FONCTION MD5

/**
 * Message Digest 5 hash code function
 * 
 * @author	Dri
 * @version	1.0
 * 
 * @param	String	message
 * @param	bool	upper_case
 * @param	bool	unicode
 */

function md5(message, upper_case, unicode) {
	
	//misc functions
	
	var add = function(x, y) {
		var lsw = (x & 0xFFFF) + (y & 0xFFFF);
		var msw = (x >>> 16) + (y >>> 16) + (lsw >>> 16);
		return (msw << 16) | (lsw & 0xFFFF);
	}
	
	var rol = function(x, y){
		return (x << y) | (x >>> (32 - y));
	}
	
	var hex = function(abcd) {
		var hex_string = "";
		var hex_buffer = "0123456789abcdef";
								   
		if(upper_case) hex_buffer = hex_buffer.toUpperCase();
		
		for(var i = 0; i < abcd.length; i++) for(var j = 0; j < 32; j += 8)
			hex_string += hex_buffer.charAt( (abcd[i] >> (j+4)) & 0xF) + hex_buffer.charAt( (abcd[i] >> j) & 0xF);
		
		return hex_string;
	}
	
	//md5 functions
	
	var xx = function(q, a, b, x, s, ac) {
		return add(rol(add(add(a, q), add(x, ac)), s),b);
	}
	
	var ff = function(a, b, c, d, x, s, ac) {
		return xx((b & c) | ((~b) & d), a, b, x, s, ac);
	}
	
	var gg = function(a, b, c, d, x, s, ac) {
		return xx((b & d) | (c & (~d)), a, b, x, s, ac);
	}
	
	var hh = function(a, b, c, d, x, s, ac) {
		return xx(b ^ c ^ d, a, b, x, s, ac);
	}
	
	var ii = function(a, b, c, d, x, s, ac) {
		return xx(c ^ (b | (~d)), a, b, x, s, ac);
	}
	
	//message digest buffer
	
	message = message.toString();
	
	var i;
	var buffer = [];
	var char_size = unicode ? 16 : 8;
	var char_mask = (1 << char_size) - 1;
	
	for(i = 0; i < message.length * char_size; i += char_size)
		buffer[i >> 5] |= (message.charCodeAt(i / char_size) & char_mask) << (i & 0x1F);
	
	//message digest padding
	
	buffer[i >> 5] |= 0x80 << (i & 0x1F);
	buffer[(((i + 64) >>> 5) & ~0xF) + 14] = i;
	
	//message digest loop
	
	var a = 0x67452301;
	var b = 0xEFCDAB89;
	var c = 0x98BADCFE;
	var d = 0x10325476;
	
	for(i = 0; i < buffer.length; i += 16) {
		var temp_a = a;
		var temp_b = b;
		var temp_c = c;
		var temp_d = d;
		
		a = ff(a, b, c, d, buffer[i+ 0],  7, 0xD76AA478);
		d = ff(d, a, b, c, buffer[i+ 1], 12, 0xE8C7B756);
		c = ff(c, d, a, b, buffer[i+ 2], 17, 0x242070DB);
		b = ff(b, c, d, a, buffer[i+ 3], 22, 0xC1BDCEEE);
		a = ff(a, b, c, d, buffer[i+ 4],  7, 0xF57C0FAF);
		d = ff(d, a, b, c, buffer[i+ 5], 12, 0x4787C62A);
		c = ff(c, d, a, b, buffer[i+ 6], 17, 0xA8304613);
		b = ff(b, c, d, a, buffer[i+ 7], 22, 0xFD469501);
		a = ff(a, b, c, d, buffer[i+ 8],  7, 0x698098D8);
		d = ff(d, a, b, c, buffer[i+ 9], 12, 0x8B44F7AF);
		c = ff(c, d, a, b, buffer[i+10], 17, 0xFFFF5BB1);
		b = ff(b, c, d, a, buffer[i+11], 22, 0x895CD7BE);
		a = ff(a, b, c, d, buffer[i+12],  7, 0x6B901122);
		d = ff(d, a, b, c, buffer[i+13], 12, 0xFD987193);
		c = ff(c, d, a, b, buffer[i+14], 17, 0xA679438E);
		b = ff(b, c, d, a, buffer[i+15], 22, 0x49B40821);
		
		a = gg(a, b, c, d, buffer[i+ 1],  5, 0xF61E2562);
		d = gg(d, a, b, c, buffer[i+ 6],  9, 0xC040B340);
		c = gg(c, d, a, b, buffer[i+11], 14, 0x265E5A51);
		b = gg(b, c, d, a, buffer[i+ 0], 20, 0xE9B6C7AA);
		a = gg(a, b, c, d, buffer[i+ 5],  5, 0xD62F105D);
		d = gg(d, a, b, c, buffer[i+10],  9, 0x02441453);
		c = gg(c, d, a, b, buffer[i+15], 14, 0xD8A1E681);
		b = gg(b, c, d, a, buffer[i+ 4], 20, 0xE7D3FBC8);
		a = gg(a, b, c, d, buffer[i+ 9],  5, 0x21E1CDE6);
		d = gg(d, a, b, c, buffer[i+14],  9, 0xC33707D6);
		c = gg(c, d, a, b, buffer[i+ 3], 14, 0xF4D50D87);
		b = gg(b, c, d, a, buffer[i+ 8], 20, 0x455A14ED);
		a = gg(a, b, c, d, buffer[i+13],  5, 0xA9E3E905);
		d = gg(d, a, b, c, buffer[i+ 2],  9, 0xFCEFA3F8);
		c = gg(c, d, a, b, buffer[i+ 7], 14, 0x676F02D9);
		b = gg(b, c, d, a, buffer[i+12], 20, 0x8D2A4C8A);
		
		a = hh(a, b, c, d, buffer[i+ 5],  4, 0xFFFA3942);
		d = hh(d, a, b, c, buffer[i+ 8], 11, 0x8771F681);
		c = hh(c, d, a, b, buffer[i+11], 16, 0x6D9D6122);
		b = hh(b, c, d, a, buffer[i+14], 23, 0xFDE5380C);
		a = hh(a, b, c, d, buffer[i+ 1],  4, 0xA4BEEA44);
		d = hh(d, a, b, c, buffer[i+ 4], 11, 0x4BDECFA9);
		c = hh(c, d, a, b, buffer[i+ 7], 16, 0xF6BB4B60);
		b = hh(b, c, d, a, buffer[i+10], 23, 0xBEBFBC70);
		a = hh(a, b, c, d, buffer[i+13],  4, 0x289B7EC6);
		d = hh(d, a, b, c, buffer[i+ 0], 11, 0xEAA127FA);
		c = hh(c, d, a, b, buffer[i+ 3], 16, 0xD4EF3085);
		b = hh(b, c, d, a, buffer[i+ 6], 23, 0x04881D05);
		a = hh(a, b, c, d, buffer[i+ 9],  4, 0xD9D4D039);
		d = hh(d, a, b, c, buffer[i+12], 11, 0xE6DB99E5);
		c = hh(c, d, a, b, buffer[i+15], 16, 0x1FA27CF8);
		b = hh(b, c, d, a, buffer[i+ 2], 23, 0xC4AC5665);
		
		a = ii(a, b, c, d, buffer[i+ 0],  6, 0xF4292244);
		d = ii(d, a, b, c, buffer[i+ 7], 10, 0x432AFF97);
		c = ii(c, d, a, b, buffer[i+14], 15, 0xAB9423A7);
		b = ii(b, c, d, a, buffer[i+ 5], 21, 0xFC93A039);
		a = ii(a, b, c, d, buffer[i+12],  6, 0x655B59C3);
		d = ii(d, a, b, c, buffer[i+ 3], 10, 0x8F0CCC92);
		c = ii(c, d, a, b, buffer[i+10], 15, 0xFFEFF47D);
		b = ii(b, c, d, a, buffer[i+ 1], 21, 0x85845DD1);
		a = ii(a, b, c, d, buffer[i+ 8],  6, 0x6FA87E4F);
		d = ii(d, a, b, c, buffer[i+15], 10, 0xFE2CE6E0);
		c = ii(c, d, a, b, buffer[i+ 6], 15, 0xA3014314);
		b = ii(b, c, d, a, buffer[i+13], 21, 0x4E0811A1);
		a = ii(a, b, c, d, buffer[i+ 4],  6, 0xF7537E82);
		d = ii(d, a, b, c, buffer[i+11], 10, 0xBD3AF235);
		c = ii(c, d, a, b, buffer[i+ 2], 15, 0x2AD7D2BB);
		b = ii(b, c, d, a, buffer[i+ 9], 21, 0xEB86D391);
		
		a = add(a, temp_a);
		b = add(b, temp_b);
		c = add(c, temp_c);
		d = add(d, temp_d);
	}
	
	return hex( [a, b, c, d] );
}