118 lines
3.0 KiB
Rust
118 lines
3.0 KiB
Rust
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use super::{fake_signature::FakeSignature, AggregatePublicKey};
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use serde::de::{Deserialize, Deserializer};
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use serde::ser::{Serialize, Serializer};
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use serde_hex::{encode as hex_encode, PrefixedHexVisitor};
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use ssz::{
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decode_ssz_list, hash, ssz_encode, Decodable, DecodeError, Encodable, SszStream, TreeHash,
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};
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const SIGNATURE_LENGTH: usize = 48;
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/// A BLS aggregate signature.
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///
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/// This struct is a wrapper upon a base type and provides helper functions (e.g., SSZ
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/// serialization).
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#[derive(Debug, PartialEq, Clone, Default, Eq)]
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pub struct FakeAggregateSignature {
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bytes: Vec<u8>,
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}
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impl FakeAggregateSignature {
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/// Creates a new all-zero's signature
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pub fn new() -> Self {
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Self::zero()
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}
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/// Creates a new all-zero's signature
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pub fn zero() -> Self {
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Self {
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bytes: vec![0; SIGNATURE_LENGTH],
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}
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}
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/// Does glorious nothing.
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pub fn add(&mut self, _signature: &FakeSignature) {
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// Do nothing.
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}
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/// _Always_ returns `true`.
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pub fn verify(
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&self,
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_msg: &[u8],
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_domain: u64,
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_aggregate_public_key: &AggregatePublicKey,
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) -> bool {
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true
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}
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/// _Always_ returns `true`.
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pub fn verify_multiple(
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&self,
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_messages: &[&[u8]],
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_domain: u64,
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_aggregate_public_keys: &[&AggregatePublicKey],
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) -> bool {
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true
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}
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}
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impl Encodable for FakeAggregateSignature {
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fn ssz_append(&self, s: &mut SszStream) {
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s.append_vec(&self.bytes);
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}
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}
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impl Decodable for FakeAggregateSignature {
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fn ssz_decode(bytes: &[u8], i: usize) -> Result<(Self, usize), DecodeError> {
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let (sig_bytes, i) = decode_ssz_list(bytes, i)?;
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Ok((FakeAggregateSignature { bytes: sig_bytes }, i))
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}
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}
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impl Serialize for FakeAggregateSignature {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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serializer.serialize_str(&hex_encode(ssz_encode(self)))
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}
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}
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impl<'de> Deserialize<'de> for FakeAggregateSignature {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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let bytes = deserializer.deserialize_str(PrefixedHexVisitor)?;
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let (obj, _) = <_>::ssz_decode(&bytes[..], 0)
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.map_err(|e| serde::de::Error::custom(format!("invalid ssz ({:?})", e)))?;
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Ok(obj)
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}
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}
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impl TreeHash for FakeAggregateSignature {
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fn hash_tree_root(&self) -> Vec<u8> {
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hash(&self.bytes)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::super::{Keypair, Signature};
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use super::*;
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use ssz::ssz_encode;
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#[test]
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pub fn test_ssz_round_trip() {
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let keypair = Keypair::random();
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let mut original = FakeAggregateSignature::new();
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original.add(&Signature::new(&[42, 42], 0, &keypair.sk));
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let bytes = ssz_encode(&original);
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let (decoded, _) = FakeAggregateSignature::ssz_decode(&bytes, 0).unwrap();
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assert_eq!(original, decoded);
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}
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}
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