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Posted By

pckujawa on 06/07/10


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password security encrypt Encryption


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khouser


Encrypting passwords and other sensitive information in .NET

 / Published in: C#
 

URL: http://msdn.microsoft.com/en-us/library/ms229741.aspx

If you want to serialize a password in some custom object you are working with, create another member that is the encrypted bytes and serialize/deserialize that.

For simply encrypting/decrypting a file, you can use System.IO.File.Encrypt/Decrypt.

Expand | Embed | Plain Text 
  1. public static class Security
  2. {
  3.     private static Encoding _encoding = Encoding.UTF8;
  4.     private static byte[] _optionalEntropy = null;
  5.  
  6.     public static string Decrypt(this byte[] encryptedPassword)
  7.     {
  8.         if (encryptedPassword == null) throw new ArgumentNullException("encryptedPassword");
  9.         byte[] bytes = ProtectedData.Unprotect(encryptedPassword, _optionalEntropy, DataProtectionScope.CurrentUser);
  10.         return _encoding.GetString(bytes);
  11.     }
  12.  
  13.     /// <summary>
  14.     /// 
  15.     /// </summary>
  16.     /// <param name="password"></param>
  17.     /// <returns>Empty collection if the input is null or empty.</returns>
  18.     public static byte[] Encrypt(this string password)
  19.     {
  20.         if (string.IsNullOrEmpty(password)) return new byte[0];
  21.         byte[] buffer = _encoding.GetBytes(password);
  22.         return ProtectedData.Protect(buffer, _optionalEntropy, DataProtectionScope.CurrentUser);
  23.     }
  24. }

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