impl group partialeq, eq, enforce_eq, cond_enforce_eq

compiler/src/constraints/expression.rs

@@ -224,9 +224,9 @@ impl<
             // (ResolvedValue::FieldElement(fe_1), ResolvedValue::FieldElement(fe_2)) => {
             //     Self::field_eq(fe_1, fe_2)
             // }
-            // (ConstrainedValue::Group(ge_1), ConstrainedValue::Group(ge_2)) => {
+            (ConstrainedValue::Group(ge_1), ConstrainedValue::Group(ge_2)) => {
-            //     Ok(Self::evaluate_group_eq(ge_1, ge_2))
+                Ok(ConstrainedValue::Boolean(Boolean::Constant(ge_1.eq(&ge_2))))
-            // }
+            }
             (ConstrainedValue::Unresolved(string), val_2) => {
                 let val_1 = ConstrainedValue::from_other(string, &val_2)?;
                 self.evaluate_eq_expression(val_1, val_2)

compiler/src/constraints/statement.rs

@@ -422,6 +422,9 @@ impl<
             (ConstrainedValue::FieldElement(fe_1), ConstrainedValue::FieldElement(fe_2)) => {
                 self.enforce_field_eq(cs, fe_1, fe_2)
             }
+            (ConstrainedValue::Group(ge_1), ConstrainedValue::Group(ge_2)) => {
+                ge_1.enforce_equal(cs, &ge_2)?
+            }
             (ConstrainedValue::Array(arr_1), ConstrainedValue::Array(arr_2)) => {
                 for (left, right) in arr_1.into_iter().zip(arr_2.into_iter()) {
                     self.enforce_assert_eq_statement(cs, left, right)?;

compiler/src/errors/constraints/statement.rs

@@ -1,4 +1,5 @@
 use crate::errors::{BooleanError, ExpressionError, FieldElementError, IntegerError, ValueError};
+use snarkos_errors::gadgets::SynthesisError;
 
 #[derive(Debug, Error)]
 pub enum StatementError {
@@ -62,6 +63,9 @@ pub enum StatementError {
 
     #[error("Expected assignment of return values for expression {}", _0)]
     Unassigned(String),
+
+    #[error("{}", _0)]
+    SynthesisError(#[from] SynthesisError),
 }
 
 impl From<ExpressionError> for StatementError {

compiler/src/group/edwards_bls12.rs

@@ -3,10 +3,13 @@ use crate::GroupType;
 
 use snarkos_curves::edwards_bls12::{EdwardsAffine, EdwardsParameters, Fq};
 use snarkos_curves::templates::twisted_edwards_extended::GroupAffine;
+use snarkos_errors::gadgets::SynthesisError;
 use snarkos_gadgets::curves::edwards_bls12::EdwardsBlsGadget;
 use snarkos_models::curves::{AffineCurve, ModelParameters};
-use snarkos_models::gadgets::curves::GroupGadget;
+use snarkos_models::gadgets::curves::{FpGadget, GroupGadget};
 use snarkos_models::gadgets::r1cs::ConstraintSystem;
+use snarkos_models::gadgets::utilities::boolean::Boolean;
+use snarkos_models::gadgets::utilities::eq::{ConditionalEqGadget, EqGadget};
 use std::ops::Sub;
 use std::str::FromStr;
 
@@ -84,3 +87,82 @@ impl GroupType<<EdwardsParameters as ModelParameters>::BaseField, Fq> for Edward
         }
     }
 }
+
+impl PartialEq for EdwardsGroupType {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (EdwardsGroupType::Constant(self_value), EdwardsGroupType::Constant(other_value)) => {
+                self_value == other_value
+            }
+
+            (EdwardsGroupType::Allocated(self_value), EdwardsGroupType::Allocated(other_value)) => {
+                self_value.eq(other_value)
+            }
+
+            (
+                EdwardsGroupType::Constant(constant_value),
+                EdwardsGroupType::Allocated(allocated_value),
+            )
+            | (
+                EdwardsGroupType::Allocated(allocated_value),
+                EdwardsGroupType::Constant(constant_value),
+            ) => <EdwardsBlsGadget as GroupGadget<GroupAffine<EdwardsParameters>, Fq>>::get_value(
+                allocated_value,
+            )
+            .map(|allocated_value| allocated_value == *constant_value)
+            .unwrap_or(false),
+        }
+    }
+}
+
+impl Eq for EdwardsGroupType {}
+
+impl EqGadget<Fq> for EdwardsGroupType {}
+
+impl ConditionalEqGadget<Fq> for EdwardsGroupType {
+    #[inline]
+    fn conditional_enforce_equal<CS: ConstraintSystem<Fq>>(
+        &self,
+        mut cs: CS,
+        other: &Self,
+        condition: &Boolean,
+    ) -> Result<(), SynthesisError> {
+        match (self, other) {
+            // c - c
+            (EdwardsGroupType::Constant(self_value), EdwardsGroupType::Constant(other_value)) => {
+                if self_value == other_value {
+                    return Ok(());
+                }
+                Err(SynthesisError::AssignmentMissing)
+            }
+            // a - a
+            (EdwardsGroupType::Allocated(self_value), EdwardsGroupType::Allocated(other_value)) => {
+                return <EdwardsBlsGadget>::conditional_enforce_equal(
+                    self_value,
+                    cs,
+                    other_value,
+                    condition,
+                )
+            }
+            // c - a = a - c
+            (
+                EdwardsGroupType::Constant(constant_value),
+                EdwardsGroupType::Allocated(allocated_value),
+            )
+            | (
+                EdwardsGroupType::Allocated(allocated_value),
+                EdwardsGroupType::Constant(constant_value),
+            ) => {
+                let x = FpGadget::from(&mut cs, &constant_value.x);
+                let y = FpGadget::from(&mut cs, &constant_value.y);
+                let constant_gadget = EdwardsBlsGadget::new(x, y);
+
+                constant_gadget.conditional_enforce_equal(cs, allocated_value, condition)
+            }
+        }
+    }
+
+    fn cost() -> usize {
+        2 * <EdwardsBlsGadget as ConditionalEqGadget<Fq>>::cost() //upper bound
+    }
+}

compiler/src/group/mod.rs

@@ -1,11 +1,14 @@
 use crate::errors::GroupError;
 use snarkos_models::curves::Field;
 use snarkos_models::gadgets::r1cs::ConstraintSystem;
+use snarkos_models::gadgets::utilities::eq::{ConditionalEqGadget, EqGadget};
 use std::fmt::Debug;
 
 pub mod edwards_bls12;
 
-pub trait GroupType<NativeF: Field, F: Field>: Sized + Clone + Debug {
+pub trait GroupType<NativeF: Field, F: Field>:
+    Sized + Clone + Debug + EqGadget<F> + ConditionalEqGadget<F>
+{
     fn constant(string: String) -> Result<Self, GroupError>;
 
     fn add<CS: ConstraintSystem<F>>(&self, cs: CS, other: &Self) -> Result<Self, GroupError>;

compiler/tests/boolean/mod.rs

@@ -9,7 +9,7 @@ use snarkos_models::gadgets::utilities::boolean::Boolean;
 
 const DIRECTORY_NAME: &str = "tests/boolean/";
 
-fn output_true(program: EdwardsTestCompiler) {
+pub fn output_true(program: EdwardsTestCompiler) {
     let output = get_output(program);
     assert_eq!(
         EdwardsConstrainedValue::Return(vec![ConstrainedValue::Boolean(Boolean::Constant(true))])
@@ -18,7 +18,7 @@ fn output_true(program: EdwardsTestCompiler) {
     );
 }
 
-fn output_false(program: EdwardsTestCompiler) {
+pub fn output_false(program: EdwardsTestCompiler) {
     let output = get_output(program);
     assert_eq!(
         EdwardsConstrainedValue::Return(vec![ConstrainedValue::Boolean(Boolean::Constant(false))])

compiler/tests/group/assert_eq_false.leo

@@ -0,0 +1,6 @@
+function main() {
+  let point_1 = (7374112779530666882856915975292384652154477718021969292781165691637980424078, 3435195339177955418892975564890903138308061187980579490487898366607011481796)group;
+  let point_2 = (1005842117974384149622370061042978581211342111653966059496918451529532134799, 79389132189982034519597104273449021362784864778548730890166152019533697186)group;
+
+  assert_eq!(point_1, point_2);
+}

compiler/tests/group/assert_eq_true.leo

@@ -0,0 +1,6 @@
+function main() {
+  let point_1 = (7374112779530666882856915975292384652154477718021969292781165691637980424078, 3435195339177955418892975564890903138308061187980579490487898366607011481796)group;
+  let point_2 = (7374112779530666882856915975292384652154477718021969292781165691637980424078, 3435195339177955418892975564890903138308061187980579490487898366607011481796)group;
+
+  assert_eq!(point_1, point_2);
+}

compiler/tests/group/eq_false.leo

@@ -0,0 +1,6 @@
+function main() -> bool {
+  let point_1 = (7374112779530666882856915975292384652154477718021969292781165691637980424078, 3435195339177955418892975564890903138308061187980579490487898366607011481796)group;
+  let point_2 = (1005842117974384149622370061042978581211342111653966059496918451529532134799, 79389132189982034519597104273449021362784864778548730890166152019533697186)group;
+
+  return point_1 == point_2
+}

compiler/tests/group/eq_true.leo

@@ -0,0 +1,6 @@
+function main() -> bool {
+  let point_1 = (7374112779530666882856915975292384652154477718021969292781165691637980424078, 3435195339177955418892975564890903138308061187980579490487898366607011481796)group;
+  let point_2 = (7374112779530666882856915975292384652154477718021969292781165691637980424078, 3435195339177955418892975564890903138308061187980579490487898366607011481796)group;
+
+  return point_1 == point_2
+}

compiler/tests/group/mod.rs

@@ -1,10 +1,12 @@
-use crate::{compile_program, get_output, EdwardsConstrainedValue, EdwardsTestCompiler};
+use crate::{compile_program, get_error, get_output, EdwardsConstrainedValue, EdwardsTestCompiler};
 use leo_compiler::group::edwards_bls12::EdwardsGroupType;
 use leo_compiler::ConstrainedValue;
 
 use snarkos_curves::edwards_bls12::EdwardsAffine;
 use snarkos_models::curves::Group;
 
+use crate::boolean::{output_false, output_true};
+use leo_compiler::errors::{CompilerError, FunctionError, StatementError};
 use std::str::FromStr;
 
 const DIRECTORY_NAME: &str = "tests/group/";
@@ -27,6 +29,15 @@ fn output_zero(program: EdwardsTestCompiler) {
     output_expected(program, EdwardsAffine::zero())
 }
 
+fn fail_enforce(program: EdwardsTestCompiler) {
+    match get_error(program) {
+        CompilerError::FunctionError(FunctionError::StatementError(
+            StatementError::SynthesisError(_),
+        )) => {}
+        error => panic!("Expected evaluate error, got {}", error),
+    }
+}
+
 #[test]
 fn test_zero() {
     let program = compile_program(DIRECTORY_NAME, "zero.leo").unwrap();
@@ -65,3 +76,27 @@ fn test_sub() {
     let program = compile_program(DIRECTORY_NAME, "sub.leo").unwrap();
     output_expected(program, sum);
 }
+
+#[test]
+fn test_eq_true() {
+    let program = compile_program(DIRECTORY_NAME, "eq_true.leo").unwrap();
+    output_true(program)
+}
+
+#[test]
+fn test_eq_false() {
+    let program = compile_program(DIRECTORY_NAME, "eq_false.leo").unwrap();
+    output_false(program)
+}
+
+#[test]
+fn test_assert_eq_true() {
+    let program = compile_program(DIRECTORY_NAME, "assert_eq_true.leo").unwrap();
+    let _res = get_output(program);
+}
+
+#[test]
+fn test_assert_eq_false() {
+    let program = compile_program(DIRECTORY_NAME, "assert_eq_false.leo").unwrap();
+    fail_enforce(program);
+}