return str;
}
/*
 * Convert a string to a sequence of 16-word blocks, stored as an array.
 * Append padding bits and the length, as described in the MD5 standard.
 */
function str2blks_MD5(str){
  nblk = ((str.length + 8) >> 6) + 1;
  blks = new Array(nblk * 16);
  for(i = 0; i < nblk * 16; i++) blks[i] = 0;
  for(i = 0; i < str.length; i++)
    blks[i >> 2] |= str.charCodeAt(i) << ((i % 4) * 8);
    blks[i >> 2] |= 0x80 << ((i % 4) * 8);
    blks[nblk * 16 - 2] = str.length * 8;
  return blks;
}
/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function add(x, y){
 var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
 return (msw << 16) | (lsw & 0xFFFF);
}
/*
 * Bitwise rotate a 32-bit number to the left
 */
function rol(num, cnt){
  return (num << cnt) | (num >>> (32 - cnt));
}
/*
 * These functions implement the basic operation for each round of the
 * algorithm.
 */
function cmn(q, a, b, x, s, t){
  return add(rol(add(add(a, q), add(x, t)), s), b);
}
function ff(a, b, c, d, x, s, t){
  return cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function gg(a, b, c, d, x, s, t){
  return cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function hh(a, b, c, d, x, s, t){
  return cmn(b ^ c ^ d, a, b, x, s, t);
}
function ii(a, b, c, d, x, s, t){
  return cmn(c ^ (b | (~d)), a, b, x, s, t);
}
/*
 * Take a string and return the hex representation of its MD5.
 */
function MD5(str){
  x = str2blks_MD5(str);
 var a =  1732584193;
  var b = -271733879;
  var c = -1732584194;
  var d =  271733878;
 for(var i = 0; i < x.length; i += 16){
   var olda = a;
   var oldb = b;
    var oldc = c;
    var oldd = d;
    a = ff(a, b, c, d, x[i+ 0], 7 , -680876936);
    d = ff(d, a, b, c, x[i+ 1], 12, -389564586);
    c = ff(c, d, a, b, x[i+ 2], 17,  606105819);
    b = ff(b, c, d, a, x[i+ 3], 22, -1044525330);
    a = ff(a, b, c, d, x[i+ 4], 7 , -176418897);
    d = ff(d, a, b, c, x[i+ 5], 12,  1200080426);
    c = ff(c, d, a, b, x[i+ 6], 17, -1473231341);
    b = ff(b, c, d, a, x[i+ 7], 22, -45705983);
    a = ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
    d = ff(d, a, b, c, x[i+ 9], 12, -1958414417);
    c = ff(c, d, a, b, x[i+10], 17, -42063);
    b = ff(b, c, d, a, x[i+11], 22, -1990404162);
    a = ff(a, b, c, d, x[i+12], 7 ,  1804603682);
    d = ff(d, a, b, c, x[i+13], 12, -40341101);
    c = ff(c, d, a, b, x[i+14], 17, -1502002290);
    b = ff(b, c, d, a, x[i+15], 22,  1236535329);
    a = gg(a, b, c, d, x[i+ 1], 5 , -165796510);
    d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
    c = gg(c, d, a, b, x[i+11], 14,  643717713);
    b = gg(b, c, d, a, x[i+ 0], 20, -373897302);
    a = gg(a, b, c, d, x[i+ 5], 5 , -701558691);
    d = gg(d, a, b, c, x[i+10], 9 ,  38016083);
    c = gg(c, d, a, b, x[i+15], 14, -660478335);
    b = gg(b, c, d, a, x[i+ 4], 20, -405537848);
    a = gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
    d = gg(d, a, b, c, x[i+14], 9 , -1019803690);
    c = gg(c, d, a, b, x[i+ 3], 14, -187363961);
    b = gg(b, c, d, a, x[i+ 8], 20,  1163531501);
    a = gg(a, b, c, d, x[i+13], 5 , -1444681467);
    d = gg(d, a, b, c, x[i+ 2], 9 , -51403784);
    c = gg(c, d, a, b, x[i+ 7], 14,  1735328473);
    b = gg(b, c, d, a, x[i+12], 20, -1926607734);
    a = hh(a, b, c, d, x[i+ 5], 4 , -378558);
    d = hh(d, a, b, c, x[i+ 8], 11, -2022574463);
    c = hh(c, d, a, b, x[i+11], 16,  1839030562);
    b = hh(b, c, d, a, x[i+14], 23, -35309556);
    a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
    d = hh(d, a, b, c, x[i+ 4], 11,  1272893353);
    c = hh(c, d, a, b, x[i+ 7], 16, -155497632);
    b = hh(b, c, d, a, x[i+10], 23, -1094730640);
    a = hh(a, b, c, d, x[i+13], 4 ,  681279174);
    d = hh(d, a, b, c, x[i+ 0], 11, -358537222);
    c = hh(c, d, a, b, x[i+ 3], 16, -722521979);
    b = hh(b, c, d, a, x[i+ 6], 23,  76029189);
    a = hh(a, b, c, d, x[i+ 9], 4 , -640364487);
    d = hh(d, a, b, c, x[i+12], 11, -421815835);
    c = hh(c, d, a, b, x[i+15], 16,  530742520);
    b = hh(b, c, d, a, x[i+ 2], 23, -995338651);
    a = ii(a, b, c, d, x[i+ 0], 6 , -198630844);
    d = ii(d, a, b, c, x[i+ 7], 10,  1126891415);
    c = ii(c, d, a, b, x[i+14], 15, -1416354905);
    b = ii(b, c, d, a, x[i+ 5], 21, -57434055);
    a = ii(a, b, c, d, x[i+12], 6 ,  1700485571);
    d = ii(d, a, b, c, x[i+ 3], 10, -1894986606);
    c = ii(c, d, a, b, x[i+10], 15, -1051523);
    b = ii(b, c, d, a, x[i+ 1], 21, -2054922799);
    a = ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
    d = ii(d, a, b, c, x[i+15], 10, -30611744);
    c = ii(c, d, a, b, x[i+ 6], 15, -1560198380);
    b = ii(b, c, d, a, x[i+13], 21,  1309151649);
    a = ii(a, b, c, d, x[i+ 4], 6 , -145523070);
    d = ii(d, a, b, c, x[i+11], 10, -1120210379);
    c = ii(c, d, a, b, x[i+ 2], 15,  718787259);
    b = ii(b, c, d, a, x[i+ 9], 21, -343485551);
   a = add(a, olda);
   b = add(b, oldb);
    c = add(c, oldc);
    d = add(d, oldd);
  }
  return rhex(a) + rhex(b) + rhex(c) + rhex(d);
}