Add constraints for relevant curves (#3)

mnt6_753/src/constraints/fields.rs

@@ -0,0 +1,26 @@
+use crate::{Fq, Fq3Parameters, Fq6Parameters};
+
+use ark_r1cs_std::fields::{fp::FpVar, fp3::Fp3Var, fp6_2over3::Fp6Var};
+
+/// A variable that is the R1CS equivalent of `crate::Fq`.
+pub type FqVar = FpVar<Fq>;
+/// A variable that is the R1CS equivalent of `crate::Fq3`.
+pub type Fq3Var = Fp3Var<Fq3Parameters>;
+/// A variable that is the R1CS equivalent of `crate::Fq6`.
+pub type Fq6Var = Fp6Var<Fq6Parameters>;
+
+#[test]
+fn mnt6_753_field_gadgets_test() {
+    use super::*;
+    use crate::{Fq, Fq3, Fq6};
+    use ark_curve_constraint_tests::fields::*;
+
+    field_test::<_, _, FqVar>().unwrap();
+    frobenius_tests::<Fq, _, FqVar>(13).unwrap();
+
+    field_test::<_, _, Fq3Var>().unwrap();
+    frobenius_tests::<Fq3, _, Fq3Var>(13).unwrap();
+
+    field_test::<_, _, Fq6Var>().unwrap();
+    frobenius_tests::<Fq6, _, Fq6Var>(13).unwrap();
+}