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witness_test.go
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//
// Copyright Coinbase, Inc. All Rights Reserved.
//
// SPDX-License-Identifier: Apache-2.0
//
package accumulator
import (
"testing"
"github.com/stretchr/testify/require"
"github.com/coinbase/kryptology/pkg/core/curves"
)
func Test_Membership_Witness_New(t *testing.T) {
curve := curves.BLS12381(&curves.PointBls12381G1{})
var seed [32]byte
key, _ := new(SecretKey).New(curve, seed[:])
acc, _ := new(Accumulator).New(curve)
e := curve.Scalar.New(2)
mw, err := new(MembershipWitness).New(e, acc, key)
require.NoError(t, err)
require.NotNil(t, mw.c)
require.NotNil(t, mw.y)
}
func Test_Membership_Witness_Marshal(t *testing.T) {
curve := curves.BLS12381(&curves.PointBls12381G1{})
mw := &MembershipWitness{
curve.PointG1.Generator().Mul(curve.Scalar.New(10)),
curve.Scalar.New(15),
}
data, err := mw.MarshalBinary()
require.NoError(t, err)
require.NotNil(t, data)
newMW := &MembershipWitness{}
err = newMW.UnmarshalBinary(data)
require.NoError(t, err)
require.True(t, mw.c.Equal(newMW.c))
require.Equal(t, 0, mw.y.Cmp(newMW.y))
}
func Test_Membership(t *testing.T) {
curve := curves.BLS12381(&curves.PointBls12381G1{})
sk, _ := new(SecretKey).New(curve, []byte("1234567890"))
pk, _ := sk.GetPublicKey(curve)
element1 := curve.Scalar.Hash([]byte("3"))
element2 := curve.Scalar.Hash([]byte("4"))
element3 := curve.Scalar.Hash([]byte("5"))
element4 := curve.Scalar.Hash([]byte("6"))
element5 := curve.Scalar.Hash([]byte("7"))
element6 := curve.Scalar.Hash([]byte("8"))
element7 := curve.Scalar.Hash([]byte("9"))
elements := []Element{element1, element2, element3, element4, element5, element6, element7}
// nm_witness_max works as well if set to value larger than 0 for this test.x
acc, err := new(Accumulator).WithElements(curve, sk, elements)
require.NoError(t, err)
require.NotNil(t, acc.value)
require.False(t, acc.value.IsIdentity())
require.True(t, acc.value.IsOnCurve())
require.NotEqual(t, acc.value, curve.NewG1GeneratorPoint())
wit, err := new(MembershipWitness).New(elements[3], acc, sk)
require.NoError(t, err)
require.Equal(t, wit.y, elements[3])
err = wit.Verify(pk, acc)
require.NoError(t, err)
// Test wrong cases, forge a wrong witness
wrongWit := MembershipWitness{
curve.PointG1.Identity(),
curve.Scalar.One(),
}
err = wrongWit.Verify(pk, acc)
require.Error(t, err)
// Test wrong cases, forge a wrong accumulator
wrongAcc := &Accumulator{
curve.PointG1.Generator(),
}
err = wit.Verify(pk, wrongAcc)
require.Error(t, err)
}
func Test_Membership_Batch_Update(t *testing.T) {
curve := curves.BLS12381(&curves.PointBls12381G1{})
sk, _ := new(SecretKey).New(curve, []byte("1234567890"))
pk, _ := sk.GetPublicKey(curve)
element1 := curve.Scalar.Hash([]byte("3"))
element2 := curve.Scalar.Hash([]byte("4"))
element3 := curve.Scalar.Hash([]byte("5"))
element4 := curve.Scalar.Hash([]byte("6"))
element5 := curve.Scalar.Hash([]byte("7"))
element6 := curve.Scalar.Hash([]byte("8"))
element7 := curve.Scalar.Hash([]byte("9"))
elements := []Element{element1, element2, element3, element4, element5, element6, element7}
// nm_witness_max works as well if set to value larger than 0 for this test.
acc, err := new(Accumulator).WithElements(curve, sk, elements)
require.NoError(t, err)
require.NotNil(t, acc.value)
wit, err := new(MembershipWitness).New(elements[3], acc, sk)
require.NoError(t, err)
require.Equal(t, wit.y, elements[3])
err = wit.Verify(pk, acc)
require.Nil(t, err)
data1 := curve.Scalar.Hash([]byte("1"))
data2 := curve.Scalar.Hash([]byte("2"))
data3 := curve.Scalar.Hash([]byte("3"))
data4 := curve.Scalar.Hash([]byte("4"))
data5 := curve.Scalar.Hash([]byte("5"))
data := []Element{data1, data2, data3, data4, data5}
additions := data[0:2]
deletions := data[2:5]
_, coefficients, err := acc.Update(sk, additions, deletions)
require.NoError(t, err)
require.NotNil(t, coefficients)
_, err = wit.BatchUpdate(additions, deletions, coefficients)
require.NoError(t, err)
err = wit.Verify(pk, acc)
require.Nil(t, err)
}
func Test_Membership_Multi_Batch_Update(t *testing.T) {
curve := curves.BLS12381(&curves.PointBls12381G1{})
sk, _ := new(SecretKey).New(curve, []byte("1234567890"))
pk, _ := sk.GetPublicKey(curve)
element1 := curve.Scalar.Hash([]byte("3"))
element2 := curve.Scalar.Hash([]byte("4"))
element3 := curve.Scalar.Hash([]byte("5"))
element4 := curve.Scalar.Hash([]byte("6"))
element5 := curve.Scalar.Hash([]byte("7"))
element6 := curve.Scalar.Hash([]byte("8"))
element7 := curve.Scalar.Hash([]byte("9"))
element8 := curve.Scalar.Hash([]byte("10"))
element9 := curve.Scalar.Hash([]byte("11"))
element10 := curve.Scalar.Hash([]byte("12"))
element11 := curve.Scalar.Hash([]byte("13"))
element12 := curve.Scalar.Hash([]byte("14"))
element13 := curve.Scalar.Hash([]byte("15"))
element14 := curve.Scalar.Hash([]byte("16"))
element15 := curve.Scalar.Hash([]byte("17"))
element16 := curve.Scalar.Hash([]byte("18"))
element17 := curve.Scalar.Hash([]byte("19"))
element18 := curve.Scalar.Hash([]byte("20"))
elements := []Element{
element1,
element2,
element3,
element4,
element5,
element6,
element7,
element8,
element9,
element10,
element11,
element12,
element13,
element14,
element15,
element16,
element17,
element18,
}
acc, err := new(Accumulator).WithElements(curve, sk, elements)
require.NoError(t, err)
require.NotNil(t, acc.value)
wit, err := new(MembershipWitness).New(elements[3], acc, sk)
require.NoError(t, err)
err = wit.Verify(pk, acc)
require.Nil(t, err)
data1 := curve.Scalar.Hash([]byte("1"))
data2 := curve.Scalar.Hash([]byte("2"))
data3 := curve.Scalar.Hash([]byte("3"))
data4 := curve.Scalar.Hash([]byte("4"))
data5 := curve.Scalar.Hash([]byte("5"))
data := []Element{data1, data2, data3, data4, data5}
adds1 := data[0:2]
dels1 := data[2:5]
_, coeffs1, err := acc.Update(sk, adds1, dels1)
require.NoError(t, err)
require.NotNil(t, coeffs1)
dels2 := elements[8:10]
_, coeffs2, err := acc.Update(sk, []Element{}, dels2)
require.NoError(t, err)
require.NotNil(t, coeffs2)
dels3 := elements[11:14]
_, coeffs3, err := acc.Update(sk, []Element{}, dels3)
require.NoError(t, err)
require.NotNil(t, coeffs3)
a := make([][]Element, 3)
a[0] = adds1
a[1] = []Element{}
a[2] = []Element{}
d := make([][]Element, 3)
d[0] = dels1
d[1] = dels2
d[2] = dels3
c := make([][]Coefficient, 3)
c[0] = coeffs1
c[1] = coeffs2
c[2] = coeffs3
_, err = wit.MultiBatchUpdate(a, d, c)
require.NoError(t, err)
err = wit.Verify(pk, acc)
require.Nil(t, err)
}