Function fiat_crypto::curve25519_scalar_64::fiat_25519_scalar_opp

pub fn fiat_25519_scalar_opp(
    out1: &mut fiat_25519_scalar_montgomery_domain_field_element,
    arg1: &fiat_25519_scalar_montgomery_domain_field_element
)

The function fiat_25519_scalar_opp negates a field element in the Montgomery domain.

Preconditions: 0 ≤ eval arg1 < m Postconditions: eval (from_montgomery out1) mod m = -eval (from_montgomery arg1) mod m 0 ≤ eval out1 < m