forked from 0xProject/0x-mesh
-
Notifications
You must be signed in to change notification settings - Fork 1
/
order.go
632 lines (579 loc) · 20 KB
/
order.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
package zeroex
import (
"encoding/json"
"errors"
"fmt"
"math/big"
"strings"
"time"
"github.com/0xProject/0x-mesh/ethereum/signer"
"github.com/0xProject/0x-mesh/ethereum/wrappers"
"github.com/0xProject/0x-mesh/zeroex/orderwatch/decoder"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
gethsigner "github.com/ethereum/go-ethereum/signer/core"
"golang.org/x/crypto/sha3"
)
// Order represents an unsigned 0x order
type Order struct {
MakerAddress common.Address `json:"makerAddress"`
MakerAssetData []byte `json:"makerAssetData"`
MakerAssetAmount *big.Int `json:"makerAssetAmount"`
MakerFee *big.Int `json:"makerFee"`
TakerAddress common.Address `json:"takerAddress"`
TakerAssetData []byte `json:"takerAssetData"`
TakerAssetAmount *big.Int `json:"takerAssetAmount"`
TakerFee *big.Int `json:"takerFee"`
SenderAddress common.Address `json:"senderAddress"`
ExchangeAddress common.Address `json:"exchangeAddress"`
FeeRecipientAddress common.Address `json:"feeRecipientAddress"`
ExpirationTimeSeconds *big.Int `json:"expirationTimeSeconds"`
Salt *big.Int `json:"salt"`
// Cache hash for performance
hash *common.Hash
}
// SignedOrder represents a signed 0x order
type SignedOrder struct {
Order
Signature []byte `json:"signature"`
}
// SignatureType represents the type of 0x signature encountered
type SignatureType uint8
// SignatureType values
const (
IllegalSignature SignatureType = iota
InvalidSignature
EIP712Signature
EthSignSignature
WalletSignature
ValidatorSignature
PreSignedSignature
NSignatureTypesSignature
)
// OrderStatus represents the status of an order as returned from the 0x smart contracts
// as part of OrderInfo
type OrderStatus uint8
// OrderStatus values
const (
OSInvalid OrderStatus = iota
OSInvalidMakerAssetAmount
OSInvalidTakerAssetAmount
OSFillable
OSExpired
OSFullyFilled
OSCancelled
OSSignatureInvalid
OSInvalidMakerAssetData
OSInvalidTakerAssetData
)
// ContractEvent is an event emitted by a smart contract
type ContractEvent struct {
BlockHash common.Hash
TxHash common.Hash
TxIndex uint
LogIndex uint
IsRemoved bool
Address common.Address
Kind string
Parameters interface{}
}
type contractEventJSON struct {
BlockHash common.Hash
TxHash common.Hash
TxIndex uint
LogIndex uint
IsRemoved bool
Address common.Address
Kind string
Parameters json.RawMessage
}
// MarshalJSON implements a custom JSON marshaller for the ContractEvent type
func (c ContractEvent) MarshalJSON() ([]byte, error) {
m := map[string]interface{}{
"blockHash": c.BlockHash.Hex(),
"txHash": c.TxHash.Hex(),
"txIndex": c.TxIndex,
"logIndex": c.LogIndex,
"isRemoved": c.IsRemoved,
"address": c.Address,
"kind": c.Kind,
"parameters": c.Parameters,
}
return json.Marshal(m)
}
// OrderEvent is the order event emitted by Mesh nodes on the "orders" topic
// when calling JSON-RPC method `mesh_subscribe`
type OrderEvent struct {
// Timestamp is an order event timestamp that can be used for bookkeeping purposes.
// If the OrderEvent represents a Mesh-specific event (e.g., ADDED, STOPPED_WATCHING),
// the timestamp is when the event was generated. If the event was generated after
// re-validating an order at the latest block height (e.g., FILLED, UNFUNDED, CANCELED),
// then it is set to the latest block timestamp at which the order was re-validated.
Timestamp time.Time `json:"timestamp"`
// OrderHash is the EIP712 hash of the 0x order
OrderHash common.Hash `json:"orderHash"`
// SignedOrder is the signed 0x order struct
SignedOrder *SignedOrder `json:"signedOrder"`
// EndState is the end state of this order at the time this event was generated
EndState OrderEventEndState `json:"endState"`
// FillableTakerAssetAmount is the amount for which this order is still fillable
FillableTakerAssetAmount *big.Int `json:"fillableTakerAssetAmount"`
// ContractEvents contains all the contract events that triggered this orders re-evaluation.
// They did not all necessarily cause the orders state change itself, only it's re-evaluation.
// Since it's state _did_ change, at least one of them did cause the actual state change.
ContractEvents []*ContractEvent `json:"contractEvents"`
}
type orderEventJSON struct {
Timestamp time.Time `json:"timestamp"`
OrderHash string `json:"orderHash"`
SignedOrder *SignedOrder `json:"signedOrder"`
EndState string `json:"endState"`
FillableTakerAssetAmount string `json:"fillableTakerAssetAmount"`
ContractEvents []*contractEventJSON `json:"contractEvents"`
}
// MarshalJSON implements a custom JSON marshaller for the OrderEvent type
func (o OrderEvent) MarshalJSON() ([]byte, error) {
return json.Marshal(map[string]interface{}{
"timestamp": o.Timestamp,
"orderHash": o.OrderHash.Hex(),
"signedOrder": o.SignedOrder,
"endState": o.EndState,
"fillableTakerAssetAmount": o.FillableTakerAssetAmount.String(),
"contractEvents": o.ContractEvents,
})
}
// UnmarshalJSON implements a custom JSON unmarshaller for the OrderEvent type
func (o *OrderEvent) UnmarshalJSON(data []byte) error {
var orderEventJSON orderEventJSON
err := json.Unmarshal(data, &orderEventJSON)
if err != nil {
return err
}
return o.fromOrderEventJSON(orderEventJSON)
}
func (o *OrderEvent) fromOrderEventJSON(orderEventJSON orderEventJSON) error {
o.Timestamp = orderEventJSON.Timestamp
o.OrderHash = common.HexToHash(orderEventJSON.OrderHash)
o.SignedOrder = orderEventJSON.SignedOrder
o.EndState = OrderEventEndState(orderEventJSON.EndState)
var ok bool
o.FillableTakerAssetAmount, ok = math.ParseBig256(orderEventJSON.FillableTakerAssetAmount)
if !ok {
return errors.New("Invalid uint256 number encountered for FillableTakerAssetAmount")
}
o.ContractEvents = make([]*ContractEvent, len(orderEventJSON.ContractEvents))
for i, eventJSON := range orderEventJSON.ContractEvents {
contractEvent, err := unmarshalContractEvent(eventJSON)
if err != nil {
return err
}
o.ContractEvents[i] = contractEvent
}
return nil
}
func unmarshalContractEvent(eventJSON *contractEventJSON) (*ContractEvent, error) {
event := &ContractEvent{
BlockHash: eventJSON.BlockHash,
TxHash: eventJSON.TxHash,
TxIndex: eventJSON.TxIndex,
LogIndex: eventJSON.LogIndex,
IsRemoved: eventJSON.IsRemoved,
Address: eventJSON.Address,
Kind: eventJSON.Kind,
}
switch eventJSON.Kind {
case "ERC20TransferEvent":
var parameters decoder.ERC20TransferEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ERC20ApprovalEvent":
var parameters decoder.ERC20ApprovalEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ERC721TransferEvent":
var parameters decoder.ERC721TransferEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ERC721ApprovalEvent":
var parameters decoder.ERC721ApprovalEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ERC721ApprovalForAllEvent":
var parameters decoder.ERC721ApprovalForAllEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ERC1155TransferSingleEvent":
var parameters decoder.ERC1155TransferSingleEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ERC1155TransferBatchEvent":
var parameters decoder.ERC1155TransferBatchEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ERC1155ApprovalForAllEvent":
var parameters decoder.ERC1155ApprovalForAllEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "WethWithdrawalEvent":
var parameters decoder.WethWithdrawalEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "WethDepositEvent":
var parameters decoder.WethDepositEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ExchangeFillEvent":
var parameters decoder.ExchangeFillEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ExchangeCancelEvent":
var parameters decoder.ExchangeCancelEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
case "ExchangeCancelUpToEvent":
var parameters decoder.ExchangeCancelUpToEvent
if err := json.Unmarshal(eventJSON.Parameters, ¶meters); err != nil {
return nil, err
}
event.Parameters = parameters
default:
return nil, fmt.Errorf("unknown event kind: %s", eventJSON.Kind)
}
return event, nil
}
// OrderEventEndState enumerates all the possible order event types. An OrderEventEndState describes the
// end state of a 0x order after revalidation
type OrderEventEndState string
// OrderEventEndState values
const (
// ESInvalid is an event that is never emitted. It is here to discern between a declared but uninitialized OrderEventEndState
ESInvalid = OrderEventEndState("INVALID")
// ESOrderAdded means an order was successfully added to the Mesh node
ESOrderAdded = OrderEventEndState("ADDED")
// ESOrderFilled means an order was filled for a partial amount
ESOrderFilled = OrderEventEndState("FILLED")
// ESOrderFullyFilled means an order was fully filled such that it's remaining fillableTakerAssetAmount is 0
ESOrderFullyFilled = OrderEventEndState("FULLY_FILLED")
// ESOrderCancelled means an order was cancelled on-chain
ESOrderCancelled = OrderEventEndState("CANCELLED")
// ESOrderExpired means an order expired according to the latest block timestamp
ESOrderExpired = OrderEventEndState("EXPIRED")
// ESOrderUnexpired means an order is no longer expired. This can happen if a block re-org causes the latest
// block timestamp to decline below the order's expirationTimestamp (rare and usually short-lived)
ESOrderUnexpired = OrderEventEndState("UNEXPIRED")
// ESOrderBecameUnfunded means an order has become unfunded. This happens if the maker transfers the balance /
// changes their allowance backing an order
ESOrderBecameUnfunded = OrderEventEndState("UNFUNDED")
// ESOrderFillabilityIncreased means the fillability of an order has increased. Fillability for an order can
// increase if a previously processed fill event gets reverted, or if a maker tops up their balance/allowance
// backing an order
ESOrderFillabilityIncreased = OrderEventEndState("FILLABILITY_INCREASED")
// ESStoppedWatching means an order is potentially still valid but was removed for a different reason (e.g.
// the database is full or the peer that sent the order was misbehaving). The order will no longer be watched
// and no further events for this order will be emitted. In some cases, the order may be re-added in the
// future.
ESStoppedWatching = OrderEventEndState("STOPPED_WATCHING")
)
var eip712OrderTypes = gethsigner.Types{
"EIP712Domain": {
{
Name: "name",
Type: "string",
},
{
Name: "version",
Type: "string",
},
{
Name: "verifyingContract",
Type: "address",
},
},
"Order": {
{
Name: "makerAddress",
Type: "address",
},
{
Name: "takerAddress",
Type: "address",
},
{
Name: "feeRecipientAddress",
Type: "address",
},
{
Name: "senderAddress",
Type: "address",
},
{
Name: "makerAssetAmount",
Type: "uint256",
},
{
Name: "takerAssetAmount",
Type: "uint256",
},
{
Name: "makerFee",
Type: "uint256",
},
{
Name: "takerFee",
Type: "uint256",
},
{
Name: "expirationTimeSeconds",
Type: "uint256",
},
{
Name: "salt",
Type: "uint256",
},
{
Name: "makerAssetData",
Type: "bytes",
},
{
Name: "takerAssetData",
Type: "bytes",
},
},
}
// Resets the cached order hash. Usually only required for testing.
func (o *Order) ResetHash() {
o.hash = nil
}
// ComputeOrderHash computes a 0x order hash
func (o *Order) ComputeOrderHash() (common.Hash, error) {
if o.hash != nil {
return *o.hash, nil
}
var domain = gethsigner.TypedDataDomain{
Name: "0x Protocol",
Version: "2",
VerifyingContract: o.ExchangeAddress.Hex(),
}
var message = map[string]interface{}{
"makerAddress": o.MakerAddress.Hex(),
"takerAddress": o.TakerAddress.Hex(),
"senderAddress": o.SenderAddress.Hex(),
"feeRecipientAddress": o.FeeRecipientAddress.Hex(),
"makerAssetData": o.MakerAssetData,
"takerAssetData": o.TakerAssetData,
"salt": o.Salt.String(),
"makerFee": o.MakerFee.String(),
"takerFee": o.TakerFee.String(),
"makerAssetAmount": o.MakerAssetAmount.String(),
"takerAssetAmount": o.TakerAssetAmount.String(),
"expirationTimeSeconds": o.ExpirationTimeSeconds.String(),
}
var typedData = gethsigner.TypedData{
Types: eip712OrderTypes,
PrimaryType: "Order",
Domain: domain,
Message: message,
}
domainSeparator, err := typedData.HashStruct("EIP712Domain", typedData.Domain.Map())
if err != nil {
return common.Hash{}, err
}
typedDataHash, err := typedData.HashStruct(typedData.PrimaryType, typedData.Message)
if err != nil {
return common.Hash{}, err
}
rawData := []byte(fmt.Sprintf("\x19\x01%s%s", string(domainSeparator), string(typedDataHash)))
hashBytes := keccak256(rawData)
hash := common.BytesToHash(hashBytes)
o.hash = &hash
return hash, nil
}
// SignOrder signs the 0x order with the supplied Signer
func SignOrder(signer signer.Signer, order *Order) (*SignedOrder, error) {
if order == nil {
return nil, errors.New("cannot sign nil order")
}
orderHash, err := order.ComputeOrderHash()
if err != nil {
return nil, err
}
ecSignature, err := signer.EthSign(orderHash.Bytes(), order.MakerAddress)
if err != nil {
return nil, err
}
// Generate 0x EthSign Signature (append the signature type byte)
signature := make([]byte, 66)
signature[0] = ecSignature.V
copy(signature[1:33], ecSignature.R[:])
copy(signature[33:65], ecSignature.S[:])
signature[65] = byte(EthSignSignature)
signedOrder := &SignedOrder{
Order: *order,
Signature: signature,
}
return signedOrder, nil
}
// SignTestOrder signs the 0x order with the local test signer
func SignTestOrder(order *Order) (*SignedOrder, error) {
testSigner := signer.NewTestSigner()
signedOrder, err := SignOrder(testSigner, order)
if err != nil {
return nil, err
}
return signedOrder, nil
}
// ConvertToOrderWithoutExchangeAddress re-formats a SignedOrder into the format expected by the 0x
// smart contracts.
func (s *SignedOrder) ConvertToOrderWithoutExchangeAddress() wrappers.OrderWithoutExchangeAddress {
orderWithoutExchangeAddress := wrappers.OrderWithoutExchangeAddress{
MakerAddress: s.MakerAddress,
TakerAddress: s.TakerAddress,
FeeRecipientAddress: s.FeeRecipientAddress,
SenderAddress: s.SenderAddress,
MakerAssetAmount: s.MakerAssetAmount,
TakerAssetAmount: s.TakerAssetAmount,
MakerFee: s.MakerFee,
TakerFee: s.TakerFee,
ExpirationTimeSeconds: s.ExpirationTimeSeconds,
Salt: s.Salt,
MakerAssetData: s.MakerAssetData,
TakerAssetData: s.TakerAssetData,
}
return orderWithoutExchangeAddress
}
// SignedOrderJSON is an unmodified JSON representation of a SignedOrder
type SignedOrderJSON struct {
MakerAddress string `json:"makerAddress"`
MakerAssetData string `json:"makerAssetData"`
MakerAssetAmount string `json:"makerAssetAmount"`
MakerFee string `json:"makerFee"`
TakerAddress string `json:"takerAddress"`
TakerAssetData string `json:"takerAssetData"`
TakerAssetAmount string `json:"takerAssetAmount"`
TakerFee string `json:"takerFee"`
SenderAddress string `json:"senderAddress"`
ExchangeAddress string `json:"exchangeAddress"`
FeeRecipientAddress string `json:"feeRecipientAddress"`
ExpirationTimeSeconds string `json:"expirationTimeSeconds"`
Salt string `json:"salt"`
Signature string `json:"signature"`
}
// MarshalJSON implements a custom JSON marshaller for the SignedOrder type
func (s SignedOrder) MarshalJSON() ([]byte, error) {
makerAssetData := ""
if len(s.MakerAssetData) != 0 {
makerAssetData = fmt.Sprintf("0x%s", common.Bytes2Hex(s.MakerAssetData))
}
takerAssetData := ""
if len(s.TakerAssetData) != 0 {
takerAssetData = fmt.Sprintf("0x%s", common.Bytes2Hex(s.TakerAssetData))
}
signature := ""
if len(s.Signature) != 0 {
signature = fmt.Sprintf("0x%s", common.Bytes2Hex(s.Signature))
}
signedOrderBytes, err := json.Marshal(SignedOrderJSON{
MakerAddress: strings.ToLower(s.MakerAddress.Hex()),
MakerAssetData: makerAssetData,
MakerAssetAmount: s.MakerAssetAmount.String(),
MakerFee: s.MakerFee.String(),
TakerAddress: strings.ToLower(s.TakerAddress.Hex()),
TakerAssetData: takerAssetData,
TakerAssetAmount: s.TakerAssetAmount.String(),
TakerFee: s.TakerFee.String(),
SenderAddress: strings.ToLower(s.SenderAddress.Hex()),
ExchangeAddress: strings.ToLower(s.ExchangeAddress.Hex()),
FeeRecipientAddress: strings.ToLower(s.FeeRecipientAddress.Hex()),
ExpirationTimeSeconds: s.ExpirationTimeSeconds.String(),
Salt: s.Salt.String(),
Signature: signature,
})
return signedOrderBytes, err
}
const addressHexLength = 42
// UnmarshalJSON implements a custom JSON unmarshaller for the SignedOrder type
func (s *SignedOrder) UnmarshalJSON(data []byte) error {
var signedOrderJSON SignedOrderJSON
err := json.Unmarshal(data, &signedOrderJSON)
if err != nil {
return err
}
s.MakerAddress = common.HexToAddress(signedOrderJSON.MakerAddress)
s.MakerAssetData = common.FromHex(signedOrderJSON.MakerAssetData)
var ok bool
if signedOrderJSON.MakerAssetAmount != "" {
s.MakerAssetAmount, ok = math.ParseBig256(signedOrderJSON.MakerAssetAmount)
if !ok {
s.MakerAssetAmount = nil
}
}
if signedOrderJSON.MakerFee != "" {
s.MakerFee, ok = math.ParseBig256(signedOrderJSON.MakerFee)
if !ok {
s.MakerFee = nil
}
}
s.TakerAddress = common.HexToAddress(signedOrderJSON.TakerAddress)
s.TakerAssetData = common.FromHex(signedOrderJSON.TakerAssetData)
if signedOrderJSON.TakerAssetAmount != "" {
s.TakerAssetAmount, ok = math.ParseBig256(signedOrderJSON.TakerAssetAmount)
if !ok {
s.TakerAssetAmount = nil
}
}
if signedOrderJSON.TakerFee != "" {
s.TakerFee, ok = math.ParseBig256(signedOrderJSON.TakerFee)
if !ok {
s.TakerFee = nil
}
}
s.SenderAddress = common.HexToAddress(signedOrderJSON.SenderAddress)
s.ExchangeAddress = common.HexToAddress(signedOrderJSON.ExchangeAddress)
s.FeeRecipientAddress = common.HexToAddress(signedOrderJSON.FeeRecipientAddress)
if signedOrderJSON.ExpirationTimeSeconds != "" {
s.ExpirationTimeSeconds, ok = math.ParseBig256(signedOrderJSON.ExpirationTimeSeconds)
if !ok {
s.ExpirationTimeSeconds = nil
}
}
if signedOrderJSON.Salt != "" {
s.Salt, ok = math.ParseBig256(signedOrderJSON.Salt)
if !ok {
s.Salt = nil
}
}
s.Signature = common.FromHex(signedOrderJSON.Signature)
return nil
}
// keccak256 calculates and returns the Keccak256 hash of the input data.
func keccak256(data ...[]byte) []byte {
d := sha3.NewLegacyKeccak256()
for _, b := range data {
_, _ = d.Write(b)
}
return d.Sum(nil)
}