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Reduce the number of constraints in `DeciderEthCircuit` (#88)
* Add a dedicated variant of `mat_vec_mul_sparse` for `NonNativeFieldVar` * Switch to a customized in-circuit nonnative implementation for efficiency * Comments and tests for `NonNativeUintVar` * Make `CycleFoldCircuit` a bit smaller * Faster trusted setup and proof generation by avoiding some nested LCs * Check the remaining limbs in a more safe way * Format * Disable the non-native checks in tests again * Clarify the group operation in `enforce_equal_unaligned` * Explain the rationale behind non-native mat-vec multiplication * Explain the difference with some other impls of `enforce_equal_unaligned` * Formatmain
winderica
8 months ago
committed by
GitHub
GitHub
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
11 changed files with 1359 additions and 487 deletions
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-
+1 -0folding-schemes/Cargo.toml
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+0 -306folding-schemes/src/folding/circuits/nonnative.rs
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+161 -0folding-schemes/src/folding/circuits/nonnative/affine.rs
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+2 -0folding-schemes/src/folding/circuits/nonnative/mod.rs
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+1019 -0folding-schemes/src/folding/circuits/nonnative/uint.rs
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+24 -9folding-schemes/src/folding/nova/circuits.rs
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+29 -39folding-schemes/src/folding/nova/cyclefold.rs
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+1 -1folding-schemes/src/folding/nova/decider_eth.rs
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+70 -77folding-schemes/src/folding/nova/decider_eth_circuit.rs
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+3 -5folding-schemes/src/folding/nova/mod.rs
-
+49 -50folding-schemes/src/utils/gadgets.rs
@ -1,306 +0,0 @@ |
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use ark_ec::{AffineRepr, CurveGroup};
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use ark_ff::{BigInteger, PrimeField};
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use ark_r1cs_std::{
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alloc::{AllocVar, AllocationMode},
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boolean::Boolean,
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fields::{
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fp::FpVar,
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nonnative::{
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params::{get_params, OptimizationType},
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AllocatedNonNativeFieldVar, NonNativeFieldVar,
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},
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FieldVar,
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},
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ToBitsGadget, ToConstraintFieldGadget,
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};
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use ark_relations::r1cs::{ConstraintSystemRef, Namespace, OptimizationGoal, SynthesisError};
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use ark_std::Zero;
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use core::borrow::Borrow;
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use std::marker::PhantomData;
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/// Compose a vector boolean into a `NonNativeFieldVar`
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pub fn nonnative_field_var_from_le_bits<TargetField: PrimeField, BaseField: PrimeField>(
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cs: ConstraintSystemRef<BaseField>,
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bits: &[Boolean<BaseField>],
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) -> Result<NonNativeFieldVar<TargetField, BaseField>, SynthesisError> {
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let params = get_params(
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TargetField::MODULUS_BIT_SIZE as usize,
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BaseField::MODULUS_BIT_SIZE as usize,
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match cs.optimization_goal() {
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OptimizationGoal::None => OptimizationType::Constraints,
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OptimizationGoal::Constraints => OptimizationType::Constraints,
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OptimizationGoal::Weight => OptimizationType::Weight,
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},
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);
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// push the lower limbs first
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let mut limbs = bits
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.chunks(params.bits_per_limb)
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.map(Boolean::le_bits_to_fp_var)
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.collect::<Result<Vec<_>, _>>()?;
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limbs.resize(params.num_limbs, FpVar::zero());
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limbs.reverse();
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Ok(AllocatedNonNativeFieldVar {
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cs,
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limbs,
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num_of_additions_over_normal_form: BaseField::one(),
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is_in_the_normal_form: false,
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target_phantom: PhantomData,
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}
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.into())
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}
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/// A more efficient version of `NonNativeFieldVar::to_constraint_field`
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pub fn nonnative_field_var_to_constraint_field<TargetField: PrimeField, BaseField: PrimeField>(
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f: &NonNativeFieldVar<TargetField, BaseField>,
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) -> Result<Vec<FpVar<BaseField>>, SynthesisError> {
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let bits = f.to_bits_le()?;
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let bits_per_limb = BaseField::MODULUS_BIT_SIZE as usize - 1;
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let num_limbs = (TargetField::MODULUS_BIT_SIZE as usize).div_ceil(bits_per_limb);
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let mut limbs = bits
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.chunks(bits_per_limb)
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.map(|chunk| {
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let mut limb = FpVar::<BaseField>::zero();
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let mut w = BaseField::one();
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for b in chunk.iter() {
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limb += FpVar::from(b.clone()) * w;
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w.double_in_place();
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}
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limb
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})
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.collect::<Vec<FpVar<BaseField>>>();
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limbs.resize(num_limbs, FpVar::zero());
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limbs.reverse();
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Ok(limbs)
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}
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/// The out-circuit counterpart of `nonnative_field_var_to_constraint_field`
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pub fn nonnative_field_to_field_elements<TargetField: PrimeField, BaseField: PrimeField>(
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f: &TargetField,
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) -> Vec<BaseField> {
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let bits = f.into_bigint().to_bits_le();
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let bits_per_limb = BaseField::MODULUS_BIT_SIZE as usize - 1;
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let num_limbs = (TargetField::MODULUS_BIT_SIZE as usize).div_ceil(bits_per_limb);
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let mut limbs = bits
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.chunks(bits_per_limb)
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.map(|chunk| {
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let mut limb = BaseField::zero();
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let mut w = BaseField::one();
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for &b in chunk.iter() {
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limb += BaseField::from(b) * w;
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w.double_in_place();
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}
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limb
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})
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.collect::<Vec<BaseField>>();
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limbs.resize(num_limbs, BaseField::zero());
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limbs.reverse();
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limbs
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}
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/// NonNativeAffineVar represents an elliptic curve point in Affine representation in the non-native
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/// field, over the constraint field. It is not intended to perform operations, but just to contain
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/// the affine coordinates in order to perform hash operations of the point.
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#[derive(Debug, Clone)]
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pub struct NonNativeAffineVar<C: CurveGroup>
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where
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<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
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{
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pub x: NonNativeFieldVar<C::BaseField, C::ScalarField>,
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pub y: NonNativeFieldVar<C::BaseField, C::ScalarField>,
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}
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impl<C> AllocVar<C, C::ScalarField> for NonNativeAffineVar<C>
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where
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C: CurveGroup,
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<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
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{
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fn new_variable<T: Borrow<C>>(
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cs: impl Into<Namespace<C::ScalarField>>,
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f: impl FnOnce() -> Result<T, SynthesisError>,
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mode: AllocationMode,
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) -> Result<Self, SynthesisError> {
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f().and_then(|val| {
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let cs = cs.into();
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let affine = val.borrow().into_affine();
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let zero_point = (&C::BaseField::zero(), &C::BaseField::zero());
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let xy = affine.xy().unwrap_or(zero_point);
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let x = NonNativeFieldVar::<C::BaseField, C::ScalarField>::new_variable(
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cs.clone(),
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|| Ok(xy.0),
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mode,
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)?;
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let y = NonNativeFieldVar::<C::BaseField, C::ScalarField>::new_variable(
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cs.clone(),
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|| Ok(xy.1),
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mode,
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)?;
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Ok(Self { x, y })
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})
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}
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}
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impl<C: CurveGroup> ToConstraintFieldGadget<C::ScalarField> for NonNativeAffineVar<C>
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where
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<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
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{
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// A more efficient version of `point_to_nonnative_limbs_custom_opt`.
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// Used for converting `NonNativeAffineVar` to a vector of `FpVar` with minimum length in
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// the circuit.
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fn to_constraint_field(&self) -> Result<Vec<FpVar<C::ScalarField>>, SynthesisError> {
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let x = nonnative_field_var_to_constraint_field(&self.x)?;
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let y = nonnative_field_var_to_constraint_field(&self.y)?;
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Ok([x, y].concat())
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}
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}
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/// The out-circuit counterpart of `NonNativeAffineVar::to_constraint_field`
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#[allow(clippy::type_complexity)]
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pub fn nonnative_affine_to_field_elements<C: CurveGroup>(
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p: C,
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) -> Result<(Vec<C::ScalarField>, Vec<C::ScalarField>), SynthesisError>
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where
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<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
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{
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let affine = p.into_affine();
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if affine.is_zero() {
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let x = nonnative_field_to_field_elements(&C::BaseField::zero());
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let y = nonnative_field_to_field_elements(&C::BaseField::zero());
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return Ok((x, y));
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}
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let (x, y) = affine.xy().unwrap();
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let x = nonnative_field_to_field_elements(x);
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let y = nonnative_field_to_field_elements(y);
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Ok((x, y))
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}
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impl<C: CurveGroup> NonNativeAffineVar<C>
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where
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<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
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{
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// A wrapper of `point_to_nonnative_limbs_custom_opt` with constraints-focused optimization
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// type (which is the default optimization type for arkworks' Groth16).
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// Used for extracting a list of field elements of type `C::ScalarField` from the public input
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// `p`, in exactly the same way as how `NonNativeAffineVar` is represented as limbs of type
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// `FpVar` in-circuit.
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#[allow(clippy::type_complexity)]
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pub fn inputize(p: C) -> Result<(Vec<C::ScalarField>, Vec<C::ScalarField>), SynthesisError> {
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point_to_nonnative_limbs_custom_opt(p, OptimizationType::Constraints)
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}
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}
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// Used to compute (outside the circuit) the limbs representation of a point.
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// For `OptimizationType::Constraints`, the result matches the one used in-circuit.
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// For `OptimizationType::Weight`, the result vector is more dense and is suitable for hashing.
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// It is possible to further optimize the length of the result vector (see
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// `nonnative_affine_to_field_elements`)
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#[allow(clippy::type_complexity)]
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fn point_to_nonnative_limbs_custom_opt<C: CurveGroup>(
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p: C,
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optimization_type: OptimizationType,
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) -> Result<(Vec<C::ScalarField>, Vec<C::ScalarField>), SynthesisError>
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where
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<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
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{
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let affine = p.into_affine();
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if affine.is_zero() {
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let x =
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AllocatedNonNativeFieldVar::<C::BaseField, C::ScalarField>::get_limbs_representations(
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&C::BaseField::zero(),
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optimization_type,
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)?;
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let y =
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AllocatedNonNativeFieldVar::<C::BaseField, C::ScalarField>::get_limbs_representations(
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&C::BaseField::zero(),
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optimization_type,
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)?;
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return Ok((x, y));
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}
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let (x, y) = affine.xy().unwrap();
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let x = AllocatedNonNativeFieldVar::<C::BaseField, C::ScalarField>::get_limbs_representations(
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x,
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optimization_type,
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)?;
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let y = AllocatedNonNativeFieldVar::<C::BaseField, C::ScalarField>::get_limbs_representations(
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y,
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optimization_type,
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)?;
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Ok((x, y))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use ark_pallas::{Fr, Projective};
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use ark_r1cs_std::R1CSVar;
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use ark_relations::r1cs::ConstraintSystem;
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use ark_std::UniformRand;
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#[test]
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fn test_alloc_zero() {
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let cs = ConstraintSystem::<Fr>::new_ref();
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// dealing with the 'zero' point should not panic when doing the unwrap
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let p = Projective::zero();
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assert!(NonNativeAffineVar::<Projective>::new_witness(cs.clone(), || Ok(p)).is_ok());
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}
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#[test]
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fn test_arkworks_to_constraint_field() {
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let cs = ConstraintSystem::<Fr>::new_ref();
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// check that point_to_nonnative_limbs returns the expected values
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let mut rng = ark_std::test_rng();
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let p = Projective::rand(&mut rng);
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let pVar = NonNativeAffineVar::<Projective>::new_witness(cs.clone(), || Ok(p)).unwrap();
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let (x, y) = point_to_nonnative_limbs_custom_opt(p, OptimizationType::Weight).unwrap();
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assert_eq!(pVar.x.to_constraint_field().unwrap().value().unwrap(), x);
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assert_eq!(pVar.y.to_constraint_field().unwrap().value().unwrap(), y);
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}
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|
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#[test]
|
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fn test_improved_to_constraint_field() {
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let cs = ConstraintSystem::<Fr>::new_ref();
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|
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// check that point_to_nonnative_limbs returns the expected values
|
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let mut rng = ark_std::test_rng();
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let p = Projective::rand(&mut rng);
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let pVar = NonNativeAffineVar::<Projective>::new_witness(cs.clone(), || Ok(p)).unwrap();
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let (x, y) = nonnative_affine_to_field_elements(p).unwrap();
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assert_eq!(
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pVar.to_constraint_field().unwrap().value().unwrap(),
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[x, y].concat()
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);
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}
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|
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#[test]
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fn test_inputize() {
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let cs = ConstraintSystem::<Fr>::new_ref();
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|
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// check that point_to_nonnative_limbs returns the expected values
|
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let mut rng = ark_std::test_rng();
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let p = Projective::rand(&mut rng);
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let pVar = NonNativeAffineVar::<Projective>::new_witness(cs.clone(), || Ok(p)).unwrap();
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let (x, y) = NonNativeAffineVar::inputize(p).unwrap();
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|
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match (pVar.x, pVar.y) {
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(NonNativeFieldVar::Var(p_x), NonNativeFieldVar::Var(p_y)) => {
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assert_eq!(p_x.limbs.value().unwrap(), x);
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assert_eq!(p_y.limbs.value().unwrap(), y);
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}
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_ => unreachable!(),
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}
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}
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}
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@ -0,0 +1,161 @@ |
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use ark_ec::{AffineRepr, CurveGroup};
|
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use ark_ff::PrimeField;
|
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use ark_r1cs_std::{
|
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alloc::{AllocVar, AllocationMode},
|
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fields::fp::FpVar,
|
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ToConstraintFieldGadget,
|
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};
|
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use ark_relations::r1cs::{Namespace, SynthesisError};
|
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use ark_std::Zero;
|
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use core::borrow::Borrow;
|
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|
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use super::uint::{nonnative_field_to_field_elements, NonNativeUintVar};
|
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|
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/// NonNativeAffineVar represents an elliptic curve point in Affine representation in the non-native
|
|||
/// field, over the constraint field. It is not intended to perform operations, but just to contain
|
|||
/// the affine coordinates in order to perform hash operations of the point.
|
|||
#[derive(Debug, Clone)]
|
|||
pub struct NonNativeAffineVar<C: CurveGroup>
|
|||
where
|
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<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
|
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{
|
|||
pub x: NonNativeUintVar<C::ScalarField>,
|
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pub y: NonNativeUintVar<C::ScalarField>,
|
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}
|
|||
|
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impl<C> AllocVar<C, C::ScalarField> for NonNativeAffineVar<C>
|
|||
where
|
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C: CurveGroup,
|
|||
<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
|
|||
{
|
|||
fn new_variable<T: Borrow<C>>(
|
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cs: impl Into<Namespace<C::ScalarField>>,
|
|||
f: impl FnOnce() -> Result<T, SynthesisError>,
|
|||
mode: AllocationMode,
|
|||
) -> Result<Self, SynthesisError> {
|
|||
f().and_then(|val| {
|
|||
let cs = cs.into();
|
|||
|
|||
let affine = val.borrow().into_affine();
|
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let zero_point = (&C::BaseField::zero(), &C::BaseField::zero());
|
|||
let xy = affine.xy().unwrap_or(zero_point);
|
|||
|
|||
let x = NonNativeUintVar::new_variable(cs.clone(), || Ok(*xy.0), mode)?;
|
|||
let y = NonNativeUintVar::new_variable(cs.clone(), || Ok(*xy.1), mode)?;
|
|||
|
|||
Ok(Self { x, y })
|
|||
})
|
|||
}
|
|||
}
|
|||
|
|||
impl<C: CurveGroup> ToConstraintFieldGadget<C::ScalarField> for NonNativeAffineVar<C>
|
|||
where
|
|||
<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
|
|||
{
|
|||
// Used for converting `NonNativeAffineVar` to a vector of `FpVar` with minimum length in
|
|||
// the circuit.
|
|||
fn to_constraint_field(&self) -> Result<Vec<FpVar<C::ScalarField>>, SynthesisError> {
|
|||
let x = self.x.to_constraint_field()?;
|
|||
let y = self.y.to_constraint_field()?;
|
|||
Ok([x, y].concat())
|
|||
}
|
|||
}
|
|||
|
|||
/// The out-circuit counterpart of `NonNativeAffineVar::to_constraint_field`
|
|||
#[allow(clippy::type_complexity)]
|
|||
pub fn nonnative_affine_to_field_elements<C: CurveGroup>(
|
|||
p: C,
|
|||
) -> Result<(Vec<C::ScalarField>, Vec<C::ScalarField>), SynthesisError>
|
|||
where
|
|||
<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
|
|||
{
|
|||
let affine = p.into_affine();
|
|||
if affine.is_zero() {
|
|||
let x = nonnative_field_to_field_elements(&C::BaseField::zero());
|
|||
let y = nonnative_field_to_field_elements(&C::BaseField::zero());
|
|||
return Ok((x, y));
|
|||
}
|
|||
|
|||
let (x, y) = affine.xy().unwrap();
|
|||
let x = nonnative_field_to_field_elements(x);
|
|||
let y = nonnative_field_to_field_elements(y);
|
|||
Ok((x, y))
|
|||
}
|
|||
|
|||
impl<C: CurveGroup> NonNativeAffineVar<C>
|
|||
where
|
|||
<C as ark_ec::CurveGroup>::BaseField: ark_ff::PrimeField,
|
|||
{
|
|||
// A wrapper of `point_to_nonnative_limbs_custom_opt` with constraints-focused optimization
|
|||
// type (which is the default optimization type for arkworks' Groth16).
|
|||
// Used for extracting a list of field elements of type `C::ScalarField` from the public input
|
|||
// `p`, in exactly the same way as how `NonNativeAffineVar` is represented as limbs of type
|
|||
// `FpVar` in-circuit.
|
|||
#[allow(clippy::type_complexity)]
|
|||
pub fn inputize(p: C) -> Result<(Vec<C::ScalarField>, Vec<C::ScalarField>), SynthesisError> {
|
|||
let affine = p.into_affine();
|
|||
if affine.is_zero() {
|
|||
let x = NonNativeUintVar::inputize(
|
|||
&(C::ScalarField::zero()).into(),
|
|||
C::ScalarField::MODULUS_BIT_SIZE as usize,
|
|||
);
|
|||
let y = NonNativeUintVar::inputize(
|
|||
&(C::ScalarField::zero()).into(),
|
|||
C::ScalarField::MODULUS_BIT_SIZE as usize,
|
|||
);
|
|||
return Ok((x, y));
|
|||
}
|
|||
|
|||
let (x, y) = affine.xy().unwrap();
|
|||
let x = NonNativeUintVar::inputize(&(*x).into(), C::ScalarField::MODULUS_BIT_SIZE as usize);
|
|||
let y = NonNativeUintVar::inputize(&(*y).into(), C::ScalarField::MODULUS_BIT_SIZE as usize);
|
|||
Ok((x, y))
|
|||
}
|
|||
}
|
|||
|
|||
#[cfg(test)]
|
|||
mod tests {
|
|||
use super::*;
|
|||
use ark_pallas::{Fr, Projective};
|
|||
use ark_r1cs_std::R1CSVar;
|
|||
use ark_relations::r1cs::ConstraintSystem;
|
|||
use ark_std::UniformRand;
|
|||
|
|||
#[test]
|
|||
fn test_alloc_zero() {
|
|||
let cs = ConstraintSystem::<Fr>::new_ref();
|
|||
|
|||
// dealing with the 'zero' point should not panic when doing the unwrap
|
|||
let p = Projective::zero();
|
|||
assert!(NonNativeAffineVar::<Projective>::new_witness(cs.clone(), || Ok(p)).is_ok());
|
|||
}
|
|||
|
|||
#[test]
|
|||
fn test_improved_to_constraint_field() {
|
|||
let cs = ConstraintSystem::<Fr>::new_ref();
|
|||
|
|||
// check that point_to_nonnative_limbs returns the expected values
|
|||
let mut rng = ark_std::test_rng();
|
|||
let p = Projective::rand(&mut rng);
|
|||
let pVar = NonNativeAffineVar::<Projective>::new_witness(cs.clone(), || Ok(p)).unwrap();
|
|||
let (x, y) = nonnative_affine_to_field_elements(p).unwrap();
|
|||
assert_eq!(
|
|||
pVar.to_constraint_field().unwrap().value().unwrap(),
|
|||
[x, y].concat()
|
|||
);
|
|||
}
|
|||
|
|||
#[test]
|
|||
fn test_inputize() {
|
|||
let cs = ConstraintSystem::<Fr>::new_ref();
|
|||
|
|||
// check that point_to_nonnative_limbs returns the expected values
|
|||
let mut rng = ark_std::test_rng();
|
|||
let p = Projective::rand(&mut rng);
|
|||
let pVar = NonNativeAffineVar::<Projective>::new_witness(cs.clone(), || Ok(p)).unwrap();
|
|||
let (x, y) = NonNativeAffineVar::inputize(p).unwrap();
|
|||
|
|||
assert_eq!(pVar.x.0.value().unwrap(), x);
|
|||
assert_eq!(pVar.y.0.value().unwrap(), y);
|
|||
}
|
|||
}
|
|||
@ -0,0 +1,2 @@ |
|||
pub mod affine;
|
|||
pub mod uint;
|
|||