
Returns the key id of the message's signor, or 0 if the message is not signed.
Returns true if the signature is good, false otherwise.
More detail:
1means the signature was actually checked
2means "signed=yes" was read as an attribute from cache
0BAD SIGNATURE!
undefmessage was not signed
Checks the OpenPGP signature on $message. Returns the real (binary) key id if the signature is valid. Raises an exception on error.
Warning: slow. It is best to cache the result, if possible.
Given PGP-signed $message, returns the plaintext of that message. Throws an exception on error.
In array context, returns an list (data, signature), where data is a Crypt::OpenPGP::PlainText and signature isa Crypt::OpenPGP::Signature ora Crypt::OpenPGP::OnePassSig.

Returns the cached signature; true for "signature ok", false for "signature not ok" (or no signature).

Sets the cached signature to true.