--- res/res_srtp.c	(Asterisk 13.9.1)
+++ res/res_srtp.c	(working copy)
@@ -42,3 +42,7 @@
 #include <srtp/srtp.h>
+#ifdef HAVE_OPENSSL
+#include <openssl/rand.h>
+#else
 #include <srtp/crypto_kernel.h>
+#endif
 
@@ -307,3 +311,7 @@
 {
+#ifdef HAVE_OPENSSL
+	return RAND_bytes(key, len) > 0 ? 0: -1;
+#else
 	return crypto_get_random(key, len) != err_status_ok ? -1: 0;
+#endif
 }