nizk: use Bytes interface for abstraction

1 files changed, 10 insertions, 2 deletions

diff --git a/nizk/nizk.go b/nizk/nizk.go
index 84e7db4..a8bdaae 100644
--- a/nizk/nizk.go
+++ b/nizk/nizk.go
@@ -15,9 +15,17 @@ var Curve = curve.Curve25519
 var G = Curve.Generator()
 var One = Curve.ScalarOne()
 
-func Challenge(points ...*Point) *Scalar {
+type Bytes interface {
+	Bytes() []byte
+}
+
+type Bites []byte
+
+func (b Bites) Bytes() []byte { return b }
+
+func Challenge(bs ...Bytes) *Scalar {
 	h512 := sha512.New()
-	for _, p := range points {
+	for _, p := range bs {
 		h512.Write(p.Bytes())
 	}
 	ch, e := Curve.ScalarFromBytes(h512.Sum(nil))