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Implement HashOf statement and op (#217)

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Ahmad Afuni 2025-05-06 19:14:53 +10:00 • committed by GitHub
parent 53ade6ea26
commit 8cc090c5e0
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6 changed files with 139 additions and 6 deletions
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16
src/backends/plonky2/circuits/common.rs
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@ -7,7 +7,10 @@ use plonky2::{
extension::Extendable,
types::{Field, PrimeField64},
},
hash::hash_types::{HashOutTarget, RichField, NUM_HASH_OUT_ELTS},
hash::{
hash_types::{HashOutTarget, RichField, NUM_HASH_OUT_ELTS},
poseidon::PoseidonHash,
},
iop::{
target::{BoolTarget, Target},
witness::{PartialWitness, WitnessWrite},
@ -320,6 +323,9 @@ pub trait CircuitBuilderPod<F: RichField + Extendable<D>, const D: usize> {
/// and `y` each consist of two `u32` limbs.
fn assert_i64_less_if(&mut self, b: BoolTarget, x: ValueTarget, y: ValueTarget);
/// Creates value target that is a hash of two given values.
fn hash_values(&mut self, x: ValueTarget, y: ValueTarget) -> ValueTarget;
// Convenience methods for accessing and connecting elements of
// (vectors of) flattenables.
fn vec_ref<T: Flattenable>(&mut self, ts: &[T], i: Target) -> T;
@ -455,6 +461,14 @@ impl CircuitBuilderPod<F, D> for CircuitBuilder<F, D> {
assert_limb_lt(self, lhs, rhs);
}
fn hash_values(&mut self, x: ValueTarget, y: ValueTarget) -> ValueTarget {
ValueTarget::from_slice(
&self
.hash_n_to_hash_no_pad::<PoseidonHash>([x.elements, y.elements].concat())
.elements,
)
}
fn vec_ref<T: Flattenable>(&mut self, ts: &[T], i: Target) -> T {
// TODO: Revisit this when we need more than 64 statements.
let vector_ref = |builder: &mut CircuitBuilder<F, D>, v: &[Target], i| {