Re: [Cryptix-users] isPGPEncrypted()

[Edwin W. <ed...@wo...>]

--On 17-1-2005 11:11 -0800 Chance Casey <cha...@gm...> wrote:
>
> Is there a non-CPU-intensive way to check if a message is
> PGP-encrypted?  We may need to decrypt messages encrypted in other
> formats so a quick way to check for PGP would be great.

For ascii messages: just check for a line starting with '----- BEGIN PGP'.

For binary messages: that's a bit harder. But using Cryptix OpenPGP's 
MessageFactory it is still easy to do: if it returns an EncryptedMessage, 
you have a valid PGP message. If it throws an exception, returns a 
LiteralMessage or returns nothing: you've got something else.

The latter approach btw also works for ascii messages. It is not very 
cpu-intensive compared to the actual decrypting of the message.

-- 
Edwin