simplesamlphp / saml2

            }

            /* Make sure that the input key format is the same as the one used to encrypt the key. */

            if ($inputKeyAlgo !== $symKeyInfoAlgo) {

                throw new \Exception(

                    'Algorithm mismatch between input key and key used to encrypt ' .

                    ' the symmetric key for the message. Key was: ' .

                    var_export($inputKeyAlgo, true) . '; message was: ' .

                    var_export($symKeyInfoAlgo, true)

                );

            }

            /** @var XMLSecEnc $encKey */

            $encKey = $symmetricKeyInfo->encryptedCtx;

        } else {

            $symKeyAlgo = $symmetricKey->getAlgorith();

            /* Make sure that the input key has the correct format. */

            if ($inputKeyAlgo !== $symKeyAlgo) {

                throw new \Exception(

                    'Algorithm mismatch between input key and key in message. ' .

                    'Key was: ' . var_export($inputKeyAlgo, true) . '; message was: ' .

                    var_export($symKeyAlgo, true)

                );

            }

            $symmetricKey = $inputKey;

        }