sm: Support generation of card-based ECDSA CSR.
* sm/call-agent.c (gpgsm_scd_pksign): Identify type of signing key and format resulting S-expression accordingly. * sm/misc.c (transform_sigval): Support ECDSA signatures.
Current GpgSM implementation assumes card-based keys are RSA keys.
This patch introduces support for ECDSA keys.
By itself this patch is not sufficient, we also need support
- GnuPG-bug-id: T4092
- Signed-off-by: Damien Goutte-Gattat <firstname.lastname@example.org>