Migrate from OpenSSL to osmo_get_rand_id()

This avoids potential licensing incompatibility and makes integration of
Debian packaging patches easier.

Change-Id: Ia57bf1300525cf3c247284fe966b1c415c2d53e2
Related: OS#1694

configure.ac

@@ -46,7 +46,6 @@ PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 0.9.5)
 PKG_CHECK_MODULES(LIBOSMOABIS, libosmoabis >= 0.2.0)
 PKG_CHECK_MODULES(LIBOSMONETIF, libosmo-netif >= 0.0.1)
 PKG_CHECK_MODULES(LIBOSMOSIGTRAN, libosmo-sigtran) # TODO version?
-PKG_CHECK_MODULES(LIBCRYPTO, libcrypto >= 0.9.5)
 PKG_CHECK_MODULES(LIBOSMOLEGACYMGCP, libosmo-legacy-mgcp >= 0.0.1)
 PKG_CHECK_MODULES(LIBOSMOSCCP, libosmo-sccp >= 0.0.2)
 

debian/control

@@ -11,7 +11,6 @@ Build-Depends: debhelper (>=9),
                pkg-config,
                python-minimal,
                libdbi-dev,
-               libssl-dev,
                libsctp-dev,
                libtalloc-dev,
                libasn1c-dev,

src/osmo-bsc_nat/Makefile.am

@@ -14,7 +14,6 @@ AM_CFLAGS = \
 	$(LIBOSMOABIS_CFLAGS) \
 	$(LIBOSMONETIF_CFLAGS) \
 	$(LIBOSMOLEGACYMGCP_CFLAGS) \
-	$(LIBCRYPTO_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
@@ -55,7 +54,6 @@ osmo_bsc_nat_LDADD = \
 	$(LIBOSMONETIF_LIBS) \
 	$(LIBOSMOSIGTRAN_LIBS) \
 	$(LIBOSMOLEGACYMGCP_LIBS) \
-	$(LIBCRYPTO_LIBS) \
 	$(LIBRARY_GSM) \
 	-lrt \
 	$(NULL)

src/osmo-bsc_nat/bsc_nat.c

@@ -74,8 +74,6 @@
 
 #include <osmocom/abis/ipa.h>
 
-#include <openssl/rand.h>
-
 #include "../../bscconfig.h"
 
 #define SCCP_CLOSE_TIME 20
@@ -221,7 +219,7 @@ static void send_id_req(struct bsc_nat *nat, struct bsc_connection *bsc)
 	buf = v_put(buf, 0x23);
 	mrand = bsc->last_rand;
 
-	if (RAND_bytes(mrand, 16) != 1)
+	if (osmo_get_rand_id(mrand, 16) < 0)
 		goto failed_random;
 
 	memcpy(buf, mrand, 16);

tests/channel/Makefile.am

@@ -29,6 +29,5 @@ channel_test_LDADD = \
 	$(top_builddir)/src/libcommon/libcommon.a \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
-	$(LIBCRYPTO_LIBS) \
 	-ldbi \
 	$(NULL)