Migrate to group::CurveAffine

Cargo.toml

@@ -4,3 +4,7 @@ members = [
     "halo2_gadgets",
     "halo2_proofs",
 ]
+
+[patch.crates-io]
+group = { git = "https://github.com/zkcrypto/group.git", rev = "696c2128529b5a9e18eed46d1da531753695db04" }
+pasta_curves = { git = "https://github.com/zcash/pasta_curves.git", rev = "fb643a4e5ea25e035af758595f903b4002b0b7a3" }

halo2_gadgets/src/ecc.rs

@@ -578,7 +578,7 @@ impl<C: CurveAffine, EccChip: EccInstructions<C>> FixedPointShort<C, EccChip> {
 #[cfg(test)]
 pub(crate) mod tests {
     use ff::PrimeField;
-    use group::{prime::PrimeCurveAffine, Curve, Group};
+    use group::{Curve, CurveAffine, Group};
 
     use halo2_proofs::{
         circuit::{Layouter, SimpleFloorPlanner, Value},

halo2_gadgets/src/ecc/chip.rs

@@ -8,7 +8,7 @@ use crate::{
 use arrayvec::ArrayVec;
 
 use ff::PrimeField;
-use group::prime::PrimeCurveAffine;
+use group::CurveAffine as _;
 use halo2_proofs::{
     circuit::{AssignedCell, Chip, Layouter, Value},
     plonk::{Advice, Assigned, Column, ConstraintSystem, Error, Fixed},

halo2_gadgets/src/ecc/chip/add.rs

@@ -325,7 +325,7 @@ impl Config {
 
 #[cfg(test)]
 pub mod tests {
-    use group::{prime::PrimeCurveAffine, Curve};
+    use group::{Curve, CurveAffine};
     use halo2_proofs::{
         circuit::{Layouter, Value},
         plonk::Error,

halo2_gadgets/src/ecc/chip/witness_point.rs

@@ -1,6 +1,6 @@
 use super::{EccPoint, NonIdentityEccPoint};
 
-use group::prime::PrimeCurveAffine;
+use group::CurveAffine as _;
 
 use halo2_proofs::{
     circuit::{AssignedCell, Region, Value},

halo2_gadgets/src/sinsemilla/chip/hash_to_point.rs

@@ -127,7 +127,7 @@ where
         {
             use crate::sinsemilla::primitives::{K, S_PERSONALIZATION};
 
-            use group::{prime::PrimeCurveAffine, Curve};
+            use group::{Curve, CurveAffine};
             use pasta_curves::arithmetic::CurveExt;
 
             let field_elems: Value<Vec<_>> = message

halo2_gadgets/src/sinsemilla/primitives/addition.rs

@@ -1,6 +1,6 @@
 use std::ops::Add;
 
-use group::{cofactor::CofactorCurveAffine, Group};
+use group::{CurveAffine, Group};
 use pasta_curves::pallas;
 use subtle::{ConstantTimeEq, CtOption};
 

halo2_proofs/src/poly/commitment.rs

@@ -8,7 +8,7 @@ use crate::arithmetic::{best_fft, best_multiexp, parallelize, CurveAffine, Curve
 use crate::helpers::CurveRead;
 
 use ff::{Field, PrimeField};
-use group::{prime::PrimeCurveAffine, Curve, Group};
+use group::{Curve, Group};
 use std::ops::{Add, AddAssign, Mul, MulAssign};
 
 mod msm;
@@ -74,7 +74,7 @@ impl<C: CurveAffine> Params<C> {
 
         // Let's evaluate all of the Lagrange basis polynomials
         // using an inverse FFT.
-        let mut alpha_inv = <<C as PrimeCurveAffine>::Curve as Group>::Scalar::ROOT_OF_UNITY_INV;
+        let mut alpha_inv = <C::Curve as Group>::Scalar::ROOT_OF_UNITY_INV;
         for _ in k..C::Scalar::S {
             alpha_inv = alpha_inv.square();
         }