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txMultiSig.go
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txMultiSig.go
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package lbtcTransaction
import (
"encoding/hex"
"errors"
owcrypt "github.com/nbit99/go-owcrypt"
)
// type msSigPub struct {
// sig []byte
// pub []byte
// }
type txMultiSig struct {
nRequired byte
sigPub []SignaturePubkey
}
func CreateMultiSig(required byte, pubkeys [][]byte, SegwitON bool, addressPrefix AddressPrefix) (string, string, error) {
if required < 1 {
return "", "", errors.New("A multisignature address must require at least one key to redeem!")
}
if required > byte(len(pubkeys)) {
return "", "", errors.New("Not enough keys supplied for a multisignature address to redeem!")
}
if len(pubkeys) > 16 {
return "", "", errors.New("Number of keys involved in the multisignature address creation is too big!")
}
redeem := []byte{}
redeem = append(redeem, OpCode_1+required-1)
for _, k := range pubkeys {
if len(k) != 33 && len(k) != 65 {
return "", "", errors.New("Invalid pubkey data for multisignature address!")
}
redeem = append(redeem, byte(len(k)))
redeem = append(redeem, k...)
}
redeem = append(redeem, OpCode_1+byte(len(pubkeys))-1)
redeem = append(redeem, OpCheckMultiSig)
if len(redeem) > MaxScriptElementSize {
return "", "", errors.New("Redeem script exceeds size limit!")
}
var redeemHash []byte
if SegwitON {
redeemHash = owcrypt.Hash(redeem, 0, owcrypt.HASH_ALG_SHA256)
redeemHash = append([]byte{0x00, 0x20}, redeemHash...)
redeemHash = owcrypt.Hash(redeemHash, 0, owcrypt.HASH_ALG_HASH160)
} else {
redeemHash = owcrypt.Hash(redeem, 0, owcrypt.HASH_ALG_HASH160)
}
return EncodeCheck(addressPrefix.P2PKHPrefix, redeemHash), hex.EncodeToString(redeem), nil
}
func getMultiDetails(redeem []byte) (byte, []string, error) {
pubkeys := []string{}
limit := len(redeem)
index := 0
if index+1 > limit {
return 0, nil, errors.New("Invalid redeem script for multisig UTXO!")
}
nRequired := redeem[index] + 1 - OpCode_1
index++
if nRequired <= 0 || nRequired > 16 {
return 0, nil, errors.New("Required number is invalid for a multisig redeem!")
}
for {
if index+1 > limit {
return 0, nil, errors.New("Invalid redeem script for multisig UTXO!")
}
if redeem[index] != 0x21 {
break
}
index++
if index+0x21 > limit {
return 0, nil, errors.New("Invalid redeem script for multisig UTXO!")
}
pubkeys = append(pubkeys, hex.EncodeToString(redeem[index:index+0x21]))
index += 0x21
}
if index+1 > limit {
return 0, nil, errors.New("Invalid redeem script for multisig UTXO!")
}
total := redeem[index] + 1 - OpCode_1
if total != byte(len(pubkeys)) || total < nRequired {
return 0, nil, errors.New("Invalid redeem script for multisig UTXO!")
}
return nRequired, pubkeys, nil
}
func decodeMultiBytes(script []byte) ([]SignaturePubkey, []byte, error) {
var sp []SignaturePubkey
var st []byte
if script == nil || len(script) == 0 {
return nil, nil, errors.New("Invalid multisig script data!")
}
limit := len(script)
index := 0
length := 0
if index+1 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
if script[index] == 0 {
} else if script[index] == 0xFD {
index++
if index+2 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
length = int(littleEndianBytesToUint16(script[index : index+2]))
index += 2
if length+3 != limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
} else {
length = int(script[index])
index++
if length+1 != limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
}
if script[index] != 0x00 {
return nil, nil, errors.New("Invalid multisig script data!")
}
index++
for {
if index+2 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
sigLen := script[index]
if script[index+1] != 0x30 {
break
}
if index+int(sigLen)+1 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
sig, sigType, err := decodeSignatureFromScript(script[index : index+int(sigLen)+1])
if err != nil {
return nil, nil, err
}
sp = append(sp, SignaturePubkey{sig, nil})
st = append(st, sigType)
index += int(sigLen + 1)
}
if index+1 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
redeemLen := 0
if script[index] == OpPushData1 {
index++
if index+1 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
redeemLen = int(script[index])
index++
} else if script[index] == OpPushData2 {
index++
if index+2 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
redeemLen = int(littleEndianBytesToUint16(script[index : index+2]))
index += 2
} else {
redeemLen = int(script[index])
index++
}
if index+1 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
required := script[index] + 1 - OpCode_1
index++
if int(required) != len(sp) {
return nil, nil, errors.New("Multisig not completely signed!")
}
if index+int(redeemLen)-1 != limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
if script[len(script)-1] != OpCheckMultiSig {
return nil, nil, errors.New("Invalid multisig script data!")
}
pubkeys := int(script[len(script)-2]) + 1 - int(OpCode_1)
pscript := script[index : len(script)-2]
if pubkeys > len(sp) {
for i := 0; i < pubkeys-len(sp); i++ {
sp = append(sp, SignaturePubkey{nil, nil})
st = append(st, 0)
}
}
index = 0
limit = redeemLen
for i := 0; i < pubkeys; i++ {
if index+1 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
if pscript[index] != 0x21 {
return nil, nil, errors.New("Invalid multisig script data!")
}
index++
if index+0x21 > limit {
return nil, nil, errors.New("Invalid multisig script data!")
}
sp[i].Pubkey = pscript[index : index+0x21]
index += 0x21
}
return sp, st, nil
}