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pub trait PublicKey {
    fn as_bytes(&self) -> &[u8];
    fn from_bytes(bytes: &[u8]) -> Self where Self: Sized;
}

pub trait SecretKey {
    fn as_bytes(&self) -> &[u8];
    fn from_bytes(bytes: &[u8]) -> Self where Self: Sized;
}

pub trait Ciphertext {
    fn as_bytes(&self) -> &[u8];
    fn from_bytes(bytes: &[u8]) -> Self where Self: Sized;
}

pub trait SharedSecret {
    fn as_bytes(&self) -> &[u8];
    fn from_bytes(bytes: &[u8]) -> Self where Self: Sized;
}