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address.go
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address.go
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/*
* Copyright (C) 2018 The ZeepinChain Authors
* This file is part of The ZeepinChain library.
*
* The ZeepinChain is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ZeepinChain is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ZeepinChain. If not, see <http://www.gnu.org/licenses/>.
*/
package common
import (
"crypto/sha256"
"errors"
"fmt"
"io"
"math/big"
"github.com/itchyny/base58-go"
)
const ADDR_LEN = 20
type Address [ADDR_LEN]byte
var ADDRESS_EMPTY = Address{}
var ADDR_PREFIX = byte(80)
// ToHexString returns hex string representation of Address
func (self *Address) ToHexString() string {
return fmt.Sprintf("%x", ToArrayReverse(self[:]))
}
// Serialize serialize Address into io.Writer
func (self *Address) Serialize(w io.Writer) error {
_, err := w.Write(self[:])
return err
}
// Deserialize deserialize Address from io.Reader
func (self *Address) Deserialize(r io.Reader) error {
_, err := io.ReadFull(r, self[:])
if err != nil {
return errors.New("deserialize Address error")
}
return nil
}
// ToBase58 returns base58 encoded address string
func (f *Address) ToBase58() string {
data := append([]byte{ADDR_PREFIX}, f[:]...)
temp := sha256.Sum256(data)
//temps := sha256.Sum256(temp[:])
data = append(data, temp[0:4]...)
bi := new(big.Int).SetBytes(data).String()
encoded, _ := base58.BitcoinEncoding.Encode([]byte(bi))
return string(encoded)
}
// AddressParseFromBytes returns parsed Address
func AddressParseFromBytes(f []byte) (Address, error) {
if len(f) != ADDR_LEN {
return ADDRESS_EMPTY, errors.New("[Common]: AddressParseFromBytes err, len != 20")
}
var addr Address
copy(addr[:], f)
return addr, nil
}
// AddressParseFromHexString returns parsed Address
func AddressFromHexString(s string) (Address, error) {
hx, err := HexToBytes(s)
if err != nil {
return ADDRESS_EMPTY, err
}
return AddressParseFromBytes(ToArrayReverse(hx))
}
// AddressFromBase58 returns Address from encoded base58 string
func AddressFromBase58(encoded string) (Address, error) {
if encoded == "" {
return ADDRESS_EMPTY, fmt.Errorf("invalid address")
}
decoded, err := base58.BitcoinEncoding.Decode([]byte(encoded))
if err != nil {
return ADDRESS_EMPTY, err
}
x, ok := new(big.Int).SetString(string(decoded), 10)
if !ok {
return ADDRESS_EMPTY, fmt.Errorf("invalid address")
}
buf := x.Bytes()
if len(buf) != 1+ADDR_LEN+4 || buf[0] != byte(ADDR_PREFIX) {
return ADDRESS_EMPTY, errors.New("wrong encoded address")
}
ph, err := AddressParseFromBytes(buf[1:21])
if err != nil {
return ADDRESS_EMPTY, err
}
addr := ph.ToBase58()
if addr != encoded {
return ADDRESS_EMPTY, errors.New("[AddressFromBase58]: decode encoded verify failed.")
}
return ph, nil
}