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Move Value Commitment generator points into static via lazy_static

This commit is contained in:
Deirdre Connolly 2021-04-26 16:57:10 -04:00
parent 39b8e9859f
commit aa81876e32
1 changed files with 7 additions and 4 deletions
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11
zebra-chain/src/orchard/commitment.rs
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@ -8,6 +8,7 @@ use halo2::{
arithmetic::{CurveAffine, FieldExt}, arithmetic::{CurveAffine, FieldExt},
pasta::pallas, pasta::pallas,
}; };
use lazy_static::lazy_static;
use rand_core::{CryptoRng, RngCore}; use rand_core::{CryptoRng, RngCore};
use crate::{ use crate::{
@ -314,19 +315,21 @@ impl ValueCommitment {
Self::new(rcv, value) Self::new(rcv, value)
} }
/// Generate a new _ValueCommitment_ from an existing _rcv_ on a _value_. /// Generate a new `ValueCommitment` from an existing `rcv on a `value`.
/// ///
/// ValueCommit^Orchard(v) := /// ValueCommit^Orchard(v) :=
/// ///
/// https://zips.z.cash/protocol/protocol.pdf#concretehomomorphiccommit /// https://zips.z.cash/protocol/protocol.pdf#concretehomomorphiccommit
#[allow(non_snake_case)] #[allow(non_snake_case)]
pub fn new(rcv: pallas::Scalar, value: Amount) -> Self { pub fn new(rcv: pallas::Scalar, value: Amount) -> Self {
let V = pallas_group_hash(b"z.cash:Orchard-cv", b"v"); lazy_static! {
let R = pallas_group_hash(b"z.cash:Orchard-cv", b"r"); static ref V: pallas::Point = pallas_group_hash(b"z.cash:Orchard-cv", b"v");
static ref R: pallas::Point = pallas_group_hash(b"z.cash:Orchard-cv", b"r");
}
let v = pallas::Scalar::from(value); let v = pallas::Scalar::from(value);
Self::from(V * v + R * rcv) Self::from(*V * v + *R * rcv)
} }
} }