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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Security.Cryptography;
  6. using System.Globalization;
  7.  
  8. namespace ConsoleApplication1
  9. {
  10.     class Program
  11.     {
  12.         static void Main(string[] args)
  13.         {
  14.             String cryptedText = "debac58d0bc8526339678667bca923e15a7106a0c16c8148bd1468cefad57762ccf53a4a780bc27748c5583a02c41dee";
  15.             String key = "qwertyuioplkjhgfdsaz";
  16.             Console.WriteLine("Crypted Text = " + cryptedText);
  17.             Console.WriteLine("Key = " + key);
  18.             Console.WriteLine("Decrypted = " + Decrypt(cryptedText, key));
  19.             Console.ReadKey();
  20.         }
  21.  
  22.         public static string Decrypt(string toDecrypt, string key)
  23.         {
  24.             byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key); // AES-256 key
  25.             //TODO: make it support 16 bytes, 32 bytes 64 bytes etc.. only supports 24 bytes key atm
  26.             PadToMultipleOf(ref keyArray, 8);
  27.             //byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);
  28.             byte[] toEncryptArray = ConvertHexStringToByteArray(toDecrypt);
  29.  
  30.             RijndaelManaged rDel = new RijndaelManaged();
  31.             rDel.KeySize = (keyArray.Length * 8); // in bits
  32.             rDel.Key = keyArray;
  33.             rDel.Mode = CipherMode.ECB; // http://msdn.microsoft.com/en-us/library/system.security.cryptography.ciphermode.aspx
  34.             rDel.Padding = PaddingMode.None;  // better lang support
  35.             ICryptoTransform cTransform = rDel.CreateDecryptor();
  36.             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
  37.             return UTF8Encoding.UTF8.GetString(resultArray);
  38.         }
  39.  
  40.         public static void PadToMultipleOf(ref byte[] src, int pad)
  41.         {
  42.             int len = (src.Length + pad - 1) / pad * pad;
  43.             Array.Resize(ref src, len);
  44.         }
  45.  
  46.         public static byte[] ConvertHexStringToByteArray(string hexString)
  47.         {
  48.             if (hexString.Length % 2 != 0)
  49.             {
  50.                 throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, "The binary key cannot have an odd number of digits: {0}", hexString));
  51.             }
  52.  
  53.             byte[] HexAsBytes = new byte[hexString.Length / 2];
  54.             for (int index = 0; index < HexAsBytes.Length; index++)
  55.             {
  56.                 string byteValue = hexString.Substring(index * 2, 2);
  57.                 HexAsBytes[index] = byte.Parse(byteValue, NumberStyles.HexNumber, CultureInfo.InvariantCulture);
  58.             }
  59.  
  60.             return HexAsBytes;
  61.         }
  62.     }
  63. }
  64.  
Success #stdin #stdout 0.09s 34264KB
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Standard input is empty
stdout
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Crypted Text = debac58d0bc8526339678667bca923e15a7106a0c16c8148bd1468cefad57762ccf53a4a780bc27748c5583a02c41dee
Key = qwertyuioplkjhgfdsaz
Decrypted = http://w...content-available-to-author-only...o.com/hellohello.asp
https://ideone.com/XONRBf
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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