protocol/validation/validation_test.go

   1 package validation
   2
   3 import (
   4         "blockchain/consensus"
   5         "fmt"
   6         "math"
   7         "testing"
   8         "time"
   9
  10         "github.com/bytom/crypto/sha3pool"
  11         "github.com/bytom/errors"
  12         "github.com/bytom/protocol/bc"
  13         "github.com/bytom/protocol/bc/legacy"
  14         "github.com/bytom/protocol/vm"
  15         "github.com/bytom/testutil"
  16
  17         "github.com/davecgh/go-spew/spew"
  18         "github.com/golang/protobuf/proto"
  19 )
  20
  21 func init() {
  22         spew.Config.DisableMethods = true
  23 }
  24
  25 func TestGasStatus(t *testing.T) {
  26         cases := []struct {
  27                 input  *gasState
  28                 output *gasState
  29                 f      func(*gasState) error
  30                 err    error
  31         }{
  32                 {
  33                         input: &gasState{
  34                                 gasLeft:  10000,
  35                                 gasUsed:  0,
  36                                 BTMValue: 0,
  37                         },
  38                         output: &gasState{
  39                                 gasLeft:  10000 / gasRate,
  40                                 gasUsed:  0,
  41                                 BTMValue: 10000,
  42                         },
  43                         f: func(input *gasState) error {
  44                                 return input.setGas(10000)
  45                         },
  46                         err: nil,
  47                 },
  48                 {
  49                         input: &gasState{
  50                                 gasLeft:  10000,
  51                                 gasUsed:  0,
  52                                 BTMValue: 0,
  53                         },
  54                         output: &gasState{
  55                                 gasLeft:  10000,
  56                                 gasUsed:  0,
  57                                 BTMValue: 0,
  58                         },
  59                         f: func(input *gasState) error {
  60                                 return input.setGas(-10000)
  61                         },
  62                         err: errGasCalculate,
  63                 },
  64                 {
  65                         input: &gasState{
  66                                 gasLeft:  defaultGasLimit,
  67                                 gasUsed:  0,
  68                                 BTMValue: 0,
  69                         },
  70                         output: &gasState{
  71                                 gasLeft:  defaultGasLimit,
  72                                 gasUsed:  0,
  73                                 BTMValue: 80000000000,
  74                         },
  75                         f: func(input *gasState) error {
  76                                 return input.setGas(80000000000)
  77                         },
  78                         err: nil,
  79                 },
  80                 {
  81                         input: &gasState{
  82                                 gasLeft:  10000,
  83                                 gasUsed:  0,
  84                                 BTMValue: 0,
  85                         },
  86                         output: &gasState{
  87                                 gasLeft:  10000,
  88                                 gasUsed:  0,
  89                                 BTMValue: 0,
  90                         },
  91                         f: func(input *gasState) error {
  92                                 return input.updateUsage(-1)
  93                         },
  94                         err: errGasCalculate,
  95                 },
  96                 {
  97                         input: &gasState{
  98                                 gasLeft:  10000,
  99                                 gasUsed:  0,
 100                                 BTMValue: 0,
 101                         },
 102                         output: &gasState{
 103                                 gasLeft:  9999,
 104                                 gasUsed:  1,
 105                                 BTMValue: 0,
 106                         },
 107                         f: func(input *gasState) error {
 108                                 return input.updateUsage(9999)
 109                         },
 110                         err: nil,
 111                 },
 112         }
 113
 114         for _, c := range cases {
 115                 err := c.f(c.input)
 116
 117                 if err != c.err {
 118                         t.Errorf("got error %s, want %s", err, c.err)
 119                 } else if *c.input != *c.output {
 120                         t.Errorf("got gasStatus %s, want %s;", c.input, c.output)
 121                 }
 122         }
 123 }
 124
 125 func TestTxValidation(t *testing.T) {
 126         var (
 127                 tx      *bc.Tx
 128                 vs      *validationState
 129                 fixture *txFixture
 130
 131                 // the mux from tx, pulled out for convenience
 132                 mux *bc.Mux
 133         )
 134
 135         cases := []struct {
 136                 desc string // description of the test case
 137                 f    func() // function to adjust tx, vs, and/or mux
 138                 err  error  // expected error
 139         }{
 140                 {
 141                         desc: "base case",
 142                 },
 143                 {
 144                         desc: "failing mux program",
 145                         f: func() {
 146                                 mux.Program.Code = []byte{byte(vm.OP_FALSE)}
 147                         },
 148                         err: vm.ErrFalseVMResult,
 149                 },
 150                 {
 151                         desc: "unbalanced mux amounts",
 152                         f: func() {
 153                                 mux.Sources[0].Value.Amount++
 154                                 iss := tx.Entries[*mux.Sources[0].Ref].(*bc.Issuance)
 155                                 iss.WitnessDestination.Value.Amount++
 156                         },
 157                         err: errUnbalanced,
 158                 },
 159                 {
 160                         desc: "overflowing mux source amounts",
 161                         f: func() {
 162                                 mux.Sources[0].Value.Amount = math.MaxInt64
 163                                 iss := tx.Entries[*mux.Sources[0].Ref].(*bc.Issuance)
 164                                 iss.WitnessDestination.Value.Amount = math.MaxInt64
 165                         },
 166                         err: errOverflow,
 167                 },
 168                 {
 169                         desc: "underflowing mux destination amounts",
 170                         f: func() {
 171                                 mux.WitnessDestinations[0].Value.Amount = math.MaxInt64
 172                                 out := tx.Entries[*mux.WitnessDestinations[0].Ref].(*bc.Output)
 173                                 out.Source.Value.Amount = math.MaxInt64
 174                                 mux.WitnessDestinations[1].Value.Amount = math.MaxInt64
 175                                 out = tx.Entries[*mux.WitnessDestinations[1].Ref].(*bc.Output)
 176                                 out.Source.Value.Amount = math.MaxInt64
 177                         },
 178                         err: errOverflow,
 179                 },
 180                 {
 181                         desc: "unbalanced mux assets",
 182                         f: func() {
 183                                 mux.Sources[1].Value.AssetId = newAssetID(255)
 184                                 sp := tx.Entries[*mux.Sources[1].Ref].(*bc.Spend)
 185                                 sp.WitnessDestination.Value.AssetId = newAssetID(255)
 186                         },
 187                         err: errUnbalanced,
 188                 },
 189                 {
 190                         desc: "nonempty mux exthash",
 191                         f: func() {
 192                                 mux.ExtHash = newHash(1)
 193                         },
 194                         err: errNonemptyExtHash,
 195                 },
 196                 {
 197                         desc: "nonempty mux exthash, but that's OK",
 198                         f: func() {
 199                                 tx.Version = 2
 200                                 mux.ExtHash = newHash(1)
 201                         },
 202                 },
 203                 {
 204                         desc: "failing nonce program",
 205                         f: func() {
 206                                 iss := txIssuance(t, tx, 0)
 207                                 nonce := tx.Entries[*iss.AnchorId].(*bc.Nonce)
 208                                 nonce.Program.Code = []byte{byte(vm.OP_FALSE)}
 209                         },
 210                         err: vm.ErrFalseVMResult,
 211                 },
 212                 {
 213                         desc: "nonce exthash nonempty",
 214                         f: func() {
 215                                 iss := txIssuance(t, tx, 0)
 216                                 nonce := tx.Entries[*iss.AnchorId].(*bc.Nonce)
 217                                 nonce.ExtHash = newHash(1)
 218                         },
 219                         err: errNonemptyExtHash,
 220                 },
 221                 {
 222                         desc: "nonce exthash nonempty, but that's OK",
 223                         f: func() {
 224                                 tx.Version = 2
 225                                 iss := txIssuance(t, tx, 0)
 226                                 nonce := tx.Entries[*iss.AnchorId].(*bc.Nonce)
 227                                 nonce.ExtHash = newHash(1)
 228                         },
 229                 },
 230                 {
 231                         desc: "mismatched output source / mux dest position",
 232                         f: func() {
 233                                 tx.Entries[*tx.ResultIds[0]].(*bc.Output).Source.Position = 1
 234                         },
 235                         err: errMismatchedPosition,
 236                 },
 237                 {
 238                         desc: "mismatched output source and mux dest",
 239                         f: func() {
 240                                 // For this test, it's necessary to construct a mostly
 241                                 // identical second transaction in order to get a similar but
 242                                 // not equal output entry for the mux to falsely point
 243                                 // to. That entry must be added to the first tx's Entries map.
 244                                 fixture.txOutputs[0].ReferenceData = []byte{1}
 245                                 fixture2 := sample(t, fixture)
 246                                 tx2 := legacy.NewTx(*fixture2.tx).Tx
 247                                 out2ID := tx2.ResultIds[0]
 248                                 out2 := tx2.Entries[*out2ID].(*bc.Output)
 249                                 tx.Entries[*out2ID] = out2
 250                                 mux.WitnessDestinations[0].Ref = out2ID
 251                         },
 252                         err: errMismatchedReference,
 253                 },
 254                 {
 255                         desc: "invalid mux destination position",
 256                         f: func() {
 257                                 mux.WitnessDestinations[0].Position = 1
 258                         },
 259                         err: errPosition,
 260                 },
 261                 {
 262                         desc: "mismatched mux dest value / output source value",
 263                         f: func() {
 264                                 outID := tx.ResultIds[0]
 265                                 out := tx.Entries[*outID].(*bc.Output)
 266                                 mux.WitnessDestinations[0].Value = &bc.AssetAmount{
 267                                         AssetId: out.Source.Value.AssetId,
 268                                         Amount:  out.Source.Value.Amount + 1,
 269                                 }
 270                                 mux.Sources[0].Value.Amount++ // the mux must still balance
 271                         },
 272                         err: errMismatchedValue,
 273                 },
 274                 {
 275                         desc: "output exthash nonempty",
 276                         f: func() {
 277                                 tx.Entries[*tx.ResultIds[0]].(*bc.Output).ExtHash = newHash(1)
 278                         },
 279                         err: errNonemptyExtHash,
 280                 },
 281                 {
 282                         desc: "output exthash nonempty, but that's OK",
 283                         f: func() {
 284                                 tx.Version = 2
 285                                 tx.Entries[*tx.ResultIds[0]].(*bc.Output).ExtHash = newHash(1)
 286                         },
 287                 },
 288                 {
 289                         desc: "empty tx results",
 290                         f: func() {
 291                                 tx.ResultIds = nil
 292                         },
 293                         err: errEmptyResults,
 294                 },
 295                 {
 296                         desc: "empty tx results, but that's OK",
 297                         f: func() {
 298                                 tx.Version = 2
 299                                 tx.ResultIds = nil
 300                         },
 301                 },
 302                 {
 303                         desc: "tx header exthash nonempty",
 304                         f: func() {
 305                                 tx.ExtHash = newHash(1)
 306                         },
 307                         err: errNonemptyExtHash,
 308                 },
 309                 {
 310                         desc: "tx header exthash nonempty, but that's OK",
 311                         f: func() {
 312                                 tx.Version = 2
 313                                 tx.ExtHash = newHash(1)
 314                         },
 315                 },
 316                 {
 317                         desc: "issuance program failure",
 318                         f: func() {
 319                                 iss := txIssuance(t, tx, 0)
 320                                 iss.WitnessArguments[0] = []byte{}
 321                         },
 322                         err: vm.ErrFalseVMResult,
 323                 },
 324                 {
 325                         desc: "issuance exthash nonempty",
 326                         f: func() {
 327                                 iss := txIssuance(t, tx, 0)
 328                                 iss.ExtHash = newHash(1)
 329                         },
 330                         err: errNonemptyExtHash,
 331                 },
 332                 {
 333                         desc: "issuance exthash nonempty, but that's OK",
 334                         f: func() {
 335                                 tx.Version = 2
 336                                 iss := txIssuance(t, tx, 0)
 337                                 iss.ExtHash = newHash(1)
 338                         },
 339                 },
 340                 {
 341                         desc: "spend control program failure",
 342                         f: func() {
 343                                 spend := txSpend(t, tx, 1)
 344                                 spend.WitnessArguments[0] = []byte{}
 345                         },
 346                         err: vm.ErrFalseVMResult,
 347                 },
 348                 {
 349                         desc: "mismatched spent source/witness value",
 350                         f: func() {
 351                                 spend := txSpend(t, tx, 1)
 352                                 spentOutput := tx.Entries[*spend.SpentOutputId].(*bc.Output)
 353                                 spentOutput.Source.Value = &bc.AssetAmount{
 354                                         AssetId: spend.WitnessDestination.Value.AssetId,
 355                                         Amount:  spend.WitnessDestination.Value.Amount + 1,
 356                                 }
 357                         },
 358                         err: errMismatchedValue,
 359                 },
 360                 {
 361                         desc: "spend exthash nonempty",
 362                         f: func() {
 363                                 spend := txSpend(t, tx, 1)
 364                                 spend.ExtHash = newHash(1)
 365                         },
 366                         err: errNonemptyExtHash,
 367                 },
 368                 {
 369                         desc: "spend exthash nonempty, but that's OK",
 370                         f: func() {
 371                                 tx.Version = 2
 372                                 spend := txSpend(t, tx, 1)
 373                                 spend.ExtHash = newHash(1)
 374                         },
 375                 },
 376         }
 377
 378         for _, c := range cases {
 379                 t.Run(c.desc, func(t *testing.T) {
 380                         fixture = sample(t, nil)
 381                         tx = legacy.NewTx(*fixture.tx).Tx
 382                         vs = &validationState{
 383                                 block:   mockBlock(),
 384                                 tx:      tx,
 385                                 entryID: tx.ID,
 386                                 gas: &gasState{
 387                                         gasLeft: int64(80000),
 388                                         gasUsed: 0,
 389                                 },
 390                                 cache: make(map[bc.Hash]error),
 391                         }
 392                         out := tx.Entries[*tx.ResultIds[0]].(*bc.Output)
 393                         muxID := out.Source.Ref
 394                         mux = tx.Entries[*muxID].(*bc.Mux)
 395
 396                         if c.f != nil {
 397                                 c.f()
 398                         }
 399                         err := checkValid(vs, tx.TxHeader)
 400
 401                         if rootErr(err) != c.err {
 402                                 t.Errorf("got error %s, want %s; validationState is:\n%s", err, c.err, spew.Sdump(vs))
 403                         }
 404                 })
 405         }
 406 }
 407
 408 func TestValidateBlock(t *testing.T) {
 409         cases := []struct {
 410                 block *bc.Block
 411                 err   error
 412         }{
 413                 {
 414                         block: &bc.Block{
 415                                 BlockHeader: &bc.BlockHeader{
 416                                         Height: 1,
 417                                 },
 418                                 Transactions: []*bc.Tx{mockCoinbaseTx(624000000000)},
 419                         },
 420                         err: nil,
 421                 },
 422                 {
 423                         block: &bc.Block{
 424                                 BlockHeader: &bc.BlockHeader{
 425                                         Height: 1,
 426                                 },
 427                                 Transactions: []*bc.Tx{mockCoinbaseTx(1)},
 428                         },
 429                         err: errWrongCoinbaseTransaction,
 430                 },
 431                 {
 432                         block: &bc.Block{
 433                                 BlockHeader: &bc.BlockHeader{
 434                                         Height:         1,
 435                                         SerializedSize: 88888888,
 436                                 },
 437                                 Transactions: []*bc.Tx{mockCoinbaseTx(1)},
 438                         },
 439                         err: errWrongBlockSize,
 440                 },
 441         }
 442
 443         for _, c := range cases {
 444                 txRoot, err := bc.MerkleRoot(c.block.Transactions)
 445                 if err != nil {
 446                         t.Errorf("computing transaction merkle root", err)
 447                         continue
 448                 }
 449                 c.block.TransactionsRoot = &txRoot
 450                 err = ValidateBlock(c.block, nil)
 451
 452                 if rootErr(err) != c.err {
 453                         t.Errorf("got error %s, want %s", err, c.err)
 454                 }
 455         }
 456 }
 457
 458 func TestCoinbase(t *testing.T) {
 459         CbTx := mockCoinbaseTx(5000000000)
 460         errCbTx := legacy.MapTx(&legacy.TxData{
 461                 Outputs: []*legacy.TxOutput{
 462                         legacy.NewTxOutput(bc.AssetID{
 463                                 V0: uint64(18446744073709551611),
 464                                 V1: uint64(18446744073709551615),
 465                                 V2: uint64(18446744073709551615),
 466                                 V3: uint64(18446744073709551615),
 467                         }, 800000000000, []byte{1}, nil),
 468                 },
 469         })
 470         cases := []struct {
 471                 block *bc.Block
 472                 tx    *bc.Tx
 473                 err   error
 474         }{
 475                 {
 476                         block: &bc.Block{
 477                                 BlockHeader: &bc.BlockHeader{
 478                                         Height: 666,
 479                                 },
 480                                 Transactions: []*bc.Tx{errCbTx},
 481                         },
 482                         tx:  CbTx,
 483                         err: errWrongCoinbaseTransaction,
 484                 },
 485                 {
 486                         block: &bc.Block{
 487                                 BlockHeader: &bc.BlockHeader{
 488                                         Height: 666,
 489                                 },
 490                                 Transactions: []*bc.Tx{CbTx},
 491                         },
 492                         tx:  CbTx,
 493                         err: nil,
 494                 },
 495                 {
 496                         block: &bc.Block{
 497                                 BlockHeader: &bc.BlockHeader{
 498                                         Height: 666,
 499                                 },
 500                                 Transactions: []*bc.Tx{errCbTx},
 501                         },
 502                         tx:  errCbTx,
 503                         err: errWrongCoinbaseAsset,
 504                 },
 505         }
 506
 507         for _, c := range cases {
 508                 _, err := ValidateTx(c.tx, c.block)
 509
 510                 if rootErr(err) != c.err {
 511                         t.Errorf("got error %s, want %s", err, c.err)
 512                 }
 513         }
 514 }
 515
 516 func TestBlockHeaderValid(t *testing.T) {
 517         base := bc.NewBlockHeader(1, 1, &bc.Hash{}, 1, &bc.Hash{}, &bc.Hash{}, 0, 0)
 518         baseBytes, _ := proto.Marshal(base)
 519
 520         var bh bc.BlockHeader
 521
 522         cases := []struct {
 523                 f   func()
 524                 err error
 525         }{
 526                 {},
 527                 {
 528                         f: func() {
 529                                 bh.Version = 2
 530                         },
 531                 },
 532         }
 533
 534         for i, c := range cases {
 535                 t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
 536                         proto.Unmarshal(baseBytes, &bh)
 537                         if c.f != nil {
 538                                 c.f()
 539                         }
 540                 })
 541         }
 542 }
 543
 544 // A txFixture is returned by sample (below) to produce a sample
 545 // transaction, which takes a separate, optional _input_ txFixture to
 546 // affect the transaction that's built. The components of the
 547 // transaction are the fields of txFixture.
 548 type txFixture struct {
 549         initialBlockID       bc.Hash
 550         issuanceProg         bc.Program
 551         issuanceArgs         [][]byte
 552         assetDef             []byte
 553         assetID              bc.AssetID
 554         txVersion            uint64
 555         txInputs             []*legacy.TxInput
 556         txOutputs            []*legacy.TxOutput
 557         txMinTime, txMaxTime uint64
 558         txRefData            []byte
 559         tx                   *legacy.TxData
 560 }
 561
 562 // Produces a sample transaction in a txFixture object (see above). A
 563 // separate input txFixture can be used to alter the transaction
 564 // that's created.
 565 //
 566 // The output of this function can be used as the input to a
 567 // subsequent call to make iterative refinements to a test object.
 568 //
 569 // The default transaction produced is valid and has three inputs:
 570 //  - an issuance of 10 units
 571 //  - a spend of 20 units
 572 //  - a spend of 40 units
 573 // and two outputs, one of 25 units and one of 45 units.
 574 // All amounts are denominated in the same asset.
 575 //
 576 // The issuance program for the asset requires two numbers as
 577 // arguments that add up to 5. The prevout control programs require
 578 // two numbers each, adding to 9 and 13, respectively.
 579 //
 580 // The min and max times for the transaction are now +/- one minute.
 581 func sample(tb testing.TB, in *txFixture) *txFixture {
 582         var result txFixture
 583         if in != nil {
 584                 result = *in
 585         }
 586
 587         if result.initialBlockID.IsZero() {
 588                 result.initialBlockID = *newHash(1)
 589         }
 590         if testutil.DeepEqual(result.issuanceProg, bc.Program{}) {
 591                 prog, err := vm.Assemble("ADD 5 NUMEQUAL")
 592                 if err != nil {
 593                         tb.Fatal(err)
 594                 }
 595                 result.issuanceProg = bc.Program{VmVersion: 1, Code: prog}
 596         }
 597         if len(result.issuanceArgs) == 0 {
 598                 result.issuanceArgs = [][]byte{[]byte{2}, []byte{3}}
 599         }
 600         if len(result.assetDef) == 0 {
 601                 result.assetDef = []byte{2}
 602         }
 603         if result.assetID.IsZero() {
 604                 refdatahash := hashData(result.assetDef)
 605                 result.assetID = bc.ComputeAssetID(result.issuanceProg.Code, &result.initialBlockID, result.issuanceProg.VmVersion, &refdatahash)
 606         }
 607
 608         if result.txVersion == 0 {
 609                 result.txVersion = 1
 610         }
 611         if len(result.txInputs) == 0 {
 612                 cp1, err := vm.Assemble("ADD 9 NUMEQUAL")
 613                 if err != nil {
 614                         tb.Fatal(err)
 615                 }
 616                 args1 := [][]byte{[]byte{4}, []byte{5}}
 617
 618                 cp2, err := vm.Assemble("ADD 13 NUMEQUAL")
 619                 if err != nil {
 620                         tb.Fatal(err)
 621                 }
 622                 args2 := [][]byte{[]byte{6}, []byte{7}}
 623
 624                 result.txInputs = []*legacy.TxInput{
 625                         legacy.NewIssuanceInput([]byte{3}, 10, []byte{4}, result.initialBlockID, result.issuanceProg.Code, result.issuanceArgs, result.assetDef),
 626                         legacy.NewSpendInput(args1, *newHash(5), result.assetID, 20, 0, cp1, *newHash(6), []byte{7}),
 627                         legacy.NewSpendInput(args2, *newHash(8), result.assetID, 40, 0, cp2, *newHash(9), []byte{10}),
 628                 }
 629         }
 630
 631         result.txInputs = append(result.txInputs, mockGasTxInput())
 632
 633         if len(result.txOutputs) == 0 {
 634                 cp1, err := vm.Assemble("ADD 17 NUMEQUAL")
 635                 if err != nil {
 636                         tb.Fatal(err)
 637                 }
 638                 cp2, err := vm.Assemble("ADD 21 NUMEQUAL")
 639                 if err != nil {
 640                         tb.Fatal(err)
 641                 }
 642
 643                 result.txOutputs = []*legacy.TxOutput{
 644                         legacy.NewTxOutput(result.assetID, 25, cp1, []byte{11}),
 645                         legacy.NewTxOutput(result.assetID, 45, cp2, []byte{12}),
 646                 }
 647         }
 648         if result.txMinTime == 0 {
 649                 result.txMinTime = bc.Millis(time.Now().Add(-time.Minute))
 650         }
 651         if result.txMaxTime == 0 {
 652                 result.txMaxTime = bc.Millis(time.Now().Add(time.Minute))
 653         }
 654         if len(result.txRefData) == 0 {
 655                 result.txRefData = []byte{13}
 656         }
 657
 658         result.tx = &legacy.TxData{
 659                 Version:       result.txVersion,
 660                 Inputs:        result.txInputs,
 661                 Outputs:       result.txOutputs,
 662                 MinTime:       result.txMinTime,
 663                 MaxTime:       result.txMaxTime,
 664                 ReferenceData: result.txRefData,
 665         }
 666
 667         return &result
 668 }
 669
 670 func mockBlock() *bc.Block {
 671         return &bc.Block{
 672                 BlockHeader: &bc.BlockHeader{
 673                         Height: 666,
 674                 },
 675         }
 676 }
 677
 678 func mockCoinbaseTx(amount uint64) *bc.Tx {
 679         return legacy.MapTx(&legacy.TxData{
 680                 Outputs: []*legacy.TxOutput{
 681                         legacy.NewTxOutput(*consensus.BTMAssetID, amount, []byte{1}, nil),
 682                 },
 683         })
 684 }
 685
 686 func mockGasTxInput() *legacy.TxInput {
 687         return legacy.NewSpendInput([][]byte{}, *newHash(8), *consensus.BTMAssetID, 100000000, 0, []byte{byte(vm.OP_TRUE)}, *newHash(9), []byte{})
 688 }
 689
 690 // Like errors.Root, but also unwraps vm.Error objects.
 691 func rootErr(e error) error {
 692         for {
 693                 e = errors.Root(e)
 694                 if e2, ok := e.(vm.Error); ok {
 695                         e = e2.Err
 696                         continue
 697                 }
 698                 return e
 699         }
 700 }
 701
 702 func hashData(data []byte) bc.Hash {
 703         var b32 [32]byte
 704         sha3pool.Sum256(b32[:], data)
 705         return bc.NewHash(b32)
 706 }
 707
 708 func newHash(n byte) *bc.Hash {
 709         h := bc.NewHash([32]byte{n})
 710         return &h
 711 }
 712
 713 func newAssetID(n byte) *bc.AssetID {
 714         a := bc.NewAssetID([32]byte{n})
 715         return &a
 716 }
 717
 718 func txIssuance(t *testing.T, tx *bc.Tx, index int) *bc.Issuance {
 719         id := tx.InputIDs[index]
 720         res, err := tx.Issuance(id)
 721         if err != nil {
 722                 t.Fatal(err)
 723         }
 724         return res
 725 }
 726
 727 func txSpend(t *testing.T, tx *bc.Tx, index int) *bc.Spend {
 728         id := tx.InputIDs[index]
 729         res, err := tx.Spend(id)
 730         if err != nil {
 731                 t.Fatal(err)
 732         }
 733         return res
 734 }