/*****************************************************************************
 * md5.javascript
 *
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 
 * Message-Digest Algorithm.
 *
 *****************************************************************************/
 /* to convert strings to a list of ascii values */
 
 var sAscii = " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 var sAscii = sAscii + "[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
 
 /* convert integer to hex string */var sHex = "0123456789ABCDEF";
 function hex(i){
    h = "";
    for(j = 0; j <= 3; j++)  {
       h += sHex.charAt((i >> (j * 8 + 4)) & 0x0F) + sHex.charAt((i >> (j * 8)) & 0x0F);
       }
    return h;
 }
 
 /* add, handling overflows correctly */
 function add(x, y){
   return ((x&0x7FFFFFFF) + (y&0x7FFFFFFF)) ^ (x&0x80000000) ^ (y&0x80000000);
 }
   
 /* MD5 rounds functions */
 function R1(A, B, C, D, X, S, T){
    q = add(add(A, (B & C) | (~B & D)), add(X, T)); 
    return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B);
 }
 
 function R2(A, B, C, D, X, S, T){
    q = add(add(A, (B & D) | (C & ~D)), add(X, T)); 
    return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B);
 }
 
 function R3(A, B, C, D, X, S, T){
    q = add(add(A, B ^ C ^ D), add(X, T)); 
    return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B);
 }
 
 function R4(A, B, C, D, X, S, T){  q = add(add(A, C ^ (B | ~D)), add(X, T));  
    return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B);
 }
 
 /* main entry point */
 
 function calcMD5(sInp) {
  /* Calculate length in machine words, including padding */
  wLen = (((sInp.length + 8) >> 6) + 1) << 4;
  var X = new Array(wLen); 
  /* Convert string to array of words */
  j = 4;
  for (i = 0; (i * 4) < sInp.length; i++){
      X[i] = 0;
      for (j = 0; (j < 4) && ((j + i * 4) < sInp.length); j++){  
          X[i] += (sAscii.indexOf(sInp.charAt((i * 4) + j)) + 32) << (j * 8);
      }
  }
  /* Append padding bits and length */
  
  if (j == 4){
      X[i++] = 0x80;
  }
  else {
      X[i - 1] += 0x80 << (j * 8);
  }
  for(; i < wLen; i++){
      X[i] = 0;
  }
  X[wLen - 2] = sInp.length * 8;
  /* hard coded initial values */
  a = 0x67452301;
  b = 0xefcdab89;
  c = 0x98badcfe;  
  d = 0x10325476;
  /* Process each 16 word block in turn */
  for (i = 0; i < wLen; i += 16) {
      aO = a;
      bO = b;    
      cO = c;    
      dO = d;    
      a = R1(a, b, c, d, X[i+ 0], 7 , 0xd76aa478);    
      d = R1(d, a, b, c, X[i+ 1], 12, 0xe8c7b756);    
      c = R1(c, d, a, b, X[i+ 2], 17, 0x242070db);    
      b = R1(b, c, d, a, X[i+ 3], 22, 0xc1bdceee);          
      a = R1(a, b, c, d, X[i+ 4], 7 , 0xf57c0faf);    
      d = R1(d, a, b, c, X[i+ 5], 12, 0x4787c62a);    
      c = R1(c, d, a, b, X[i+ 6], 17, 0xa8304613);    
      b = R1(b, c, d, a, X[i+ 7], 22, 0xfd469501);    
      a = R1(a, b, c, d, X[i+ 8], 7 , 0x698098d8);    
      d = R1(d, a, b, c, X[i+ 9], 12, 0x8b44f7af);    
      c = R1(c, d, a, b, X[i+10], 17, 0xffff5bb1);    
      b = R1(b, c, d, a, X[i+11], 22, 0x895cd7be);    
      a = R1(a, b, c, d, X[i+12], 7 , 0x6b901122);    
      d = R1(d, a, b, c, X[i+13], 12, 0xfd987193);    
      c = R1(c, d, a, b, X[i+14], 17, 0xa679438e);    
      b = R1(b, c, d, a, X[i+15], 22, 0x49b40821);    
      
      
      a = R2(a, b, c, d, X[i+ 1], 5 , 0xf61e2562);    
      d = R2(d, a, b, c, X[i+ 6], 9 , 0xc040b340);    
      c = R2(c, d, a, b, X[i+11], 14, 0x265e5a51);    
      b = R2(b, c, d, a, X[i+ 0], 20, 0xe9b6c7aa);    
      a = R2(a, b, c, d, X[i+ 5], 5 , 0xd62f105d);    
      d = R2(d, a, b, c, X[i+10], 9 ,  0x2441453);    
      c = R2(c, d, a, b, X[i+15], 14, 0xd8a1e681);    
      b = R2(b, c, d, a, X[i+ 4], 20, 0xe7d3fbc8);    
      a = R2(a, b, c, d, X[i+ 9], 5 , 0x21e1cde6);    
      d = R2(d, a, b, c, X[i+14], 9 , 0xc33707d6);    
      c = R2(c, d, a, b, X[i+ 3], 14, 0xf4d50d87);    
      b = R2(b, c, d, a, X[i+ 8], 20, 0x455a14ed);    
      a = R2(a, b, c, d, X[i+13], 5 , 0xa9e3e905);    
      d = R2(d, a, b, c, X[i+ 2], 9 , 0xfcefa3f8);    
      c = R2(c, d, a, b, X[i+ 7], 14, 0x676f02d9);    
      b = R2(b, c, d, a, X[i+12], 20, 0x8d2a4c8a);    
      
      
      a = R3(a, b, c, d, X[i+ 5], 4 , 0xfffa3942);    
      d = R3(d, a, b, c, X[i+ 8], 11, 0x8771f681);    
      c = R3(c, d, a, b, X[i+11], 16, 0x6d9d6122);    
      b = R3(b, c, d, a, X[i+14], 23, 0xfde5380c);    
      a = R3(a, b, c, d, X[i+ 1], 4 , 0xa4beea44);    
      d = R3(d, a, b, c, X[i+ 4], 11, 0x4bdecfa9);    
      c = R3(c, d, a, b, X[i+ 7], 16, 0xf6bb4b60);    
      b = R3(b, c, d, a, X[i+10], 23, 0xbebfbc70);    
      a = R3(a, b, c, d, X[i+13], 4 , 0x289b7ec6);    
      d = R3(d, a, b, c, X[i+ 0], 11, 0xeaa127fa);    
      c = R3(c, d, a, b, X[i+ 3], 16, 0xd4ef3085);    
      b = R3(b, c, d, a, X[i+ 6], 23,  0x4881d05);    
      a = R3(a, b, c, d, X[i+ 9], 4 , 0xd9d4d039);    
      d = R3(d, a, b, c, X[i+12], 11, 0xe6db99e5);    
      c = R3(c, d, a, b, X[i+15], 16, 0x1fa27cf8);    
      b = R3(b, c, d, a, X[i+ 2], 23, 0xc4ac5665);    
      
      
      a = R4(a, b, c, d, X[i+ 0], 6 , 0xf4292244);    
      d = R4(d, a, b, c, X[i+ 7], 10, 0x432aff97);    
      c = R4(c, d, a, b, X[i+14], 15, 0xab9423a7);    
      b = R4(b, c, d, a, X[i+ 5], 21, 0xfc93a039);    
      a = R4(a, b, c, d, X[i+12], 6 , 0x655b59c3);    
      d = R4(d, a, b, c, X[i+ 3], 10, 0x8f0ccc92);    
      c = R4(c, d, a, b, X[i+10], 15, 0xffeff47d);    
      b = R4(b, c, d, a, X[i+ 1], 21, 0x85845dd1);    
      a = R4(a, b, c, d, X[i+ 8], 6 , 0x6fa87e4f);    
      d = R4(d, a, b, c, X[i+15], 10, 0xfe2ce6e0);    
      c = R4(c, d, a, b, X[i+ 6], 15, 0xa3014314);    
      b = R4(b, c, d, a, X[i+13], 21, 0x4e0811a1);    
      a = R4(a, b, c, d, X[i+ 4], 6 , 0xf7537e82);    
      d = R4(d, a, b, c, X[i+11], 10, 0xbd3af235);    
      c = R4(c, d, a, b, X[i+ 2], 15, 0x2ad7d2bb);    
      b = R4(b, c, d, a, X[i+ 9], 21, 0xeb86d391);    

      a = add(a, aO);
      b = add(b, bO);    
      c = add(c, cO);    
      d = add(d, dO);  
   }
   return hex(a) + hex(b) + hex(c) + hex(d);
}