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// Package common contains all the common data structures used at the
// hermez-node, zk.go contains the zkSnark inputs used to generate the proof
package common
import (
"crypto/sha256"
"encoding/binary"
"encoding/json"
"fmt"
"math/big"
"github.com/hermeznetwork/hermez-node/log"
"github.com/hermeznetwork/tracerr"
cryptoConstants "github.com/iden3/go-iden3-crypto/constants"
"github.com/iden3/go-merkletree"
"github.com/mitchellh/mapstructure"
)
// ZKMetadata contains ZKInputs metadata that is not used directly in the
// ZKInputs result, but to calculate values for Hash check
type ZKMetadata struct {
// Circuit parameters
// absolute maximum of L1 or L2 transactions allowed
NTx uint32
// merkle tree depth
NLevels uint32
MaxLevels uint32
// absolute maximum of L1 transaction allowed
MaxL1Tx uint32
// total txs allowed
MaxTx uint32
// Maximum number of Idxs where Fees can be send in a batch (currently
// is constant for all circuits: 64)
MaxFeeIdxs uint32
L1TxsData [][]byte
L1TxsDataAvailability [][]byte
L2TxsData [][]byte
ChainID uint16
NewLastIdxRaw Idx
NewStateRootRaw *merkletree.Hash
NewExitRootRaw *merkletree.Hash
}
// ZKInputs represents the inputs that will be used to generate the zkSNARK proof
type ZKInputs struct {
Metadata ZKMetadata `json:"-"`
//
// General
//
// CurrentNumBatch is the current batch number processed
CurrentNumBatch *big.Int `json:"currentNumBatch"` // uint32
// inputs for final `hashGlobalInputs`
// OldLastIdx is the last index assigned to an account
OldLastIdx *big.Int `json:"oldLastIdx"` // uint64 (max nLevels bits)
// OldStateRoot is the current state merkle tree root
OldStateRoot *big.Int `json:"oldStateRoot"` // Hash
// GlobalChainID is the blockchain ID (0 for Ethereum mainnet). This
// value can be get from the smart contract.
GlobalChainID *big.Int `json:"globalChainID"` // uint16
// FeeIdxs is an array of merkle tree indexes where the coordinator
// will receive the accumulated fees
FeeIdxs []*big.Int `json:"feeIdxs"` // uint64 (max nLevels bits), len: [maxFeeIdxs]
// accumulate fees
// FeePlanTokens contains all the tokenIDs for which the fees are being accumulated
FeePlanTokens []*big.Int `json:"feePlanTokens"` // uint32 (max nLevels bits), len: [maxFeeIdxs]
//
// Txs (L1&L2)
//
// transaction L1-L2
// TxCompressedData
TxCompressedData []*big.Int `json:"txCompressedData"` // big.Int (max 251 bits), len: [nTx]
// TxCompressedDataV2, only used in L2Txs, in L1Txs is set to 0
TxCompressedDataV2 []*big.Int `json:"txCompressedDataV2"` // big.Int (max 193 bits), len: [nTx]
// MaxNumBatch is the maximum allowed batch number when the transaction
// can be processed
MaxNumBatch []*big.Int `json:"maxNumBatch"` // uint32
// FromIdx
FromIdx []*big.Int `json:"fromIdx"` // uint64 (max nLevels bits), len: [nTx]
// AuxFromIdx is the Idx of the new created account which is consequence of a L1CreateAccountTx
AuxFromIdx []*big.Int `json:"auxFromIdx"` // uint64 (max nLevels bits), len: [nTx]
// ToIdx
ToIdx []*big.Int `json:"toIdx"` // uint64 (max nLevels bits), len: [nTx]
// AuxToIdx is the Idx of the Tx that has 'toIdx==0', is the
// coordinator who will find which Idx corresponds to the 'toBJJAy' or
// 'toEthAddr'
AuxToIdx []*big.Int `json:"auxToIdx"` // uint64 (max nLevels bits), len: [nTx]
// ToBJJAy
ToBJJAy []*big.Int `json:"toBjjAy"` // big.Int, len: [nTx]
// ToEthAddr
ToEthAddr []*big.Int `json:"toEthAddr"` // ethCommon.Address, len: [nTx]
// OnChain determines if is L1 (1/true) or L2 (0/false)
OnChain []*big.Int `json:"onChain"` // bool, len: [nTx]
//
// Txs/L1Txs
//
// NewAccount boolean (0/1) flag set 'true' when L1 tx creates a new account (fromIdx==0)
NewAccount []*big.Int `json:"newAccount"` // bool, len: [nTx]
// DepositAmountF encoded as float16
DepositAmountF []*big.Int `json:"loadAmountF"` // uint16, len: [nTx]
// FromEthAddr
FromEthAddr []*big.Int `json:"fromEthAddr"` // ethCommon.Address, len: [nTx]
// FromBJJCompressed boolean encoded where each value is a *big.Int
FromBJJCompressed [][256]*big.Int `json:"fromBjjCompressed"` // bool array, len: [nTx][256]
//
// Txs/L2Txs
//
// RqOffset relative transaction position to be linked. Used to perform atomic transactions.
RqOffset []*big.Int `json:"rqOffset"` // uint8 (max 3 bits), len: [nTx]
// transaction L2 request data
// RqTxCompressedDataV2
RqTxCompressedDataV2 []*big.Int `json:"rqTxCompressedDataV2"` // big.Int (max 251 bits), len: [nTx]
// RqToEthAddr
RqToEthAddr []*big.Int `json:"rqToEthAddr"` // ethCommon.Address, len: [nTx]
// RqToBJJAy
RqToBJJAy []*big.Int `json:"rqToBjjAy"` // big.Int, len: [nTx]
// transaction L2 signature
// S
S []*big.Int `json:"s"` // big.Int, len: [nTx]
// R8x
R8x []*big.Int `json:"r8x"` // big.Int, len: [nTx]
// R8y
R8y []*big.Int `json:"r8y"` // big.Int, len: [nTx]
//
// State MerkleTree Leafs transitions
//
// state 1, value of the sender (from) account leaf. The values at the
// moment pre-smtprocessor of the update (before updating the Sender
// leaf).
TokenID1 []*big.Int `json:"tokenID1"` // uint32, len: [nTx]
Nonce1 []*big.Int `json:"nonce1"` // uint64 (max 40 bits), len: [nTx]
Sign1 []*big.Int `json:"sign1"` // bool, len: [nTx]
Ay1 []*big.Int `json:"ay1"` // big.Int, len: [nTx]
Balance1 []*big.Int `json:"balance1"` // big.Int (max 192 bits), len: [nTx]
EthAddr1 []*big.Int `json:"ethAddr1"` // ethCommon.Address, len: [nTx]
Siblings1 [][]*big.Int `json:"siblings1"` // big.Int, len: [nTx][nLevels + 1]
// Required for inserts and deletes, values of the CircomProcessorProof (smt insert proof)
IsOld0_1 []*big.Int `json:"isOld0_1"` // bool, len: [nTx]
OldKey1 []*big.Int `json:"oldKey1"` // uint64 (max 40 bits), len: [nTx]
OldValue1 []*big.Int `json:"oldValue1"` // Hash, len: [nTx]
// state 2, value of the receiver (to) account leaf
// if Tx is an Exit, state 2 is used for the Exit Merkle Proof
TokenID2 []*big.Int `json:"tokenID2"` // uint32, len: [nTx]
Nonce2 []*big.Int `json:"nonce2"` // uint64 (max 40 bits), len: [nTx]
Sign2 []*big.Int `json:"sign2"` // bool, len: [nTx]
Ay2 []*big.Int `json:"ay2"` // big.Int, len: [nTx]
Balance2 []*big.Int `json:"balance2"` // big.Int (max 192 bits), len: [nTx]
EthAddr2 []*big.Int `json:"ethAddr2"` // ethCommon.Address, len: [nTx]
Siblings2 [][]*big.Int `json:"siblings2"` // big.Int, len: [nTx][nLevels + 1]
// newExit determines if an exit transaction has to create a new leaf in the exit tree
NewExit []*big.Int `json:"newExit"` // bool, len: [nTx]
// Required for inserts and deletes, values of the CircomProcessorProof (smt insert proof)
IsOld0_2 []*big.Int `json:"isOld0_2"` // bool, len: [nTx]
OldKey2 []*big.Int `json:"oldKey2"` // uint64 (max 40 bits), len: [nTx]
OldValue2 []*big.Int `json:"oldValue2"` // Hash, len: [nTx]
// state 3, value of the account leaf receiver of the Fees
// fee tx
// State fees
TokenID3 []*big.Int `json:"tokenID3"` // uint32, len: [maxFeeIdxs]
Nonce3 []*big.Int `json:"nonce3"` // uint64 (max 40 bits), len: [maxFeeIdxs]
Sign3 []*big.Int `json:"sign3"` // bool, len: [maxFeeIdxs]
Ay3 []*big.Int `json:"ay3"` // big.Int, len: [maxFeeIdxs]
Balance3 []*big.Int `json:"balance3"` // big.Int (max 192 bits), len: [maxFeeIdxs]
EthAddr3 []*big.Int `json:"ethAddr3"` // ethCommon.Address, len: [maxFeeIdxs]
Siblings3 [][]*big.Int `json:"siblings3"` // Hash, len: [maxFeeIdxs][nLevels + 1]
//
// Intermediate States
//
// Intermediate States to parallelize witness computation
// Note: the Intermediate States (IS) of the last transaction does not
// exist. Meaning that transaction 3 (4th) will fill the parameters
// FromIdx[3] and ISOnChain[3], but last transaction (nTx-1) will fill
// FromIdx[nTx-1] but will not fill ISOnChain. That's why IS have
// length of nTx-1, while the other parameters have length of nTx.
// Last transaction does not need intermediate state since its output
// will not be used.
// decode-tx
// ISOnChain indicates if tx is L1 (true (1)) or L2 (false (0))
ISOnChain []*big.Int `json:"imOnChain"` // bool, len: [nTx - 1]
// ISOutIdx current index account for each Tx
// Contains the index of the created account in case that the tx is of
// account creation type.
ISOutIdx []*big.Int `json:"imOutIdx"` // uint64 (max nLevels bits), len: [nTx - 1]
// rollup-tx
// ISStateRoot root at the moment of the Tx (once processed), the state
// root value once the Tx is processed into the state tree
ISStateRoot []*big.Int `json:"imStateRoot"` // Hash, len: [nTx - 1]
// ISExitTree root at the moment (once processed) of the Tx the value
// once the Tx is processed into the exit tree
ISExitRoot []*big.Int `json:"imExitRoot"` // Hash, len: [nTx - 1]
// ISAccFeeOut accumulated fees once the Tx is processed. Contains the
// array of FeeAccount Balances at each moment of each Tx processed.
ISAccFeeOut [][]*big.Int `json:"imAccFeeOut"` // big.Int, len: [nTx - 1][maxFeeIdxs]
// fee-tx:
// ISStateRootFee root at the moment of the Tx (once processed), the
// state root value once the Tx is processed into the state tree
ISStateRootFee []*big.Int `json:"imStateRootFee"` // Hash, len: [maxFeeIdxs - 1]
// ISInitStateRootFee state root once all L1-L2 tx are processed
// (before computing the fees-tx)
ISInitStateRootFee *big.Int `json:"imInitStateRootFee"` // Hash
// ISFinalAccFee final accumulated fees (before computing the fees-tx).
// Contains the final values of the ISAccFeeOut parameter
ISFinalAccFee []*big.Int `json:"imFinalAccFee"` // big.Int, len: [maxFeeIdxs - 1]
}
func bigIntsToStrings(v interface{}) interface{} {
switch c := v.(type) {
case *big.Int:
return c.String()
case []*big.Int:
r := make([]interface{}, len(c))
for i := range c {
r[i] = bigIntsToStrings(c[i])
}
return r
case [256]*big.Int:
r := make([]interface{}, len(c))
for i := range c {
r[i] = bigIntsToStrings(c[i])
}
return r
case [][]*big.Int:
r := make([]interface{}, len(c))
for i := range c {
r[i] = bigIntsToStrings(c[i])
}
return r
case [][256]*big.Int:
r := make([]interface{}, len(c))
for i := range c {
r[i] = bigIntsToStrings(c[i])
}
return r
case map[string]interface{}:
// avoid printing a warning when there is a struct type
default:
log.Warnf("bigIntsToStrings unexpected type: %T\n", v)
}
return nil
}
// MarshalJSON implements the json marshaler for ZKInputs
func (z ZKInputs) MarshalJSON() ([]byte, error) {
var m map[string]interface{}
dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
TagName: "json",
Result: &m,
})
if err != nil {
return nil, tracerr.Wrap(err)
}
err = dec.Decode(z)
if err != nil {
return nil, tracerr.Wrap(err)
}
for k, v := range m {
m[k] = bigIntsToStrings(v)
}
return json.Marshal(m)
}
// NewZKInputs returns a pointer to an initialized struct of ZKInputs
func NewZKInputs(nTx, maxL1Tx, maxTx, maxFeeIdxs, nLevels uint32, currentNumBatch *big.Int) *ZKInputs {
zki := &ZKInputs{}
zki.Metadata.NTx = nTx
zki.Metadata.MaxFeeIdxs = maxFeeIdxs
zki.Metadata.MaxLevels = uint32(48) //nolint:gomnd
zki.Metadata.NLevels = nLevels
zki.Metadata.MaxL1Tx = maxL1Tx
zki.Metadata.MaxTx = maxTx
// General
zki.CurrentNumBatch = currentNumBatch
zki.OldLastIdx = big.NewInt(0)
zki.OldStateRoot = big.NewInt(0)
zki.GlobalChainID = big.NewInt(0) // TODO pass by parameter
zki.FeeIdxs = newSlice(maxFeeIdxs)
zki.FeePlanTokens = newSlice(maxFeeIdxs)
// Txs
zki.TxCompressedData = newSlice(nTx)
zki.TxCompressedDataV2 = newSlice(nTx)
zki.MaxNumBatch = newSlice(nTx)
zki.FromIdx = newSlice(nTx)
zki.AuxFromIdx = newSlice(nTx)
zki.ToIdx = newSlice(nTx)
zki.AuxToIdx = newSlice(nTx)
zki.ToBJJAy = newSlice(nTx)
zki.ToEthAddr = newSlice(nTx)
zki.OnChain = newSlice(nTx)
zki.NewAccount = newSlice(nTx)
// L1
zki.DepositAmountF = newSlice(nTx)
zki.FromEthAddr = newSlice(nTx)
zki.FromBJJCompressed = make([][256]*big.Int, nTx)
for i := 0; i < len(zki.FromBJJCompressed); i++ {
// zki.FromBJJCompressed[i] = newSlice(256)
for j := 0; j < 256; j++ {
zki.FromBJJCompressed[i][j] = big.NewInt(0)
}
}
// L2
zki.RqOffset = newSlice(nTx)
zki.RqTxCompressedDataV2 = newSlice(nTx)
zki.RqToEthAddr = newSlice(nTx)
zki.RqToBJJAy = newSlice(nTx)
zki.S = newSlice(nTx)
zki.R8x = newSlice(nTx)
zki.R8y = newSlice(nTx)
// State MerkleTree Leafs transitions
zki.TokenID1 = newSlice(nTx)
zki.Nonce1 = newSlice(nTx)
zki.Sign1 = newSlice(nTx)
zki.Ay1 = newSlice(nTx)
zki.Balance1 = newSlice(nTx)
zki.EthAddr1 = newSlice(nTx)
zki.Siblings1 = make([][]*big.Int, nTx)
for i := 0; i < len(zki.Siblings1); i++ {
zki.Siblings1[i] = newSlice(nLevels + 1)
}
zki.IsOld0_1 = newSlice(nTx)
zki.OldKey1 = newSlice(nTx)
zki.OldValue1 = newSlice(nTx)
zki.TokenID2 = newSlice(nTx)
zki.Nonce2 = newSlice(nTx)
zki.Sign2 = newSlice(nTx)
zki.Ay2 = newSlice(nTx)
zki.Balance2 = newSlice(nTx)
zki.EthAddr2 = newSlice(nTx)
zki.Siblings2 = make([][]*big.Int, nTx)
for i := 0; i < len(zki.Siblings2); i++ {
zki.Siblings2[i] = newSlice(nLevels + 1)
}
zki.NewExit = newSlice(nTx)
zki.IsOld0_2 = newSlice(nTx)
zki.OldKey2 = newSlice(nTx)
zki.OldValue2 = newSlice(nTx)
zki.TokenID3 = newSlice(maxFeeIdxs)
zki.Nonce3 = newSlice(maxFeeIdxs)
zki.Sign3 = newSlice(maxFeeIdxs)
zki.Ay3 = newSlice(maxFeeIdxs)
zki.Balance3 = newSlice(maxFeeIdxs)
zki.EthAddr3 = newSlice(maxFeeIdxs)
zki.Siblings3 = make([][]*big.Int, maxFeeIdxs)
for i := 0; i < len(zki.Siblings3); i++ {
zki.Siblings3[i] = newSlice(nLevels + 1)
}
// Intermediate States
zki.ISOnChain = newSlice(nTx - 1)
zki.ISOutIdx = newSlice(nTx - 1)
zki.ISStateRoot = newSlice(nTx - 1)
zki.ISExitRoot = newSlice(nTx - 1)
zki.ISAccFeeOut = make([][]*big.Int, nTx-1)
for i := 0; i < len(zki.ISAccFeeOut); i++ {
zki.ISAccFeeOut[i] = newSlice(maxFeeIdxs)
}
zki.ISStateRootFee = newSlice(maxFeeIdxs - 1)
zki.ISInitStateRootFee = big.NewInt(0)
zki.ISFinalAccFee = newSlice(maxFeeIdxs - 1)
return zki
}
// newSlice returns a []*big.Int slice of length n with values initialized at
// 0.
// Is used to initialize all *big.Ints of the ZKInputs data structure, so when
// the transactions are processed and the ZKInputs filled, there is no need to
// set all the elements, and if a transaction does not use a parameter, can be
// leaved as it is in the ZKInputs, as will be 0, so later when using the
// ZKInputs to generate the zkSnark proof there is no 'nil'/'null' values.
func newSlice(n uint32) []*big.Int {
s := make([]*big.Int, n)
for i := 0; i < len(s); i++ {
s[i] = big.NewInt(0)
}
return s
}
// HashGlobalData returns the HashGlobalData
func (z ZKInputs) HashGlobalData() (*big.Int, error) {
b, err := z.ToHashGlobalData()
if err != nil {
return nil, tracerr.Wrap(err)
}
h := sha256.New()
_, err = h.Write(b)
if err != nil {
return nil, tracerr.Wrap(err)
}
r := new(big.Int).SetBytes(h.Sum(nil))
v := r.Mod(r, cryptoConstants.Q)
return v, nil
}
// ToHashGlobalData returns the data to be hashed in the method HashGlobalData
func (z ZKInputs) ToHashGlobalData() ([]byte, error) {
var b []byte
bytesMaxLevels := int(z.Metadata.MaxLevels / 8) //nolint:gomnd
bytesNLevels := int(z.Metadata.NLevels / 8) //nolint:gomnd
// [MAX_NLEVELS bits] oldLastIdx
oldLastIdx := make([]byte, bytesMaxLevels)
copy(oldLastIdx, z.OldLastIdx.Bytes())
b = append(b, SwapEndianness(oldLastIdx)...)
// [MAX_NLEVELS bits] newLastIdx
newLastIdx := make([]byte, bytesMaxLevels)
newLastIdxBytes, err := z.Metadata.NewLastIdxRaw.Bytes()
if err != nil {
return nil, tracerr.Wrap(err)
}
copy(newLastIdx, newLastIdxBytes[len(newLastIdxBytes)-bytesMaxLevels:])
b = append(b, newLastIdx...)
// [256 bits] oldStRoot
oldStateRoot := make([]byte, 32)
copy(oldStateRoot, z.OldStateRoot.Bytes())
b = append(b, oldStateRoot...)
// [256 bits] newStateRoot
newStateRoot := make([]byte, 32)
copy(newStateRoot, z.Metadata.NewStateRootRaw.Bytes())
b = append(b, newStateRoot...)
// [256 bits] newExitRoot
newExitRoot := make([]byte, 32)
copy(newExitRoot, z.Metadata.NewExitRootRaw.Bytes())
b = append(b, newExitRoot...)
// [MAX_L1_TX * (2 * MAX_NLEVELS + 480) bits] L1TxsData
l1TxDataLen := (2*z.Metadata.MaxLevels + 480)
l1TxsDataLen := (z.Metadata.MaxL1Tx * l1TxDataLen)
l1TxsData := make([]byte, l1TxsDataLen/8) //nolint:gomnd
for i := 0; i < len(z.Metadata.L1TxsData); i++ {
dataLen := int(l1TxDataLen) / 8 //nolint:gomnd
pos0 := i * dataLen
pos1 := i*dataLen + dataLen
copy(l1TxsData[pos0:pos1], z.Metadata.L1TxsData[i])
}
b = append(b, l1TxsData...)
var l1TxsDataAvailability []byte
for i := 0; i < len(z.Metadata.L1TxsDataAvailability); i++ {
l1TxsDataAvailability = append(l1TxsDataAvailability, z.Metadata.L1TxsDataAvailability[i]...)
}
b = append(b, l1TxsDataAvailability...)
// [MAX_TX*(2*NLevels + 24) bits] L2TxsData
var l2TxsData []byte
l2TxDataLen := 2*z.Metadata.NLevels + 24 //nolint:gomnd
l2TxsDataLen := (z.Metadata.MaxTx * l2TxDataLen)
expectedL2TxsDataLen := l2TxsDataLen / 8 //nolint:gomnd
for i := 0; i < len(z.Metadata.L2TxsData); i++ {
l2TxsData = append(l2TxsData, z.Metadata.L2TxsData[i]...)
}
if len(l2TxsData) > int(expectedL2TxsDataLen) {
return nil, tracerr.Wrap(fmt.Errorf("len(l2TxsData): %d, expected: %d", len(l2TxsData), expectedL2TxsDataLen))
}
b = append(b, l2TxsData...)
l2TxsPadding := make([]byte, (int(z.Metadata.MaxTx)-len(z.Metadata.L1TxsDataAvailability)-len(z.Metadata.L2TxsData))*int(l2TxDataLen)/8) //nolint:gomnd
b = append(b, l2TxsPadding...)
// [NLevels * MAX_TOKENS_FEE bits] feeTxsData
for i := 0; i < len(z.FeeIdxs); i++ {
feeIdx := make([]byte, bytesNLevels) //nolint:gomnd
feeIdxBytes := z.FeeIdxs[i].Bytes()
copy(feeIdx[len(feeIdx)-len(feeIdxBytes):], feeIdxBytes[:])
b = append(b, feeIdx...)
}
// [16 bits] chainID
var chainID [2]byte
binary.BigEndian.PutUint16(chainID[:], z.Metadata.ChainID)
b = append(b, chainID[:]...)
// [32 bits] currentNumBatch
currNumBatchBytes := z.CurrentNumBatch.Bytes()
var currNumBatch [4]byte
copy(currNumBatch[4-len(currNumBatchBytes):], currNumBatchBytes)
b = append(b, currNumBatch[:]...)
return b, nil
}