init: v1.0.0

he/paillier/paillier_op_test.go

@@ -0,0 +1,26 @@
+package paillier
+
+import (
+	"crypto/rand"
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"xdx.jelly/xgcl/grand"
+)
+
+func TestNeg(t *testing.T) {
+	sk, err := GenerateKeyFromPassword(2048, grand.GetRandom(32), grand.GetRandom(32), 1024)
+	assert.Nil(t, err)
+	pk := sk.Public()
+
+	m, _ := rand.Int(grand.Reader, pk.N)
+	mNeg := new(big.Int).Sub(pk.N, m) // n - m
+	c, _ := Encrypt(m, pk, grand.Reader)
+
+	c.Neg(pk) // Enc(n-m) = Enc(m)^-1 mod n^2
+
+	mm, _ := Decrypt(c, sk)
+
+	assert.Zero(t, mm.Cmp(mNeg))
+}