decode something

packetdecrypt.js

function hldsDecrypt()
{
	this.decode_table = [
		0x5A180000,
		0x1A001040,
		0x00104000,
		0x12401040,
		0x40105040,
		0x10504000,
		0x52401000,
		0x40100000,
		0x10081000,
		0x0A181040,
		0x1A184040,
		0x18485000,
		0x4A500040,
		0x50005040,
		0x00585000,
		0x5A581000
	];
}

hldsDecrypt.prototype = {
	packet: function(input) {
		if (input.length > 0x2A) {
			var output = new Buffer(input.length - 0x2A, 'ascii');
			input.copy(output, 0, 0x2A, input.length);
			return output;
		} else {
			return (new Buffer(intput.length));
		}
	},

	clean: function (input) {
		var output = new Buffer(input.length, 'ascii');
		output.fill('\x00');

		var c = 0;
		var xorbase = input.readUInt8(0);
		for (var i = 0; i < input.length; i++) {
			c = input.readUInt8(i);
			if (i >= 8) {
				if (i % 4 == 0 || i % 4 == 3) {
					c ^= xorbase;
				}
				output.writeUInt8(c, i - 8);
			}
		}

		console.log(output);
		return output.slice(0, output.length - 8);
	},

	unclean: function (input, keyin, keyout) {
		var output = new Buffer(input.length + 8, 'ascii');
		output.fill('\x00');

		output.writeUInt32LE(keyout, 0);
		output.writeUInt32LE(keyin, 4);

		var c = 0;
		var xorbase = keyout;
		for (var i = 0; i < input.length; i++) {
			c = input.readUInt8(i);
			if (i % 4 == 0 || i % 4 == 3) {
				c ^= xorbase;
			}
			output.writeUInt8(c & 0xff, i+8);
		}

		console.log(output);
		return output;
	},

	decode: function (input) {
		var output = new Buffer(input.length, 'ascii');
		output.fill('\x00');

		var dw;
		for (var i = 0; i < Math.floor(input.length)/4; i++) {
			if (i * 4 + 4 <= input.length) {
				dw = input.readUInt32BE(i * 4);
				dw ^= this.decode_table[i % this.decode_table.length];
				output.writeInt32LE(dw, i * 4);
			} else {
				console.log('gond lehet');
			}
		}

		console.log(output);
		return output;
	},

	encode: function (input) {
		var output = new Buffer(input.length, 'ascii');
		output.fill('\x00');

		var dw;
		for (var i = 0; i < Math.floor(input.length)/4; i++) {
			if (i * 4 + 4 <= input.length) {
				dw = input.readUInt32LE(i * 4);
				dw ^= this.decode_table[i % this.decode_table.length];
				output.writeInt32BE(dw, i * 4);
			} else {
				console.log('gond lehet');
			}
		}

		console.log(output);
		return output;
	},
};

exports.hldsDecrypt = hldsDecrypt;