f3849f5c10
* Structs and wire messages for HTLCs * Wire protocol for a state machine with no blocking(!!!) (I will write the state machine) TL;DR: Can do multiple HTLC modifications in-flight, dead simple wire protocol. Both sides can update their Commitments unliaterally without waiting for the other party's signature. Will have basic/preliminary notes in the README * Added **swp to .gitignore because of vim annoyances
547 lines
12 KiB
Go
547 lines
12 KiB
Go
package lnwire
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"io"
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"io/ioutil"
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)
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var MAX_SLICE_LENGTH = 65535
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//Actual pkScript, not redeemScript
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type PkScript []byte
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//Subsatoshi amount (Micro-Satoshi, 1/1000th)
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//Should be a signed int to account for negative fees
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//
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//"In any science-fiction movie, anywhere in the galaxy, currency is referred
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//to as 'credits.'"
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// --Sam Humphries. Ebert, Roger (1999). Ebert's bigger little movie
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// glossary. Andrews McMeel. p. 172.
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//
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//https://en.wikipedia.org/wiki/List_of_fictional_currencies
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//https://en.wikipedia.org/wiki/Fictional_currency#Trends_in_the_use_of_fictional_currencies
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//http://tvtropes.org/pmwiki/pmwiki.php/Main/WeWillSpendCreditsInTheFuture
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type CreditsAmount int32 //Credits (XCB, accountants should use XCB :^)
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//US Display format: 1 BTC = 100,000,000'000 XCB
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//Or in BTC = 1.00000000'000
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//Writes the big endian representation of element
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//Unified function to call when writing different types
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//Pre-allocate a byte-array of the correct size for cargo-cult security
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//More copies but whatever...
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func writeElement(w io.Writer, element interface{}) error {
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var err error
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switch e := element.(type) {
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case uint8:
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var b [1]byte
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b[0] = byte(e)
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_, err = w.Write(b[:])
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if err != nil {
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return err
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}
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return nil
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case uint16:
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var b [2]byte
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binary.BigEndian.PutUint16(b[:], uint16(e))
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_, err = w.Write(b[:])
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if err != nil {
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return err
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}
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return nil
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case CreditsAmount:
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err = binary.Write(w, binary.BigEndian, int32(e))
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if err != nil {
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return err
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}
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return nil
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case uint32:
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var b [4]byte
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binary.BigEndian.PutUint32(b[:], uint32(e))
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_, err = w.Write(b[:])
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if err != nil {
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return err
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}
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return nil
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case uint64:
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var b [8]byte
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binary.BigEndian.PutUint64(b[:], uint64(e))
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_, err = w.Write(b[:])
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if err != nil {
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return err
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}
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return nil
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case btcutil.Amount:
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err = binary.Write(w, binary.BigEndian, int64(e))
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if err != nil {
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return err
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}
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return nil
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case *btcec.PublicKey:
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var b [33]byte
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serializedPubkey := e.SerializeCompressed()
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if len(serializedPubkey) != 33 {
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return fmt.Errorf("Wrong size pubkey")
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}
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copy(b[:], serializedPubkey)
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_, err = w.Write(b[:])
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if err != nil {
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return err
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}
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return nil
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case []*btcec.Signature:
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numSigs := len(e)
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if numSigs > 127 {
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return fmt.Errorf("Too many signatures!")
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}
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//Write the size
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err = writeElement(w, uint8(numSigs))
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if err != nil {
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return err
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}
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//Write the data
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for i := 0; i < numSigs; i++ {
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err = writeElement(w, e[i])
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if err != nil {
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return err
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}
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}
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return nil
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case *btcec.Signature:
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sig := e.Serialize()
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sigLength := len(sig)
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if sigLength > 73 {
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return fmt.Errorf("Signature too long!")
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}
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//Write the size
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err = writeElement(w, uint8(sigLength))
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if err != nil {
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return err
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}
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//Write the data
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_, err = w.Write(sig)
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if err != nil {
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return err
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}
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return nil
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case *wire.ShaHash:
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_, err = w.Write(e[:])
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if err != nil {
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return err
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}
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return nil
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case []*[20]byte:
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//Get size of slice and dump in slice
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sliceSize := len(e)
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err = writeElement(w, uint16(sliceSize))
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if err != nil {
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return err
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}
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//Write in each sequentially
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for _, element := range e {
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err = writeElement(w, &element)
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if err != nil {
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return err
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}
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}
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return nil
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case **[20]byte:
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_, err = w.Write((*e)[:])
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if err != nil {
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return err
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}
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case [20]byte:
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_, err = w.Write(e[:])
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if err != nil {
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return err
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}
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return nil
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case wire.BitcoinNet:
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var b [4]byte
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binary.BigEndian.PutUint32(b[:], uint32(e))
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_, err := w.Write(b[:])
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if err != nil {
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return err
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}
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return nil
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case []byte:
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sliceLength := len(e)
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if sliceLength > MAX_SLICE_LENGTH {
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return fmt.Errorf("Slice length too long!")
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}
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//Write the size
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err = writeElement(w, uint16(sliceLength))
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if err != nil {
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return err
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}
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//Write the data
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_, err = w.Write(e)
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if err != nil {
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return err
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}
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return nil
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case PkScript:
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scriptLength := len(e)
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//Make sure it's P2PKH or P2SH size or less
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if scriptLength > 25 {
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return fmt.Errorf("PkScript too long!")
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}
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//Write the size (1-byte)
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err = writeElement(w, uint8(scriptLength))
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if err != nil {
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return err
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}
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//Write the data
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_, err = w.Write(e)
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if err != nil {
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return err
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}
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return nil
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case []*wire.TxIn:
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//Append the unsigned(!!!) txins
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//Write the size (1-byte)
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if len(e) > 127 {
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return fmt.Errorf("Too many txins")
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}
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err = writeElement(w, uint8(len(e)))
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if err != nil {
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return err
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}
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//Append the actual TxIns (Size: NumOfTxins * 36)
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//Do not include the sequence number to eliminate funny business
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for _, in := range e {
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err = writeElement(w, in)
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if err != nil {
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return err
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}
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}
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return nil
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case *wire.TxIn:
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//Hash
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var h [32]byte
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copy(h[:], e.PreviousOutPoint.Hash.Bytes())
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_, err = w.Write(h[:])
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if err != nil {
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return err
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}
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//Index
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var idx [4]byte
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binary.BigEndian.PutUint32(idx[:], e.PreviousOutPoint.Index)
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_, err = w.Write(idx[:])
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if err != nil {
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return err
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}
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return nil
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default:
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return fmt.Errorf("Unknown type in writeElement: %T", e)
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}
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return nil
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}
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func writeElements(w io.Writer, elements ...interface{}) error {
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for _, element := range elements {
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err := writeElement(w, element)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func readElement(r io.Reader, element interface{}) error {
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var err error
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switch e := element.(type) {
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case *uint8:
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var b [1]uint8
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_, err = r.Read(b[:])
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if err != nil {
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return err
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}
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*e = b[0]
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return nil
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case *uint16:
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var b [2]byte
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_, err = io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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*e = binary.BigEndian.Uint16(b[:])
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return nil
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case *CreditsAmount:
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var b [4]byte
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_, err = io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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*e = CreditsAmount(int32(binary.BigEndian.Uint32(b[:])))
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return nil
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case *uint32:
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var b [4]byte
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_, err = io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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*e = binary.BigEndian.Uint32(b[:])
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return nil
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case *uint64:
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var b [8]byte
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_, err = io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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*e = binary.BigEndian.Uint64(b[:])
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return nil
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case *btcutil.Amount:
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var b [8]byte
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_, err = io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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*e = btcutil.Amount(int64(binary.BigEndian.Uint64(b[:])))
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return nil
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case **wire.ShaHash:
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var b wire.ShaHash
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_, err = io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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*e = &b
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return nil
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case **btcec.PublicKey:
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var b [33]byte
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_, err = io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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x, err := btcec.ParsePubKey(b[:], btcec.S256())
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if err != nil {
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return err
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}
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*e = &*x
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return nil
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case *[]*btcec.Signature:
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var numSigs uint8
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err = readElement(r, &numSigs)
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if err != nil {
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return err
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}
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if numSigs > 127 {
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return fmt.Errorf("Too many signatures!")
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}
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//Read that number of signatures
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var sigs []*btcec.Signature
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for i := uint8(0); i < numSigs; i++ {
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sig := new(btcec.Signature)
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err = readElement(r, &sig)
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if err != nil {
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return err
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}
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sigs = append(sigs, sig)
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}
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*e = *&sigs
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return nil
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case **btcec.Signature:
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var sigLength uint8
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err = readElement(r, &sigLength)
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if err != nil {
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return err
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}
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if sigLength > 73 {
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return fmt.Errorf("Signature too long!")
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}
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//Read the sig length
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l := io.LimitReader(r, int64(sigLength))
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sig, err := ioutil.ReadAll(l)
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if err != nil {
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return err
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}
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if len(sig) != int(sigLength) {
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return fmt.Errorf("EOF: Signature length mismatch.")
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}
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btcecSig, err := btcec.ParseSignature(sig, btcec.S256())
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if err != nil {
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return err
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}
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*e = &*btcecSig
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return nil
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case *[]*[20]byte:
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//How many to read
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var sliceSize uint16
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err = readElement(r, &sliceSize)
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if err != nil {
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return err
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}
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var data []*[20]byte
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//Append the actual
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for i := uint16(0); i < sliceSize; i++ {
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var element [20]byte
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err = readElement(r, &element)
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if err != nil {
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return err
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}
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data = append(data, &element)
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}
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*e = data
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return nil
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case *[20]byte:
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_, err = io.ReadFull(r, e[:])
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if err != nil {
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return err
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}
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return nil
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case *wire.BitcoinNet:
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var b [4]byte
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_, err := io.ReadFull(r, b[:])
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if err != nil {
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return err
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}
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*e = wire.BitcoinNet(binary.BigEndian.Uint32(b[:]))
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return nil
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case *[]byte:
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//Get the blob length first
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var blobLength uint16
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err = readElement(r, &blobLength)
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if err != nil {
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return err
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}
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//Shouldn't need to do this, since it's uint16, but we
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//might have a different value for MAX_SLICE_LENGTH...
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if int(blobLength) > MAX_SLICE_LENGTH {
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return fmt.Errorf("Slice length too long!")
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}
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//Read the slice length
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l := io.LimitReader(r, int64(blobLength))
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*e, err = ioutil.ReadAll(l)
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if err != nil {
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return err
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}
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if len(*e) != int(blobLength) {
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return fmt.Errorf("EOF: Slice length mismatch.")
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}
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return nil
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case *PkScript:
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//Get the script length first
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var scriptLength uint8
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err = readElement(r, &scriptLength)
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if err != nil {
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return err
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}
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if scriptLength > 25 {
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return fmt.Errorf("PkScript too long!")
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}
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//Read the script length
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l := io.LimitReader(r, int64(scriptLength))
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*e, err = ioutil.ReadAll(l)
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if err != nil {
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return err
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}
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if len(*e) != int(scriptLength) {
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return fmt.Errorf("EOF: Signature length mismatch.")
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}
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return nil
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case *[]*wire.TxIn:
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//Read the size (1-byte number of txins)
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var numScripts uint8
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err = readElement(r, &numScripts)
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if err != nil {
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return err
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}
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if numScripts > 127 {
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return fmt.Errorf("Too many txins")
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}
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//Append the actual TxIns
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var txins []*wire.TxIn
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for i := uint8(0); i < numScripts; i++ {
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outpoint := new(wire.OutPoint)
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txin := wire.NewTxIn(outpoint, nil)
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err = readElement(r, &txin)
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if err != nil {
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return err
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}
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txins = append(txins, txin)
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}
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*e = *&txins
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return nil
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case **wire.TxIn:
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//Hash
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var h [32]byte
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_, err = io.ReadFull(r, h[:])
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if err != nil {
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return err
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}
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hash, err := wire.NewShaHash(h[:])
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if err != nil {
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return err
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}
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(*e).PreviousOutPoint.Hash = *hash
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//Index
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var idxBytes [4]byte
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_, err = io.ReadFull(r, idxBytes[:])
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if err != nil {
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return err
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}
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(*e).PreviousOutPoint.Index = binary.BigEndian.Uint32(idxBytes[:])
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return nil
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default:
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return fmt.Errorf("Unknown type in readElement: %T", e)
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}
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return nil
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}
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func readElements(r io.Reader, elements ...interface{}) error {
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for _, element := range elements {
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err := readElement(r, element)
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if err != nil {
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return err
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}
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}
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return nil
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}
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//Validates whether a PkScript byte array is P2SH or P2PKH
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func ValidatePkScript(pkScript PkScript) error {
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if &pkScript == nil {
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return fmt.Errorf("PkScript should not be empty!")
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}
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if len(pkScript) == 25 {
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//P2PKH
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//Begins with OP_DUP OP_HASH160 PUSHDATA(20)
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if !bytes.Equal(pkScript[0:3], []byte{118, 169, 20}) ||
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//Ends with OP_EQUALVERIFY OP_CHECKSIG
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!bytes.Equal(pkScript[23:25], []byte{136, 172}) {
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//If it's not correct, return error
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return fmt.Errorf("PkScript only allows P2SH or P2PKH")
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}
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} else if len(pkScript) == 23 {
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//P2SH
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//Begins with OP_HASH160 PUSHDATA(20)
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if !bytes.Equal(pkScript[0:2], []byte{169, 20}) ||
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//Ends with OP_EQUAL
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!bytes.Equal(pkScript[22:23], []byte{135}) {
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//If it's not correct, return error
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return fmt.Errorf("PkScript only allows P2SH or P2PKH")
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}
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} else {
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//Length not 23 or 25
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return fmt.Errorf("PkScript only allows P2SH or P2PKH")
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}
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return nil
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}
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