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sharing/ed25519_feldman_test.go

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+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package sharing
+
+import (
+	crand "crypto/rand"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/sonr-io/sonr/crypto/core/curves"
+)
+
+var testCurve = curves.ED25519()
+
+func TestEd25519FeldmanSplitInvalidArgs(t *testing.T) {
+	_, err := NewFeldman(0, 0, testCurve)
+	require.NotNil(t, err)
+	_, err = NewFeldman(3, 2, testCurve)
+	require.NotNil(t, err)
+	_, err = NewFeldman(1, 10, testCurve)
+	require.NotNil(t, err)
+	scheme, err := NewFeldman(2, 3, testCurve)
+	require.Nil(t, err)
+	require.NotNil(t, scheme)
+	_, _, err = scheme.Split(testCurve.NewScalar(), crand.Reader)
+	require.NotNil(t, err)
+}
+
+func TestEd25519FeldmanCombineNoShares(t *testing.T) {
+	scheme, err := NewFeldman(2, 3, testCurve)
+	require.Nil(t, err)
+	require.NotNil(t, scheme)
+	_, err = scheme.Combine()
+	require.NotNil(t, err)
+}
+
+func TestEd25519FeldmanCombineDuplicateShare(t *testing.T) {
+	scheme, err := NewFeldman(2, 3, testCurve)
+	require.Nil(t, err)
+	require.NotNil(t, scheme)
+	_, err = scheme.Combine([]*ShamirShare{
+		{
+			Id:    1,
+			Value: testCurve.Scalar.New(3).Bytes(),
+		},
+		{
+			Id:    1,
+			Value: testCurve.Scalar.New(3).Bytes(),
+		},
+	}...)
+	require.NotNil(t, err)
+}
+
+func TestEd25519FeldmanCombineBadIdentifier(t *testing.T) {
+	scheme, err := NewFeldman(2, 3, testCurve)
+	require.Nil(t, err)
+	require.NotNil(t, scheme)
+	shares := []*ShamirShare{
+		{
+			Id:    0,
+			Value: testCurve.Scalar.New(3).Bytes(),
+		},
+		{
+			Id:    2,
+			Value: testCurve.Scalar.New(3).Bytes(),
+		},
+	}
+	_, err = scheme.Combine(shares...)
+	require.NotNil(t, err)
+	shares[0] = &ShamirShare{
+		Id:    4,
+		Value: testCurve.Scalar.New(3).Bytes(),
+	}
+	_, err = scheme.Combine(shares...)
+	require.NotNil(t, err)
+}
+
+func TestEd25519FeldmanCombineSingle(t *testing.T) {
+	scheme, err := NewFeldman(2, 3, testCurve)
+	require.Nil(t, err)
+	require.NotNil(t, scheme)
+
+	secret := testCurve.Scalar.Hash([]byte("test"))
+	verifiers, shares, err := scheme.Split(secret, crand.Reader)
+	require.Nil(t, err)
+	require.NotNil(t, shares)
+	for _, s := range shares {
+		err = verifiers.Verify(s)
+		require.Nil(t, err)
+	}
+	secret2, err := scheme.Combine(shares...)
+	require.Nil(t, err)
+	require.Equal(t, secret2, secret)
+}
+
+func TestEd25519FeldmanAllCombinations(t *testing.T) {
+	scheme, err := NewFeldman(3, 5, testCurve)
+	require.Nil(t, err)
+	require.NotNil(t, scheme)
+
+	secret := testCurve.Scalar.Hash([]byte("test"))
+	verifiers, shares, err := scheme.Split(secret, crand.Reader)
+	for _, s := range shares {
+		err = verifiers.Verify(s)
+		require.Nil(t, err)
+	}
+	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)
+			}
+		}
+	}
+}