--- /dev/null
+/* -*-c-*-
+ *
+ * Parse group description strings
+ *
+ * (c) 2004 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Trivial IP Encryption (TrIPE).
+ *
+ * TrIPE is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * TrIPE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with TrIPE; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include "group.h"
+#include "dh.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @group_parse@ --- *
+ *
+ * Arguments: @qd_parse *qd@ = quick-and-dirty parser
+ *
+ * Returns: Group pointer, or null for failure.
+ *
+ * Use: Parses a group description and returns the group. This has
+ * the form `TYPE { SPEC }' where TYPE is `prime' or `ec', and
+ * SPEC is the appropriate kind of group specification of the
+ * given type.
+ */
+
+group *group_parse(qd_parse *qd)
+{
+ group *g = 0;
+
+ switch (qd_enum(qd, "prime,ec")) {
+ case 0: {
+ dh_param dp;
+ qd_delim(qd, '{');
+ if (dh_parse(qd, &dp)) goto ouch;
+ qd_delim(qd, '}');
+ g = group_prime(&dp);
+ dh_paramfree(&dp);
+ } break;
+ case 1: {
+ ec_info ei;
+ qd_delim(qd, '{');
+ if (ec_infoparse(qd, &ei)) goto ouch;
+ qd_delim(qd, '}');
+ g = group_ec(&ei);
+ } break;
+ }
+ if (!g) qd->e = "bad group parameters";
+ouch:
+ return (g);
+}
+
+/* --- @group_fromstring@ --- *
+ *
+ * Arguments: @const char *p@ = pointer to string to read
+ * @group **gg@ = where to put the group pointer
+ *
+ * Returns: Null if OK, or an error string.
+ *
+ * Use: Parses a group spec from a string, and returns the group.
+ */
+
+const char *group_fromstring(const char *p, group **gg)
+{
+ group *g;
+ qd_parse qd;
+
+ qd.p = p;
+ qd.e = 0;
+ if ((g = group_parse(&qd)) == 0) return (qd.e);
+ if (!qd_eofp(&qd)) { G_DESTROYGROUP(g); return ("junk at end of string"); }
+ *gg = g;
+ return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/