public void Encrypt_Decrypt_Cycle(string text, string keyText, string textFileName, string expectedCipher)
{
var encrypted = SymmetricKeyCryptography.Encrypt(text, keyText, textFileName);
Assert.AreEqual(expectedCipher, encrypted);
var decrypted = SymmetricKeyCryptography.Decrypt(encrypted, keyText, textFileName);
Assert.AreEqual(text, decrypted);
}
/// <summary>
/// Produces a file ending with ".encrypted".
/// WARNING: The file can't not be renmaed or the file can't be decrypted. If the original filename is changed and forgotten the data is lost.
/// </summary>
/// <param name="path">Full path to file.</param>
/// <param name="password">Password to encrpt file.</param>
/// <returns>Returns the path to the encrypted file.</returns>
private static string Encrypt(string path, string password)
{
var fileName = path.Split('\\').Last();
var data = File.ReadAllBytes(path);
var encrypted = SymmetricKeyCryptography.Encrypt(
data: Convert.ToBase64String(data),
keyText: password,
initializationVectorText: fileName);
var encryptedPath = path + ".encrypted";
File.WriteAllBytes(encryptedPath, Convert.FromBase64String(encrypted));
return(encryptedPath);
}
/// <summary>
/// Requires a file with an ending with ".encrypted" for example: "secrets.zip.encrypted".
/// Creates a file ending with ".decrypted-2017-12-19" for example: "secrets.zip.decrypted-2017-12-19T08-08-11Z".
/// If the file "secrets.zip.decrypted-2017-12-19T08-08-11Z" had already existed, it would be overwritten.
/// </summary>
/// <returns>Returns the path to the encrypted file.</returns>
private static string Decrypt(string path, string password)
{
var originalPath = path.Substring(0, path.Length - ENCRYPTED_EXT.Length);
var originalFileName = originalPath.Split('\\').Last();
var encryptedData = File.ReadAllBytes(path);
var encrypted = SymmetricKeyCryptography.Decrypt(
encrypted: Convert.ToBase64String(encryptedData),
keyText: password,
initializationVectorText: originalFileName);
var today = DateTime.Now.ToString("yyyy-MM-ddTHH-mm-ssZ");
var safeWritePath = originalPath + $".decrypted-{today}";
File.WriteAllBytes(safeWritePath, Convert.FromBase64String(encrypted));
return(safeWritePath);
}
