public static byte[] DecryptData(byte[] protectedData, string strMachineKeysFilePath, string strValidationAlgorithm, string strDecryptionAlgorithm, string strTargetPagePath, string strIISAppPath, string strAntiCSRFToken)
{
byte[] clearData = null;
if (File.Exists(strMachineKeysFilePath))
{
byte[] byteEncryptionIV = new byte[16];
Buffer.BlockCopy(protectedData, 0, byteEncryptionIV, 0, byteEncryptionIV.Length);
Console.Write("\n\nDecryption process start!!\n\n");
string[] machineKeys = File.ReadAllLines(strMachineKeysFilePath);
int nIndex = 1;
foreach (string strLine in machineKeys)
{
try
{
Console.ForegroundColor = ConsoleColor.Blue;
Console.Write("\rPocessing machinekeys : {0}/{1}....", nIndex++, machineKeys.Length);
string[] values = strLine.Split(',');
string strValidationKey = values[0];
string strDecryptionKey = values[1];
Purpose objPurpose = null;
if (DefinePurpose.enumPurpose == EnumPurpose.VIEWSTATE)
{
objPurpose = DefinePurpose.GetViewStatePurpose(strTargetPagePath, strIISAppPath, strAntiCSRFToken);
}
else
{
objPurpose = DefinePurpose.GetPurpose();
}
AspNetCryptoServiceProvider obj = new AspNetCryptoServiceProvider(strValidationKey, strValidationAlgorithm, strDecryptionKey, strDecryptionAlgorithm);
ICryptoService cryptoService = obj.GetCryptoService(objPurpose, CryptoServiceOptions.CacheableOutput);
clearData = cryptoService.Unprotect(protectedData);
if (clearData != null)
{
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("\n\nKeys found!!");
Console.WriteLine("------------");
Console.ForegroundColor = ConsoleColor.Blue;
Console.WriteLine("DecryptionKey:" + strDecryptionKey);
Console.WriteLine("ValidationKey:" + strValidationKey);
DataWriter.WriteKeysToFile(strValidationKey, strDecryptionKey, strValidationAlgorithm, strDecryptionAlgorithm, byteEncryptionIV);
Console.ResetColor();
break;
}
else
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Null data found for following keys!!");
Console.WriteLine("\n\nDecryptionKey:" + strDecryptionKey);
Console.WriteLine("ValidationKey:" + strValidationKey + "\n\n");
Console.ResetColor();
}
}
catch (Exception e)
{
}
}
}
return(clearData);
}
