2018-12-18 06:04:54 +00:00
|
|
|
use super::{AggregatePublicKey, Signature};
|
|
|
|
use bls_aggregates::AggregateSignature as RawAggregateSignature;
|
2019-01-25 02:52:21 +00:00
|
|
|
use ssz::{decode_ssz_list, Decodable, DecodeError, Encodable, SszStream};
|
2018-12-18 06:04:54 +00:00
|
|
|
|
|
|
|
/// A BLS aggregate signature.
|
|
|
|
///
|
|
|
|
/// This struct is a wrapper upon a base type and provides helper functions (e.g., SSZ
|
|
|
|
/// serialization).
|
2019-01-16 09:34:24 +00:00
|
|
|
#[derive(Debug, PartialEq, Clone, Default, Eq)]
|
2018-12-18 06:04:54 +00:00
|
|
|
pub struct AggregateSignature(RawAggregateSignature);
|
|
|
|
|
|
|
|
impl AggregateSignature {
|
|
|
|
/// Instantiate a new AggregateSignature.
|
|
|
|
pub fn new() -> Self {
|
|
|
|
AggregateSignature(RawAggregateSignature::new())
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Add (aggregate) a signature to the `AggregateSignature`.
|
|
|
|
pub fn add(&mut self, signature: &Signature) {
|
|
|
|
self.0.add(signature.as_raw())
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Verify the `AggregateSignature` against an `AggregatePublicKey`.
|
|
|
|
///
|
|
|
|
/// Only returns `true` if the set of keys in the `AggregatePublicKey` match the set of keys
|
|
|
|
/// that signed the `AggregateSignature`.
|
2018-12-25 21:54:26 +00:00
|
|
|
pub fn verify(&self, msg: &[u8], aggregate_public_key: &AggregatePublicKey) -> bool {
|
|
|
|
self.0.verify(msg, aggregate_public_key)
|
2018-12-18 06:04:54 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Encodable for AggregateSignature {
|
|
|
|
fn ssz_append(&self, s: &mut SszStream) {
|
|
|
|
s.append_vec(&self.0.as_bytes());
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Decodable for AggregateSignature {
|
|
|
|
fn ssz_decode(bytes: &[u8], i: usize) -> Result<(Self, usize), DecodeError> {
|
|
|
|
let (sig_bytes, i) = decode_ssz_list(bytes, i)?;
|
|
|
|
let raw_sig =
|
|
|
|
RawAggregateSignature::from_bytes(&sig_bytes).map_err(|_| DecodeError::TooShort)?;
|
|
|
|
Ok((AggregateSignature(raw_sig), i))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
mod tests {
|
|
|
|
use super::super::{Keypair, Signature};
|
|
|
|
use super::*;
|
2019-01-25 05:46:16 +00:00
|
|
|
use ssz::ssz_encode;
|
2018-12-18 06:04:54 +00:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
pub fn test_ssz_round_trip() {
|
|
|
|
let keypair = Keypair::random();
|
|
|
|
|
|
|
|
let mut original = AggregateSignature::new();
|
|
|
|
original.add(&Signature::new(&[42, 42], &keypair.sk));
|
|
|
|
|
|
|
|
let bytes = ssz_encode(&original);
|
|
|
|
let (decoded, _) = AggregateSignature::ssz_decode(&bytes, 0).unwrap();
|
|
|
|
|
|
|
|
assert_eq!(original, decoded);
|
|
|
|
}
|
|
|
|
}
|