Add a generic abstraction for GSM/3G authentication algorithms
Indiidual algorithms can be implemented as plugins. libosmogsm itself
only provides COMP128v1 via this generic interface.
diff --git a/src/gsm/auth_comp128v1.c b/src/gsm/auth_comp128v1.c
new file mode 100644
index 0000000..2e1ad2c
--- /dev/null
+++ b/src/gsm/auth_comp128v1.c
@@ -0,0 +1,47 @@
+
+/* GSM/GPRS/3G authentication core infrastructure */
+
+/* (C) 2010-2011 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <osmocom/crypt/auth.h>
+#include <osmocom/gsm/comp128.h>
+
+static int c128v1_gen_vec(struct osmo_auth_vector *vec,
+ struct osmo_sub_auth_data *aud,
+ const uint8_t *_rand)
+{
+ comp128(aud->gsm.ki, _rand, vec->sres, vec->kc);
+ vec->auth_types = OSMO_AUTH_TYPE_GSM;
+
+ return 0;
+}
+
+static struct osmo_auth_impl c128v1_alg = {
+ .algo = OSMO_AUTH_ALG_COMP128v1,
+ .name = "COMP128v1 (libosmogsm built-in)",
+ .priority = 1000,
+ .gen_vec = &c128v1_gen_vec,
+};
+
+static __attribute__((constructor)) void on_dso_load_c128(void)
+{
+ osmo_auth_register(&c128v1_alg);
+}