function MD5(){
  this.hex_chr = "0123456789abcdef"; 
}

MD5.prototype.rhex = function(num) 
{ 
	str = ""; 
	for(j = 0; j <= 3; j++) 
	str += this.hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + 
	this.hex_chr.charAt((num >> (j * 8)) & 0x0F); 
	return str; 
} 
MD5.prototype.str2blks_MD5 = function(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; 
} 
MD5.prototype.add = function(x, y) 
{ 
	var lsw = (x & 0xFFFF) + (y & 0xFFFF); 
	var msw = (x >> 16) + (y >> 16) + (lsw >> 16); 
	return (msw << 16) | (lsw & 0xFFFF); 
} 
MD5.prototype.rol = function(num, cnt) 
{ 
	return (num << cnt) | (num >>> (32 - cnt)); 
} 
MD5.prototype.cmn = function(q, a, b, x, s, t) 
{ 
	return this.add(this.rol(this.add(this.add(a, q), this.add(x, t)), s), b); 
} 
MD5.prototype.ff = function(a, b, c, d, x, s, t) 
{ 
	return this.cmn((b & c) | ((~b) & d), a, b, x, s, t); 
} 
MD5.prototype.gg = function(a, b, c, d, x, s, t) 
{ 
	return this.cmn((b & d) | (c & (~d)), a, b, x, s, t); 
} 
MD5.prototype.hh = function(a, b, c, d, x, s, t) 
{ 
	return this.cmn(b ^ c ^ d, a, b, x, s, t); 
} 
MD5.prototype.ii = function(a, b, c, d, x, s, t) 
{ 
	return this.cmn(c ^ (b | (~d)), a, b, x, s, t); 
} 
MD5.prototype.md5 = function(str) 
{ 
	x = this.str2blks_MD5(str); 
	var a = 1732584193; 
	var b = -271733879; 
	var c = -1732584194; 
	var d = 271733878; 
	for(i = 0; i < x.length; i += 16) 
	{ 
		var olda = a; 
		var oldb = b; 
		var oldc = c; 
		var oldd = d; 
		a = this.ff(a, b, c, d, x[i+ 0], 7 , -680876936); 
		d = this.ff(d, a, b, c, x[i+ 1], 12, -389564586); 
		c = this.ff(c, d, a, b, x[i+ 2], 17, 606105819); 
		b = this.ff(b, c, d, a, x[i+ 3], 22, -1044525330); 
		a = this.ff(a, b, c, d, x[i+ 4], 7 , -176418897); 
		d = this.ff(d, a, b, c, x[i+ 5], 12, 1200080426); 
		c = this.ff(c, d, a, b, x[i+ 6], 17, -1473231341); 
		b = this.ff(b, c, d, a, x[i+ 7], 22, -45705983); 
		a = this.ff(a, b, c, d, x[i+ 8], 7 , 1770035416); 
		d = this.ff(d, a, b, c, x[i+ 9], 12, -1958414417); 
		c = this.ff(c, d, a, b, x[i+10], 17, -42063); 
		b = this.ff(b, c, d, a, x[i+11], 22, -1990404162); 
		a = this.ff(a, b, c, d, x[i+12], 7 , 1804603682); 
		d = this.ff(d, a, b, c, x[i+13], 12, -40341101); 
		c = this.ff(c, d, a, b, x[i+14], 17, -1502002290); 
		b = this.ff(b, c, d, a, x[i+15], 22, 1236535329); 
		a = this.gg(a, b, c, d, x[i+ 1], 5 , -165796510); 
		d = this.gg(d, a, b, c, x[i+ 6], 9 , -1069501632); 
		c = this.gg(c, d, a, b, x[i+11], 14, 643717713); 
		b = this.gg(b, c, d, a, x[i+ 0], 20, -373897302); 
		a = this.gg(a, b, c, d, x[i+ 5], 5 , -701558691); 
		d = this.gg(d, a, b, c, x[i+10], 9 , 38016083); 
		c = this.gg(c, d, a, b, x[i+15], 14, -660478335); 
		b = this.gg(b, c, d, a, x[i+ 4], 20, -405537848); 
		a = this.gg(a, b, c, d, x[i+ 9], 5 , 568446438); 
		d = this.gg(d, a, b, c, x[i+14], 9 , -1019803690); 
		c = this.gg(c, d, a, b, x[i+ 3], 14, -187363961); 
		b = this.gg(b, c, d, a, x[i+ 8], 20, 1163531501); 
		a = this.gg(a, b, c, d, x[i+13], 5 , -1444681467); 
		d = this.gg(d, a, b, c, x[i+ 2], 9 , -51403784); 
		c = this.gg(c, d, a, b, x[i+ 7], 14, 1735328473); 
		b = this.gg(b, c, d, a, x[i+12], 20, -1926607734); 
		a = this.hh(a, b, c, d, x[i+ 5], 4 , -378558); 
		d = this.hh(d, a, b, c, x[i+ 8], 11, -2022574463); 
		c = this.hh(c, d, a, b, x[i+11], 16, 1839030562); 
		b = this.hh(b, c, d, a, x[i+14], 23, -35309556); 
		a = this.hh(a, b, c, d, x[i+ 1], 4 , -1530992060); 
		d = this.hh(d, a, b, c, x[i+ 4], 11, 1272893353); 
		c = this.hh(c, d, a, b, x[i+ 7], 16, -155497632); 
		b = this.hh(b, c, d, a, x[i+10], 23, -1094730640); 
		a = this.hh(a, b, c, d, x[i+13], 4 , 681279174); 
		d = this.hh(d, a, b, c, x[i+ 0], 11, -358537222); 
		c = this.hh(c, d, a, b, x[i+ 3], 16, -722521979); 
		b = this.hh(b, c, d, a, x[i+ 6], 23, 76029189); 
		a = this.hh(a, b, c, d, x[i+ 9], 4 , -640364487); 
		d = this.hh(d, a, b, c, x[i+12], 11, -421815835); 
		c = this.hh(c, d, a, b, x[i+15], 16, 530742520); 
		b = this.hh(b, c, d, a, x[i+ 2], 23, -995338651); 
		a = this.ii(a, b, c, d, x[i+ 0], 6 , -198630844); 
		d = this.ii(d, a, b, c, x[i+ 7], 10, 1126891415); 
		c = this.ii(c, d, a, b, x[i+14], 15, -1416354905); 
		b = this.ii(b, c, d, a, x[i+ 5], 21, -57434055); 
		a = this.ii(a, b, c, d, x[i+12], 6 , 1700485571); 
		d = this.ii(d, a, b, c, x[i+ 3], 10, -1894986606); 
		c = this.ii(c, d, a, b, x[i+10], 15, -1051523); 
		b = this.ii(b, c, d, a, x[i+ 1], 21, -2054922799); 
		a = this.ii(a, b, c, d, x[i+ 8], 6 , 1873313359); 
		d = this.ii(d, a, b, c, x[i+15], 10, -30611744); 
		c = this.ii(c, d, a, b, x[i+ 6], 15, -1560198380); 
		b = this.ii(b, c, d, a, x[i+13], 21, 1309151649); 
		a = this.ii(a, b, c, d, x[i+ 4], 6 , -145523070); 
		d = this.ii(d, a, b, c, x[i+11], 10, -1120210379); 
		c = this.ii(c, d, a, b, x[i+ 2], 15, 718787259); 
		b = this.ii(b, c, d, a, x[i+ 9], 21, -343485551); 
		a = this.add(a, olda); 
		b = this.add(b, oldb); 
		c = this.add(c, oldc); 
		d = this.add(d, oldd); 
	} 
	return this.rhex(a) + this.rhex(b) + this.rhex(c) + this.rhex(d); 
}