Encrypt to a key without importing it to keyring

[Seby]

Hello,

Thanks a lot for the reply.

NIIBE Yutaka <gniibe at fsij.org> wrote:
> Seby <seby2kt14 at gmail.com> wrote:
>> Basically use gnupg without a keyring or trustdb. And the pass the armored
>> pgp public key with each command and operation.
>
> AFAIK, such a usage is not supported by GnuPG.
>
> Well, I would imagine some use cases when we want to avoid any
> dependency to specific user's configuration, keyring, and trustdb, of
> his own.
>
> Approximation would be using ephemeral GNUPGHOME.
>
> I mean, starting your GnuPG session (or script) with:
>
>    $ export GNUPGHOME=$(mktemp -p /run/user/$(id -u) -d)
>    $ chmod og-rwx $GNUPGHOME; echo $GNUPGHOME
>
> and remove the $GNUPGHOME after its use.
>
> This is very useful for testing GnuPG, for example.
> --

The use case is that a script encrypts stuff for different public
keys. I don't want to save those public keys to files, then import
them in the keyring, do the operation and then delete from the keyring
because this is a lot of operations plus using files might be
problematic on edge cases.

Am I correct that a way around changing the GNUPGHOME variable is
using the --no-default-keyring argument?

So no way for me to do an operation just by having the public key in
clipboard for example (no saving to file, no import, etc.)?

Seby