public static void DecryptFile(string fileName)
{
if (File.Exists(fileName))
{
byte[] encrypted = File.ReadAllBytes(fileName);
DateTime startTime = DateTime.Now;
string decrypted = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV);
DateTime finishTime = DateTime.Now;
TimeSpan decryptionTime = finishTime - startTime;
string decryptedFileName = StringOperations.CreateDecryptionFileName(fileName, decryptionTime.TotalMilliseconds);
File.WriteAllText(decryptedFileName, decrypted);
}
}