/
address.go
278 lines (249 loc) · 6.31 KB
/
address.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package address 计算地址相关的函数
package address
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"errors"
"unsafe"
"github.com/33cn/chain33/common"
"github.com/decred/base58"
lru "github.com/hashicorp/golang-lru"
)
var addrSeed = []byte("address seed bytes for public key")
var addressCache *lru.Cache
var pubkey2AddrCache *lru.Cache
var checkAddressCache *lru.Cache
var multisignCache *lru.Cache
var multiCheckAddressCache *lru.Cache
var execPubKeyCache *lru.Cache
// ErrCheckVersion :
var ErrCheckVersion = errors.New("check version error")
//ErrCheckChecksum :
var ErrCheckChecksum = errors.New("Address Checksum error")
//ErrAddressChecksum :
var ErrAddressChecksum = errors.New("address checksum error")
//MaxExecNameLength 执行器名最大长度
const MaxExecNameLength = 100
//NormalVer 普通地址的版本号
var NormalVer byte
//MultiSignVer 多重签名地址的版本号
var MultiSignVer byte = 5
func init() {
var err error
multisignCache, err = lru.New(10240)
if err != nil {
panic(err)
}
pubkey2AddrCache, err = lru.New(10240)
if err != nil {
panic(err)
}
addressCache, err = lru.New(10240)
if err != nil {
panic(err)
}
checkAddressCache, err = lru.New(10240)
if err != nil {
panic(err)
}
multiCheckAddressCache, err = lru.New(10240)
if err != nil {
panic(err)
}
execPubKeyCache, err = lru.New(10240)
if err != nil {
panic(err)
}
}
//ExecAddress 计算量有点大,做一次cache
func ExecAddress(name string) string {
if value, ok := addressCache.Get(name); ok {
return value.(string)
}
addr := GetExecAddress(name)
addrstr := addr.String()
addressCache.Add(name, addrstr)
return addrstr
}
//MultiSignAddress create a multi sign address
func MultiSignAddress(pubkey []byte) string {
skey := *(*string)(unsafe.Pointer(&pubkey))
if value, ok := multisignCache.Get(skey); ok {
return value.(string)
}
addr := HashToAddress(MultiSignVer, pubkey)
addrstr := addr.String()
multisignCache.Add(string(pubkey), addrstr)
return addrstr
}
//ExecPubKey 计算公钥
func ExecPubKey(name string) []byte {
if len(name) > MaxExecNameLength {
panic("name too long")
}
if value, ok := execPubKeyCache.Get(name); ok {
return value.([]byte)
}
var bname [200]byte
buf := append(bname[:0], addrSeed...)
buf = append(buf, []byte(name)...)
hash := common.Sha2Sum(buf)
execPubKeyCache.Add(name, hash)
return hash[:]
}
//GetExecAddress 获取地址
func GetExecAddress(name string) *Address {
hash := ExecPubKey(name)
addr := PubKeyToAddress(hash[:])
return addr
}
//PubKeyToAddress 公钥转为地址
func PubKeyToAddress(in []byte) *Address {
return HashToAddress(NormalVer, in)
}
//PubKeyToAddr 公钥转为地址
func PubKeyToAddr(in []byte) string {
instr := *(*string)(unsafe.Pointer(&in))
if value, ok := pubkey2AddrCache.Get(instr); ok {
return value.(string)
}
addr := HashToAddress(NormalVer, in).String()
pubkey2AddrCache.Add(string(in), addr)
return addr
}
//HashToAddress hash32 to address
func HashToAddress(version byte, in []byte) *Address {
a := new(Address)
a.Pubkey = make([]byte, len(in))
copy(a.Pubkey[:], in[:])
a.Version = version
a.SetBytes(common.Rimp160(in))
return a
}
func checksum(input []byte) (cksum [4]byte) {
h := sha256.Sum256(input)
h2 := sha256.Sum256(h[:])
copy(cksum[:], h2[:4])
return
}
func checkAddress(ver byte, addr string) (e error) {
dec := base58.Decode(addr)
if dec == nil {
e = errors.New("Cannot decode b58 string '" + addr + "'")
checkAddressCache.Add(addr, e)
return
}
if len(dec) < 25 {
e = errors.New("Address too short " + hex.EncodeToString(dec))
checkAddressCache.Add(addr, e)
return
}
//version 的错误优先
if dec[0] != ver {
e = ErrCheckVersion
return
}
//需要兼容以前的错误(以前的错误,是一种特殊的情况)
if len(dec) == 25 {
sh := common.Sha2Sum(dec[0:21])
if !bytes.Equal(sh[:4], dec[21:25]) {
e = ErrCheckChecksum
return
}
}
var cksum [4]byte
copy(cksum[:], dec[len(dec)-4:])
//新的错误: 这个错误用一种新的错误标记
if checksum(dec[:len(dec)-4]) != cksum {
e = ErrAddressChecksum
}
return e
}
//CheckMultiSignAddress 检查多重签名地址的有效性
func CheckMultiSignAddress(addr string) (e error) {
if value, ok := multiCheckAddressCache.Get(addr); ok {
if value == nil {
return nil
}
return value.(error)
}
e = checkAddress(MultiSignVer, addr)
multiCheckAddressCache.Add(addr, e)
return
}
//CheckAddress 检查地址
func CheckAddress(addr string) (e error) {
if value, ok := checkAddressCache.Get(addr); ok {
if value == nil {
return nil
}
return value.(error)
}
e = checkAddress(NormalVer, addr)
checkAddressCache.Add(addr, e)
return
}
//NewAddrFromString new 地址
func NewAddrFromString(hs string) (a *Address, e error) {
dec := base58.Decode(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 := common.Sha2Sum(dec[0:21])
if !bytes.Equal(sh[:4], dec[21:25]) {
e = ErrCheckChecksum
} else {
a = new(Address)
a.Version = dec[0]
copy(a.Hash160[:], dec[1:21])
a.Checksum = make([]byte, 4)
copy(a.Checksum, dec[21:25])
a.Enc58str = hs
}
}
return
}
//Address 地址
type Address struct {
Version byte
Hash160 [20]byte // For a stealth address: it's HASH160
Checksum []byte // Unused for a stealth address
Pubkey []byte // Unused for a stealth address
Enc58str string
}
//SetBytes 设置地址的bytes
func (a *Address) SetBytes(b []byte) {
copy(a.Hash160[:], b)
}
func (a *Address) String() string {
if a.Enc58str == "" {
var ad [25]byte
ad[0] = a.Version
copy(ad[1:21], a.Hash160[:])
if a.Checksum == nil {
sh := common.Sha2Sum(ad[0:21])
a.Checksum = make([]byte, 4)
copy(a.Checksum, sh[:4])
}
copy(ad[21:25], a.Checksum[:])
a.Enc58str = base58.Encode(ad[:])
}
return a.Enc58str
}
//SetNormalAddrVer 根据配置设置生成普通地址的version版本号,默认是0
func SetNormalAddrVer(ver byte) {
if MultiSignVer == ver {
panic("the version of the normal address conflicts with the version of the multi-signature address!")
}
NormalVer = ver
}