private async void DecryptButton_Click(object sender, RoutedEventArgs e)
{
if (isAES && aes != null)
{
ResultTextBlock.Text = CryptographyHelper.DecryptAes(
await FilesHelper.GetByteArrayAsync(_encryptedTextAes), aes);
}
else if (!isAES && rsa != null)
{
ResultTextBlock.Text = CryptographyHelper.DecryptRSA(
await FilesHelper.GetByteArrayAsync(_encryptedTextRsa), rsa.ExportParameters(true), false);
}
}
private async void MessageDigestButton_Click(object sender, RoutedEventArgs e)
{
if (FilesHelper.DataFolder == null)
{
ShowMessageDialog();
return;
}
String hash = CryptographyHelper.Sha256Hash(fileContent);
IStorageFile hashFile = await FilesHelper.GetFile(_messageDigest);
await FileIO.WriteTextAsync(hashFile, hash);
ResultTextBlock.Text = hash;
}
private async void SignButton_Click(object sender, RoutedEventArgs e)
{
if (FilesHelper.DataFolder == null)
{
ShowMessageDialog();
return;
}
String signedText = CryptographyHelper.CreateSignature(fileContent);
IStorageFile signedFile = await FilesHelper.GetFile(_signature);
await FileIO.WriteTextAsync(signedFile, signedText);
ResultTextBlock.Text = signedText;
}
private async void EncryptButton_Click(object sender, RoutedEventArgs e)
{
if (FilesHelper.DataFolder == null)
{
ShowMessageDialog();
return;
}
IStorageFile encryptedFile;
if (isAES)
{
aes = Aes.Create();
IStorageFile secretKeyFile = await FilesHelper.GetFile(_secretKey);
await FileIO.WriteBytesAsync(file : secretKeyFile, buffer : aes.Key);
encryptedFile = await FilesHelper.GetFile(_encryptedTextAes);
encryptedByteArrayAes = CryptographyHelper.EncryptAes(fileContent, aes);
await FileIO.WriteBytesAsync(file : encryptedFile, buffer : encryptedByteArrayAes);
ResultTextBlock.Text = await FileIO.ReadTextAsync(encryptedFile,
Windows.Storage.Streams.UnicodeEncoding.Utf16BE);
}
else
{
rsa = RSA.Create();
await CreateRsaKeys();
encryptedFile = await FilesHelper.GetFile(_encryptedTextRsa);
encryptedByteArrayRsa = CryptographyHelper.EncryptRSA(
await FilesHelper.GetByteArrayAsync(_initialText), rsa.ExportParameters(false));
await FileIO.WriteBytesAsync(file : encryptedFile, buffer : encryptedByteArrayRsa);
ResultTextBlock.Text = await FileIO.ReadTextAsync(encryptedFile,
UnicodeEncoding.Utf16BE);
}
}
private async void CheckSignatureButton_Click(object sender, RoutedEventArgs e)
{
if (FilesHelper.DataFolder == null)
{
ShowMessageDialog();
return;
}
String inputFileText = await FileIO.ReadTextAsync(inputFile);
IStorageFile signatureFile = await FilesHelper.GetFile(_signature);
String signature = await FileIO.ReadTextAsync(signatureFile);
if (CryptographyHelper.VerifySignature(inputFileText, signature))
{
ResultTextBlock.Text = "Potpis je ispravan";
}
else
{
ResultTextBlock.Text = "Potpis nije ispravan";
}
}