solana-keypair 3.1.2

Concrete implementation of a Solana `Signer`.
Documentation 
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use {
    crate::Keypair,
    solana_address::Address,
    solana_signature::Signature,
    solana_signer::Signer,
    std::borrow::{Borrow, Cow},
};

pub trait Signable {
    fn sign(&mut self, keypair: &Keypair) {
        let signature = keypair.sign_message(self.signable_data().borrow());
        self.set_signature(signature);
    }
    fn verify(&self) -> bool {
        self.get_signature()
            .verify(self.pubkey().as_ref(), self.signable_data().borrow())
    }

    fn pubkey(&self) -> Address;
    fn signable_data(&self) -> Cow<'_, [u8]>;
    fn get_signature(&self) -> Signature;
    fn set_signature(&mut self, signature: Signature);
}