/// <summary>
/// What to do when the selection changes in the QR Code site list:
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void cmboExportSiteQR_SelectedIndexChanged(object sender, EventArgs e)
{
// Asbestos underpants:
try
{
// Get the current selection of the combo box and make sure it
// isn't empty:
String site = (string)cmboExportSiteQR.Text;
if (!String.IsNullOrEmpty(site))
{
// Ask the main form to give us the site parameters for this site.
// Since the main form has all the code to do this, we'll ask it
// to do the dirty work.
SiteParameters siteParams = caller.GetSiteParamsForQRCode(site);
// Now we'll generate the text we'll embed into the QR Code. We want
// this to be as compact as we can get it, so our "headings" will be
// single letters. We'll start off with an identifying header so the
// QR Code reader will know the format of our string. We delimite the
// string with pipes, which aren't allowed in any of our fields. We
// want this to match as closely to the values of the XML export file
// for consistency. That means the hash engine and the character
// limit fields will need some tweaking.
StringBuilder sb = new StringBuilder();
sb.Append("CRYPTNOSv1|" +
"S:" + siteParams.Site + "|" +
"H:" + HashEngine.HashEnumStringToDisplayHash(siteParams.Hash) + "|" +
"I:" + siteParams.Iterations.ToString() + "|" +
"C:" + siteParams.CharTypes.ToString() + "|L:");
if (siteParams.CharLimit < 0)
{
sb.Append("0");
}
else
{
sb.Append(siteParams.CharLimit.ToString());
}
// Now that we've built our string, use the QRCodeWriter from ZXing to
// build the QR Code image and assign the bitmap to the picture box:
byteMatrix = qrCodeWriter.encode(sb.ToString(),
BarcodeFormat.QR_CODE, 200, 200);
pictureBox1.Image = byteMatrix.ToBitmap();
}
// If the selection in the combo box wasn't useful, empty the picture box:
else
{
pictureBox1.Image = null;
}
}
// Similarly, if anything blew up, empty the picture box:
catch { pictureBox1.Image = null; }
}
/// <summary>
/// Export a list of <see cref="SiteParameters"/> to an encrypted export file. Note
/// that this method only exports to the newer XML-based cross-platform format, not
/// the old platform specific format that is no longer supported.
/// </summary>
/// <param name="filename">A string containing the full path to the export file</param>
/// <param name="password">A string containing the password used to encrypt the
/// file</param>
/// <param name="generator">A string containing the "generator" ID for the file, usually
/// the full application name ("Cryptnos for Windows") and version number. If this
/// value is null the generator tag will be omitted from the file.</param>
/// <param name="comment">A string containing an optional comment. If this value is
/// null the comment tag will be omitted from the file.</param>
/// <param name="siteList">A <see cref="List"/> of <see cref="SiteParameters"/> to
/// export</param>
/// <exception cref="ArgumentException">Thrown if any required field (file name,
/// password, or site list) is empty or null</exception>
/// <exception cref="Exception">Thrown if anything blows up along the way</exception>
public static void ExportToFile(string filename, string password, string generator,
string comment, List <SiteParameters> siteList)
{
try
{
// A little bit of sanity checking. Make sure our required inputs are
// not null or empty:
if (String.IsNullOrEmpty(filename))
{
throw new ArgumentException("File name is empty or null");
}
if (String.IsNullOrEmpty(password))
{
throw new ArgumentException("Password is empty or null");
}
if (siteList == null || siteList.Count == 0)
{
throw new ArgumentException("Site parameter list is empty or null");
}
// Set up the XML formatting options for our XML writer. I don't think these
// guys are actually essential, given that our XML is not meant to be human
// readable, but they seemed to work for Mandelbrot Madness! so I'll keep them
// here.
XmlWriterSettings xws = new XmlWriterSettings();
xws.Indent = true;
xws.IndentChars = "\t";
xws.CloseOutput = true;
xws.Encoding = Encoding.UTF8;
// We won't be writing directly to a file, at least not yet. Create a memory
// stream for us to write to initially, then open up the XML writer to point
// to that stream. Note that we'll also gzip the XML as it goes into the
// memory stream to compress it.
MemoryStream ms = new MemoryStream();
XmlWriter xw = XmlWriter.Create(new GZipStream(ms,
CompressionMode.Compress), xws);
// Start writing out our XML by putting in the required headers. Note that
// the <version> tag is required and for now must be 1, but the <generator>
// and <comment> tags are technically optional. Generator is highly recommended,
// however, as that helps us ID where the file came from.
xw.WriteStartDocument();
xw.WriteStartElement("cryptnos", "http://www.cryptnos.com/");
xw.WriteElementString("version", "1");
if (!String.IsNullOrEmpty(generator))
{
xw.WriteElementString("generator", generator);
}
if (!String.IsNullOrEmpty(comment))
{
xw.WriteElementString("comment", comment);
}
xw.WriteElementString("siteCount", siteList.Count.ToString());
// Start writing out the <sites> tag
xw.WriteStartElement("sites");
// Now step through each site parameter group and write out a <site>
// tag to contain its data:
foreach (SiteParameters site in siteList)
{
xw.WriteStartElement("site");
xw.WriteElementString("siteToken", site.Site);
xw.WriteElementString("hash",
HashEngine.HashEnumStringToDisplayHash(site.Hash));
xw.WriteElementString("iterations", site.Iterations.ToString());
xw.WriteElementString("charTypes", site.CharTypes.ToString());
if (site.CharLimit < 0)
{
xw.WriteElementString("charLimit", "0");
}
else
{
xw.WriteElementString("charLimit", site.CharLimit.ToString());
}
xw.WriteEndElement();
}
// Close the <sites> tag:
xw.WriteEndElement();
// Close the <cryptnos> tag and the rest of the document:
xw.WriteEndElement();
xw.WriteEndDocument();
xw.Flush();
xw.Close();
ms.Flush();
ms.Close();
// Get the contents of the memory stream as raw bytes:
byte[] plaintext = ms.ToArray();
// Create the cipher. Note that we're using the encryption
// mode, and that we're passing in the password:
BufferedBlockCipher cipher = CreateCipher(password, true);
// Create our ciphertext container. Note that we call the
// cipher's getOutputSize() method, which tells us how big
// the resulting ciphertext should be. In practice, this
// has always been the same size as the plaintext, but we
// can't take that for granted.
byte[] ciphertext = new byte[cipher.GetOutputSize(plaintext.Length)];
// Do the encyrption. Note that the .NET version is different from
// the Java version. Here we've got it easy. The BC classes include
// a simpler one-call DoFinal() method that does everything for us.
ciphertext = cipher.DoFinal(plaintext);
// Write the ciphertext to the export file:
FileStream fs = new FileStream(filename, FileMode.Create);
fs.Write(ciphertext, 0, ciphertext.Length);
// Close up shop:
fs.Flush();
fs.Close();
plaintext = null;
ciphertext = null;
}
catch (Exception ex) { throw ex; }
}
