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Remove C::F_len, C::G_len for F_len<C> and G_len<C>

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Relies on the ff/group API, instead of the custom Curve type.

Also removes GENERATOR_TABLE, only used by dalek, as we should provide 
our own API for that over ff/group instead. This slows down the FROST 
tests, under debug, by about 0.2-0.3s. Ed25519 and Ristretto together 
take ~2.15 seconds now.
This commit is contained in:
Luke Parker
2022-06-30 18:46:18 -04:00
parent 4eafbe2a09
commit 133c1222ad
9 changed files with 46 additions and 84 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
crypto/frost/src/sign.rs
View File

@@ -8,7 +8,7 @@ use group::{ff::{Field, PrimeField}, GroupEncoding};
use transcript::Transcript;
use crate::{
curve::{Curve, F_from_slice, G_from_slice},
curve::{Curve, G_len, F_from_slice, G_from_slice},
FrostError,
FrostParams, FrostKeys, FrostView,
algorithm::Algorithm,
@@ -84,7 +84,7 @@ fn preprocess<R: RngCore + CryptoRng, C: Curve, A: Algorithm<C>>(
C::random_nonce(params.view().secret_share(), &mut *rng),
C::random_nonce(params.view().secret_share(), &mut *rng)
];
let commitments = [C::GENERATOR_TABLE * nonces[0], C::GENERATOR_TABLE * nonces[1]];
let commitments = [C::GENERATOR * nonces[0], C::GENERATOR * nonces[1]];
let mut serialized = commitments[0].to_bytes().as_ref().to_vec();
serialized.extend(commitments[1].to_bytes().as_ref());
@@ -146,18 +146,18 @@ fn sign_with_share<C: Curve, A: Algorithm<C>>(
let commitments = commitments.remove(l).unwrap();
let mut read_commitment = |c, label| {
let commitment = &commitments[c .. (c + C::G_len())];
let commitment = &commitments[c .. (c + G_len::<C>())];
transcript.append_message(label, commitment);
G_from_slice::<C::G>(commitment).map_err(|_| FrostError::InvalidCommitment(*l))
};
#[allow(non_snake_case)]
let mut read_D_E = || Ok(
[read_commitment(0, b"commitment_D")?, read_commitment(C::G_len(), b"commitment_E")?]
[read_commitment(0, b"commitment_D")?, read_commitment(G_len::<C>(), b"commitment_E")?]
);
B.insert(*l, read_D_E()?);
addendums.insert(*l, commitments[(C::G_len() * 2) ..].to_vec());
addendums.insert(*l, commitments[(G_len::<C>() * 2) ..].to_vec());
}
// Append the message to the transcript