Use a non-constant generator in FROST

crypto/frost/src/curve/dalek.rs

@@ -28,7 +28,9 @@ macro_rules! dalek_curve {
       type G = $Point;
 
       const ID: &'static [u8] = $ID;
-      const GENERATOR: Self::G = $POINT;
+      fn generator() -> Self::G {
+        $POINT
+      }
 
       fn hash_msg(msg: &[u8]) -> Vec<u8> {
         Sha512::new()

crypto/frost/src/curve/kp256.rs

@@ -31,7 +31,9 @@ macro_rules! kp_curve {
       type G = $lib::ProjectivePoint;
 
       const ID: &'static [u8] = $ID;
-      const GENERATOR: Self::G = $lib::ProjectivePoint::GENERATOR;
+      fn generator() -> Self::G {
+        $lib::ProjectivePoint::GENERATOR
+      }
 
       fn hash_msg(msg: &[u8]) -> Vec<u8> {
         (&Sha256::new().chain($CONTEXT).chain(b"digest").chain(msg).finalize()).to_vec()

crypto/frost/src/curve/mod.rs

@@ -53,7 +53,7 @@ pub trait Curve: Clone + Copy + PartialEq + Eq + Debug + Zeroize {
 
   /// Generator for the group
   // While group does provide this in its API, privacy coins may want to use a custom basepoint
-  const GENERATOR: Self::G;
+  fn generator() -> Self::G;
 
   /// Hash the message for the binding factor. H3 from the IETF draft
   // This doesn't actually need to be part of Curve as it does nothing with the curve