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#[cfg(feature = "x16")] pub const KEY_LENGTH: usize = 16;
#[cfg(feature = "x32")] pub const KEY_LENGTH: usize = 32;

pub const BLOCK_LENGTH: usize = 16;


pub trait BlockCipher {
    const KEY_LENGTH: usize;
    const BLOCK_LENGTH: usize;

    fn new(key: &[u8; KEY_LENGTH]) -> Self;
    fn encrypt(&self, block: &mut [u8; BLOCK_LENGTH]);
    fn decrypt(&self, block: &mut [u8; BLOCK_LENGTH]);
}