/*

 *  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.

 *

 * $Id: md5.js,v 1.4 2004/06/03 09:22:11 marcolivier Exp $

 *

 */



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; 

}