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package main

import (
"math/big"
"fmt"
)

//切片存儲(chǔ)base58字母
var b58Alphabet = []byte("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")


func Base58Encode(input []byte) []byte{
//定義一個(gè)字節(jié)切片，返回值
var result []byte

//把字節(jié)數(shù)組input轉(zhuǎn)化為了大整數(shù)big.Int
x:= big.NewInt(0).SetBytes(input)

//長度58的大整數(shù)
base := big.NewInt(int64(len(b58Alphabet)))
 //0的大整數(shù)
zero := big.NewInt(0)
//大整數(shù)的指針
mod := &big.Int{}

 //循環(huán)，不停地對x取余數(shù),大小為58
for x.Cmp(zero) != 0 {
x.DivMod(x,base,mod)  // 對x取余數(shù)

   //講余數(shù)添加到數(shù)組當(dāng)中
result =  append(result, b58Alphabet[mod.Int64()])
}


//反轉(zhuǎn)字節(jié)數(shù)組
ReverseBytes(result)

//如果這個(gè)字節(jié)數(shù)組的前面為字節(jié)0，會(huì)把它替換為1.
for _,b:=range input{

if b ==0x00{
	result =  append([]byte{b58Alphabet[0]},result...)
}else{
	break
}
}


return result

}

//反轉(zhuǎn)字節(jié)數(shù)組
func ReverseBytes(data []byte){
for i,j :=0,len(data) - 1;idata[i],data[j] = data[j],data[i]
}
}

//測試 反轉(zhuǎn)操作
func main(){
org := []byte("qwerty")
fmt.Println(string(org))

ReverseBytes(org)

fmt.Println(string(org))
//測試編碼
 fmt.Printf("%s",string( Base58Encode([]byte("hello jonson"))))
}

func Base58Decode(input []byte) []byte{
result :=  big.NewInt(0)
zeroBytes :=0
for _,b :=range input{
if b=='1'{
	zeroBytes++
}else{
	break
}
}

payload:= input[zeroBytes:]

for _,b := range payload{
charIndex := bytes.IndexByte(b58Alphabet,b)  //反推出余數(shù)

result.Mul(result,big.NewInt(58))   //之前的結(jié)果乘以58

result.Add(result,big.NewInt(int64(charIndex)))  //加上這個(gè)余數(shù)

}

decoded :=result.Bytes()


decoded =  append(bytes.Repeat([]byte{0x00},zeroBytes),decoded...)
return decoded
}

package main

import (
"math/big"
"fmt"
"bytes"
)

var b58Alphabet = []byte("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")


func Base58Encode(input []byte) []byte{
var result []byte

x:= big.NewInt(0).SetBytes(input)

base := big.NewInt(int64(len(b58Alphabet)))
zero := big.NewInt(0)

mod := &big.Int{}
for x.Cmp(zero) != 0 {
x.DivMod(x,base,mod)  // 對x取余數(shù)
result =  append(result, b58Alphabet[mod.Int64()])
}



ReverseBytes(result)

for _,b:=range input{

if b ==0x00{
	result =  append([]byte{b58Alphabet[0]},result...)
}else{
	break
}
}


return result

}







func Base58Decode(input []byte) []byte{
result :=  big.NewInt(0)
zeroBytes :=0
for _,b :=range input{
if b=='1'{
	zeroBytes++
}else{
	break
}
}

payload:= input[zeroBytes:]

for _,b := range payload{
charIndex := bytes.IndexByte(b58Alphabet,b)  //反推出余數(shù)

result.Mul(result,big.NewInt(58))   //之前的結(jié)果乘以58

result.Add(result,big.NewInt(int64(charIndex)))  //加上這個(gè)余數(shù)

}

decoded :=result.Bytes()


decoded =  append(bytes.Repeat([]byte{0x00},zeroBytes),decoded...)
return decoded
}





func ReverseBytes(data []byte){
for i,j :=0,len(data) - 1;idata[i],data[j] = data[j],data[i]
}
}

func main(){
org := []byte("qwerty")
fmt.Println(string(org))

ReverseBytes(org)

fmt.Println(string(org))



fmt.Printf("%s\n",string( Base58Encode([]byte("hello jonson"))))




fmt.Printf("%s",string(Base58Decode([]byte("2yGEbwRFyav6CimZ7"))))
}