tests: Add new --pss option to fipsdrv
* tests/fipsdrv.c (run_rsa_sign, run_rsa_verify): Set salt-length to 0 for PSS.
Add new --pss option to fipsdrv to specify RSA-PSS signature encoding.
Added by wk:
- Help string for --pss
- Check that only --pss or --pkcs1 is given.
- Signed-off-by: Werner Koch <wk@gnupg.org>