Is gpgme_set_passphrase_cb effectively deprecated?

[Andre Heinecke]

Hi,

On Thursday 3 January 2019 16:51:08 CET Jeroen Ooms wrote:
> I maintain the gpgme bindings for the R programming language, and we
> use a have a custom password entry dialog in the GUI application.
> IIRC, the following code used to work about 2 or 3 years ago:
> 
>   gpgme_set_pinentry_mode(ctx, GPGME_PINENTRY_MODE_LOOPBACK);
>   gpgme_set_passphrase_cb(ctx, cb_fun, payload);
> 
> However I tried this with gpgme 1.11 (Windows) and 1.12 (MacOS), and
> this does not seem to work anymore at all. The cb_fun is never
> invoked, neither with gpg 1.4 nor gpg 2.2.

Strange. It should work with gpg 1.4 and gpg > 2.1 (with the loopback). I have 
a test in the Qt testsuite that uses it. There I have the logic:

static bool decryptSupported()
{
    /* With GnuPG 2.0.x (at least 2.0.26 by default on jessie)
     * the passphrase_cb does not work. So the test popped up
     * a pinentry. So tests requiring decryption don't work. */
    static auto version = GpgME::engineInfo(GpgME::GpgEngine).engineVersion();
    if (version < "2.0.0") {
        /* With 1.4 it just works */
        return true;
    }
    if (version < "2.1.0") {
        /* With 2.1 it works with loopback mode */
        return false;
    }
    return true;
}

The only version for which it does not work is afaik 2.0.x

That is using Protocol / Engine OpenPGP. I think for S/MIME it does not work.

> Also the documentation for gpgme_set_passphrase_cb says "Some engines
> do not even support an external passphrase callback at all, in this
> case the error code GPG_ERR_NOT_SUPPORTED is returned" however the
> function returns void so this seems incorrect.

Indeed.

> I was wondering if it is possible to update the
> gpgme_set_passphrase_cb documentation on the current situation, which
> versions of gnupg it is expected to work, under which
> conditions/settings.

Something else seems wrong in your setup / code. It should work for you.

Maybe take a look at the gpgme log to see more about what happens.

Best Regards,
Andre

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