func dump_raw_sigscript(d []byte) bool {
ss, er := btc.ScriptToText(d)
if er != nil {
println(er.Error())
return false
}
p2sh := len(ss) >= 2 && d[0] == 0
if p2sh {
ms, er := btc.NewMultiSigFromScript(d)
if er == nil {
fmt.Println(" Multisig script", ms.SigsNeeded, "of", len(ms.PublicKeys))
for i := range ms.PublicKeys {
fmt.Printf(" pkey%d = %s\n", i+1, hex.EncodeToString(ms.PublicKeys[i]))
}
for i := range ms.Signatures {
fmt.Printf(" R%d = %64s\n", i+1, hex.EncodeToString(ms.Signatures[i].R.Bytes()))
fmt.Printf(" S%d = %64s\n", i+1, hex.EncodeToString(ms.Signatures[i].S.Bytes()))
fmt.Printf(" HashType%d = %02x\n", i+1, ms.Signatures[i].HashType)
}
return len(ms.Signatures) >= int(ms.SigsNeeded)
} else {
println(er.Error())
}
}
fmt.Println(" SigScript:", p2sh)
for i := range ss {
if p2sh && i == len(ss)-1 {
// Print p2sh script
d, _ = hex.DecodeString(ss[i])
s2, er := btc.ScriptToText(d)
if er != nil {
println(er.Error())
p2sh = false
fmt.Println(" ", ss[i])
continue
//return
}
fmt.Println(" P2SH spend script:")
for j := range s2 {
fmt.Println(" ", s2[j])
}
} else {
fmt.Println(" ", ss[i])
}
}
return true
}
// reorder signatures to meet order of the keys
// remove signatuers made by the same keys
// remove exessive signatures (keeps transaction size down)
func multisig_reorder(tx *btc.Tx) (all_signed bool) {
all_signed = true
for i := range tx.TxIn {
ms, _ := btc.NewMultiSigFromScript(tx.TxIn[i].ScriptSig)
if ms == nil {
continue
}
hash := tx.SignatureHash(ms.P2SH(), i, btc.SIGHASH_ALL)
var sigs []*btc.Signature
for ki := range ms.PublicKeys {
var sig *btc.Signature
for si := range ms.Signatures {
if btc.EcdsaVerify(ms.PublicKeys[ki], ms.Signatures[si].Bytes(), hash) {
//fmt.Println("Key number", ki, "has signature number", si)
sig = ms.Signatures[si]
break
}
}
if sig != nil {
sigs = append(sigs, sig)
} else if *verbose {
fmt.Println("WARNING: Key number", ki, "has no matching signature")
}
if !*allowextramsigns && uint(len(sigs)) >= ms.SigsNeeded {
break
}
}
if *verbose {
if len(ms.Signatures) > len(sigs) {
fmt.Println("WARNING: Some signatures are obsolete and will be removed", len(ms.Signatures), "=>", len(sigs))
} else if len(ms.Signatures) < len(sigs) {
fmt.Println("It appears that same key is re-used.", len(sigs)-len(ms.Signatures), "more signatures were added")
}
}
ms.Signatures = sigs
tx.TxIn[i].ScriptSig = ms.Bytes()
if len(sigs) < int(ms.SigsNeeded) {
all_signed = false
}
}
return
}
// sign a multisig transaction with a specific key
func multisig_sign() {
tx := raw_tx_from_file(*rawtx)
if tx == nil {
println("ERROR: Cannot decode the raw multisig transaction")
println("Always use -msign <addr> along with -raw multi2sign.txt")
return
}
k := address_to_key(*multisign)
if k == nil {
println("You do not know a key for address", *multisign)
return
}
for i := range tx.TxIn {
ms, er := btc.NewMultiSigFromScript(tx.TxIn[i].ScriptSig)
if er != nil {
println("WARNING: Input", i, "- not multisig:", er.Error())
continue
}
hash := tx.SignatureHash(ms.P2SH(), i, btc.SIGHASH_ALL)
//fmt.Println("Input number", i, len(ms.Signatures), " - hash to sign:", hex.EncodeToString(hash))
r, s, e := btc.EcdsaSign(k.Key, hash)
if e != nil {
println(e.Error())
return
}
btcsig := &btc.Signature{HashType: 0x01}
btcsig.R.Set(r)
btcsig.S.Set(s)
ms.Signatures = append(ms.Signatures, btcsig)
tx.TxIn[i].ScriptSig = ms.Bytes()
}
// Now re-order the signatures as they shall be:
multisig_reorder(tx)
write_tx_file(tx)
}
// prepare a signed transaction
func sign_tx(tx *btc.Tx) (all_signed bool) {
var multisig_done bool
all_signed = true
// go through each input
for in := range tx.TxIn {
if ms, _ := btc.NewMultiSigFromScript(tx.TxIn[in].ScriptSig); ms != nil {
hash := tx.SignatureHash(ms.P2SH(), in, btc.SIGHASH_ALL)
for ki := range ms.PublicKeys {
k := public_to_key(ms.PublicKeys[ki])
if k != nil {
r, s, e := btc.EcdsaSign(k.Key, hash)
if e != nil {
println("ERROR in sign_tx:", e.Error())
all_signed = false
} else {
btcsig := &btc.Signature{HashType: 0x01}
btcsig.R.Set(r)
btcsig.S.Set(s)
ms.Signatures = append(ms.Signatures, btcsig)
tx.TxIn[in].ScriptSig = ms.Bytes()
multisig_done = true
}
}
}
} else {
uo := getUO(&tx.TxIn[in].Input)
if uo == nil {
println("ERROR: Unkown input:", tx.TxIn[in].Input.String(), "- missing balance folder?")
all_signed = false
continue
}
adr := addr_from_pkscr(uo.Pk_script)
if adr == nil {
fmt.Println("WARNING: Don't know how to sign input number", in)
fmt.Println(" Pk_script:", hex.EncodeToString(uo.Pk_script))
all_signed = false
continue
}
k := hash_to_key(adr.Hash160)
if k == nil {
fmt.Println("WARNING: You do not have key for", adr.String(), "at input", in)
all_signed = false
continue
}
er := tx.Sign(in, uo.Pk_script, btc.SIGHASH_ALL, k.BtcAddr.Pubkey, k.Key)
if er != nil {
fmt.Println("ERROR: Sign failed for input number", in, er.Error())
all_signed = false
}
}
}
// reorder signatures if we signed any multisig inputs
if multisig_done && !multisig_reorder(tx) {
all_signed = false
}
if !all_signed {
fmt.Println("WARNING: Not all the inputs have been signed")
}
return
}