solana_sdk/
signature.rs

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//! Functionality for public and private keys.
#![cfg(feature = "full")]

// legacy module paths
use {
    crate::pubkey::Pubkey,
    std::borrow::{Borrow, Cow},
};
pub use {
    crate::signer::{keypair::*, null_signer::*, presigner::*, *},
    solana_signature::{ParseSignatureError, Signature, SIGNATURE_BYTES},
};

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

#[cfg(test)]
mod tests {
    use {super::*, solana_sdk::signer::keypair::Keypair};
    #[test]
    fn test_signature_fromstr() {
        let signature = Keypair::new().sign_message(&[0u8]);

        let mut signature_base58_str = bs58::encode(signature).into_string();

        assert_eq!(signature_base58_str.parse::<Signature>(), Ok(signature));

        signature_base58_str.push_str(&bs58::encode(<[u8; 64]>::from(signature)).into_string());
        assert_eq!(
            signature_base58_str.parse::<Signature>(),
            Err(ParseSignatureError::WrongSize)
        );

        signature_base58_str.truncate(signature_base58_str.len() / 2);
        assert_eq!(signature_base58_str.parse::<Signature>(), Ok(signature));

        signature_base58_str.truncate(signature_base58_str.len() / 2);
        assert_eq!(
            signature_base58_str.parse::<Signature>(),
            Err(ParseSignatureError::WrongSize)
        );

        let mut signature_base58_str = bs58::encode(<[u8; 64]>::from(signature)).into_string();
        assert_eq!(signature_base58_str.parse::<Signature>(), Ok(signature));

        // throw some non-base58 stuff in there
        signature_base58_str.replace_range(..1, "I");
        assert_eq!(
            signature_base58_str.parse::<Signature>(),
            Err(ParseSignatureError::Invalid)
        );

        // too long input string
        // longest valid encoding
        let mut too_long = bs58::encode(&[255u8; SIGNATURE_BYTES]).into_string();
        // and one to grow on
        too_long.push('1');
        assert_eq!(
            too_long.parse::<Signature>(),
            Err(ParseSignatureError::WrongSize)
        );
    }
}