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Add format field to the blockchain header. This allows backward compatibility. Close #32

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Kleissner
2021-08-25 01:13:00 +02:00
parent 6c399a7be9
commit ea80588fa1
1 changed files with 17 additions and 9 deletions
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26
Blockchain.go
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@@ -8,9 +8,10 @@ The key for the blockchain header is keyHeader and for each block is the block n
Encoding of the blockchain header:
Offset Size Info
0 8 Height
8 8 Version
16 65 Signature
0 8 Height of the blockchain
8 8 Version of the blockchain
16 2 Format of the block data. 0 = Current format. This is for backward compatibility and supporting changes to the block structure in the future.
18 65 Signature
Encoding of each block (it is the same stored in the database and shared in a message):
Offset Size Info
@@ -58,6 +59,7 @@ const keyHeader = "header blockchain"
var userBlockchainHeader struct {
height uint64
version uint64
format uint16
publicKey *btcec.PublicKey
sync.Mutex
}
@@ -101,26 +103,32 @@ func blockchainHeaderRead(db store.Store) (publicKey *btcec.PublicKey, height, v
return nil, 0, 0, false, nil
}
if len(buffer) != 81 {
if len(buffer) != 83 {
return nil, 0, 0, true, errors.New("blockchain header size mismatch")
}
height = binary.LittleEndian.Uint64(buffer[0:8])
version = binary.LittleEndian.Uint64(buffer[8:16])
signature := buffer[16 : 16+65]
format := binary.LittleEndian.Uint16(buffer[16:18])
signature := buffer[18 : 18+65]
publicKey, _, err = btcec.RecoverCompact(btcec.S256(), signature, hashData(buffer[0:16]))
if format != 0 {
return nil, 0, 0, true, errors.New("future blockchain format not supported. You must go back to the future!")
}
publicKey, _, err = btcec.RecoverCompact(btcec.S256(), signature, hashData(buffer[0:18]))
return
}
// blockchainHeaderWrite writes the header to the blockchain and signs it.
func blockchainHeaderWrite(db store.Store, privateKey *btcec.PrivateKey, height, version uint64) (err error) {
var buffer [81]byte
var buffer [83]byte
binary.LittleEndian.PutUint64(buffer[0:8], height)
binary.LittleEndian.PutUint64(buffer[8:16], version)
binary.LittleEndian.PutUint16(buffer[16:18], 0)
signature, err := btcec.SignCompact(btcec.S256(), privateKey, hashData(buffer[0:16]), true)
signature, err := btcec.SignCompact(btcec.S256(), privateKey, hashData(buffer[0:18]), true)
if err != nil {
return err
@@ -128,7 +136,7 @@ func blockchainHeaderWrite(db store.Store, privateKey *btcec.PrivateKey, height,
return errors.New("signature length invalid")
}
copy(buffer[16:16+65], signature)
copy(buffer[18:18+65], signature)
err = db.Set([]byte(keyHeader), buffer[:])