EVP_PKEY_get_raw_private_key
if (!EVP_PKEY_get_raw_private_key(pk, prv->ed25519_sk, &len)) {
int EVP_PKEY_get_raw_private_key(const EVP_PKEY *pkey, unsigned char *priv,
|| (!pub && !TEST_true(EVP_PKEY_get_raw_private_key(pkey, NULL, &len)))
if ((!pub && !TEST_false(EVP_PKEY_get_raw_private_key(pkey, shortbuf, &shortlen)))
if ((!pub && !TEST_true(EVP_PKEY_get_raw_private_key(pkey, buf, &len)))
|| !TEST_int_eq(EVP_PKEY_get_raw_private_key(pkey, NULL, &len), 1)
|| !TEST_int_eq(EVP_PKEY_get_raw_private_key(pkey, priv, &len), 1)