Beispiel #1
0
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
}
Beispiel #2
0
// 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
}
Beispiel #3
0
// 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)
}
Beispiel #4
0
// 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
}