ossl_dsa_key_from_pkcs8
DSA *dsa = ossl_dsa_key_from_pkcs8(p8, NULL, NULL);
DSA *ossl_dsa_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
(key_from_pkcs8_t *)ossl_dsa_key_from_pkcs8);