1. static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)
  2. {
  3. // Check arguments.
  4. if (plainText == null || plainText.Length <= 0)
  5. throw new ArgumentNullException("plainText");
  6. if (Key == null || Key.Length <= 0)
  7. throw new ArgumentNullException("Key");
  8. if (IV == null || IV.Length <= 0)
  9. throw new ArgumentNullException("Key");
  10. byte[] encrypted;
  11. // Create an AesManaged object
  12. // with the specified key and IV.
  13. using (AesManaged aesAlg = new AesManaged())
  14. {
  15. aesAlg.Key = Key;
  16. aesAlg.IV = IV;
  17. aesAlg.Mode = CipherMode.CBC;
  18. // Create a decrytor to perform the stream transform.
  19. ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
  21. // Create the streams used for encryption.
  22. using (MemoryStream msEncrypt = new MemoryStream())
  23. {
  24. using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
  25. {
  26. using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
  27. {
  29. //Write all data to the stream.
  30. swEncrypt.Write(plainText);
  31. }
  32. encrypted = msEncrypt.ToArray();
  33. }
  34. }
  35. }
  38. // Return the encrypted bytes from the memory stream.
  39. return encrypted;
  41. }
  43. static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
  44. {
  45. // Check arguments.
  46. if (cipherText == null || cipherText.Length <= 0)
  47. throw new ArgumentNullException("cipherText");
  48. if (Key == null || Key.Length <= 0)
  49. throw new ArgumentNullException("Key");
  50. if (IV == null || IV.Length <= 0)
  51. throw new ArgumentNullException("Key");
  53. // Declare the string used to hold
  54. // the decrypted text.
  55. string plaintext = null;
  57. // Create an AesManaged object
  58. // with the specified key and IV.
  59. using (AesManaged aesAlg = new AesManaged())
  60. {
  61. aesAlg.Key = Key;
  62. aesAlg.IV = IV;
  63. aesAlg.Mode = CipherMode.CBC;
  64. // Create a decrytor to perform the stream transform.
  65. ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
  67. // Create the streams used for decryption.
  68. using (MemoryStream msDecrypt = new MemoryStream(cipherText))
  69. {
  70. using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
  71. {
  72. using (StreamReader srDecrypt = new StreamReader(csDecrypt))
  73. {
  75. // Read the decrypted bytes from the decrypting stream
  76. // and place them in a string.
  77. plaintext = srDecrypt.ReadToEnd();
  78. }
  79. }
  80. }
  82. }
  84. return plaintext;
  86. }