Add integration with libosmocore gprs crypto support

src/Makefile.am

@@ -7,4 +7,5 @@ AM_CFLAGS = -fPIC -Wall
 
 lib_LTLIBRARIES = libosmo-crypto-a53.la
 
-libosmo_crypto_a53_la_SOURCES = a53f.c kgcore.c kasumi.c
+libosmo_crypto_a53_la_SOURCES = a53f.c kgcore.c kasumi.c osmocom.c
+libosmo_crypto_a53_la_LDFLAGS = -shared

src/osmocom.c

@@ -0,0 +1,36 @@
+
+#include <stdint.h>
+
+#include <osmocom/crypt/gprs_cipher.h>
+
+#include "kasumi.h"
+#include "a53f.h"
+
+static int gea3_run(uint8_t *out, uint16_t len, uint64_t kc, uint32_t iv,
+		     enum gprs_cipher_direction direction)
+{
+	uint8_t dir;
+
+	if (direction == GPRS_CIPH_MS2SGSN)
+		dir = 0;
+	else
+		dir = 1;
+
+	GEA3((uint8_t *)&kc, sizeof(kc), iv, dir, out, len);
+
+	return 0;
+}
+
+static struct gprs_cipher_impl gea3_impl = {
+	.algo = GPRS_ALGO_GEA3,
+	.name = "3GPP Reference implementation of GEA3",
+	.priority = 1000,
+	.run = &gea3_run,
+};
+
+static void __attribute__((constructor)) osmo_crypt_a5_init(void)
+{
+	gprs_cipher_register(&gea3_impl);
+
+	/* FIXME: A5/3 registration */
+}