ossl_drbg_verify_digest
if (!ossl_drbg_verify_digest(ctx, libctx, md))
if (md != NULL && !ossl_drbg_verify_digest(ctx, libctx, md))
int ossl_drbg_verify_digest(PROV_DRBG *drbg, OSSL_LIB_CTX *libctx, const EVP_MD *md);