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package main
import (
'bytes'
'fmt'
'math/big'
)
var base58= []byte('123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz')
func Base58Encoding(str string) string { //Base58編碼
//1. 轉(zhuǎn)換成ascii碼對(duì)應(yīng)的值
strByte := []byte(str)
//fmt.Println(strByte) // 結(jié)果[70 97 110]
//2. 轉(zhuǎn)換十進(jìn)制
strTen := big.NewInt(0).SetBytes(strByte)
//fmt.Println(strTen) // 結(jié)果4612462
//3. 取出余數(shù)
var modSlice []byte
for strTen.Cmp(big.NewInt(0)) > 0 {
mod:=big.NewInt(0) //余數(shù)
strTen58:=big.NewInt(58)
strTen.DivMod(strTen,strTen58,mod) //取余運(yùn)算
modSlice = append(modSlice, base58[mod.Int64()]) //存儲(chǔ)余數(shù),并將對(duì)應(yīng)值放入其中
}
// 處理0就是1的情況 0使用字節(jié)'1'代替
for _,elem := range strByte{
if elem!=0{
break
}else if elem == 0{
modSlice = append(modSlice,byte('1'))
}
}
//fmt.Println(modSlice) //結(jié)果 [12 7 37 23] 但是要進(jìn)行反轉(zhuǎn)，因?yàn)榍笥嗟臅r(shí)候是相反的。
//fmt.Println(string(modSlice)) //結(jié)果D8eQ
ReverseModSlice:=ReverseByteArr(modSlice)
//fmt.Println(ReverseModSlice) //反轉(zhuǎn)[81 101 56 68]
//fmt.Println(string(ReverseModSlice)) //結(jié)果Qe8D
return string(ReverseModSlice)
}
func ReverseByteArr(bytes []byte) []byte{ //將字節(jié)的數(shù)組反轉(zhuǎn)
for i:=0; i<len(bytes)/2 ;i++{
bytes[i],bytes[len(bytes)-1-i] = bytes[len(bytes)-1-i],bytes[i] //前后交換
}
return bytes
}
//就是編碼的逆過程
func Base58Decoding(str string) string { //Base58解碼
strByte := []byte(str)
//fmt.Println(strByte) //[81 101 56 68]
ret := big.NewInt(0)
for _,byteElem := range strByte{
index := bytes.IndexByte(base58,byteElem) //獲取base58對(duì)應(yīng)數(shù)組的下標(biāo)
ret.Mul(ret,big.NewInt(58)) //相乘回去
ret.Add(ret,big.NewInt(int64(index))) //相加
}
//fmt.Println(ret) // 拿到了十進(jìn)制 4612462
//fmt.Println(ret.Bytes()) //[70 97 110]
//fmt.Println(string(ret.Bytes()))
return string(ret.Bytes())
}
func main() {
src := 'Fan'
res := Base58Encoding(src)
fmt.Println(res) //Qe8D
resD:=Base58Decoding(res)
fmt.Println(resD) //Fan
}
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