package main

// reference: https://golang.org/pkg/crypto/des/
// reference: http://blog.studygolang.com/2013/01/go%E5%8A%A0%E5%AF%86%E8%A7%A3%E5%AF%86%E4%B9%8Bdes/

import (
	"crypto/cipher"
	"crypto/des"
	"encoding/base64"
	"encoding/json"
	"fmt"
)

// 3DES解密
func TripleDesDecrypt(crypted, key []byte) ([]byte, error) {
	block, err := des.NewTripleDESCipher(key)
	if err != nil {
		return nil, err
	}
	// note: IV = key[:8]
	blockMode := cipher.NewCBCDecrypter(block, key[:8])
	origData := make([]byte, len(crypted))
	// origData := crypted
	blockMode.CryptBlocks(origData, crypted)
	return origData, nil
}

func main() {
	data := "a6rzP8ogj4bD2woh7tDBk0gBYtyhgzJhxOrvse0f8hyQUem+V9skOnOp4q+81R5Cs+gPDdUxtGFdITLVUaTjVUOQiGD8scBTWVL71F9BQUNjug28kD7RCV1kDHwJWU5ReiaKPnT0EzaYpzeppvWbPPUxXD30iFwLN0y0DMnQYo0PR8XkyMbgEg=="
	raw_data, _ := base64.StdEncoding.DecodeString(data)

	fmt.Println(string(raw_data))
	// encrypted_data := string(raw_data)

	key := []byte("aaaaaaaaaaaaaaaaaaaaaaaa")

	result, _ := TripleDesDecrypt(raw_data, key)
	fmt.Println("result:")
	fmt.Println(string(result))

	var f interface{}
	err := json.Unmarshal(result, &f)
	if err != nil {
		fmt.Println("decode json fail")
	}

}