fn check_scalar()

in src/signature.rs [69:81]

• 12 lines of code
• 3 McCabe index (conditional complexity)

fn check_scalar(bytes: [u8; 32]) -> Result<Scalar, SignatureError> {
    // The highest 3 bits must not be set.  No other checking for the
    // remaining 2^253 - 2^252 + 27742317777372353535851937790883648493
    // potential non-reduced scalars is performed.
    //
    // This is compatible with ed25519-donna and libsodium when
    // -DED25519_COMPAT is NOT specified.
    if bytes[31] & 224 != 0 {
        return Err(InternalError::ScalarFormatError.into());
    }

    Ok(Scalar::from_bits(bytes))
}