/// <summary>
/// Encrypteds the file.
/// </summary>
/// <param name="filePath">The file path.</param>
/// <returns></returns>
public static void EncryptedFile(string filePath)
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException();
}
var fileName = Path.GetFileName(filePath);
var cryptoKey = CaesarEncryptionAlgorithm.GenerateEncryptoKey(fileName, -3);
var outputFileName = string.Concat("E", fileName);
EncryptFile(filePath, outputFileName, cryptoKey);
}
/// <summary>
/// Decrypteds the file.
/// </summary>
/// <param name="filePath">The file path.</param>
/// <exception cref="FileNotFoundException">filePath
/// or
/// EncryptedFileNotFound</exception>
public static void DecryptedFile(string filePath)
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException(nameof(filePath));
}
var fileName = Path.GetFileName(filePath);
if (!fileName.StartsWith("E"))
{
throw new FileNotFoundException("EncryptedFileNotFound");
}
var originalFileName = fileName.Substring(1, fileName.Length - 1);
var chryptoKey = CaesarEncryptionAlgorithm.GenerateEncryptoKey(originalFileName, -3);
var outputFileName = string.Concat("D", originalFileName);
DecryptFile(filePath, outputFileName, chryptoKey);
}