Go语言的DES加密(CBC模式, ECB模式) ---- 与java加密互通（转）

码
//ECB加密
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()
    //对明文数据进行补码
    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 {
        //对明文按照blocksize进行分块加密
        //必要时可以使用go关键字进行并行加密
        block.Encrypt(dst, data[:bs])
        data = data[bs:]
        dst = dst[bs:]
    }
    return fmt.Sprintf("%X", out)
}

//ECB解密
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)
}

//CBC加密
func EncryptDES_CBC(src, key string) string {
	data := []byte(src)
	keyByte := []byte(key)
	block, err := des.NewCipher(keyByte )
	if err != nil {
		panic(err)
	}
	data = PKCS5Padding(data , block.BlockSize())
	//获取CBC加密模式
	iv := keyByte //用密钥作为向量(不建议这样使用)
	mode := cipher.NewCBCEncrypter(block, iv)
	out := make([]byte, len(data))
	mode .CryptBlocks(out, data)
	return fmt.Sprintf("%X", out)
}

//CBC解密
func DecryptDES_CBC(src, key string) string {
	keyByte := []byte(key)
	data, err := hex.DecodeString(src)
	if err != nil {
		panic(err)
	}
	block, err := des.NewCipher(keyByte)
	if err != nil {
		panic(err)
	}
	iv := keyByte //用密钥作为向量(不建议这样使用)
	mode := cipher.NewCBCDecrypter(block, iv)
	plaintext := make([]byte, len(data))
	mode.CryptBlocks(plaintext, data)
	plaintext = PKCS5UnPadding(plaintext)
	return string(plaintext)
}


//明文补码算法
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
	padding := blockSize - len(ciphertext)%blockSize
	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
	return append(ciphertext, padtext...)
}
//明文减码算法
func PKCS5UnPadding(origData []byte) []byte {
	length := len(origData)
	unpadding := int(origData[length-1])
	return origData[:(length - unpadding)]
}