Enforce that Fr of Engine is the scalar for curve points, for simpler downstream abstractions.

7 years ago · 471db6ab27
1 changed files with 2 additions and 2 deletions
--- a/src/lib.rs
+++ b/src/lib.rs
@ -97,7 +97,7 @@ pub trait CurveProjective: PartialEq +
                           rand::Rand +
                           'static
 {
-    type Engine: Engine;
+    type Engine: Engine<Fr=Self::Scalar>;
    type Scalar: PrimeField;
    type Base: SqrtField;
    type Affine: CurveAffine<Projective=Self, Scalar=Self::Scalar>;
@ -166,7 +166,7 @@ pub trait CurveAffine: Copy +
                       Eq +
                       'static
 {
-    type Engine: Engine;
+    type Engine: Engine<Fr=Self::Scalar>;
    type Scalar: PrimeField;
    type Base: SqrtField;
    type Projective: CurveProjective<Affine=Self, Scalar=Self::Scalar>;