Added pgpkeyid account setting, send signed presence

src/pgp/gpg.c

@@ -42,8 +42,12 @@
 #include "pgp/gpg.h"
 #include "log.h"
 
+#define PGP_FOOTER "-----END PGP SIGNATURE-----"
+
 static const char *libversion;
 
+static char* _remove_header_footer(char *str);
+
 void
 p_gpg_init(void)
 {
@@ -62,7 +66,7 @@ p_gpg_list_keys(void)
 
     error = gpgme_new(&ctx);
     if (error) {
-        log_error("GPG: Could not list keys: %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        log_error("GPG: Could not list keys. %s %s", gpgme_strsource(error), gpgme_strerror(error));
         return NULL;
     }
 
@@ -84,7 +88,7 @@ p_gpg_list_keys(void)
             gpgme_key_release(key);
         }
     } else {
-        log_error("GPG: Could not list keys: %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        log_error("GPG: Could not list keys. %s %s", gpgme_strsource(error), gpgme_strerror(error));
     }
 
     gpgme_release(ctx);
@@ -107,4 +111,89 @@ p_gpg_free_key(ProfPGPKey *key)
         free(key->fp);
         free(key);
     }
+}
+
+char*
+p_gpg_sign_str(const char * const str, const char * const fp)
+{
+	gpgme_ctx_t ctx;
+	gpgme_error_t error = gpgme_new(&ctx);
+	if (error) {
+        log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+		return NULL;
+	}
+
+	gpgme_key_t key = NULL;
+	error = gpgme_get_key(ctx, fp, &key, 1);
+	if (error || key == NULL) {
+        log_error("GPG: Failed to get key. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+		gpgme_release (ctx);
+		return NULL;
+	}
+
+	gpgme_signers_clear(ctx);
+	error = gpgme_signers_add(ctx, key);
+	if (error) {
+        log_error("GPG: Failed to load signer. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+		gpgme_release(ctx);
+		return NULL;
+	}
+
+	gpgme_data_t str_data;
+	gpgme_data_t signed_data;
+    char *str_or_empty = NULL;
+    if (str) {
+        str_or_empty = strdup(str);
+    } else {
+        str_or_empty = strdup("");
+    }
+	gpgme_data_new_from_mem(&str_data, str_or_empty, strlen(str_or_empty), 1);
+	gpgme_data_new(&signed_data);
+
+	gpgme_set_armor(ctx,1);
+	error = gpgme_op_sign(ctx,str_data,signed_data,GPGME_SIG_MODE_DETACH);
+	if (error) {
+        log_error("GPG: Failed to sign string. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+		gpgme_release(ctx);
+		return NULL;
+	}
+
+    char *result = NULL;
+	gpgme_data_release(str_data);
+
+    size_t len = 0;
+	char *signed_str = gpgme_data_release_and_get_mem(signed_data, &len);
+	if (signed_str != NULL) {
+		signed_str[len] = 0;
+		result = _remove_header_footer(signed_str);
+	}
+	gpgme_free(signed_str);
+	gpgme_release(ctx);
+    free(str_or_empty);
+
+	return result;
+}
+
+static char*
+_remove_header_footer(char *str)
+{
+	char *pointer = str;
+
+	int newlines = 0;
+	while (newlines < 3) {
+		if (pointer[0] == '\n') {
+			newlines++;
+        }
+		pointer++;
+
+		if (strlen(pointer) == 0) {
+			return NULL;
+        }
+	}
+
+	char *stripped = malloc(strlen(pointer)+1-strlen(PGP_FOOTER));
+	strncpy(stripped,pointer,strlen(pointer)-strlen(PGP_FOOTER));
+	stripped[strlen(pointer)-strlen(PGP_FOOTER)] = '\0';
+
+	return stripped;
 }

src/pgp/gpg.h

@@ -45,5 +45,6 @@ void p_gpg_init(void);
 GSList* p_gpg_list_keys(void);
 const char* p_gpg_libver(void);
 void p_gpg_free_key(ProfPGPKey *key);
+char* p_gpg_sign_str(const char * const str, const char * const fp);
 
 #endif