hermez-node/common/pooll2tx_test.go

package common

import (
	"encoding/hex"
	"math/big"
	"testing"

	ethCommon "github.com/ethereum/go-ethereum/common"
	"github.com/iden3/go-iden3-crypto/babyjub"
	"github.com/stretchr/testify/assert"
)

func TestNewPoolL2Tx(t *testing.T) {
	toIdx := new(Idx)
	*toIdx = 300
	poolL2Tx := &PoolL2Tx{
		FromIdx: 87654,
		ToIdx:   toIdx,
		Amount:  big.NewInt(4),
		TokenID: 5,
		Nonce:   144,
	}
	poolL2Tx, err := NewPoolL2Tx(poolL2Tx)
	assert.Nil(t, err)
	assert.Equal(t, "0x020000000156660000000090", poolL2Tx.TxID.String())
}

func TestTxCompressedData(t *testing.T) {
	var sk babyjub.PrivateKey
	_, err := hex.Decode(sk[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
	assert.Nil(t, err)
	toIdx := new(Idx)
	*toIdx = 3
	tx := PoolL2Tx{
		FromIdx: 2,
		ToIdx:   toIdx,
		Amount:  big.NewInt(4),
		TokenID: 5,
		Nonce:   6,
		ToBJJ:   sk.Public(),
	}
	txCompressedData, err := tx.TxCompressedData()
	assert.Nil(t, err)
	// test vector value generated from javascript implementation
	expectedStr := "1766847064778421992193717128424891165872736891548909569553540449389241871"
	assert.Equal(t, expectedStr, txCompressedData.String())
	expected, ok := new(big.Int).SetString(expectedStr, 10)
	assert.True(t, ok)
	assert.Equal(t, expected.Bytes(), txCompressedData.Bytes())
	assert.Equal(t, "10000000000060000000500040000000000030000000000020001c60be60f", hex.EncodeToString(txCompressedData.Bytes())[1:])
	*toIdx = 8
	tx = PoolL2Tx{
		FromIdx: 7,
		ToIdx:   toIdx,
		Amount:  big.NewInt(9),
		TokenID: 10,
		Nonce:   11,
		Fee:     12,
		ToBJJ:   sk.Public(),
	}
	txCompressedData, err = tx.TxCompressedDataV2()
	assert.Nil(t, err)
	// test vector value generated from javascript implementation
	expectedStr = "6571340879233176732837827812956721483162819083004853354503"
	assert.Equal(t, expectedStr, txCompressedData.String())
	expected, ok = new(big.Int).SetString(expectedStr, 10)
	assert.True(t, ok)
	assert.Equal(t, expected.Bytes(), txCompressedData.Bytes())
	assert.Equal(t, "10c000000000b0000000a0009000000000008000000000007", hex.EncodeToString(txCompressedData.Bytes())[1:])
}

func TestHashToSign(t *testing.T) {
	var sk babyjub.PrivateKey
	_, err := hex.Decode(sk[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
	assert.Nil(t, err)
	ethAddr := ethCommon.HexToAddress("0xc58d29fA6e86E4FAe04DDcEd660d45BCf3Cb2370")
	toIdx := new(Idx)
	*toIdx = 3
	tx := PoolL2Tx{
		FromIdx:     2,
		ToIdx:       toIdx,
		Amount:      big.NewInt(4),
		TokenID:     5,
		Nonce:       6,
		ToBJJ:       sk.Public(),
		RqToEthAddr: &ethAddr,
		RqToBJJ:     sk.Public(),
	}
	toSign, err := tx.HashToSign()
	assert.Nil(t, err)
	assert.Equal(t, "14526446928649310956370997581245770629723313742905751117262272426489782809503", toSign.String())
}

func TestVerifyTxSignature(t *testing.T) {
	var sk babyjub.PrivateKey
	_, err := hex.Decode(sk[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
	assert.Nil(t, err)
	ethAddr := ethCommon.HexToAddress("0xc58d29fA6e86E4FAe04DDcEd660d45BCf3Cb2370")
	toIdx := new(Idx)
	*toIdx = 3
	tx := PoolL2Tx{
		FromIdx:     2,
		ToIdx:       toIdx,
		Amount:      big.NewInt(4),
		TokenID:     5,
		Nonce:       6,
		ToBJJ:       sk.Public(),
		RqToEthAddr: &ethAddr,
		RqToBJJ:     sk.Public(),
	}
	toSign, err := tx.HashToSign()
	assert.Nil(t, err)
	assert.Equal(t, "14526446928649310956370997581245770629723313742905751117262272426489782809503", toSign.String())

	sig := sk.SignPoseidon(toSign)
	tx.Signature = sig
	assert.True(t, tx.VerifySignature(sk.Public()))
}