Add the ed25519 curve (#121)

* add ed25519 curve

* changelog

* curve info

* fix

* cleanup the script

* Update ed25519/src/curves/mod.rs

* Update ed25519/src/curves/mod.rs

Co-authored-by: onewayfunc <onewayfunc@gmail.com>

ed25519/src/constraints/curves.rs

@@ -0,0 +1,11 @@
+use ark_r1cs_std::groups::curves::twisted_edwards::AffineVar;
+
+use crate::{constraints::FqVar, *};
+
+/// A variable that is the R1CS equivalent of `crate::EdwardsAffine`.
+pub type EdwardsVar = AffineVar<EdwardsParameters, FqVar>;
+
+#[test]
+fn test() {
+    ark_curve_constraint_tests::curves::te_test::<EdwardsParameters, EdwardsVar>().unwrap();
+}

ed25519/src/constraints/fields.rs

@@ -0,0 +1,11 @@
+use ark_r1cs_std::fields::fp::FpVar;
+
+use crate::Fq;
+
+/// A variable that is the R1CS equivalent of `crate::Fq`.
+pub type FqVar = FpVar<Fq>;
+
+#[test]
+fn test() {
+    ark_curve_constraint_tests::fields::field_test::<_, _, FqVar>().unwrap();
+}

ed25519/src/constraints/mod.rs

@@ -0,0 +1,8 @@
+//! This module implements the R1CS equivalent of `ark_ed25519`.
+//! It requires a curve that embeds ed25519.
+
+mod curves;
+mod fields;
+
+pub use curves::*;
+pub use fields::*;