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Use GroupEncoding instead of Curve's from_slice/to_bytes

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Increases usage of standardization while expanding dalek_ff_group.

Closes https://github.com/serai-dex/serai/issues/26 by moving 
dfg::EdwardsPoint to only be for the prime subgroup.
This commit is contained in:
Luke Parker
2022-06-28 01:25:26 -04:00
parent ac17645fc8
commit 3de7a76051
14 changed files with 141 additions and 178 deletions
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2
processor/Cargo.toml
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@@ -18,6 +18,8 @@ serde_json = "1.0"
curve25519-dalek = { version = "3", features = ["std"] }
blake2 = "0.10"
group = "0.12"
transcript = { package = "flexible-transcript", path = "../crypto/transcript", features = ["recommended"] }
dalek-ff-group = { path = "../crypto/dalek-ff-group" }
frost = { package = "modular-frost", path = "../crypto/frost" }

5
processor/src/wallet.rs
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@@ -2,8 +2,9 @@ use std::{sync::Arc, collections::HashMap};
use rand_core::OsRng;
use transcript::{Transcript, RecommendedTranscript};
use group::GroupEncoding;
use transcript::{Transcript, RecommendedTranscript};
use frost::{curve::Curve, FrostKeys, sign::{PreprocessMachine, SignMachine, SignatureMachine}};
use crate::{coin::{CoinError, Output, Coin}, SignError, Network};
@@ -31,7 +32,7 @@ impl<C: Curve> WalletKeys<C> {
let mut transcript = RecommendedTranscript::new(DST);
transcript.append_message(b"chain", chain);
transcript.append_message(b"curve", C::ID);
transcript.append_message(b"group_key", &C::G_to_bytes(&self.keys.group_key()));
transcript.append_message(b"group_key", self.keys.group_key().to_bytes().as_ref());
self.keys.offset(C::hash_to_F(DST, &transcript.challenge(b"offset")))
}
}