/*
 *  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;

} // end function


/* 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);

} // end function



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;

} // end function




function shl1(a) {

	a=a%0x80000000;
	if(a&0x40000000==0x40000000) {

		a-=0x40000000;  
		a*=2;
		a+=0x80000000;

	} else {

		a*=2;

	}

	return a;

} // end function



function shl(a,b) {

	a=integer(a);
	b=integer(b);
	for (var i=0;i<b;i++) a=shl1(a);
	return a;

} // end function



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);  

		}

	}

} // end function





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);

		}

	}

} // end function




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);  

		}

	}

} // end function





function not(a) {

	a=integer(a);
	return (0xffffffff-a);

} // end function










/* Here begins 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));

	} // end function



	function G(x,y,z) {

		return or(and(x,z),and(y,not(z)));

	} // end function



	function H(x,y,z) {

		return xor(xor(x,y),z);

	} // end function



	function I(x,y,z) {

		return xor(y ,or(x , not(z)));

	} // end function


	function rotateLeft(a,n) {

		return or(shl(a, n),(shr(a,(32 - n))));

	} // end function


	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;

	} // end function



	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;

	} // end function



	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;

	} // end function



	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;

	} // end function



	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;


	} // end function



	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;

		}

	} // end function



	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);

		}

	} // end function




	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 function





/* 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;

} // end function




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;

} // end function





/* This implement the MD5 test suite */
var testOk=false;
function teste() {

	if (testOk) return;
	document.test.o1.value=MD5(document.test.i1.value);
	document.test.o2.value=MD5(document.test.i2.value);
	document.test.o3.value=MD5(document.test.i3.value);
	document.test.o4.value=MD5(document.test.i4.value);
	document.test.o5.value=MD5(document.test.i5.value);
	document.test.o6.value=MD5(document.test.i6.value);
	document.test.o7.value=MD5(document.test.i7.value);
	testOk=true;

} // end function