Problème avec AES et base64_encode le résultat

Question

J'essaie de chiffrer une chaîne puis de la convertir en une chaîne base64_encode pour la transmettre à un site Web afin qu'elle puisse la déchiffrer.

Mes fonctions ci-dessous ne semblent pas fonctionner correctement et il ne décryptera pas la chaîne base64_encode à la chaîne d'origine.

Quelqu'un a vu le problème?

Merci

public static string EncryptToString(string data, string KeyString, string IVString) 
{ 
    ASCIIEncoding encoding = new ASCIIEncoding(); 
    byte[] Data = encoding.GetBytes(data); 
    byte[] Key = encoding.GetBytes(KeyString); 
    byte[] IV = encoding.GetBytes(IVString); 

    try 
    { 
     MemoryStream fStream = new MemoryStream(Data); 

     // Set Rijndael object mode. 

     Rijndael RijndaelAlg; 
     RijndaelAlg = Rijndael.Create(); 
     RijndaelAlg.Mode = CipherMode.CBC; 

     // Create a CryptoStream using the FileStream 
     // and the passed key and initialization vector (IV). 
     CryptoStream cStream = new CryptoStream(fStream, 
      RijndaelAlg.CreateEncryptor(Key, IV), 
      CryptoStreamMode.Read); 

     // Create a StreamReader using the CryptoStream. 
     StreamReader sReader = new StreamReader(cStream); 

     string encryptedString = null; 

     try 
     { 
      // Read the data from the stream 
      // to decrypt it. 
      encryptedString = sReader.ReadToEnd(); 

      // Convert result into a base64-encoded string. 
      byte[] bytes = encoding.GetBytes(encryptedString); 
      encryptedString = Convert.ToBase64String(bytes, 0, bytes.Length); 

     } 
     catch (Exception e) 
     { 
      Console.WriteLine("An error occurred: {0}", e.Message); 
     } 
     finally 
     { 
      // Close the streams and 
      // close the file. 
      sReader.Close(); 
      cStream.Close(); 
      fStream.Close(); 
      RijndaelAlg.Dispose(); 
     } 

     // Return the string. 
     return encryptedString; 
    } 
    catch (CryptographicException e) 
    { 
     Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); 
     return null; 
    } 
    catch (UnauthorizedAccessException e) 
    { 
     Console.WriteLine("A file error occurred: {0}", e.Message); 
     return null; 
    } 
} 

public static string DecryptToString(string data, string KeyString, string IVString) 
{ 
    ASCIIEncoding encoding = new ASCIIEncoding(); 
    // Convert result from a base64-encoded to string. 
    byte[] Data = Convert.FromBase64String(data); 

    byte[] Key = encoding.GetBytes(KeyString); 
    byte[] IV = encoding.GetBytes(IVString); 

    try 
    { 
     MemoryStream fStream = new MemoryStream(Data); 

     // Set Rijndael object mode. 
     Rijndael RijndaelAlg; 
     RijndaelAlg = Rijndael.Create(); 
     RijndaelAlg.Mode = CipherMode.CBC; 

     // Create a CryptoStream using the FileStream 
     // and the passed key and initialization vector (IV). 
     CryptoStream cStream = new CryptoStream(fStream, 
      RijndaelAlg.CreateDecryptor(Key, IV), 
      CryptoStreamMode.Read); 

     // Create a StreamReader using the CryptoStream. 
     StreamReader sReader = new StreamReader(cStream); 

     string decryptedString = null; 

     try 
     { 
      // Read the data from the stream 
      // to decrypt it. 
      decryptedString = sReader.ReadToEnd(); 

     } 
     catch (Exception e) 
     { 
      Console.WriteLine("An error occurred: {0}", e.Message); 
     } 
     finally 
     { 
      // Close the streams and 
      // close the file. 
      sReader.Close(); 
      cStream.Close(); 
      fStream.Close(); 
      RijndaelAlg.Dispose(); 
     } 

     // Return the string. 
     return decryptedString; 
    } 
    catch (CryptographicException e) 
    { 
     Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); 
     return null; 
    } 
    catch (UnauthorizedAccessException e) 
    { 
     Console.WriteLine("A file error occurred: {0}", e.Message); 
     return null; 
    } 
} 

Answer 1

Je ne sais pas exactement où il va mal, mais quand je faisais cela, j'eu quelques problèmes étranges aussi. Je vais partager avec vous le code que j'ai écrit pour obtenir ce travail correctement:

     static public String EncryptString(String message) 
     { 
      String sRet = ""; 
      RijndaelManaged rj = new RijndaelManaged(); 
      try 
      { 
       rj.Key = Key; 
       rj.IV = IV; 
       MemoryStream ms = new MemoryStream(); 

       using (CryptoStream cs = new CryptoStream(ms, rj.CreateEncryptor(Key, IV), CryptoStreamMode.Write)) 
       { 
        using (StreamWriter sw = new StreamWriter(cs)) 
        { 
         sw.Write(message); 
        } 
       } 
       byte[] encoded = ms.ToArray(); 
       sRet = Convert.ToBase64String(encoded); 

      } 
      finally 
      { 
       rj.Clear(); 
      } 

      return sRet; 

     } 

     static public String DecryptString(String cypher) 
     { 
      String sRet = ""; 
      RijndaelManaged rj = new RijndaelManaged(); 
      try 
      { 
       byte[] message = Convert.FromBase64String(cypher); 
       rj.Key = Key; 
       rj.IV = IV; 
       MemoryStream ms = new MemoryStream(message); 

       using (CryptoStream cs = new CryptoStream(ms, rj.CreateDecryptor(Key, IV), CryptoStreamMode.Read)) 
       { 
        using (StreamReader sr = new StreamReader(cs)) 
        { 
         sRet = sr.ReadToEnd(); 
        } 
       } 

      } 
      finally 
      { 
       rj.Clear(); 
      } 

      return sRet; 

     }

Key et IV sont statiques octet [] contenu dans la classe.