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Support participating multiple times in the eVRF DKG

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This commit is contained in:
Luke Parker
2024-07-28 23:41:31 -04:00
parent c5cc0dc883
commit 65efbf46c7
4 changed files with 88 additions and 64 deletions
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31
crypto/dkg/src/evrf/proof.rs
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@@ -458,41 +458,20 @@ where
decomposition
}
fn transcript(
invocation: [u8; 32],
evrf_public_key: <C::EmbeddedCurve as Ciphersuite>::G,
ecdh_public_keys: &[<C::EmbeddedCurve as Ciphersuite>::G],
) -> [u8; 32] {
let mut transcript = Blake2s256::new();
transcript.update(invocation);
transcript.update(evrf_public_key.to_bytes().as_ref());
for ecdh in ecdh_public_keys {
transcript.update(ecdh.to_bytes().as_ref());
}
transcript.finalize().into()
}
/// Prove a point on an elliptic curve had its discrete logarithm generated via an eVRF.
pub(crate) fn prove(
rng: &mut (impl RngCore + CryptoRng),
generators: &Generators<C>,
evrf_private_key: &Zeroizing<<<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::F>,
invocation: [u8; 32],
transcript: [u8; 32],
coefficients: usize,
ecdh_public_keys: &[<<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::G],
evrf_private_key: &Zeroizing<<<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::F>,
) -> Result<EvrfProveResult<C>, AcError> {
let curve_spec = CurveSpec {
a: <<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::G::a(),
b: <<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::G::b(),
};
// Combine the invocation and the public key into a transcript
let transcript = Self::transcript(
invocation,
<<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::generator() * evrf_private_key.deref(),
ecdh_public_keys,
);
// A tape of the discrete logarithm, then [zero, x**i, y x**i, y, x_coord, y_coord]
let mut vector_commitment_tape = vec![];
@@ -766,10 +745,10 @@ where
rng: &mut (impl RngCore + CryptoRng),
generators: &Generators<C>,
verifier: &mut BatchVerifier<C>,
evrf_public_key: <<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::G,
invocation: [u8; 32],
transcript: [u8; 32],
coefficients: usize,
ecdh_public_keys: &[<<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::G],
evrf_public_key: <<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::G,
proof: &[u8],
) -> Result<EvrfVerifyResult<C>, ()> {
let curve_spec = CurveSpec {
@@ -777,8 +756,6 @@ where
b: <<C as EvrfCurve>::EmbeddedCurve as Ciphersuite>::G::b(),
};
let transcript = Self::transcript(invocation, evrf_public_key, ecdh_public_keys);
let mut generator_tables = Vec::with_capacity(1 + (2 * coefficients) + ecdh_public_keys.len());
{
let (x, y) =