Add signing and verification to the signature package

vendor/github.com/mtrmac/gpgme/go_gpgme.c

@@ -0,0 +1,81 @@
+#include "go_gpgme.h"
+
+unsigned int key_revoked(gpgme_key_t k) {
+	return k->revoked;
+}
+
+unsigned int key_expired(gpgme_key_t k) {
+	return k->expired;
+}
+
+unsigned int key_disabled(gpgme_key_t k) {
+	return k->disabled;
+}
+
+unsigned int key_invalid(gpgme_key_t k) {
+	return k->invalid;
+}
+
+unsigned int key_can_encrypt(gpgme_key_t k) {
+	return k->can_encrypt;
+}
+
+unsigned int key_can_sign(gpgme_key_t k) {
+	return k->can_sign;
+}
+
+unsigned int key_can_certify(gpgme_key_t k) {
+	return k->can_certify;
+}
+
+unsigned int key_secret(gpgme_key_t k) {
+	return k->secret;
+}
+
+unsigned int key_can_authenticate(gpgme_key_t k) {
+	return k->can_authenticate;
+}
+
+unsigned int key_is_qualified(gpgme_key_t k) {
+	return k->is_qualified;
+}
+
+unsigned int signature_wrong_key_usage(gpgme_signature_t s) {
+    return s->wrong_key_usage;
+}
+
+unsigned int signature_pka_trust(gpgme_signature_t s) {
+    return s->pka_trust;
+}
+
+unsigned int signature_chain_model(gpgme_signature_t s) {
+    return s->chain_model;
+}
+
+extern unsigned int subkey_revoked(gpgme_subkey_t k) {
+	return k->revoked;
+}
+
+extern unsigned int subkey_expired(gpgme_subkey_t k) {
+	return k->expired;
+}
+
+extern unsigned int subkey_disabled(gpgme_subkey_t k) {
+	return k->disabled;
+}
+
+extern unsigned int subkey_invalid(gpgme_subkey_t k) {
+	return k->invalid;
+}
+
+extern unsigned int subkey_secret(gpgme_subkey_t k) {
+	return k->secret;
+}
+
+unsigned int uid_revoked(gpgme_user_id_t u) {
+	return u->revoked;
+}
+
+unsigned int uid_invalid(gpgme_user_id_t u) {
+	return u->invalid;
+}