AzDG可逆加密演算法 for Go

Google 新推的 Go 語言還滿易學的，看了一些 http://golang.org/ 線上文件, 
花了二個小時就把 AzDG 可逆加密演算法遷移到 Go 語言上。 
AzDG  中有使用到 base64、md5，看本例後就知道怎使....... 
Objective-C還真不易學習。

package main

import (
    "fmt"
    "crypto/md5"
    "encoding/base64"
    "time"
)

var cipher = "密鑰"
var h = md5.New()

func cipherEncode(sourceText string) string {   
    h.Write([]byte(cipher))
    cipherHash := fmt.Sprintf("%x", h.Sum(nil))
    h.Reset()
    inputData := []byte(sourceText)
    loopCount := len(inputData)
    outData := make([]byte,loopCount)
    for i:= 0; i < loopCount ; i++ {
        outData[i] = inputData[i] ^ cipherHash[i%32]
    }   
    return fmt.Sprintf("%s", outData)
}

func encode(sourceText string) string { 
    h.Write([]byte(time.Now().Format("2006-01-02 15:04:05")))
    noise := fmt.Sprintf("%x", h.Sum(nil))
    h.Reset()
    inputData := []byte(sourceText)
    loopCount := len(inputData)
    outData := make([]byte,loopCount*2)
    
    for i, j := 0,0; i < loopCount ; i,j = i+1,j+1 {        
        outData[j] = noise[i%32]
        j++
        outData[j] = inputData[i] ^ noise[i%32]
    }
    
    return base64.StdEncoding.EncodeToString([]byte(cipherEncode(fmt.Sprintf("%s", outData))))
}

func decode(sourceText string) string {
    buf, err := base64.StdEncoding.DecodeString(sourceText)
    if err != nil {
        fmt.Println("Decode(%q) failed: %v", sourceText, err)
        return ""
    }
    inputData := []byte(cipherEncode(fmt.Sprintf("%s", buf)))
    loopCount := len(inputData)
    outData := make([]byte,loopCount)
    for i, j := 0,0; i < loopCount ; i,j = i+2,j+1 {        
        outData[j] = inputData[i] ^ inputData[i+1]
    }
    return fmt.Sprintf("%s", outData)
}

func main() {
    s := encode("張學友")
    fmt.Println(s)
    fmt.Println(decode(s))
}