WARNING: This library is a work in progress and has not been audited. Do NOT consider the cryptography safe!
Uses the The Apache Milagro Cryptographic Library.
This crate is heavily based upon work by @lovesh.
Presently this library only supports features required for Ethereum 2.0 signature validation. The aggregation methods here are vulnerable to the rouge-key attack.
There has been no public audit or scrutiny placed upon this crate. If you're a cryptographer I would love to have your input.
This library uses a Proof of Possession (PoP) variant as protection against rogue key attacks.
A public key can be PoP verified by signing a hash of the public key. This must be done
before a PublicKey may be used in any aggregate signatures.
Subgroup checks are performed for signatures during verification and public keys during deserialisation.
Current implementation of the BLS Standard aligns with bls-signatures-v04 and hash-to-curve-v09.
Perform signing and verification of non-aggregate BLS signatures. Supports serializing and de-serializing both public and secret keys.
let sk_bytes = vec![
78, 252, 122, 126, 32, 0, 75, 89, 252, 31, 42, 130, 254, 88, 6, 90, 138, 202, 135, 194,
233, 117, 181, 75, 96, 238, 79, 100, 237, 59, 140, 111,
];
// Load some keys from a serialized secret key.
let sk = SecretKey::from_bytes(&sk_bytes).unwrap();
let pk = PublicKey::from_secret_key(&sk);
// Sign a message
let message = "cats".as_bytes();
let signature = Signature::new(&message, &sk);
assert!(signature.verify(&message, &pk));
// Serialize then de-serialize, just 'cause we can.
let pk_bytes = pk.as_bytes();
let pk = PublicKey::from_bytes(&pk_bytes).unwrap();
// Verify the message
assert!(signature.verify(&message, &pk));Generate new "random" secret keys (see SecretKey docs for information on
entropy sources).
// Generate a random key pair.
let sk = SecretKey::random(&mut rand::thread_rng());
let pk = PublicKey::from_secret_key(&sk);
// Sign and verify a message.
let message = "cats".as_bytes();
let signature = Signature::new(&message, &sk);
assert!(signature.verify(&message, &pk));Aggregate signatures and public keys. Supports serializing and de-serializing
both AggregateSignatures and AggregatePublicKeys.
let signing_secret_key_bytes = vec![
vec![
98, 161, 50, 32, 254, 87, 16, 25, 167, 79, 192, 116, 176, 74, 164, 217, 40, 57,
179, 15, 19, 21, 240, 100, 70, 127, 111, 170, 129, 137, 42, 53,
],
vec![
53, 72, 211, 104, 184, 68, 142, 208, 115, 22, 156, 97, 28, 216, 228, 102, 4, 218,
116, 226, 166, 131, 67, 7, 40, 55, 157, 167, 157, 127, 143, 13,
],
];
// Load the key pairs from our serialized secret keys,
let signing_keypairs: Vec<Keypair> = signing_secret_key_bytes
.iter()
.map(|bytes| {
let sk = SecretKey::from_bytes(&bytes).unwrap();
let pk = PublicKey::from_secret_key(&sk);
Keypair { sk, pk }
})
.collect();
let message = "cats".as_bytes();
// Create an aggregate signature over some message, also generating an
// aggregate public key at the same time.
let mut agg_sig = AggregateSignature::new();
let mut public_keys = vec![];
for keypair in &signing_keypairs {
let sig = Signature::new(&message, &keypair.sk);
agg_sig.add(&sig);
public_keys.push(keypair.pk.clone());
}
let agg_pub_key = AggregatePublicKey::into_aggregate(&public_keys).unwrap();
// Serialize and de-serialize the aggregates, just 'cause we can.
let agg_sig_bytes = agg_sig.as_bytes();
let agg_sig = AggregateSignature::from_bytes(&agg_sig_bytes).unwrap();
// Verify the AggregateSignature against the AggregatePublicKey
assert!(agg_sig.fast_aggregate_verify_pre_aggregated(&message, &agg_pub_key));
}cargo bench --features "bench"