-gpg.program::
- Use this custom program instead of "`gpg`" found on `$PATH` when
- making or verifying a PGP signature. The program must support the
- same command-line interface as GPG, namely, to verify a detached
- signature, "`gpg --verify $file - <$signature`" is run, and the
- program is expected to signal a good signature by exiting with
- code 0, and to generate an ASCII-armored detached signature, the
- standard input of "`gpg -bsau $key`" is fed with the contents to be
- signed, and the program is expected to send the result to its
- standard output.
-
-gpg.format::
- Specifies which key format to use when signing with `--gpg-sign`.
- Default is "openpgp" and another possible value is "x509".
-
-gpg.<format>.program::
- Use this to customize the program used for the signing format you
- chose. (see `gpg.program` and `gpg.format`) `gpg.program` can still
- be used as a legacy synonym for `gpg.openpgp.program`. The default
- value for `gpg.x509.program` is "gpgsm".