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Add hash and blinding_factor functions

This commit is contained in:
Constance 2023-04-17 16:51:53 +02:00
parent 8cfe0ae67d
commit 54697b22ed
1 changed files with 37 additions and 2 deletions
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39
halo2_gadgets/src/sinsemilla.rs
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@ -412,6 +412,41 @@ where
}
}
#[allow(clippy::type_complexity)]
/// $\mathsf{SinsemillaCommit}$ from [§ 5.4.8.4][concretesinsemillacommit].
///
/// [concretesinsemillacommit]: https://zips.z.cash/protocol/nu5.pdf#concretesinsemillacommit
pub fn hash(
&self,
layouter: impl Layouter<C::Base>,
message: Message<C, SinsemillaChip, K, MAX_WORDS>,
) -> Result<
(
ecc::NonIdentityPoint<C, EccChip>,
Vec<SinsemillaChip::RunningSum>,
),
Error,
> {
assert_eq!(self.M.sinsemilla_chip, message.chip);
self.M.hash_to_point(layouter, message)
}
#[allow(clippy::type_complexity)]
/// $\mathsf{SinsemillaCommit}$ from [§ 5.4.8.4][concretesinsemillacommit].
///
/// [concretesinsemillacommit]: https://zips.z.cash/protocol/nu5.pdf#concretesinsemillacommit
pub fn blinding_factor(
&self,
mut layouter: impl Layouter<C::Base>,
r: ecc::ScalarFixed<C, EccChip>,
) -> Result<
ecc::Point<C, EccChip>,
Error,
> {
let (blind, _) = self.R.mul(layouter.namespace(|| "[r] R"), r)?;
Ok(blind)
}
#[allow(clippy::type_complexity)]
/// $\mathsf{SinsemillaCommit}$ from [§ 5.4.8.4][concretesinsemillacommit].
///
@ -429,8 +464,8 @@ where
Error,
> {
assert_eq!(self.M.sinsemilla_chip, message.chip);
let (blind, _) = self.R.mul(layouter.namespace(|| "[r] R"), r)?;
let (p, zs) = self.M.hash_to_point(layouter.namespace(|| "M"), message)?;
let blind = self.blinding_factor(layouter.namespace(|| "[r] R"), r)?;
let (p, zs) = self.hash(layouter.namespace(|| "M"), message)?;
let commitment = p.add(layouter.namespace(|| "M + [r] R"), &blind)?;
Ok((commitment, zs))
}