使用 AES 加密與解密字串

2008-04-25

使用 AES 加密與解密字串

參考：

範例程式碼：

   1:  string inputString = "測試文字";

   2:  string password = "p@ssw0rd";

3:

   4:  byte[] binputString = Encoding.UTF8.GetBytes(inputString);

   5:  byte[] saltBytes = Encoding.UTF8.GetBytes("salt string");

6:

   7:  RijndaelManaged aes = new RijndaelManaged();

   8:  Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(password, saltBytes);

9:

  10:  aes.KeySize = 128;

  11:  aes.Key = key.GetBytes(16);

12:

  13:  aes.BlockSize = 128;

  14:  aes.IV = key.GetBytes(16);

15:

  16:  ICryptoTransform encryptor = aes.CreateEncryptor();

  17:  MemoryStream memoryStream = new MemoryStream();

  18:  CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);

19:

  20:  cryptoStream.Write(binputString, 0, binputString.Length);

  21:  cryptoStream.FlushFinalBlock();

  22:  cryptoStream.Close();

23:

  24:  byte[] encryptBytes = memoryStream.ToArray();

  25:  string encryptedData = Convert.ToBase64String(encryptBytes);

26:

  27:  MessageBox.Show(encryptedData);

28:

  29:  ICryptoTransform decryptor = aes.CreateDecryptor();

  30:  encryptBytes = Convert.FromBase64String(encryptedData);

  31:  memoryStream = new MemoryStream();

  32:  cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Write);

33:

  34:  cryptoStream.Write(encryptBytes, 0, encryptBytes.Length);

  35:  cryptoStream.Flush();

  36:  cryptoStream.Close();

37:

  38:  byte[] decryptBytes = memoryStream.ToArray();

  39:  string decryptedData = Encoding.UTF8.GetString(decryptBytes);

  40:  MessageBox.Show(decryptedData);