// 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 { if *verb { fmt.Println("Enter the message:") } msg, _ = ioutil.ReadAll(os.Stdin) } if *unix { if *verb { fmt.Println("Enforcing Unix text format") } msg = bytes.Replace(msg, []byte{'\r'}, nil, -1) } hash := make([]byte, 32) if *litecoin { ltc.HashFromMessage(msg, hash) } else { btc.HashFromMessage(msg, hash) } compressed := false if nv >= 31 { if *verb { fmt.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()) if bytes.IndexByte(msg, '\r') != -1 { fmt.Println("You have CR chars in the message. Try to verify with -u switch.") } os.Exit(1) } else { fmt.Println("Signature OK") } } else { println("BAD signature") os.Exit(1) } } else { println("BAD, BAD, BAD signature") os.Exit(1) } }