+BN_CTX_free() has no return values.
+
+=head1 REMOVED FUNCTIONALITY
+
+ void BN_CTX_init(BN_CTX *c);
+
+BN_CTX_init() is no longer available as of OpenSSL 1.1.0. Applications should
+replace use of BN_CTX_init with BN_CTX_new instead:
+
+ BN_CTX *ctx;
+ ctx = BN_CTX_new();
+ if(!ctx) /* Handle error */
+ ...
+ BN_CTX_free(ctx);