How to accept only signed, encrypted messages automatically?

[Eelco Vriezekolk]

Hello,

Please CC me, I am not on the list. I've read the docs, searched the list, 
but cannot find an answer.

I have a script that receives, on STDIN, a signed, encrypted file. At least, 
that is the idea; the script ought to reject anything that is not encrypted, 
and anything that is not signed with one of the known public keys. Simple as 
that, I can't get it to work. I am relying on the exitvalue, zero should 
mean "signed with known, trusted signature, decryption OK", any other 
exitvalue should indicate an error.

"gpg --decrypt" will accept messages that are not signed, which is very much 
*not* what I want.

How can I make GnuPG decrypt and make sure that there is a trusted 
signature, and have it indicate to me by exitvalue?

Please CC me, as I am not on the list.

Regards,
-- 
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