Is it possible to "decrypt" a signed message without the public key?

[skylarmt]

I'd like my application to decode and process the contents of a signed message, even if it can't verify the signature with a public key. I can do this with gpg --decrypt, which gives me the contents of the message along with "Can't check signature: No public key", but kbpgp gives an error.

kbpgp.unbox({keyfetch: keyring, armored: pgpmsg}, function (err, literals) {} should have the message in literals[0].toString() even if the rest of the info (such as literals[0].get_data_signer()) is missing.

[oztechmuse]

I would like to second this - CyberChef uses this function and it caught us out - throwing a cryptic error when trying to decrypt a signed message.