Add ToConstraintFieldGadget for ProjectiveVar (#13)

src/bits/uint.rs

@@ -103,17 +103,17 @@ macro_rules! make_uint {
                     for b in bits.iter().rev() {
                         value.as_mut().map(|v| *v <<= 1);
 
-                        match b {
-                            &Boolean::Constant(b) => {
+                        match *b {
+                            Boolean::Constant(b) => {
                                 value.as_mut().map(|v| *v |= $native::from(b));
                             }
-                            &Boolean::Is(ref b) => match b.value() {
+                            Boolean::Is(ref b) => match b.value() {
                                 Ok(b) => {
                                     value.as_mut().map(|v| *v |= $native::from(b));
                                 }
                                 Err(_) => value = None,
                             },
-                            &Boolean::Not(ref b) => match b.value() {
+                            Boolean::Not(ref b) => match b.value() {
                                 Ok(b) => {
                                     value.as_mut().map(|v| *v |= $native::from(!b));
                                 }

src/fields/cubic_extension.rs

@@ -276,7 +276,7 @@ where
             self.cs(),
             || {
                 self.value()
-                    .map(|f| f.inverse().unwrap_or(CubicExtField::zero()))
+                    .map(|f| f.inverse().unwrap_or_else(CubicExtField::zero))
             },
             mode,
         )?;

src/fields/fp/cmp.rs

@@ -86,7 +86,7 @@ impl FpVar {
         let (left, right) = match ordering {
             Ordering::Less => (self, other),
             Ordering::Greater => (other, self),
-            Ordering::Equal => Err(SynthesisError::Unsatisfiable)?,
+            Ordering::Equal => return Err(SynthesisError::Unsatisfiable),
         };
         let right_for_check = if should_also_check_equality {
             right + F::one()

src/fields/fp/mod.rs

@@ -224,7 +224,9 @@ impl AllocatedFp {
     /// This does not create any constraints.
     #[tracing::instrument(target = "r1cs")]
     pub fn negate_in_place(&mut self) -> &mut Self {
-        self.value.as_mut().map(|val| *val = -(*val));
+        if let Some(val) = self.value.as_mut() {
+            *val = -(*val);
+        }
         self.variable = self.cs.new_lc(lc!() - self.variable).unwrap();
         self
     }
@@ -243,7 +245,7 @@ impl AllocatedFp {
     #[tracing::instrument(target = "r1cs")]
     pub fn inverse(&self) -> Result<Self, SynthesisError> {
         let inverse = Self::new_witness(self.cs.clone(), || {
-            Ok(self.value.get()?.inverse().unwrap_or(F::zero()))
+            Ok(self.value.get()?.inverse().unwrap_or_else(F::zero))
         })?;
 
         self.cs.enforce_constraint(
@@ -595,7 +597,7 @@ impl ThreeBitCondNegLookupGadget for AllocatedFp {
         b.cs().enforce_constraint(
             y_lc.clone() + y_lc.clone(),
             b[2].lc(),
-            y_lc.clone() - result.variable,
+            y_lc - result.variable,
         )?;
 
         Ok(result)
@@ -625,7 +627,7 @@ impl AllocVar for AllocatedFp {
             } else {
                 cs.new_witness_variable(value_generator)?
             };
-            Ok(Self::new(value, variable, cs.clone()))
+            Ok(Self::new(value, variable, cs))
         }
     }
 }
@@ -679,7 +681,7 @@ impl FieldVar for FpVar {
             (Var(v1), Var(v2), Var(v3)) => v1.mul_equals(v2, v3),
             (Var(v1), Var(v2), Constant(f)) => {
                 let cs = v1.cs.clone();
-                let v3 = AllocatedFp::new_constant(cs.clone(), f).unwrap();
+                let v3 = AllocatedFp::new_constant(cs, f).unwrap();
                 v1.mul_equals(v2, &v3)
             }
         }
@@ -937,7 +939,7 @@ impl CondSelectGadget for FpVar {
                             Self::Var(v) => v.clone(),
                         };
                         let false_value = match false_value {
-                            Self::Constant(f) => AllocatedFp::new_constant(cs.clone(), f)?,
+                            Self::Constant(f) => AllocatedFp::new_constant(cs, f)?,
                             Self::Var(v) => v.clone(),
                         };
                         cond.select(&true_value, &false_value).map(Self::Var)

src/fields/quadratic_extension.rs

@@ -284,7 +284,7 @@ where
             self.cs(),
             || {
                 self.value()
-                    .map(|f| f.inverse().unwrap_or(QuadExtField::zero()))
+                    .map(|f| f.inverse().unwrap_or_else(QuadExtField::zero))
             },
             mode,
         )?;

src/groups/curves/short_weierstrass/mnt4/mod.rs

@@ -94,8 +94,8 @@ impl G1PreparedVar
         let x_twist = Fp2Var::new(&q.x * P::TWIST.c0, &q.x * P::TWIST.c1);
         let y_twist = Fp2Var::new(&q.y * P::TWIST.c0, &q.y * P::TWIST.c1);
         Ok(G1PreparedVar {
-            x: q.x.clone(),
-            y: q.y.clone(),
+            x: q.x,
+            y: q.y,
             x_twist,
             y_twist,
         })

src/groups/curves/short_weierstrass/mnt6/mod.rs

@@ -58,10 +58,10 @@ impl G1PreparedVar
         let q = q.to_affine()?;
         let zero = FpVar::<P::Fp>::zero();
         let x_twist = Fp3Var::new(q.x.clone(), zero.clone(), zero.clone()) * P::TWIST;
-        let y_twist = Fp3Var::new(q.y.clone(), zero.clone(), zero.clone()) * P::TWIST;
+        let y_twist = Fp3Var::new(q.y.clone(), zero.clone(), zero) * P::TWIST;
         let result = G1PreparedVar {
-            x: q.x.clone(),
-            y: q.y.clone(),
+            x: q.x,
+            y: q.y,
             x_twist,
             y_twist,
         };

src/groups/curves/short_weierstrass/mod.rs

@@ -103,6 +103,7 @@ where
 
         res.extend_from_slice(&self.x.to_constraint_field()?);
         res.extend_from_slice(&self.y.to_constraint_field()?);
+        res.extend_from_slice(&self.infinity.to_constraint_field()?);
 
         Ok(res)
     }
@@ -163,7 +164,7 @@ where
             // Allocate a variable whose value is either `self.z.inverse()` if the inverse exists,
             // and is zero otherwise.
             let z_inv = F::new_witness(ark_relations::ns!(cs, "z_inverse"), || {
-                Ok(self.z.value()?.inverse().unwrap_or(P::BaseField::zero()))
+                Ok(self.z.value()?.inverse().unwrap_or_else(P::BaseField::zero))
             })?;
             // The inverse exists if `!self.is_zero()`.
             // This means that `z_inv * self.z = 1` if `self.is_not_zero()`, and
@@ -347,6 +348,20 @@ where
     }
 }
 
+impl<P, F> ToConstraintFieldGadget<<P::BaseField as Field>::BasePrimeField> for ProjectiveVar<P, F>
+where
+    P: SWModelParameters,
+    F: FieldVar<P::BaseField, <P::BaseField as Field>::BasePrimeField>,
+    for<'a> &'a F: FieldOpsBounds<'a, P::BaseField, F>,
+    F: ToConstraintFieldGadget<<P::BaseField as Field>::BasePrimeField>,
+{
+    fn to_constraint_field(
+        &self,
+    ) -> Result<Vec<FpVar<<P::BaseField as Field>::BasePrimeField>>, SynthesisError> {
+        self.to_affine()?.to_constraint_field()
+    }
+}
+
 fn mul_by_coeff_a<
     P: SWModelParameters,
     F: FieldVar<P::BaseField, <P::BaseField as Field>::BasePrimeField>,

src/groups/curves/twisted_edwards/mod.rs

@@ -518,7 +518,7 @@ where
         B: Borrow<Boolean<<P::BaseField as Field>::BasePrimeField>>,
     {
         let scalar_bits_with_base_powers = scalar_bits_with_base_powers
-            .map(|(bit, base)| (bit.borrow().clone(), (*base).into()))
+            .map(|(bit, base)| (bit.borrow().clone(), *base))
             .collect::<Vec<(_, TEProjective<P>)>>();
         let zero = TEProjective::zero();
         for bits_base_powers in scalar_bits_with_base_powers.chunks(2) {

src/lib.rs

@@ -8,6 +8,7 @@
     nonstandard_style,
     rust_2018_idioms
 )]
+#![allow(clippy::op_ref)]
 
 #[macro_use]
 extern crate ark_std;

src/macros.rs

@@ -50,7 +50,7 @@ macro_rules! impl_bounded_ops {
             type Output = $type;
 
             #[tracing::instrument(target = "r1cs", skip(self))]
-            #[allow(unused_braces)]
+            #[allow(unused_braces, clippy::redundant_closure_call)]
             fn $fn(self, other: Self) -> Self::Output {
                 ($impl)(self, other)
             }
@@ -130,7 +130,7 @@ macro_rules! impl_bounded_ops {
             type Output = $type;
 
             #[tracing::instrument(target = "r1cs", skip(self))]
-            #[allow(unused_braces)]
+            #[allow(unused_braces, clippy::redundant_closure_call)]
             fn $fn(self, other: $native) -> Self::Output {
                 ($constant_impl)(self, other)
             }

src/pairing/bls12/mod.rs

@@ -31,8 +31,8 @@ impl PairingVar
                 let mut c1 = coeffs.1.clone();
                 let c2 = Fp2V::<P>::new(p.y.clone(), zero);
 
-                c1.c0 = c1.c0 * &p.x;
-                c1.c1 = c1.c1 * &p.x;
+                c1.c0 *= &p.x;
+                c1.c1 *= &p.x;
                 *f = f.mul_by_014(&c0, &c1, &c2)?;
                 Ok(())
             }
@@ -41,8 +41,8 @@ impl PairingVar
                 let mut c1 = coeffs.0.clone();
                 let c2 = coeffs.1.clone();
 
-                c1.c0 = c1.c0 * &p.x;
-                c1.c1 = c1.c1 * &p.x;
+                c1.c0 *= &p.x;
+                c1.c1 *= &p.x;
                 *f = f.mul_by_034(&c0, &c1, &c2)?;
                 Ok(())
             }

src/pairing/mnt4/mod.rs

@@ -101,14 +101,15 @@ impl PairingVar
 
         let mut f = Fp4G::<P>::one();
 
-        let mut dbl_idx: usize = 0;
         let mut add_idx: usize = 0;
 
         // code below gets executed for all bits (EXCEPT the MSB itself) of
         // mnt6_param_p (skipping leading zeros) in MSB to LSB order
-        for bit in BitIteratorBE::without_leading_zeros(P::ATE_LOOP_COUNT).skip(1) {
+        for (dbl_idx, bit) in BitIteratorBE::without_leading_zeros(P::ATE_LOOP_COUNT)
+            .skip(1)
+            .enumerate()
+        {
             let dc = &q.double_coefficients[dbl_idx];
-            dbl_idx += 1;
 
             let g_rr_at_p = Fp4G::<P>::new(
                 &dc.c_l - &dc.c_4c - &dc.c_j * &p.x_twist,

src/pairing/mnt6/mod.rs

@@ -96,14 +96,15 @@ impl PairingVar
 
         let mut f = Fp6G::<P>::one();
 
-        let mut dbl_idx: usize = 0;
         let mut add_idx: usize = 0;
 
         // code below gets executed for all bits (EXCEPT the MSB itself) of
         // mnt6_param_p (skipping leading zeros) in MSB to LSB order
-        for bit in BitIteratorBE::without_leading_zeros(P::ATE_LOOP_COUNT).skip(1) {
+        for (dbl_idx, bit) in BitIteratorBE::without_leading_zeros(P::ATE_LOOP_COUNT)
+            .skip(1)
+            .enumerate()
+        {
             let dc = &q.double_coefficients[dbl_idx];
-            dbl_idx += 1;
 
             let g_rr_at_p = Fp6Var::new(
                 &dc.c_l - &dc.c_4c - &dc.c_j * &p.x_twist,