fixed char buffer signedness issue

1 files changed, 6 insertions, 2 deletions

diff --git a/src/openssl.c b/src/openssl.c
index 2bb5d70..cb7470a 100644
--- a/src/openssl.c
+++ b/src/openssl.c
@@ -1755,10 +1755,14 @@ static BN_CTX *getctx(lua_State *L) {
 
 static int bn_tobin(lua_State *L) {
         BIGNUM *bn = checksimple(L, 1, BIGNUM_CLASS);
-        size_t len = BN_num_bytes(bn);
-        unsigned char* dst = lua_newuserdata(L, len);
+        size_t len;
+        void *dst;
+
+        len = BN_num_bytes(bn);
+        dst = lua_newuserdata(L, len);
         BN_bn2bin(bn, dst);
         lua_pushlstring(L, dst, len);
+
         return 1;
 } /* bn_tobin() */