BP Verification (#75)

* Use a struct in an enum for Bulletproofs

* verification bp working for just one proof

* add some more assert tests

* Clean BP verification

* Implement batch verification

* Add a debug assertion w_cache isn't 0

It's initially set to 0 and if not updated, this would be broken.

* Correct Monero workflow yaml

* Again try to corrent Monero workflow yaml

* Again

* Finally

* Re-apply weights as required by Bulletproofs

Removing these was insecure and my fault.

Co-authored-by: DangerousFreedom <dangfreed@tutanota.com>

crypto/dalek-ff-group/src/lib.rs

@@ -372,6 +372,12 @@ dalek_group!(
   ED25519_BASEPOINT_TABLE
 );
 
+impl EdwardsPoint {
+  pub fn mul_by_cofactor(&self) -> EdwardsPoint {
+    EdwardsPoint(self.0.mul_by_cofactor())
+  }
+}
+
 dalek_group!(
   RistrettoPoint,
   DRistrettoPoint,