fn from()

in src/secret.rs [265:282]

• 14 lines of code
• 1 McCabe index (conditional complexity)

    fn from(secret_key: &'a SecretKey) -> ExpandedSecretKey {
        let mut h: Sha512 = Sha512::default();
        let mut hash:  [u8; 64] = [0u8; 64];
        let mut lower: [u8; 32] = [0u8; 32];
        let mut upper: [u8; 32] = [0u8; 32];

        h.update(secret_key.as_bytes());
        hash.copy_from_slice(h.finalize().as_slice());

        lower.copy_from_slice(&hash[00..32]);
        upper.copy_from_slice(&hash[32..64]);

        lower[0]  &= 248;
        lower[31] &=  63;
        lower[31] |=  64;

        ExpandedSecretKey{ key: Scalar::from_bits(lower), nonce: upper, }
    }