Trait halo2_gadgets::utilities::cond_swap::CondSwapInstructions

source · [−]

pub trait CondSwapInstructions<F: FieldExt>: UtilitiesInstructions<F> {
    fn swap(
        &self,
        layouter: impl Layouter<F>,
        pair: (Self::Var, Value<F>),
        swap: Value<bool>
    ) -> Result<(Self::Var, Self::Var), Error>;
}

Expand description

Instructions for a conditional swap gadget.

Required Methods

fn swap(
    &self,
    layouter: impl Layouter<F>,
    pair: (Self::Var, Value<F>),
    swap: Value<bool>
) -> Result<(Self::Var, Self::Var), Error>

Given an input pair (a,b) and a swap boolean flag, returns (b,a) if swap is set, else (a,b) if swap is not set.

The second element of the pair is required to be a witnessed value, not a variable that already exists in the circuit.

Implementors

impl<F: FieldExt> CondSwapInstructions<F> for CondSwapChip<F>

impl<Hash, Commit, F> CondSwapInstructions<Fp> for MerkleChip<Hash, Commit, F>where
    Hash: HashDomains<Affine>,
    F: FixedPoints<Affine>,
    Commit: CommitDomains<Affine, F, Hash>,