Add common/Leaf struct & parsers (bigint & byte arrays)

common/errors.go

@@ -0,0 +1,9 @@
+package common
+
+import "errors"
+
+// ErrNotInFF is used when the *big.Int does not fit inside the Finite Field
+var ErrNotInFF = errors.New("BigInt not inside the Finite Field")
+
+// ErrNumOverflow is used when a given value overflows the maximum capacity of the parameter
+var ErrNumOverflow = errors.New("Value overflows the type")

common/leaf.go

@@ -0,0 +1,117 @@
+package common
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"math"
+	"math/big"
+
+	eth "github.com/ethereum/go-ethereum/common"
+	cryptoUtils "github.com/iden3/go-iden3-crypto/utils"
+)
+
+// Leaf is the data structure stored in the Leaf of the MerkleTree
+type Leaf struct {
+	TokenID TokenID
+	Nonce   uint64   // max of 40 bits used
+	Balance *big.Int // max of 192 bits used
+	Ax      *big.Int
+	Ay      *big.Int
+	EthAddr eth.Address
+}
+
+// Bytes returns the bytes representing the Leaf, in a way that each BigInt is represented by 32 bytes, in spite of the BigInt could be represented in less bytes (due a small big.Int), so in this way each BigInt is always 32 bytes and can be automatically parsed from a byte array.
+func (l *Leaf) Bytes() ([32 * 5]byte, error) {
+	var b [32 * 5]byte
+
+	if l.Nonce >= uint64(math.Pow(2, 40)) {
+		return b, fmt.Errorf("%s Nonce", ErrNumOverflow)
+	}
+	if len(l.Balance.Bytes()) > 24 {
+		return b, fmt.Errorf("%s Balance", ErrNumOverflow)
+	}
+
+	var tokenIDBytes [4]byte
+	binary.LittleEndian.PutUint32(tokenIDBytes[:], uint32(l.TokenID))
+	var nonceBytes [8]byte
+	binary.LittleEndian.PutUint64(nonceBytes[:], l.Nonce)
+
+	copy(b[0:4], tokenIDBytes[:])
+	copy(b[4:9], nonceBytes[:])
+	copy(b[32:64], SwapEndianness(l.Balance.Bytes())) // SwapEndianness, as big.Int uses BigEndian
+	copy(b[64:96], SwapEndianness(l.Ax.Bytes()))
+	copy(b[96:128], SwapEndianness(l.Ay.Bytes()))
+	copy(b[128:148], l.EthAddr.Bytes())
+
+	return b, nil
+}
+
+// BigInts returns the [5]*big.Int, where each *big.Int is inside the Finite Field
+func (l *Leaf) BigInts() ([5]*big.Int, error) {
+	e := [5]*big.Int{}
+
+	b, err := l.Bytes()
+	if err != nil {
+		return e, err
+	}
+
+	e[0] = new(big.Int).SetBytes(SwapEndianness(b[0:32]))
+	e[1] = new(big.Int).SetBytes(SwapEndianness(b[32:64]))
+	e[2] = new(big.Int).SetBytes(SwapEndianness(b[64:96]))
+	e[3] = new(big.Int).SetBytes(SwapEndianness(b[96:128]))
+	e[4] = new(big.Int).SetBytes(SwapEndianness(b[128:160]))
+
+	return e, nil
+}
+
+// LeafFromBigInts returns a Leaf from a [5]*big.Int
+func LeafFromBigInts(e [5]*big.Int) (*Leaf, error) {
+	if !cryptoUtils.CheckBigIntArrayInField(e[:]) {
+		return nil, ErrNotInFF
+	}
+	var b [32 * 5]byte
+	copy(b[0:32], SwapEndianness(e[0].Bytes())) // SwapEndianness, as big.Int uses BigEndian
+	copy(b[32:64], SwapEndianness(e[1].Bytes()))
+	copy(b[64:96], SwapEndianness(e[2].Bytes()))
+	copy(b[96:128], SwapEndianness(e[3].Bytes()))
+	copy(b[128:160], SwapEndianness(e[4].Bytes()))
+
+	return LeafFromBytes(b)
+}
+
+// LeafFromBytes returns a Leaf from a byte array
+func LeafFromBytes(b [32 * 5]byte) (*Leaf, error) {
+	tokenID := binary.LittleEndian.Uint32(b[0:4])
+	nonce := binary.LittleEndian.Uint64(b[4:12])
+	if !bytes.Equal(b[9:12], []byte{0, 0, 0}) { // alternatively: if nonce >= uint64(math.Pow(2, 40)) {
+		return nil, fmt.Errorf("%s Nonce", ErrNumOverflow)
+	}
+	balance := new(big.Int).SetBytes(SwapEndianness(b[32:56])) // b[32:56], as Balance is 192 bits (24 bytes)
+	if !bytes.Equal(b[56:64], []byte{0, 0, 0, 0, 0, 0, 0, 0}) {
+		return nil, fmt.Errorf("%s Balance", ErrNumOverflow)
+	}
+	ax := new(big.Int).SetBytes(SwapEndianness(b[64:96])) // SwapEndianness, as big.Int uses BigEndian
+	ay := new(big.Int).SetBytes(SwapEndianness(b[96:128]))
+	ethAddr := eth.BytesToAddress(b[128:148])
+
+	if !cryptoUtils.CheckBigIntInField(balance) {
+		return nil, ErrNotInFF
+	}
+	if !cryptoUtils.CheckBigIntInField(ax) {
+		return nil, ErrNotInFF
+	}
+	if !cryptoUtils.CheckBigIntInField(ay) {
+		return nil, ErrNotInFF
+	}
+
+	l := Leaf{
+		TokenID: TokenID(tokenID),
+		Nonce:   nonce,
+		Balance: balance,
+		Ax:      ax,
+		Ay:      ay,
+		EthAddr: ethAddr,
+	}
+	return &l, nil
+}

common/leaf_test.go

@@ -0,0 +1,164 @@
+package common
+
+import (
+	"fmt"
+	"math"
+	"math/big"
+	"testing"
+
+	ethCommon "github.com/ethereum/go-ethereum/common"
+	cryptoConstants "github.com/iden3/go-iden3-crypto/constants"
+	cryptoUtils "github.com/iden3/go-iden3-crypto/utils"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLeaf(t *testing.T) {
+	leaf := &Leaf{
+		TokenID: TokenID(1),
+		Nonce:   uint64(1234),
+		Balance: big.NewInt(1000),
+		Ax:      big.NewInt(9876),
+		Ay:      big.NewInt(6789),
+		EthAddr: ethCommon.HexToAddress("0xc58d29fA6e86E4FAe04DDcEd660d45BCf3Cb2370"),
+	}
+	b, err := leaf.Bytes()
+	assert.Nil(t, err)
+	l1, err := LeafFromBytes(b)
+	assert.Nil(t, err)
+	assert.Equal(t, leaf, l1)
+
+	e, err := leaf.BigInts()
+	assert.Nil(t, err)
+	assert.True(t, cryptoUtils.CheckBigIntInField(e[0]))
+	assert.True(t, cryptoUtils.CheckBigIntInField(e[1]))
+	assert.True(t, cryptoUtils.CheckBigIntInField(e[2]))
+	assert.True(t, cryptoUtils.CheckBigIntInField(e[3]))
+	assert.True(t, cryptoUtils.CheckBigIntInField(e[4]))
+
+	assert.Equal(t, "1000", e[1].String())
+	assert.Equal(t, "9876", e[2].String())
+	assert.Equal(t, "6789", e[3].String())
+
+	l2, err := LeafFromBigInts(e)
+	assert.Nil(t, err)
+	assert.Equal(t, leaf, l2)
+	assert.Equal(t, l1, l2)
+}
+
+// func TestLeafLoop(t *testing.T) {
+//         // check that for different Address there is no problem
+//         for i := 0; i < 256; i++ {
+//                 key, err := ethCrypto.GenerateKey()
+//                 assert.Nil(t, err)
+//                 address := ethCrypto.PubkeyToAddress(key.PublicKey)
+//
+//                 leaf := &Leaf{
+//                         TokenID: TokenID(i),
+//                         Nonce:   uint64(i),
+//                         Balance: big.NewInt(1000),
+//                         Ax:      big.NewInt(9876),
+//                         Ay:      big.NewInt(6789),
+//                         EthAddr: address,
+//                 }
+//                 b, err := leaf.Bytes()
+//                 assert.Nil(t, err)
+//                 l1, err := LeafFromBytes(b)
+//                 assert.Nil(t, err)
+//                 assert.Equal(t, leaf, l1)
+//
+//                 e, err := leaf.BigInts()
+//                 assert.Nil(t, err)
+//                 assert.True(t, cryptoUtils.CheckBigIntInField(e[0]))
+//                 assert.True(t, cryptoUtils.CheckBigIntInField(e[1]))
+//                 assert.True(t, cryptoUtils.CheckBigIntInField(e[2]))
+//                 assert.True(t, cryptoUtils.CheckBigIntInField(e[3]))
+//                 assert.True(t, cryptoUtils.CheckBigIntInField(e[4]))
+//
+//                 l2, err := LeafFromBigInts(e)
+//                 assert.Nil(t, err)
+//                 assert.Equal(t, leaf, l2)
+//         }
+// }
+
+func TestLeafErrNotInFF(t *testing.T) {
+	z := big.NewInt(0)
+
+	// Q-1 should not give error
+	r := new(big.Int).Sub(cryptoConstants.Q, big.NewInt(1))
+	e := [5]*big.Int{z, z, r, r, r}
+	_, err := LeafFromBigInts(e)
+	assert.Nil(t, err)
+
+	// Q should give error
+	r = cryptoConstants.Q
+	e = [5]*big.Int{z, z, r, r, r}
+	_, err = LeafFromBigInts(e)
+	assert.NotNil(t, err)
+	assert.Equal(t, ErrNotInFF, err)
+
+	// Q+1 should give error
+	r = new(big.Int).Add(cryptoConstants.Q, big.NewInt(1))
+	e = [5]*big.Int{z, z, r, r, r}
+	_, err = LeafFromBigInts(e)
+	assert.NotNil(t, err)
+	assert.Equal(t, ErrNotInFF, err)
+}
+
+func TestLeafErrNumOverflowNonce(t *testing.T) {
+	// check limit
+	leaf := &Leaf{
+		TokenID: TokenID(1),
+		Nonce:   uint64(math.Pow(2, 40) - 1),
+		Balance: big.NewInt(1000),
+		Ax:      big.NewInt(9876),
+		Ay:      big.NewInt(6789),
+		EthAddr: ethCommon.HexToAddress("0xc58d29fA6e86E4FAe04DDcEd660d45BCf3Cb2370"),
+	}
+	_, err := leaf.Bytes()
+	assert.Nil(t, err)
+
+	// force value overflow
+	leaf.Nonce = uint64(math.Pow(2, 40))
+	b, err := leaf.Bytes()
+	assert.NotNil(t, err)
+	assert.Equal(t, fmt.Errorf("%s Nonce", ErrNumOverflow), err)
+
+	_, err = LeafFromBytes(b)
+	assert.Nil(t, err)
+
+	b[9] = 1
+	_, err = LeafFromBytes(b)
+	assert.NotNil(t, err)
+	assert.Equal(t, fmt.Errorf("%s Nonce", ErrNumOverflow), err)
+}
+
+func TestLeafErrNumOverflowBalance(t *testing.T) {
+	// check limit
+	leaf := &Leaf{
+		TokenID: TokenID(1),
+		Nonce:   uint64(math.Pow(2, 40) - 1),
+		Balance: new(big.Int).Sub(new(big.Int).Exp(big.NewInt(2), big.NewInt(192), nil), big.NewInt(1)),
+		Ax:      big.NewInt(9876),
+		Ay:      big.NewInt(6789),
+		EthAddr: ethCommon.HexToAddress("0xc58d29fA6e86E4FAe04DDcEd660d45BCf3Cb2370"),
+	}
+	assert.Equal(t, "6277101735386680763835789423207666416102355444464034512895", leaf.Balance.String())
+
+	_, err := leaf.Bytes()
+	assert.Nil(t, err)
+
+	// force value overflow
+	leaf.Balance = new(big.Int).Exp(big.NewInt(2), big.NewInt(192), nil)
+	assert.Equal(t, "6277101735386680763835789423207666416102355444464034512896", leaf.Balance.String())
+	b, err := leaf.Bytes()
+	assert.NotNil(t, err)
+	assert.Equal(t, fmt.Errorf("%s Balance", ErrNumOverflow), err)
+
+	_, err = LeafFromBytes(b)
+	assert.Nil(t, err)
+
+	b[56] = 1
+	_, err = LeafFromBytes(b)
+	assert.NotNil(t, err)
+	assert.Equal(t, fmt.Errorf("%s Balance", ErrNumOverflow), err)
+}

common/utils.go

@@ -0,0 +1,10 @@
+package common
+
+// SwapEndianness swaps the order of the bytes in the slice.
+func SwapEndianness(b []byte) []byte {
+	o := make([]byte, len(b))
+	for i := range b {
+		o[len(b)-1-i] = b[i]
+	}
+	return o
+}

go.mod

@@ -4,7 +4,8 @@ go 1.14
 
 require (
 	github.com/ethereum/go-ethereum v1.9.17
-	github.com/iden3/go-iden3-crypto v0.0.5
+	github.com/iden3/go-iden3-crypto v0.0.6-0.20200723082457-29a66457f0bf
+	github.com/iden3/go-merkletree v0.0.0-20200723202738-75e24244a1e3
 	github.com/jinzhu/gorm v1.9.15
 	github.com/stretchr/testify v1.6.1
 )

go.sum

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