/// <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>
/// Read a <see cref="List"/> of <see cref="SiteParameters"/> from the new XML-based
/// cross-platform export file format
/// </summary>
/// <param name="filename">A string containing the full path to the import file</param>
/// <param name="password">A string containing the password used to decrypt the
/// file</param>
/// <returns>A <see cref="List"/> of <see cref="SiteParameters"/></returns>
/// <exception cref="ImportHandlerException">Thrown if a parsing error occurs during
/// the import process</exception>
/// <exception cref="Exception">Thrown if anything else blows up along the way</exception>
private static List <SiteParameters> ImportFromXMLv1File(string filename,
string password)
{
try
{
// Declare somewhere to hold the site count as read from the file:
int siteCount = 0;
// Try to open a file stream for the file:
FileStream fs = new FileStream(filename, FileMode.Open);
// The process below will blow up if we try to read a file that is so large
// it exceeds the 32-bit integer max value. This should never happen with an
// actual Cryptnos export file, but if the user accidentally tries to import
// a DVD ISO or something, we don't want to blow up their machine. Bomb out
// if we find out that the file is too large.
if (fs.Length > (long)Int32.MaxValue)
{
fs.Close();
throw new ImportHandlerException("Import file too large to load into memory");
}
// Read the entire contents of the file into memory:
byte[] contents = new byte[(int)fs.Length];
fs.Read(contents, 0, contents.Length);
fs.Close();
// Create our cipher in decryption mode:
BufferedBlockCipher cipher = CreateCipher(password, false);
// Create our plaintext container:
byte[] plaintext = new byte[cipher.GetOutputSize(contents.Length)];
// Decrypt the data and create a memory stream so we can read from it:
plaintext = cipher.DoFinal(contents);
MemoryStream ms = new MemoryStream(plaintext);
contents = null;
// Define our XML reader settings:
XmlReaderSettings xmlReaderSettings = new XmlReaderSettings();
// Note that we'll point to our local copy of the XSD, which should be in the
// application directory:
xmlReaderSettings.Schemas.Add("http://www.cryptnos.com/",
Application.StartupPath + Char.ToString(System.IO.Path.DirectorySeparatorChar) +
"cryptnos_export1.xsd");
// Validate against the schema. Invalid files will throw exceptions:
xmlReaderSettings.ValidationType = ValidationType.Schema;
xmlReaderSettings.ValidationEventHandler +=
new ValidationEventHandler(xmlReaderSettings_ValidationEventHandler);
// Ignore unnecessary information:
xmlReaderSettings.IgnoreComments = true;
xmlReaderSettings.IgnoreWhitespace = true;
// Close any other file/input streams when we close this one:
xmlReaderSettings.CloseInput = true;
// Create the XML reader. Note that we're reading from the memory stream
// created from the decrypted file, then passing that through a gzip
// decompressor before actually getting to the data.
XmlReader xr = XmlReader.Create(new GZipStream(ms,
CompressionMode.Decompress), xmlReaderSettings);
// This forces us to go to the first element, which should be <cryptnos>. If
// not, complain:
xr.MoveToContent();
if (xr.Name != "cryptnos")
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected <cryptnos> tag but got <" + xr.Name + ">");
}
// At this point, things are looking good. We'll hopefully have sites we can
// import now. Go ahead and create our List of SiteParameters so we can start
// building it:
List <SiteParameters> siteList = new List <SiteParameters>();
// Read the next element. This should be a <version> tag. If it is, make sure
// it's a version we recognize. Otherwise, complain.
xr.Read();
if (xr.NodeType != XmlNodeType.Element)
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an element, but got " + xr.NodeType.ToString());
}
if (xr.Name.CompareTo("version") == 0)
{
xr.Read();
// Make sure this is a text value, then make sure it's the version
// number we expect. This version of Cryptnos only accepts version
// 1 of the Cryptnos export file format.
if (xr.NodeType == XmlNodeType.Text && xr.Value != "1")
{
throw new ImportHandlerException("This Cryptnos export file appears to have been generated by a later version of Cryptnos and is incompatible with this version. (File format version was " + xr.Value + ".)");
}
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected a <version> element, but got <" + xr.Name + ">");
}
// Read on to the next tag:
xr.Read();
while (xr.NodeType == XmlNodeType.EndElement)
{
xr.Read();
}
if (xr.NodeType != XmlNodeType.Element)
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an element, but got " + xr.NodeType.ToString());
}
// At this point, the next few tags should be the <generator> and/or <comment>
// tags, neither of which we care about. Therefore, just read ahead until we
// hit the <sites> tag, which is where we really want to go to next.
while (xr.Name.CompareTo("siteCount") != 0)
{
do
{
xr.Read();
} while (xr.NodeType != XmlNodeType.Element);
}
// The next tag should be the <siteCount> tag. This contains the number of
// site blocks in the file. This technically isn't necessary, but it was added
// to improve reporting on Android, where performance is much more of an issue.
// The main thing we'll worry about here is that (a) it's an integer greater
// than zero and (b) the number of sites we eventually read must equal the
// count listed here.
if (xr.NodeType == XmlNodeType.Element && xr.Name.CompareTo("siteCount") == 0)
{
xr.Read();
if (xr.NodeType == XmlNodeType.Text)
{
siteCount = Int32.Parse(xr.Value);
}
if (siteCount <= 0)
{
throw new ImportHandlerException("Invalid Cryptnos export file; <siteCount> is " + siteCount.ToString());
}
}
// Read on to the next tag:
xr.Read();
while (xr.NodeType == XmlNodeType.EndElement)
{
xr.Read();
}
// Now we need to check to make sure we actually got a <sites> tag:
if (xr.NodeType == XmlNodeType.Element && xr.Name.CompareTo("sites") == 0)
{
// Read the next tag. This should be a <site> tag and the beginning of a
// site defintion.
xr.Read();
while (xr.NodeType == XmlNodeType.Element && xr.Name.CompareTo("site") == 0)
{
// Create a new SiteParameters object to store the data we're about
// to read.
SiteParameters site = new SiteParameters();
// Try to read the <siteToken> tag:
xr.Read();
if (xr.NodeType != XmlNodeType.Element)
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an element, but got " + xr.NodeType.ToString());
}
if (xr.Name.CompareTo("siteToken") == 0)
{
xr.Read();
if (xr.NodeType == XmlNodeType.Text)
{
site.Site = xr.Value;
}
else
{
throw new ImportHandlerException("Invalid site token (" + xr.Value + ")");
}
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected a <siteToken> element, but got <" + xr.Name + ">");
}
do
{
xr.Read();
} while (xr.NodeType != XmlNodeType.Element);
// Try to read the <hash> tag:
if (xr.NodeType != XmlNodeType.Element)
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an element, but got " + xr.NodeType.ToString());
}
if (xr.Name.CompareTo("hash") == 0)
{
xr.Read();
if (xr.NodeType == XmlNodeType.Text)
{
site.Hash = HashEngine.DisplayHashToHashEnumString(xr.Value);
}
else
{
throw new ImportHandlerException("Invalid hash token (" + xr.Value + ")");
}
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected a <hash> element, but got <" + xr.Name + ">");
}
do
{
xr.Read();
} while (xr.NodeType != XmlNodeType.Element);
// Try to read the <iterations> tag:
if (xr.NodeType != XmlNodeType.Element)
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an element, but got " + xr.NodeType.ToString());
}
if (xr.Name.CompareTo("iterations") == 0)
{
xr.Read();
if (xr.NodeType == XmlNodeType.Text)
{
site.Iterations = Int32.Parse(xr.Value);
}
else
{
throw new ImportHandlerException("Invalid iterations token (" + xr.Value + ")");
}
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an <iterations> element, but got <" + xr.Name + ">");
}
do
{
xr.Read();
} while (xr.NodeType != XmlNodeType.Element);
// Try to read the <charTypes> tag:
if (xr.NodeType != XmlNodeType.Element)
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an element, but got " + xr.NodeType.ToString());
}
if (xr.Name.CompareTo("charTypes") == 0)
{
xr.Read();
if (xr.NodeType == XmlNodeType.Text)
{
site.CharTypes = Int32.Parse(xr.Value);
}
else
{
throw new ImportHandlerException("Invalid charTypes token (" + xr.Value + ")");
}
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected a <charTypes> element, but got <" + xr.Name + ">");
}
do
{
xr.Read();
} while (xr.NodeType != XmlNodeType.Element);
// Try to read the <charLimit> tag:
if (xr.NodeType != XmlNodeType.Element)
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected an element, but got " + xr.NodeType.ToString());
}
if (xr.Name.CompareTo("charLimit") == 0)
{
xr.Read();
if (xr.NodeType == XmlNodeType.Text)
{
// The character limit, unfortunately, is a bit inconsistent.
// Obviously, we can't limit it to zero, as that will mean we
// have an empty password. But the XML schema defines this as
// only positive integers, so our built-in -1 value can't work.
// So if we read a zero, convert it to -1 here. We'll do the
// reverse when we write the file.
site.CharLimit = Int32.Parse(xr.Value);
if (site.CharLimit == 0)
{
site.CharLimit = -1;
}
}
else
{
throw new ImportHandlerException("Invalid charLimit token (" + xr.Value + ")");
}
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected a <charLimit> element, but got <" + xr.Name + ">");
}
// The next item should be the closing element for <charLimit>, so
// read it in and then read the next one. That should either be the
// start element for the next <site> or the closing element for
// <sites>.
xr.Read();
if (xr.NodeType == XmlNodeType.EndElement)
{
xr.Read();
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected ending <charLimit> tag, got " + xr.NodeType.ToString());
}
if (xr.NodeType == XmlNodeType.EndElement)
{
xr.Read();
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; expected ending <site> tag, got " + xr.NodeType.ToString());
}
// We should now have a hopefully valid SiteParameters object. Add it
// to the site list:
siteList.Add(site);
}
// We get here, we've exhausted the <sites> block and all that should be
// left will be closing tags. If we were going to be extremely thorough,
// we should probably check these closing tags and make sure they're legit.
// For now, we'll just assume there's nothing left to read. Close the
// streams, free up memory, and return the list of read sites.
xr.Close();
ms.Close();
ms.Dispose();
plaintext = null;
if (siteList.Count != siteCount)
{
throw new ImportHandlerException("Invalid Cryptnos export file; File reported " + siteCount.ToString() + " sites in the file, but actually read " + siteList.Count.ToString());
}
return(siteList);
}
else
{
throw new ImportHandlerException("Invalid Cryptnos export file; could not find <sites> tag");
}
}
catch (Exception ex) { throw ex; }
}
/// <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; }
}
