diff --git a/src/db.h b/src/db.h
new file mode 100644
index 0000000..f0545a4
--- /dev/null
+++ b/src/db.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <sqlite3.h>
+
+enum stmt_idx {
+	SEL_BY_IMSI	= 0,
+	UPD_BY_IMSI	= 1,
+	AUC_BY_IMSI	= 2,
+	AUC_UPD_SQN	= 3,
+	_NUM_STMT
+};
+
+struct db_context {
+	char *fname;
+	sqlite3 *db;
+	sqlite3_stmt *stmt[_NUM_STMT];
+};
+
+void db_close(struct db_context *dbc);
+struct db_context *db_open(void *ctx, const char *fname);
+
+#include <osmocom/crypt/auth.h>
+
+/* obtain the authentication data for a given imsi */
+int db_get_auth_data(struct db_context *dbc, const char *imsi,
+		     struct osmo_sub_auth_data *aud2g,
+		     struct osmo_sub_auth_data *aud3g,
+		     uint64_t *suscr_id);
+
+int db_update_sqn(struct db_context *dbc, uint64_t id,
+		      uint64_t new_sqn);
+
+int db_get_auc(struct db_context *dbc, const char *imsi,
+	    struct osmo_auth_vector *vec, unsigned int num_vec,
+	    const uint8_t *rand_auts, const uint8_t *auts);