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.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/gsm/auth_comp128v1.c b/src/gsm/auth_comp128v1.c
new file mode 100644
index 00000000..2e1ad2c9
--- /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);
+}