def decrypt(self, data, nounce=None):
if nounce is None:<EOL><INDENT>nounce = self._in_counter.to_bytes(length=<NUM_LIT:8>, byteorder='<STR_LIT>')<EOL>self._in_counter += <NUM_LIT:1><EOL><DEDENT>decrypted = self._enc_in.open(<EOL>b'<STR_LIT>' + nounce, data, bytes())<EOL>if not decrypted:<EOL><INDENT>raise Exception('<STR_LIT>')  <EOL><DEDENT>return bytes(decrypted)<EOL>
Decrypt data with counter or specified nounce.