def decrypt(self, data):
decrypted_data = b"<STR_LIT>"<EOL>for i in range(<NUM_LIT:0>, len(data), <NUM_LIT:8>):<EOL><INDENT>block = data[i:i + <NUM_LIT:8>]<EOL>block_length = len(block)<EOL>if block_length != <NUM_LIT:8>:<EOL><INDENT>raise ValueError("<STR_LIT>"<EOL>"<STR_LIT>")<EOL><DEDENT>decrypted_data += self._decode_block(block)<EOL><DEDENT>return decrypted_data<EOL>
DES decrypts the data based on the key it was initialised with.

:param data: The encrypted bytes string to decrypt
:return: The decrypted bytes string