【Unity】「DES」数据加密解密

游戏开发，有一点很重要，就是数据加密
数据加密的方式种类有很多
下面我们实现下 DES加密

---

定义秘钥

        //加解密密钥,可自行替换
        protected static string tmpDESkey = "gBPZodCkn6T";
         // Create sha256 hash
        static SHA256 mySHA256 = SHA256Managed.Create();
        protected  static byte[] basekey = mySHA256.ComputeHash(Encoding.ASCII.GetBytes(tmpDESkey));
        // Create secret IV
        protected static byte[] baseiv = new byte[16] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };

加密

        #region DESEnCode DES加密   
        public static string DESEnCode (string plainText)
        {
            byte[] key=basekey;
            byte[] iv=baseiv;
           
            Aes encryptor = Aes.Create();

            encryptor.Mode = CipherMode.CBC;

            // Set key and IV
            byte[] aesKey = new byte[32];
            Array.Copy(key, 0, aesKey, 0, 32);
            encryptor.Key = aesKey;
            encryptor.IV = iv;

            // Instantiate a new MemoryStream object to contain the encrypted bytes
            MemoryStream memoryStream = new MemoryStream();

            // Instantiate a new encryptor from our Aes object
            ICryptoTransform aesEncryptor = encryptor.CreateEncryptor();

            // Instantiate a new CryptoStream object to process the data and write it to the 
            // memory stream
            CryptoStream cryptoStream = new CryptoStream(memoryStream, aesEncryptor, CryptoStreamMode.Write);

            // Convert the plainText string into a byte array
            byte[] plainBytes = Encoding.ASCII.GetBytes(plainText);

            // Encrypt the input plaintext string
            cryptoStream.Write(plainBytes, 0, plainBytes.Length);

            // Complete the encryption process
            cryptoStream.FlushFinalBlock();

            // Convert the encrypted data from a MemoryStream to a byte array
            byte[] cipherBytes = memoryStream.ToArray();

            // Close both the MemoryStream and the CryptoStream
            memoryStream.Close();
            cryptoStream.Close();

            // Convert the encrypted byte array to a base64 encoded string
            string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);

            // Return the encrypted data as a string
             return cipherText;

        }
        #endregion

解密

        #region DESDeCode DES解密
        //public static  string DESDeCode(string pToDecrypt, string sKey)
        public static string DESDeCode(string cipherText)
        {
            byte[] key=basekey;
            byte[] iv=baseiv;
            
            // Instantiate a new Aes object to perform string symmetric encryption
            Aes encryptor = Aes.Create();

            encryptor.Mode = CipherMode.CBC;

            // Set key and IV
            byte[] aesKey = new byte[32];
            Array.Copy(key, 0, aesKey, 0, 32);
            encryptor.Key = aesKey;
            encryptor.IV = iv;

            // Instantiate a new MemoryStream object to contain the encrypted bytes
            MemoryStream memoryStream = new MemoryStream();

            // Instantiate a new encryptor from our Aes object
            ICryptoTransform aesDecryptor = encryptor.CreateDecryptor();

            // Instantiate a new CryptoStream object to process the data and write it to the 
            // memory stream
            CryptoStream cryptoStream = new CryptoStream(memoryStream, aesDecryptor, CryptoStreamMode.Write);

            // Will contain decrypted plaintext
            string plainText = String.Empty;

            try
            {
                // Convert the ciphertext string into a byte array
                byte[] cipherBytes = Convert.FromBase64String(cipherText);

                // Decrypt the input ciphertext string
                cryptoStream.Write(cipherBytes, 0, cipherBytes.Length);

                // Complete the decryption process
                cryptoStream.FlushFinalBlock();

                // Convert the decrypted data from a MemoryStream to a byte array
                byte[] plainBytes = memoryStream.ToArray();

                // Convert the decrypted byte array to string
                plainText = Encoding.ASCII.GetString(plainBytes, 0, plainBytes.Length);
            }
            finally
            {
                // Close both the MemoryStream and the CryptoStream
                memoryStream.Close();
                cryptoStream.Close();
            }

            // Return the decrypted data as a string
            return plainText;
        }
        #endregion