gpg-interface: introduce new signature format "x509" using gpgsm

This commit allows git to create and check x509 type signatures using gpgsm. Signed-off-by: Henning Schild <henning.schild@siemens.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Henning Schild committed Jul 17, 2018 at 14:50 UTC 1e7adb97566bff7d3431ce64b8d0d854a6863ed5
2 files changed +18 -2
Documentation/config.txt
+3 -2
@@ -1830,12 +1830,13 @@ gpg.program::
1830
1831 gpg.format::
1832 Specifies which key format to use when signing with `--gpg-sign`.
1833 - Default is "openpgp", that is also the only supported value.
1833 + Default is "openpgp" and another possible value is "x509".
1834
1835 gpg.<format>.program::
1836 Use this to customize the program used for the signing format you
1837 chose. (see `gpg.program` and `gpg.format`) `gpg.program` can still
1838 - be used as a legacy synonym for `gpg.openpgp.program`.
1838 + be used as a legacy synonym for `gpg.openpgp.program`. The default
1839 + value for `gpg.x509.program` is "gpgsm".
1840
1841 gui.commitMsgWidth::
1842 Defines how wide the commit message window is in the
gpg-interface.c
+15
@@ -24,11 +24,23 @@ static const char *openpgp_sigs[] = {
24 NULL
25 };
26
27 +static const char *x509_verify_args[] = {
28 + NULL
29 +};
30 +static const char *x509_sigs[] = {
31 + "-----BEGIN SIGNED MESSAGE-----",
32 + NULL
33 +};
34 +
35 static struct gpg_format gpg_format[] = {
36 { .name = "openpgp", .program = "gpg",
37 .verify_args = openpgp_verify_args,
38 .sigs = openpgp_sigs
39 },
40 + { .name = "x509", .program = "gpgsm",
41 + .verify_args = x509_verify_args,
42 + .sigs = x509_sigs
43 + },
44 };
45
46 static struct gpg_format *use_format = &gpg_format[0];
@@ -192,6 +204,9 @@ int git_gpg_config(const char *var, const char *value, void *cb)
204 if (!strcmp(var, "gpg.program") || !strcmp(var, "gpg.openpgp.program"))
205 fmtname = "openpgp";
206
207 + if (!strcmp(var, "gpg.x509.program"))
208 + fmtname = "x509";
209 +
210 if (fmtname) {
211 fmt = get_format_by_name(fmtname);
212 return git_config_string(&fmt->program, var, value);