* agent/cvt-openpgp.c (scan_pgp_format): New with SOS support.
(do_unprotect): Use scan_pgp_format, handle opaque MPI for ECC.
(convert_from_openpgp_main): Use opaque MPI for ECC.
(apply_protection): Set GCRYMPI_FLAG_USER1 flag for encrypted secret.
(extract_private_key): Use "/qd" for ECC, opaque MPI.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>