// this function signs either a message or a raw transaction hash
func sign_message() {
var hash []byte
if *signhash != "" {
var er error
hash, er = hex.DecodeString(*signhash)
if er != nil {
println("Incorrect content of -hash parameter")
println(er.Error())
return
}
}
ad2s, e := btc.NewAddrFromString(*signaddr)
if e != nil {
println(e.Error())
if *signhash != "" {
println("Always use -sign <addr> along with -hash <msghash>")
}
return
}
var privkey []byte
var compr bool
for i := range publ_addrs {
if publ_addrs[i].Hash160 == ad2s.Hash160 {
privkey = priv_keys[i][:]
compr = compressed_key[i]
// Sign raw hash?
if hash != nil {
txsig := new(btc.Signature)
txsig.HashType = 0x01
r, s, e := btc.EcdsaSign(privkey, hash)
if e != nil {
println(e.Error())
return
}
txsig.R.Set(r)
txsig.S.Set(s)
fmt.Println("PublicKey:", hex.EncodeToString(publ_addrs[i].Pubkey))
fmt.Println(hex.EncodeToString(txsig.Bytes()))
return
}
break
}
}
if privkey == nil {
println("You do not have a private key for", ad2s.String())
return
}
var msg []byte
if *message == "" {
msg, _ = ioutil.ReadAll(os.Stdin)
} else {
msg = []byte(*message)
}
hash = make([]byte, 32)
btc.HashFromMessage(msg, hash)
btcsig := new(btc.Signature)
var sb [65]byte
sb[0] = 27
if compr {
sb[0] += 4
}
r, s, e := btc.EcdsaSign(privkey, hash)
if e != nil {
println(e.Error())
return
}
btcsig.R.Set(r)
btcsig.S.Set(s)
rd := btcsig.R.Bytes()
sd := btcsig.S.Bytes()
copy(sb[1+32-len(rd):], rd)
copy(sb[1+64-len(sd):], sd)
rpk := btcsig.RecoverPublicKey(hash[:], 0)
sa := btc.NewAddrFromPubkey(rpk.Bytes(compr), ad2s.Version)
if sa.Hash160 == ad2s.Hash160 {
fmt.Println(base64.StdEncoding.EncodeToString(sb[:]))
return
}
rpk = btcsig.RecoverPublicKey(hash[:], 1)
sa = btc.NewAddrFromPubkey(rpk.Bytes(compr), ad2s.Version)
if sa.Hash160 == ad2s.Hash160 {
sb[0]++
fmt.Println(base64.StdEncoding.EncodeToString(sb[:]))
return
}
println("Something went wrong. The message has not been signed.")
}
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
}
ad2s, e := btc.NewAddrFromString(*multisign)
if e != nil {
println("BTC addr:", e.Error())
return
}
var privkey *ecdsa.PrivateKey
//var compr bool
for i := range publ_addrs {
if publ_addrs[i].Hash160 == ad2s.Hash160 {
privkey = new(ecdsa.PrivateKey)
pub, e := btc.NewPublicKey(publ_addrs[i].Pubkey)
if e != nil {
println("PubKey:", e.Error())
return
}
privkey.PublicKey = pub.PublicKey
privkey.D = new(big.Int).SetBytes(priv_keys[i][:])
//compr = compressed_key[i]
break
}
}
if privkey == nil {
println("You do not know a key for address", ad2s.String())
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))
btcsig := &btc.Signature{HashType: 0x01}
btcsig.R, btcsig.S, e = btc.EcdsaSign(privkey, hash)
if e != nil {
println(e.Error())
return
}
ms.Signatures = append(ms.Signatures, btcsig)
tx.TxIn[i].ScriptSig = ms.Bytes()
}
// Now re-order the signatures as they shall be:
for i := range tx.TxIn {
ms, er := btc.NewMultiSigFromScript(tx.TxIn[i].ScriptSig)
if er != nil {
//println(er.Error())
continue
}
hash := tx.SignatureHash(ms.P2SH(), i, btc.SIGHASH_ALL)
//fmt.Println("Input number", i, " - hash to sign:", hex.EncodeToString(hash))
//fmt.Println(" ... number of signatures:", len(ms.Signatures))
var sigs []*btc.Signature
for ki := range ms.PublicKeys {
//pk := btc.NewPublicKey(ms.PublicKeys[ki])
//fmt.Println(ki, hex.EncodeToString(ms.PublicKeys[ki]))
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 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()
}
write_tx_file(tx)
}
func sign_message() {
ad2s, e := btc.NewAddrFromString(*signaddr)
if e != nil {
println(e.Error())
return
}
var privkey *ecdsa.PrivateKey
for i := range publ_addrs {
if publ_addrs[i].Hash160 == ad2s.Hash160 {
privkey = new(ecdsa.PrivateKey)
pub, e := btc.NewPublicKey(publ_addrs[i].Pubkey)
if e != nil {
println(e.Error())
return
}
privkey.PublicKey = pub.PublicKey
privkey.D = new(big.Int).SetBytes(priv_keys[i][:])
break
}
}
if privkey == nil {
println("You do not have a private key for", ad2s.String())
return
}
var msg []byte
if *message == "" {
msg, _ = ioutil.ReadAll(os.Stdin)
} else {
msg = []byte(*message)
}
hash := make([]byte, 32)
btc.HashFromMessage(msg, hash)
btcsig := new(btc.Signature)
var sb [65]byte
sb[0] = 27
if !*uncompressed {
sb[0] += 4
}
btcsig.R, btcsig.S, e = btc.EcdsaSign(privkey, hash)
if e != nil {
println(e.Error())
return
}
rd := btcsig.R.Bytes()
sd := btcsig.S.Bytes()
copy(sb[1+32-len(rd):], rd)
copy(sb[1+64-len(sd):], sd)
rpk := btcsig.RecoverPublicKey(hash[:], 0)
sa := btc.NewAddrFromPubkey(rpk.Bytes(!*uncompressed), ad2s.Version)
if sa.Hash160 == ad2s.Hash160 {
fmt.Println(base64.StdEncoding.EncodeToString(sb[:]))
return
}
rpk = btcsig.RecoverPublicKey(hash[:], 1)
sa = btc.NewAddrFromPubkey(rpk.Bytes(!*uncompressed), ad2s.Version)
if sa.Hash160 == ad2s.Hash160 {
sb[0]++
fmt.Println(base64.StdEncoding.EncodeToString(sb[:]))
return
}
println("Something went wrong. The message has not been signed.")
}