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 = ecdsa_Sign(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.")
}
// 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.")
}