Since the plugin loops through the keys and algorithms to properly decrypt and verify signatures on messages, make the following log point a warning so it doesn't miscommunicate to users that it's a breaking error.
Decryption failed: Algorithm mismatch between input key and key used to encrypt the symmetric key for the message. Key was: 'http://www.w3.org/2001/04/xmlenc#aes256-cbc'; message was: 'http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p'
Since the plugin loops through the keys and algorithms to properly decrypt and verify signatures on messages, make the following log point a warning so it doesn't miscommunicate to users that it's a breaking error.