ceremonyclient/nekryptology/pkg/dkg/gennaro2p/genarro2p_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 gennaro2p
import (
"crypto/elliptic"
"fmt"
"reflect"
"testing"
"github.com/btcsuite/btcd/btcec"
"github.com/stretchr/testify/require"
"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves"
v1 "source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/sharing/v1"
)
var (
curveScalar = curves.NewK256Scalar()
curve = btcec.S256()
)
const (
clientId = 1
serverId = 2
)
// Benchmark full DKG including blind selection and setup
func BenchmarkDkg(b *testing.B) {
if testing.Short() {
b.Skip("skipping test in short mode.")
}
for i := 0; i < b.N; i++ {
_, _, err := dkg()
require.NoError(b, err)
}
}
// Run a DKG and reports the client/server results
func dkg() (*DkgResult, *DkgResult, error) {
// Create client/server
blind, _ := newBlind(curveScalar, curve)
client, err := NewParticipant(clientId, serverId, blind, curveScalar, curve)
if err != nil {
return nil, nil, err
}
server, err := NewParticipant(serverId, clientId, blind, curveScalar, curve)
if err != nil {
return nil, nil, err
}
// R1
clientR1, err := client.Round1(nil)
if err != nil {
return nil, nil, err
}
serverR1, err := server.Round1(nil)
if err != nil {
return nil, nil, err
}
// R2
clientR2, err := client.Round2(serverR1)
if err != nil {
return nil, nil, err
}
serverR2, err := server.Round2(clientR1)
if err != nil {
return nil, nil, err
}
// Finalize
clientResult, err := client.Finalize(serverR2)
if err != nil {
return nil, nil, err
}
serverResult, err := server.Finalize(clientR2)
if err != nil {
return nil, nil, err
}
return clientResult, serverResult, nil
}
// Run a full DKG and verify the absence of errors and valid results
func TestDkg(t *testing.T) {
// Setup and ensure no errors
clientResult, serverResult, err := dkg()
require.NoError(t, err)
require.NotNil(t, clientResult)
require.NotNil(t, serverResult)
// Now run tests
t.Run("produce the same public key", func(t *testing.T) {
require.Equal(t, clientResult.PublicKey, serverResult.PublicKey)
})
t.Run("produce identical public shares", func(t *testing.T) {
require.True(t, reflect.DeepEqual(clientResult.PublicShares, serverResult.PublicShares))
})
t.Run("produce distinct secret shares", func(t *testing.T) {
require.NotEqual(t, clientResult.SecretShare, serverResult.SecretShare)
})
t.Run("produce distinct secret shares", func(t *testing.T) {
require.NotEqual(t, clientResult.SecretShare, serverResult.SecretShare)
})
t.Run("shares sum to expected public key", func(t *testing.T) {
pubkey, err := reconstructPubkey(
clientResult.SecretShare,
serverResult.SecretShare,
curve)
require.NoError(t, err)
require.Equal(t, serverResult.PublicKey, pubkey)
})
}
// Reconstruct the pubkey from 2 shares
func reconstructPubkey(s1, s2 *v1.ShamirShare, curve elliptic.Curve) (*curves.EcPoint, error) {
s, err := v1.NewShamir(2, 2, s1.Value.Field())
if err != nil {
return nil, err
}
sk, err := s.Combine(s1, s2)
if err != nil {
return nil, err
}
x, y := curve.ScalarBaseMult(sk)
return &curves.EcPoint{
Curve: curve,
X: x,
Y: y,
}, nil
}
// Test blind generator helper function produces a value on the expected curve
func TestNewBlindOnCurve(t *testing.T) {
const n = 1024
for i := 0; i < n; i++ {
b, err := newBlind(curveScalar, curve)
require.NoError(t, err)
require.NotNil(t, b)
// Valid point?
require.True(t, b.IsOnCurve() && b.IsValid())
require.True(t, b.IsValid())
require.False(t, b.IsIdentity())
require.False(t, b.IsBasePoint())
}
}
func TestNewBlindProvidesDistinctPoints(t *testing.T) {
const n = 1024
seen := make(map[string]bool, n)
// seen := make(map[core.EcPoint]bool, n)
for i := 0; i < n; i++ {
b, err := newBlind(curveScalar, curve)
require.NoError(t, err)
// serialize so the point is hashable
txt := fmt.Sprintf("%#v", b)
// We shouldn't see the same point twice
ok := seen[txt]
require.False(t, ok)
// store
seen[txt] = true
}
}