【Android,加解密】AESUtil加密(Base64,AES嵌套双层加密)

清疚 2022-09-16 12:18 127阅读 0赞

### AESUtil加密: Base64,AES嵌套双层加密 ###

> crazy code (kotlin)

/**
     * @ClassName AESUtil
     * @Description TODO
     * @Author Kolin Zhao/ Mozhimen
     * @Date 2021/10/14 15:13
     * @Version 1.0
     */
    object AESUtil {
        //加密算法
        private const val KEY_ALGORITHM = "AES"
    
        //AES 的 密钥长度，32 字节，范围：16 - 32 字节
        private const val SECURE_KEY_LENGTH = 16
    
        //秘钥长度不足 16 个字节时，默认填充位数
        private const val DEFAULT_VALUE = "0"
    
        //字符编码
        @RequiresApi(Build.VERSION_CODES.KITKAT)
        private val CHARSET_UTF8 = StandardCharsets.UTF_8
    
        //加解密算法/工作模式/填充方式
        private const val CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding"
    
        //key
        private const val SECURE_KEY = "xxxxxForTodo_Key"
    
        //IV
        private const val IV_STRING = "xxxxxForTodo_Iv"
    
        /**
         * 采用AES128加密
         *
         * @param content 要加密的内容
         * @return
         */
        @RequiresApi(Build.VERSION_CODES.KITKAT)
        fun encrypt(content: String): String? {
            try {
                // 获得密匙数据
                val rawKeyData = getAESKey(SECURE_KEY)
                // 从原始密匙数据创建KeySpec对象
                val key = SecretKeySpec(rawKeyData, KEY_ALGORITHM)
                // Cipher对象实际完成加密操作
                val cipher = Cipher.getInstance(CIPHER_ALGORITHM)
                // 用密匙初始化Cipher对象
                val ivParameterSpec = IvParameterSpec(IV_STRING.toByteArray())
                cipher.init(Cipher.ENCRYPT_MODE, key, ivParameterSpec)
                // 正式执行加密操作
                val encryptByte = cipher.doFinal(content.toByteArray())
                return Base64.encodeToString(encryptByte, Base64.NO_WRAP)
            } catch (e: UnsupportedEncodingException) {
                e.printStackTrace()
            } catch (e: NoSuchAlgorithmException) {
                e.printStackTrace()
            } catch (e: NoSuchPaddingException) {
                e.printStackTrace()
            } catch (e: InvalidAlgorithmParameterException) {
                e.printStackTrace()
            } catch (e: InvalidKeyException) {
                e.printStackTrace()
            } catch (e: IllegalBlockSizeException) {
                e.printStackTrace()
            } catch (e: BadPaddingException) {
                e.printStackTrace()
            }
            return null
        }
    
        /**
         * 采用AES128解密
         *
         * @param content
         * @param secureKey
         * @return
         * @throws Exception
         * ,Exception
         * @throws Exception
         */
        @RequiresApi(Build.VERSION_CODES.KITKAT)
        fun decrypt(content: String, secureKey: String): String? {
            val data: ByteArray = Base64.decode(content, Base64.NO_WRAP)
            try {
                // 获得密匙数据
                val rawKeyData = getAESKey(secureKey) // secureKey.getBytes();
                // 从原始密匙数据创建一个KeySpec对象
                val key = SecretKeySpec(rawKeyData, KEY_ALGORITHM)
                // Cipher对象实际完成解密操作
                val cipher = Cipher.getInstance(CIPHER_ALGORITHM)
                // 用密匙初始化Cipher对象
                val initParam = IV_STRING.toByteArray()
                val ivParameterSpec = IvParameterSpec(initParam)
                cipher.init(Cipher.DECRYPT_MODE, key, ivParameterSpec)
                return String(cipher.doFinal(data), CHARSET_UTF8)
            } catch (e: UnsupportedEncodingException) {
                e.printStackTrace()
            } catch (e: NoSuchAlgorithmException) {
                e.printStackTrace()
            } catch (e: NoSuchPaddingException) {
                e.printStackTrace()
            } catch (e: InvalidKeyException) {
                e.printStackTrace()
            } catch (e: InvalidAlgorithmParameterException) {
                e.printStackTrace()
            } catch (e: IllegalBlockSizeException) {
                e.printStackTrace()
            } catch (e: BadPaddingException) {
                e.printStackTrace()
            }
            return null
        }
    
        @RequiresApi(Build.VERSION_CODES.KITKAT)
        @Throws(UnsupportedEncodingException::class)
        fun getAESKey(key: String): ByteArray {
            val keyBytes: ByteArray = key.toByteArray(CHARSET_UTF8)
            val keyBytes16 = ByteArray(SECURE_KEY_LENGTH)
            System.arraycopy(
                keyBytes, 0, keyBytes16, 0,
                keyBytes.size.coerceAtMost(SECURE_KEY_LENGTH)
            )
            return keyBytes16
        }
    }