DES_ECB 암호화 해독 Golang

package test

import (
	"bytes"
	"crypto/des"
	"encoding/hex"
	"fmt"
	_ "jiami/routers"
	"testing"
)

func TestJiaMi(t *testing.T) {

	key := "1234rfvc"
	input := "lisi123"
	ecb := EncryptDES_ECB(input, key)
	fmt.Println(ecb)
	desEcb := DecryptDES_ECB(ecb, key)
	fmt.Println(desEcb)
}

//ECB 
func EncryptDES_ECB(src, key string) string {
	data := []byte(src)
	keyByte := []byte(key)
	block, err := des.NewCipher(keyByte)
	if err != nil {
		panic(err)
	}
	bs := block.BlockSize()
	// 
	data = PKCS5Padding(data, bs)
	if len(data)%bs != 0 {
		panic("Need a multiple of the blocksize")
	}
	out := make([]byte, len(data))
	dst := out
	for len(data) > 0 {
		// blocksize 
		// go 
		block.Encrypt(dst, data[:bs])
		data = data[bs:]
		dst = dst[bs:]
	}
	return fmt.Sprintf("%X", out)
}

//ECB 
func DecryptDES_ECB(src, key string) string {
	data, err := hex.DecodeString(src)
	if err != nil {
		panic(err)
	}
	keyByte := []byte(key)
	block, err := des.NewCipher(keyByte)
	if err != nil {
		panic(err)
	}
	bs := block.BlockSize()
	if len(data)%bs != 0 {
		panic("crypto/cipher: input not full blocks")
	}
	out := make([]byte, len(data))
	dst := out
	for len(data) > 0 {
		block.Decrypt(dst, data[:bs])
		data = data[bs:]
		dst = dst[bs:]
	}
	out = PKCS5UnPadding(out)
	return string(out)
}

// 
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
	padding := blockSize - len(ciphertext)%blockSize
	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
	return append(ciphertext, padtext...)
}

// 
func PKCS5UnPadding(origData []byte) []byte {
	length := len(origData)
	unpadding := int(origData[length-1])
	return origData[:(length - unpadding)]
}