122 lines
4.7 KiB
Rust
122 lines
4.7 KiB
Rust
//! Ciphersuite-generic test functions for re-randomized FROST.
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use std::collections::HashMap;
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use crate::{frost_core::frost, frost_core::Ciphersuite, RandomizedParams};
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use frost_core::{Signature, VerifyingKey};
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use rand_core::{CryptoRng, RngCore};
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/// Test re-randomized FROST signing with trusted dealer with a Ciphersuite.
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/// Returns the signed message, generated signature, and the randomized public key
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/// so that the caller can verify the signature with their own implementation.
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pub fn check_randomized_sign_with_dealer<C: Ciphersuite, R: RngCore + CryptoRng>(
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mut rng: R,
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) -> (Vec<u8>, Signature<C>, VerifyingKey<C>) {
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////////////////////////////////////////////////////////////////////////////
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// Key generation
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////////////////////////////////////////////////////////////////////////////
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let max_signers = 5;
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let min_signers = 3;
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let (shares, pubkeys) =
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frost::keys::keygen_with_dealer(max_signers, min_signers, &mut rng).unwrap();
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// Verifies the secret shares from the dealer
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let key_packages: HashMap<frost::Identifier<C>, frost::keys::KeyPackage<C>> = shares
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.into_iter()
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.map(|share| {
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(
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share.identifier,
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frost::keys::KeyPackage::try_from(share).unwrap(),
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)
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})
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.collect();
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let mut nonces: HashMap<frost::Identifier<C>, frost::round1::SigningNonces<C>> = HashMap::new();
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let mut commitments: HashMap<frost::Identifier<C>, frost::round1::SigningCommitments<C>> =
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HashMap::new();
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let randomizer_params = RandomizedParams::new(&pubkeys, &mut rng);
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////////////////////////////////////////////////////////////////////////////
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// Round 1: generating nonces and signing commitments for each participant
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////////////////////////////////////////////////////////////////////////////
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for participant_index in 1..(min_signers as u16 + 1) {
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let participant_identifier = participant_index.try_into().expect("should be nonzero");
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// Generate one (1) nonce and one SigningCommitments instance for each
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// participant, up to _min_signers_.
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let (nonce, commitment) = frost::round1::commit(
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participant_identifier,
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key_packages
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.get(&participant_identifier)
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.unwrap()
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.secret_share(),
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&mut rng,
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);
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nonces.insert(participant_identifier, nonce);
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commitments.insert(participant_identifier, commitment);
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}
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// This is what the signature aggregator / coordinator needs to do:
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// - decide what message to sign
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// - take one (unused) commitment per signing participant
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let mut signature_shares: Vec<frost::round2::SignatureShare<_>> = Vec::new();
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let message = "message to sign".as_bytes();
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let comms = commitments.clone().into_values().collect();
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let signing_package = frost::SigningPackage::new(comms, message.to_vec());
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////////////////////////////////////////////////////////////////////////////
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// Round 2: each participant generates their signature share
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////////////////////////////////////////////////////////////////////////////
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for participant_identifier in nonces.keys() {
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let key_package = key_packages.get(participant_identifier).unwrap();
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let nonces_to_use = &nonces.get(participant_identifier).unwrap();
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// Each participant generates their signature share.
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let signature_share = crate::sign(
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&signing_package,
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nonces_to_use,
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key_package,
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randomizer_params.randomizer_point(),
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)
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.unwrap();
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signature_shares.push(signature_share);
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}
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////////////////////////////////////////////////////////////////////////////
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// Aggregation: collects the signing shares from all participants,
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// generates the final signature.
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////////////////////////////////////////////////////////////////////////////
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// Aggregate (also verifies the signature shares)
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let group_signature_res = crate::aggregate(
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&signing_package,
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&signature_shares[..],
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&pubkeys,
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&randomizer_params,
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);
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assert!(group_signature_res.is_ok());
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let group_signature = group_signature_res.unwrap();
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// Check that the threshold signature can be verified by the randomized group public
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// key (the verification key).
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assert!(randomizer_params
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.randomized_group_public_key()
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.verify(message, &group_signature)
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.is_ok());
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// Note that key_package.group_public can't be used to verify the signature
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// since those are non-randomized.
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(
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message.to_owned(),
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group_signature,
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*randomizer_params.randomized_group_public_key(),
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)
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}
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