def md5_decrypt(data, key):
	reader = StringIO.StringIO(data)
	output = ''
	last_hash = ''

	while 1:
		cur_block = ''
		for i in range(16):
			cur_hash = reader.read(16)
			if len(cur_hash) != 16:
				return output
			cur_block += cur_hash
			cur_byte = '\x00'
			for i in range(0x100):
				md5_ctx = hashlib.md5()
				cur_byte = chr(i)
				md5_ctx.update(cur_byte)
				md5_ctx.update(key)
				md5_ctx.update(last_hash)
				if cur_hash == md5_ctx.digest():
					break
			output += cur_byte
			last_hash = cur_hash
		md5_ctx = hashlib.md5()
		md5_ctx.update(cur_block)
		last_hash = reader.read(16)
		if last_hash != md5_ctx.digest():
			raise Exception("Hash mismatch! Incorrect key or corrupt data")