OSSL_STORE_INFO_get0_PKEY
EVP_PKEY_print_private(out, OSSL_STORE_INFO_get0_PKEY(info),
PEM_write_bio_PrivateKey(out, OSSL_STORE_INFO_get0_PKEY(info),
EVP_PKEY *OSSL_STORE_INFO_get0_PKEY(const OSSL_STORE_INFO *info);