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use crate::{Error, Result};
use crate::{PublicKey, SecretKey, Signature, SignatureShare};
use ed25519_dalek::Signer;
use rand::{CryptoRng, Rng};
use serde::{Deserialize, Serialize};
use std::fmt::{self, Debug, Formatter};
use threshold_crypto::{self, serde_impl::SerdeSecret};
#[derive(Serialize, Deserialize)]
pub enum Keypair {
Ed25519(ed25519_dalek::Keypair),
BlsShare(BlsKeypairShare),
}
impl Debug for Keypair {
fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
write!(formatter, "Keypair::")?;
match self {
Self::Ed25519(_) => write!(formatter, "Ed25519(..)"),
Self::BlsShare(_) => write!(formatter, "BlsShare(..)"),
}
}
}
impl PartialEq for Keypair {
fn eq(&self, other: &Self) -> bool {
match (self, other) {
(Self::Ed25519(keypair), Self::Ed25519(other_keypair)) => {
keypair.to_bytes().to_vec() == other_keypair.to_bytes().to_vec()
}
(Self::BlsShare(keypair), Self::BlsShare(other_keypair)) => keypair == other_keypair,
_ => false,
}
}
}
impl Eq for Keypair {}
impl Keypair {
pub fn new_ed25519<T: CryptoRng + Rng>(rng: &mut T) -> Self {
let keypair = ed25519_dalek::Keypair::generate(rng);
Self::Ed25519(keypair)
}
pub fn new_bls_share(
index: usize,
secret_share: threshold_crypto::SecretKeyShare,
public_key_set: threshold_crypto::PublicKeySet,
) -> Self {
Self::BlsShare(BlsKeypairShare {
index,
secret: SerdeSecret(secret_share.clone()),
public: secret_share.public_key_share(),
public_key_set,
})
}
pub fn public_key(&self) -> PublicKey {
match self {
Self::Ed25519(keypair) => PublicKey::Ed25519(keypair.public),
Self::BlsShare(keypair) => PublicKey::BlsShare(keypair.public),
}
}
pub fn secret_key(&self) -> Result<SecretKey> {
match self {
Self::Ed25519(keypair) => {
let bytes = keypair.secret.to_bytes();
match ed25519_dalek::SecretKey::from_bytes(&bytes) {
Ok(sk) => Ok(SecretKey::Ed25519(sk)),
Err(_) => Err(Error::FailedToParse(
"Could not deserialise Ed25519 secret key".to_string(),
)),
}
}
Self::BlsShare(keypair) => Ok(SecretKey::BlsShare(keypair.secret.clone())),
}
}
pub fn sign(&self, data: &[u8]) -> Signature {
match self {
Self::Ed25519(keypair) => Signature::Ed25519(keypair.sign(&data)),
Self::BlsShare(keypair) => Signature::BlsShare(SignatureShare {
index: keypair.index,
share: keypair.secret.sign(data),
}),
}
}
}
impl From<ed25519_dalek::SecretKey> for Keypair {
fn from(secret: ed25519_dalek::SecretKey) -> Self {
let keypair = ed25519_dalek::Keypair {
public: (&secret).into(),
secret,
};
Self::Ed25519(keypair)
}
}
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct BlsKeypairShare {
pub index: usize,
pub secret: SerdeSecret<threshold_crypto::SecretKeyShare>,
pub public: threshold_crypto::PublicKeyShare,
pub public_key_set: threshold_crypto::PublicKeySet,
}
#[cfg(test)]
mod tests {
use super::*;
use crate::utils;
fn gen_keypairs() -> Vec<Keypair> {
let mut rng = rand::thread_rng();
let bls_secret_key = threshold_crypto::SecretKeySet::random(1, &mut rng);
vec![
Keypair::new_ed25519(&mut rng),
Keypair::new_bls_share(
0,
bls_secret_key.secret_key_share(0),
bls_secret_key.public_keys(),
),
]
}
#[test]
fn serialisation_key_pair() -> Result<()> {
let keypairs = gen_keypairs();
for keypair in keypairs {
let encoded = utils::serialise(&keypair)?;
let decoded: Keypair = utils::deserialise(&encoded)?;
assert_eq!(decoded, keypair);
}
Ok(())
}
}