ossl_curve448_scalar_halve
ossl_curve448_scalar_halve(scalar1x, scalar1x);
ossl_curve448_scalar_halve(the_scalar, the_scalar);
ossl_curve448_scalar_halve(secret_scalar, secret_scalar);
ossl_curve448_scalar_halve(nonce_scalar_2, nonce_scalar);
ossl_curve448_scalar_halve(nonce_scalar_2, nonce_scalar_2);
void ossl_curve448_scalar_halve(curve448_scalar_t out, const curve448_scalar_t a);