fn random_sk()

in src/key_exchange/group/ristretto255.rs [46:70]

• 21 lines of code
• 4 McCabe index (conditional complexity)

    fn random_sk<R: RngCore + CryptoRng>(rng: &mut R) -> Self::Sk {
        loop {
            let scalar = {
                #[cfg(not(test))]
                {
                    let mut scalar_bytes = [0u8; 64];
                    rng.fill_bytes(&mut scalar_bytes);
                    Scalar::from_bytes_mod_order_wide(&scalar_bytes)
                }

                // Tests need an exact conversion from bytes to scalar, sampling only 32 bytes
                // from rng
                #[cfg(test)]
                {
                    let mut scalar_bytes = [0u8; 32];
                    rng.fill_bytes(&mut scalar_bytes);
                    Scalar::from_bytes_mod_order(scalar_bytes)
                }
            };

            if scalar != Scalar::zero() && scalar.is_canonical() {
                break scalar;
            }
        }
    }