// // Copyright Coinbase, Inc. All Rights Reserved. // // SPDX-License-Identifier: Apache-2.0 // package v1 import ( "crypto/elliptic" "math/big" "testing" "github.com/stretchr/testify/require" ) func TestP256FeldmanSplitInvalidArgs(t *testing.T) { _, err := NewFeldman(0, 0, elliptic.P256()) require.NotNil(t, err) _, err = NewFeldman(3, 2, elliptic.P256()) require.NotNil(t, err) _, err = NewFeldman(1, 10, elliptic.P256()) require.NotNil(t, err) scheme, err := NewFeldman(2, 3, elliptic.P256()) require.Nil(t, err) require.NotNil(t, scheme) _, _, err = scheme.Split([]byte{}) require.NotNil(t, err) _, _, err = scheme.Split([]byte{0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65}) require.NotNil(t, err) } func TestP256FeldmanCombineNoShares(t *testing.T) { scheme, err := NewFeldman(2, 3, elliptic.P256()) require.Nil(t, err) require.NotNil(t, scheme) _, err = scheme.Combine() require.NotNil(t, err) } func TestP256FeldmanCombineDuplicateShare(t *testing.T) { scheme, err := NewFeldman(2, 3, elliptic.P256()) require.Nil(t, err) require.NotNil(t, scheme) _, err = scheme.Combine([]*ShamirShare{ { Identifier: 1, Value: field.NewElement(big.NewInt(3)), }, { Identifier: 1, Value: field.NewElement(big.NewInt(3)), }, }...) require.NotNil(t, err) } func TestP256FeldmanCombineBadIdentifier(t *testing.T) { scheme, err := NewFeldman(2, 3, elliptic.P256()) require.Nil(t, err) require.NotNil(t, scheme) shares := []*ShamirShare{ { Identifier: 0, Value: field.NewElement(big.NewInt(3)), }, { Identifier: 2, Value: field.NewElement(big.NewInt(3)), }, } _, err = scheme.Combine(shares...) require.NotNil(t, err) shares[0] = &ShamirShare{ Identifier: 4, Value: field.NewElement(big.NewInt(3)), } _, err = scheme.Combine(shares...) require.NotNil(t, err) } func TestP256FeldmanCombineSingle(t *testing.T) { scheme, err := NewFeldman(2, 3, elliptic.P256()) require.Nil(t, err) require.NotNil(t, scheme) verifiers, shares, err := scheme.Split([]byte("test")) require.Nil(t, err) require.NotNil(t, shares) for _, s := range shares { ok, err := scheme.Verify(s, verifiers) require.Nil(t, err) require.True(t, ok) } secret, err := scheme.Combine(shares...) require.Nil(t, err) require.Equal(t, secret, []byte("test")) } func TestP256FeldmanAllCombinations(t *testing.T) { scheme, err := NewFeldman(3, 5, elliptic.P256()) require.Nil(t, err) require.NotNil(t, scheme) secret := []byte("test") verifiers, shares, err := scheme.Split(secret) for _, s := range shares { ok, err := scheme.Verify(s, verifiers) require.Nil(t, err) require.True(t, ok) } 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) } } } }