go DES加密解密

作者: adm 分类: go 发布时间: 2022-05-12 14:56

go DES加密解密

var PwdKey = []byte("DIS**#KKKDJJSKDI")

//PKCS7 填充模式
func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
	padding := blockSize - len(ciphertext)%blockSize
	//Repeat()函数的功能是把切片[]byte{byte(padding)}复制padding个,然后合并成新的字节切片返回
	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
	return append(ciphertext, padtext...)
}

//填充的反向操作,删除填充字符串
func PKCS7UnPadding(origData []byte) ([]byte, error) {
	//获取数据长度
	length := len(origData)
	if length == 0 {
		return nil, errors.New("加密字符串错误!")
	} else {
		//获取填充字符串长度
		unpadding := int(origData[length-1])
		//截取切片,删除填充字节,并且返回明文
		return origData[:(length - unpadding)], nil
	}
}

//实现加密
func AesEcrypt(origData []byte, key []byte) ([]byte, error) {
	//创建加密算法实例
	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}
	//获取块的大小
	blockSize := block.BlockSize()
	//对数据进行填充,让数据长度满足需求
	origData = PKCS7Padding(origData, blockSize)
	//采用AES加密方法中CBC加密模式
	blocMode := cipher.NewCBCEncrypter(block, key[:blockSize])
	crypted := make([]byte, len(origData))
	//执行加密
	blocMode.CryptBlocks(crypted, origData)
	return crypted, nil
}

//实现解密
func AesDeCrypt(cypted []byte, key []byte) ([]byte, error) {
	//创建加密算法实例
	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}
	//获取块大小
	blockSize := block.BlockSize()
	//创建加密客户端实例
	blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
	origData := make([]byte, len(cypted))
	//这个函数也可以用来解密
	blockMode.CryptBlocks(origData, cypted)
	//去除填充字符串
	origData, err = PKCS7UnPadding(origData)
	if err != nil {
		return nil, err
	}
	return origData, err
}

//加密base64
func EnPwdCode(pwd []byte) (string, error) {
	result, err := AesEcrypt(pwd, PwdKey)
	if err != nil {
		return "", err
	}
	return base64.StdEncoding.EncodeToString(result), err
}

//解密
func DePwdCode(pwd string) ([]byte, error) {
	//解密base64字符串
	pwdByte, err := base64.StdEncoding.DecodeString(pwd)
	if err != nil {
		return nil, err
	}
	//执行AES解密
	return AesDeCrypt(pwdByte, PwdKey)

}

test

str1 := []byte("imL_TqY5J0QOXEBFtmTO_OcweHM4Mj_2Q2w7isNx6AulbZMP23-ajmaCxQ3OhMHRNgxTflq5Z__-t5f4PoTebTB23RZnvSoDH3NYtAXSieUM5iuqaLGqtyd6DLN_5kLOWrgU6pezN19o-RQOWp0YMfFkOwhX1Dynojd3x-zW9epK-otDHgzOf_KU7z2v6XdkjynbVw9BYx-1gu-zjcAmkC6aWo2r5Sdig6cmoBYEu0SVsYqYczQxz0VJWngYCo1xC5MO-R9p-i0dGFVDl04yPJexN2igIs-v7mkaIswYxVnYTxYWbzwOo3awL3BK7Wq_yH8f_IGggr5InEGHoLTkeA==")
	pwd, _ := EnPwdCode(str1)
	bytes, _ := DePwdCode(pwd)
	fmt.Println("str1",pwd)
	fmt.Println("str2",string(bytes))

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