// version byte for P2KH addresses
func ver_pubkey() byte {
if litecoin {
return ltc.AddrVerPubkey(testnet)
} else {
return btc.AddrVerPubkey(testnet)
}
}
func main() {
var msg []byte
flag.Parse()
if *help || *addr == "" || *sign == "" {
flag.PrintDefaults()
return
}
ad, er := btc.NewAddrFromString(*addr)
if !*litecoin && ad != nil && ad.Version == ltc.AddrVerPubkey(false) {
*litecoin = true
}
if er != nil {
println("Address:", er.Error())
flag.PrintDefaults()
return
}
nv, btcsig, er := btc.ParseMessageSignature(*sign)
if er != nil {
println("ParseMessageSignature:", er.Error())
return
}
if *mess != "" {
msg = []byte(*mess)
} else if *mfil != "" {
msg, er = ioutil.ReadFile(*mfil)
if er != nil {
println(er.Error())
return
}
} else {
fmt.Println("Enter the message:")
msg, _ = ioutil.ReadAll(os.Stdin)
}
if *unix {
fmt.Println("Enforcing Unix text format")
msg = []byte(strings.Replace(string(msg), "\r", "", -1))
}
hash := make([]byte, 32)
if *litecoin {
ltc.HashFromMessage(msg, hash)
} else {
btc.HashFromMessage(msg, hash)
}
compressed := false
if nv >= 31 {
//println("compressed key")
nv -= 4
compressed = true
}
pub := btcsig.RecoverPublicKey(hash[:], int(nv-27))
if pub != nil {
pk := pub.Bytes(compressed)
ok := btc.EcdsaVerify(pk, btcsig.Bytes(), hash)
if ok {
sa := btc.NewAddrFromPubkey(pk, ad.Version)
if ad.Hash160 != sa.Hash160 {
fmt.Println("BAD signature for", ad.String())
os.Exit(1)
} else {
fmt.Println("Good signature for", sa.String())
}
} else {
println("BAD signature")
os.Exit(1)
}
} else {
println("BAD, BAD, BAD signature")
os.Exit(1)
}
}
