Decrypt hash or block table or a sector.

def _decrypt(self, data, key):
        """Decrypt hash or block table or a sector."""
        seed1 = key
        seed2 = 0xEEEEEEEE
        result = BytesIO()

        for i in range(len(data) // 4):
            seed2 += self.encryption_table[0x400 + (seed1 & 0xFF)]
            seed2 &= 0xFFFFFFFF
            value = struct.unpack("<I", data[i*4:i*4+4])[0]
            value = (value ^ (seed1 + seed2)) & 0xFFFFFFFF

            seed1 = ((~seed1 << 0x15) + 0x11111111) | (seed1 >> 0x0B)
            seed1 &= 0xFFFFFFFF
            seed2 = value + seed2 + (seed2 << 5) + 3 & 0xFFFFFFFF

            result.write(struct.pack("<I", value))

        return result.getvalue()