proof: add magic bytes to individual proofs and proof files

cmd/tapcli/proofs.go

@@ -75,7 +75,7 @@ func verifyProof(ctx *cli.Context) error {
  defer cleanUp()
 
  resp, err := client.VerifyProof(ctxc, &taprpc.ProofFile{
- RawProof: rawFile,
+ RawProofFile: rawFile,
  })
  if err != nil {
  return fmt.Errorf("unable to verify proof file: %w", err)
@@ -273,7 +273,7 @@ func exportProof(ctx *cli.Context) error {
  // JSON format.
  if ctx.String(proofPathName) != "" {
  filePath := lncfg.CleanAndExpandPath(ctx.String(proofPathName))
- return writeToFile(filePath, resp.RawProof)
+ return writeToFile(filePath, resp.RawProofFile)
  }
 
  printRespJSON(resp)

itest/addrs_test.go

@@ -296,10 +296,10 @@ func sendProof(t *harnessTest, src, dst *tapdHarness, scriptKey []byte,
  }, defaultWaitTimeout)
  require.NoError(t.t, waitErr)
 
- t.Logf("Importing proof %x", proofResp.RawProof)
+ t.Logf("Importing proof %x", proofResp.RawProofFile)
 
  importResp, err := dst.ImportProof(ctxb, &tapdevrpc.ImportProofRequest{
- ProofFile: proofResp.RawProof,
+ ProofFile: proofResp.RawProofFile,
  GenesisPoint: genInfo.GenesisPoint,
  })
  require.NoError(t.t, err)

itest/assertions.go

@@ -225,7 +225,7 @@ func WaitForProofUpdate(t *testing.T, client taprpc.TaprootAssetsClient,
 
  f := &proof.File{}
  require.NoError(
- t, f.Decode(bytes.NewReader(exportResp.RawProof)),
+ t, f.Decode(bytes.NewReader(exportResp.RawProofFile)),
  )
  lastProof, err := f.LastProof()
  require.NoError(t, err)
@@ -255,7 +255,7 @@ func AssertAssetProofs(t *testing.T, tapClient taprpc.TaprootAssetsClient,
  require.NoError(t, err)
 
  file, snapshot := verifyProofBlob(
- t, tapClient, chainClient, a, exportResp.RawProof,
+ t, tapClient, chainClient, a, exportResp.RawProofFile,
  )
 
  assetJSON, err := formatProtoJSON(a)
@@ -268,7 +268,7 @@ func AssertAssetProofs(t *testing.T, tapClient taprpc.TaprootAssetsClient,
  t, CommitmentKey(t, a), snapshot.Asset.AssetCommitmentKey(),
  )
 
- return exportResp.RawProof
+ return exportResp.RawProofFile
 }
 
 // assertAssetProofsInvalid makes sure the proofs for the given asset can be
@@ -289,11 +289,11 @@ func assertAssetProofsInvalid(t *testing.T, tapd *tapdHarness,
  require.NoError(t, err)
 
  f := &proof.File{}
- require.NoError(t, f.Decode(bytes.NewReader(exportResp.RawProof)))
+ require.NoError(t, f.Decode(bytes.NewReader(exportResp.RawProofFile)))
 
  // Also make sure that the RPC can verify the proof as well.
  verifyResp, err := tapd.VerifyProof(ctxt, &taprpc.ProofFile{
- RawProof: exportResp.RawProof,
+ RawProofFile: exportResp.RawProofFile,
  })
  require.NoError(t, err)
  require.False(t, verifyResp.Valid)
@@ -314,7 +314,7 @@ func verifyProofBlob(t *testing.T, tapClient taprpc.TaprootAssetsClient,
 
  // Also make sure that the RPC can verify the proof as well.
  verifyResp, err := tapClient.VerifyProof(ctxt, &taprpc.ProofFile{
- RawProof: blob,
+ RawProofFile: blob,
  })
  require.NoError(t, err)
  require.True(t, verifyResp.Valid)

itest/send_test.go

@@ -861,11 +861,11 @@ func addProofTestVectorFromFile(t *testing.T, testName string,
  require.NoError(t, waitErr)
 
  if binaryFileName != "" {
- test.WriteTestFileHex(t, binaryFileName, proofResp.RawProof)
+ test.WriteTestFileHex(t, binaryFileName, proofResp.RawProofFile)
  }
 
  var f proof.File
- err := f.Decode(bytes.NewReader(proofResp.RawProof))
+ err := f.Decode(bytes.NewReader(proofResp.RawProofFile))
  require.NoError(t, err)
 
  if f.NumProofs() <= fileIndex {

proof/file.go

@@ -97,7 +97,15 @@ func NewFile(v Version, proofs ...Proof) (*File, error) {
 
 // Encode encodes the proof file into `w` including its checksum.
 func (f *File) Encode(w io.Writer) error {
- err := binary.Write(w, binary.BigEndian, uint32(f.Version))
+ num, err := w.Write(FilePrefixMagicBytes[:])
+ if err != nil {
+ return err
+ }
+ if num != PrefixMagicBytesLength {
+ return errors.New("failed to write prefix magic bytes")
+ }
+
+ err = binary.Write(w, binary.BigEndian, uint32(f.Version))
  if err != nil {
  return err
  }
@@ -137,6 +145,21 @@ func (f *File) Encode(w io.Writer) error {
 
 // Decode decodes a proof file from `r`.
 func (f *File) Decode(r io.Reader) error {
+ var prefixMagicBytes [PrefixMagicBytesLength]byte
+ num, err := r.Read(prefixMagicBytes[:])
+ if err != nil {
+ return err
+ }
+ if num != PrefixMagicBytesLength {
+ return errors.New("failed to read prefix magic bytes")
+ }
+
+ if prefixMagicBytes != FilePrefixMagicBytes {
+ return fmt.Errorf("invalid prefix magic bytes, expected %s, "+
+ "got %s", string(FilePrefixMagicBytes[:]),
+ string(prefixMagicBytes[:]))
+ }
+
  var version uint32
  if err := binary.Read(r, binary.BigEndian, &version); err != nil {
  return err

proof/proof.go

@@ -1,7 +1,9 @@
 package proof
 
 import (
+ "bytes"
  "errors"
+ "fmt"
  "io"
 
  "github.com/btcsuite/btcd/wire"
@@ -58,6 +60,48 @@ var (
  RegtestOwnershipProofName = "ownership-proof.hex"
 )
 
+const (
+ // PrefixMagicBytesLength is the length of the magic bytes that are
+ // prefixed to individual proofs or proof files.
+ PrefixMagicBytesLength = 4
+)
+
+var (
+ // PrefixMagicBytes are the magic bytes that are prefixed to an
+ // individual transition or mint proof when encoding it. This is the
+ // ASCII encoding of the string "TAPP" (Taproot Assets Protocol Proof)
+ // in hex.
+ PrefixMagicBytes = [PrefixMagicBytesLength]byte{0x54, 0x41, 0x50, 0x50}
+
+ // FilePrefixMagicBytes are the magic bytes that are prefixed to a proof
+ // file when encoding it. This is the ASCII encoding of the string
+ // "TAPF" (Taproot Assets Protocol File) in hex.
+ FilePrefixMagicBytes = [PrefixMagicBytesLength]byte{
+ 0x54, 0x41, 0x50, 0x46,
+ }
+)
+
+// IsSingleProof returns true if the given blob is an encoded individual
+// mint/transition proof.
+func IsSingleProof(blob Blob) bool {
+ if len(blob) < PrefixMagicBytesLength {
+ return false
+ }
+
+ return bytes.Equal(blob[:PrefixMagicBytesLength], PrefixMagicBytes[:])
+}
+
+// IsProofFile returns true if the given blob is an encoded proof file.
+func IsProofFile(blob Blob) bool {
+ if len(blob) < PrefixMagicBytesLength {
+ return false
+ }
+
+ return bytes.Equal(
+ blob[:PrefixMagicBytesLength], FilePrefixMagicBytes[:],
+ )
+}
+
 // UpdateCallback is a callback that is called when proofs are updated because
 // of a re-org.
 type UpdateCallback func([]*Proof) error
@@ -212,6 +256,14 @@ func (p *Proof) DecodeRecords() []tlv.Record {
 
 // Encode encodes a Proof into `w`.
 func (p *Proof) Encode(w io.Writer) error {
+ num, err := w.Write(PrefixMagicBytes[:])
+ if err != nil {
+ return err
+ }
+ if num != PrefixMagicBytesLength {
+ return errors.New("failed to write prefix magic bytes")
+ }
+
  stream, err := tlv.NewStream(p.EncodeRecords()...)
  if err != nil {
  return err
@@ -221,6 +273,21 @@ func (p *Proof) Encode(w io.Writer) error {
 
 // Decode decodes a Proof from `r`.
 func (p *Proof) Decode(r io.Reader) error {
+ var prefixMagicBytes [PrefixMagicBytesLength]byte
+ num, err := r.Read(prefixMagicBytes[:])
+ if err != nil {
+ return err
+ }
+ if num != PrefixMagicBytesLength {
+ return errors.New("failed to read prefix magic bytes")
+ }
+
+ if prefixMagicBytes != PrefixMagicBytes {
+ return fmt.Errorf("invalid prefix magic bytes, expected %s, "+
+ "got %s", string(PrefixMagicBytes[:]),
+ string(prefixMagicBytes[:]))
+ }
+
  stream, err := tlv.NewStream(p.DecodeRecords()...)
  if err != nil {
  return err

proof/proof_test.go

@@ -246,12 +246,38 @@ func TestProofEncoding(t *testing.T) {
  require.NoError(t, err)
  proof.AdditionalInputs = []File{*file, *file}
 
- var buf bytes.Buffer
- require.NoError(t, proof.Encode(&buf))
+ var proofBuf bytes.Buffer
+ require.NoError(t, proof.Encode(&proofBuf))
+ proofBytes := proofBuf.Bytes()
+
  var decodedProof Proof
- require.NoError(t, decodedProof.Decode(&buf))
+ require.NoError(t, decodedProof.Decode(bytes.NewReader(proofBytes)))
 
  assertEqualProof(t, &proof, &decodedProof)
+
+ // Make sure the proof and proof file prefixes are checked correctly.
+ var fileBuf bytes.Buffer
+ require.NoError(t, file.Encode(&fileBuf))
+ fileBytes := fileBuf.Bytes()
+
+ p := &Proof{}
+ err = p.Decode(bytes.NewReader(fileBytes))
+ require.ErrorContains(
+ t, err, "invalid prefix magic bytes, expected TAPP",
+ )
+
+ f := &File{}
+ err = f.Decode(bytes.NewReader(proofBytes))
+ require.ErrorContains(
+ t, err, "invalid prefix magic bytes, expected TAPF",
+ )
+
+ require.True(t, IsSingleProof(proofBytes))
+ require.True(t, IsProofFile(fileBytes))
+ require.False(t, IsProofFile(proofBytes))
+ require.False(t, IsSingleProof(fileBytes))
+ require.False(t, IsProofFile(nil))
+ require.False(t, IsSingleProof(nil))
 }
 
 func genRandomGenesisWithProof(t testing.TB, assetType asset.Type,

proof/testdata/ownership-proof.hex

@@ -1 +1 @@
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