/* Load and unload a provider */
OSSL_PROVIDER *OSSL_PROVIDER_load(OPENSSL_CTX *, const char *name);
+OSSL_PROVIDER *OSSL_PROVIDER_try_load(OPENSSL_CTX *, const char *name);
int OSSL_PROVIDER_unload(OSSL_PROVIDER *prov);
int OSSL_PROVIDER_available(OPENSSL_CTX *, const char *name);
int OSSL_PROVIDER_do_all(OPENSSL_CTX *ctx,