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use crate::{
crh::{BoweHopwoodPedersenCRH, BoweHopwoodPedersenCRHParameters, PedersenCRH, PedersenCRHParameters},
errors::CRHError,
traits::CRH,
};
use snarkvm_curves::{AffineCurve, Group, ProjectiveCurve};
use snarkvm_fields::{ConstraintFieldError, Field, ToConstraintField};
use rand::Rng;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct BoweHopwoodPedersenCompressedCRH<
G: Group + ProjectiveCurve,
const NUM_WINDOWS: usize,
const WINDOW_SIZE: usize,
> {
pub parameters: PedersenCRHParameters<G, NUM_WINDOWS, WINDOW_SIZE>,
pub bowe_hopwood_parameters: BoweHopwoodPedersenCRHParameters<G>,
}
impl<G: Group + ProjectiveCurve, const NUM_WINDOWS: usize, const WINDOW_SIZE: usize> CRH
for BoweHopwoodPedersenCompressedCRH<G, NUM_WINDOWS, WINDOW_SIZE>
{
type Output = <G::Affine as AffineCurve>::BaseField;
type Parameters = PedersenCRHParameters<G, NUM_WINDOWS, WINDOW_SIZE>;
const INPUT_SIZE_BITS: usize = PedersenCRH::<G, NUM_WINDOWS, WINDOW_SIZE>::INPUT_SIZE_BITS;
fn setup<R: Rng>(rng: &mut R) -> Self {
let BoweHopwoodPedersenCRH {
parameters,
bowe_hopwood_parameters,
} = BoweHopwoodPedersenCRH::<G, NUM_WINDOWS, WINDOW_SIZE>::setup(rng);
Self {
parameters,
bowe_hopwood_parameters,
}
}
fn hash(&self, input: &[u8]) -> Result<Self::Output, CRHError> {
let crh = BoweHopwoodPedersenCRH::<G, NUM_WINDOWS, WINDOW_SIZE> {
parameters: self.parameters.clone(),
bowe_hopwood_parameters: self.bowe_hopwood_parameters.clone(),
};
let output = crh.hash(input)?;
let affine = output.into_affine();
debug_assert!(affine.is_in_correct_subgroup_assuming_on_curve());
Ok(affine.to_x_coordinate())
}
fn parameters(&self) -> &Self::Parameters {
&self.parameters
}
}
impl<G: Group + ProjectiveCurve, const NUM_WINDOWS: usize, const WINDOW_SIZE: usize>
From<PedersenCRHParameters<G, NUM_WINDOWS, WINDOW_SIZE>>
for BoweHopwoodPedersenCompressedCRH<G, NUM_WINDOWS, WINDOW_SIZE>
{
fn from(parameters: PedersenCRHParameters<G, NUM_WINDOWS, WINDOW_SIZE>) -> Self {
Self {
bowe_hopwood_parameters: BoweHopwoodPedersenCRHParameters::new(),
parameters,
}
}
}
impl<F: Field, G: Group + ProjectiveCurve + ToConstraintField<F>, const NUM_WINDOWS: usize, const WINDOW_SIZE: usize>
ToConstraintField<F> for BoweHopwoodPedersenCompressedCRH<G, NUM_WINDOWS, WINDOW_SIZE>
{
#[inline]
fn to_field_elements(&self) -> Result<Vec<F>, ConstraintFieldError> {
self.parameters.to_field_elements()
}
}