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Editing: md5.js

/*
 *  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.
 *
 * -------------------------------------------------------------
 * Modified :
 * - 2003/06/09 by Antoine Pitrou (unicode compatibility)
 * - 29/06/2008 by Renato Formato (avoid global namespace pollution)
 *
 *
 */

(function(){
  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{|}~";
  
  window.calcMD5 = function(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));
   }*/
   for (k=0;k<entree.length;k++) {
     l=entree.charCodeAt(k);
     update(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;
  }
})();