func NewAddrFromString(hs string) (a *BtcAddr, e error) {
dec := Decodeb58(hs)
if dec == nil {
e = errors.New("Cannot decode b58 string *" + hs + "*")
return
}
if len(dec) < 25 {
e = errors.New("Address too short " + hex.EncodeToString(dec))
return
}
if len(dec) == 25 {
sh := crypto.Sha2Sum(dec[0:21])
if !bytes.Equal(sh[:4], dec[21:25]) {
e = errors.New("Address Checksum error")
} else {
a = new(BtcAddr)
a.Version = dec[0]
copy(a.Hash160[:], dec[1:21])
a.Checksum = make([]byte, 4)
copy(a.Checksum, dec[21:25])
a.Enc58str = hs
}
} else {
// Stealth Addr
}
return
}
// Base58 encoded address
func (a *BtcAddr) String() string {
if a.Enc58str == "" {
var ad [25]byte
ad[0] = a.Version
copy(ad[1:21], a.Hash160[:])
if a.Checksum == nil {
sh := crypto.Sha2Sum(ad[0:21])
a.Checksum = make([]byte, 4)
copy(a.Checksum, sh[:4])
}
copy(ad[21:25], a.Checksum[:])
a.Enc58str = Encodeb58(ad[:])
}
return a.Enc58str
}