ceremonyclient/nekryptology/pkg/sharing/shamir_test.go

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2023-07-05 05:32:28 +00:00
//
// Copyright Coinbase, Inc. All Rights Reserved.
//
// SPDX-License-Identifier: Apache-2.0
//
package sharing
import (
"bytes"
crand "crypto/rand"
"encoding/json"
"testing"
"github.com/stretchr/testify/require"
"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves"
)
func TestShamirSplitInvalidArgs(t *testing.T) {
curve := curves.ED25519()
_, err := NewShamir(0, 0, curve)
require.NotNil(t, err)
_, err = NewShamir(3, 2, curve)
require.NotNil(t, err)
_, err = NewShamir(1, 10, curve)
require.NotNil(t, err)
scheme, err := NewShamir(2, 3, curve)
require.Nil(t, err)
require.NotNil(t, scheme)
_, err = scheme.Split(curve.NewScalar(), crand.Reader)
require.NotNil(t, err)
}
func TestShamirCombineNoShares(t *testing.T) {
curve := curves.ED25519()
scheme, err := NewShamir(2, 3, curve)
require.Nil(t, err)
require.NotNil(t, scheme)
_, err = scheme.Combine()
require.NotNil(t, err)
}
func TestShamirCombineDuplicateShare(t *testing.T) {
curve := curves.ED25519()
scheme, err := NewShamir(2, 3, curve)
require.Nil(t, err)
require.NotNil(t, scheme)
_, err = scheme.Combine([]*ShamirShare{
{
Id: 1,
Value: curve.NewScalar().New(3).Bytes(),
},
{
Id: 1,
Value: curve.NewScalar().New(3).Bytes(),
},
}...)
require.NotNil(t, err)
}
func TestShamirCombineBadIdentifier(t *testing.T) {
curve := curves.ED25519()
scheme, err := NewShamir(2, 3, curve)
require.Nil(t, err)
require.NotNil(t, scheme)
shares := []*ShamirShare{
{
Id: 0,
Value: curve.NewScalar().New(3).Bytes(),
},
{
Id: 2,
Value: curve.NewScalar().New(3).Bytes(),
},
}
_, err = scheme.Combine(shares...)
require.NotNil(t, err)
shares[0] = &ShamirShare{
Id: 4,
Value: curve.NewScalar().New(3).Bytes(),
}
_, err = scheme.Combine(shares...)
require.NotNil(t, err)
}
func TestShamirCombineSingle(t *testing.T) {
curve := curves.ED25519()
scheme, err := NewShamir(2, 3, curve)
require.Nil(t, err)
require.NotNil(t, scheme)
shares, err := scheme.Split(curve.NewScalar().Hash([]byte("test")), crand.Reader)
require.Nil(t, err)
require.NotNil(t, shares)
secret, err := scheme.Combine(shares...)
require.Nil(t, err)
require.Equal(t, secret, curve.NewScalar().Hash([]byte("test")))
}
// Test ComputeL function to compute Lagrange coefficients.
func TestShamirComputeL(t *testing.T) {
curve := curves.ED25519()
scheme, err := NewShamir(2, 2, curve)
require.Nil(t, err)
require.NotNil(t, scheme)
secret := curve.Scalar.Hash([]byte("test"))
shares, err := scheme.Split(secret, crand.Reader)
require.Nil(t, err)
require.NotNil(t, shares)
identities := make([]uint32, 0)
for _, xi := range shares {
identities = append(identities, xi.Id)
}
lCoeffs, err := scheme.LagrangeCoeffs(identities)
require.Nil(t, err)
require.NotNil(t, lCoeffs)
// Checking we can reconstruct the same secret using Lagrange coefficients.
result := curve.NewScalar()
for _, r := range shares {
rc, _ := curve.Scalar.SetBytes(r.Value)
result = result.Add(rc.Mul(lCoeffs[r.Id]))
}
require.Equal(t, result.Bytes(), secret.Bytes())
}
func TestShamirAllCombinations(t *testing.T) {
curve := curves.ED25519()
scheme, err := NewShamir(3, 5, curve)
require.Nil(t, err)
require.NotNil(t, scheme)
secret := curve.Scalar.Hash([]byte("test"))
shares, err := scheme.Split(secret, crand.Reader)
require.Nil(t, err)
require.NotNil(t, shares)
// There are 5*4*3 possible combinations
for i := 0; i < 5; i++ {
for j := 0; j < 5; j++ {
if i == j {
continue
}
for k := 0; k < 5; k++ {
if i == k || j == k {
continue
}
rSecret, err := scheme.Combine(shares[i], shares[j], shares[k])
require.Nil(t, err)
require.NotNil(t, rSecret)
require.Equal(t, rSecret, secret)
}
}
}
}
// Ensures that ShamirShare's un/marshal successfully.
func TestMarshalJsonRoundTrip(t *testing.T) {
curve := curves.ED25519()
shares := []ShamirShare{
{0, curve.Scalar.New(300).Bytes()},
{2, curve.Scalar.New(300000).Bytes()},
{20, curve.Scalar.New(12812798).Bytes()},
{31, curve.Scalar.New(17).Bytes()},
{57, curve.Scalar.New(5066680).Bytes()},
{128, curve.Scalar.New(3005).Bytes()},
{19, curve.Scalar.New(317).Bytes()},
{7, curve.Scalar.New(323).Bytes()},
{222, curve.NewScalar().New(-1).Bytes()},
}
// Run all the tests!
for _, in := range shares {
input, err := json.Marshal(in)
require.NoError(t, err)
require.NotNil(t, input)
// Unmarshal and test
out := &ShamirShare{}
//out.Value = curve.NewScalar()
err = json.Unmarshal(input, &out)
require.NoError(t, err)
require.Equal(t, in.Id, out.Id)
require.Equal(t, bytes.Compare(in.Value, out.Value), 0)
}
}