ethsign

A library to read JSON keyfiles and sign Ethereum stuff.

Usage:

use ethsign::{Protected, KeyFile};

fn main() {
    let file = std::fs::File::open("./res/wallet.json").unwrap();
    let key: KeyFile = serde_json::from_reader(file).unwrap();
    let password: Protected = "".into();
    let secret = key.to_secret_key(&password).unwrap();
    let message = [1_u8; 32];

    // Sign the message
    let signature = secret.sign(&message).unwrap();
    println!("{:?}", signature);

    // Recover the signer
    let public = signature.recover(&message).unwrap();
    println!("{:?}", public);

    // Verify the signature
    let res = public.verify(&signature, &message).unwrap();
    println!("{}", if res { "signature correct" } else { "invalid signature" });
}

A higher-level lib ethkey facilitates managing key files and exposes ethsign:

[dependencies]
ethkey = "0.3"

use ethkey::prelude::*;

fn main() {
    let key = EthAccount::load_or_generate("/tmp/path/to/keystore", "passwd")
        .expect("should load or generate new eth key");

    println!("{:?}", key.address());

    let message = [7_u8; 32];

    // sign the message
    let signature = key.sign(&message).unwrap();

    // verify the signature
    let result = key.verify(&signature, &message).unwrap();
    println!("{}", if result {"verification ok"} else {"wrong signature"});
}