fixup! homomorphic: big refactor, renamed homomorphic -> elgamal

add method Ciphertext.Select
vocdoni · Dec 6, 2024 · cd5b6db · cd5b6db
1 parent da1f17a
commit cd5b6db
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/elgamal/add.go b/elgamal/add.go
@@ -33,3 +33,12 @@ func (z *Ciphertext) AssertIsEqual(api frontend.API, x *Ciphertext) {
 	api.AssertIsEqual(z.C2.X, x.C2.X)
 	api.AssertIsEqual(z.C2.Y, x.C2.Y)
 }
+
+// Select if b is true, sets z = i1, else z = i2, and returns z
+func (z *Ciphertext) Select(api frontend.API, b frontend.Variable, i1 *Ciphertext, i2 *Ciphertext) *Ciphertext {
+	z.C1.X = api.Select(b, i1.C1.X, i2.C1.X)
+	z.C1.Y = api.Select(b, i1.C1.Y, i2.C1.Y)
+	z.C2.X = api.Select(b, i1.C2.X, i2.C2.X)
+	z.C2.Y = api.Select(b, i1.C2.Y, i2.C2.Y)
+	return z
+}