OSSL_PARAM_get_long
&& (!OSSL_PARAM_get_long(param_priv_len, &priv_len)
int OSSL_PARAM_get_long(const OSSL_PARAM *p, long int *val);
|| !TEST_true(OSSL_PARAM_get_long(p, &l))
if (!TEST_true(OSSL_PARAM_get_long(¶m, &in)))
res = OSSL_PARAM_get_long(¶m, &val);