package utils

import (
	"crypto/cipher"
	"crypto/des"
)

//des加密
func CBCDesEncrypt(key, iv, plainText []byte) ([]byte, error) {
	block, err := des.NewCipher(key)
	if err != nil {
		return nil, err
	}

	blockSize := block.BlockSize()
	origData := pkcs5Padding(plainText, blockSize)
	blockMode := cipher.NewCBCEncrypter(block, iv)
	cryted := make([]byte, len(origData))
	blockMode.CryptBlocks(cryted, origData)
	return cryted, nil
}

//des解密
func CBCDesDecrypt(key, iv, cipherText []byte) ([]byte, error) {
	block, err := des.NewCipher(key)
	if err != nil {
		return nil, err
	}

	blockMode := cipher.NewCBCDecrypter(block, iv)
	origData := make([]byte, len(cipherText))
	blockMode.CryptBlocks(origData, cipherText)
	origData = pkcs5UnPadding(origData)
	return origData, nil
}