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  1. /*
  2.     Simple Fallout Shelter saved game decrypt/encrypt 
  3.     Author: superkhung@vnsecurity.net
  4. 	Usage: FOSDecrypt.exe input_file
  5.     File will decrypt if it's encrypted and vice versa
  6.     Use any json editor to edit saved data
  7. */
  8.  
  9. using System;
  10. using System.IO;
  11. using System.Text;
  12. using System.Security.Cryptography;
  13. using System.Text.RegularExpressions;
  14.  
  15. public static class FalloutShelterDecrypt
  16. {
  17. 	private const string initVector = "tu89geji340t89u2";
  18. 	private const string passPhrase = "UGxheWVy";
  19. 	private const int keysize = 256;
  20.  
  21. 	public static bool IsBase64String (this string s)
  22. 	{
  23. 		s = s.Trim ();
  24. 		return (s.Length % 4 == 0) && Regex.IsMatch (s, @"^[a-zA-Z0-9\+/]*={0,3}$", RegexOptions.None);
  25.  
  26. 	}
  27.  
  28. 	public static string Encrypt (string Text)
  29. 	{
  30. 		byte[] initVectorBytes = Encoding.UTF8.GetBytes (initVector);
  31. 		byte[] plainTextBytes = Encoding.UTF8.GetBytes (Text);
  32. 		Rfc2898DeriveBytes password = new Rfc2898DeriveBytes (passPhrase, initVectorBytes);
  33. 		byte[] keyBytes = password.GetBytes (keysize / 8);
  34. 		RijndaelManaged symmetricKey = new RijndaelManaged ();
  35. 		symmetricKey.Mode = CipherMode.CBC;
  36. 		ICryptoTransform encryptor = symmetricKey.CreateEncryptor (keyBytes, initVectorBytes);
  37. 		MemoryStream memoryStream = new MemoryStream ();
  38. 		CryptoStream cryptoStream = new CryptoStream (memoryStream, encryptor, CryptoStreamMode.Write);
  39. 		cryptoStream.Write (plainTextBytes, 0, plainTextBytes.Length);
  40. 		cryptoStream.FlushFinalBlock ();
  41. 		byte[] Encrypted = memoryStream.ToArray ();
  42. 		memoryStream.Close ();
  43. 		cryptoStream.Close ();
  44. 		return Convert.ToBase64String (Encrypted);
  45. 	}
  46.  
  47. 	public static string Decrypt (string EncryptedText)
  48. 	{
  49. 		byte[] initVectorBytes = Encoding.ASCII.GetBytes (initVector);
  50. 		byte[] DeEncryptedText = Convert.FromBase64String (EncryptedText);
  51. 		Rfc2898DeriveBytes password = new Rfc2898DeriveBytes (passPhrase, initVectorBytes);
  52. 		byte[] keyBytes = password.GetBytes (keysize / 8);
  53. 		RijndaelManaged symmetricKey = new RijndaelManaged ();
  54. 		symmetricKey.Mode = CipherMode.CBC;
  55. 		ICryptoTransform decryptor = symmetricKey.CreateDecryptor (keyBytes, initVectorBytes);
  56. 		MemoryStream memoryStream = new MemoryStream (DeEncryptedText);
  57. 		CryptoStream cryptoStream = new CryptoStream (memoryStream, decryptor, CryptoStreamMode.Read);
  58. 		byte[] plainTextBytes = new byte[DeEncryptedText.Length];
  59. 		int decryptedByteCount = cryptoStream.Read (plainTextBytes, 0, plainTextBytes.Length);
  60. 		memoryStream.Close ();
  61. 		cryptoStream.Close ();
  62. 		return Encoding.UTF8.GetString (plainTextBytes, 0, decryptedByteCount);
  63. 	}
  64.  
  65. 	static void Main (string[] args)
  66. 	{
  67. 		if (args.Length < 1) {
  68. 			Console.WriteLine ("Usage: FOSDecrypt.exe input_file");
  69. 		}
  70.  
  71. 		String data = File.ReadAllText (args [0]);
  72.  
  73. 		if (IsBase64String (data)) {
  74. 			File.WriteAllText (args [0], Decrypt (data));
  75. 		} else {
  76. 			File.WriteAllText (args [0], Encrypt (data));
  77. 		}
  78. 	}
  79. }
Runtime error #stdin #stdout #stderr 0.04s 26976KB
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stdin
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Standard input is empty
stdout
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Usage: FOSDecrypt.exe input_file
stderr
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Unhandled Exception:
System.IndexOutOfRangeException: Array index is out of range.
  at FalloutShelterDecrypt.Main (System.String[] args) [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.IndexOutOfRangeException: Array index is out of range.
  at FalloutShelterDecrypt.Main (System.String[] args) [0x00000] in <filename unknown>:0
https://ideone.com/nXD4bA
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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