private void btnDecryptZip_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtNotificationZip.Text) || string.IsNullOrWhiteSpace(txtReceiverCert.Text))
{
// files validation
MessageBox.Show("Either the ZIP file or certificate was not specified!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
string zipFolder = "";
try
{
//Deflate the zip archive
zipFolder = ZipManager.ExtractArchive(txtNotificationZip.Text, txtNotificationFolder.Text);
}
catch (Exception ex)
{
ex.DisplayException(Text);
return;
}
//Decrypt the Payload
string decryptedPayload = "";
try
{
decryptedPayload = AesManager.DecryptNotification(zipFolder, txtReceiverCert.Text, txtRecKeyPassword.Text, radECB.Checked);
}
catch (Exception ex)
{
ex.DisplayException("Decryption Failed:" + Text);
return;
}
// success
MessageBox.Show("Decryption process is complete!", Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
/// <summary>
/// This will decrypt the payload from a downloaded and decompressed notification
/// </summary>
/// <param name="xmlProcessingFolder">The path to folder that contains the decompressed notification files</param>
/// <param name="decryptionKey">The key file used to decrypt the AES key</param>
/// <param name="decryptionPass">The password to the key file above</param>
/// <param name="isECB">Determines the cipher mode, CBC or ECB</param>
/// <returns>the file path to the decrypted payload file</returns>
public static string DecryptNotification(string xmlProcessingFolder, string decryptionKey, string decryptionPass, bool isECB)
{
// select encrypted key file
string encryptedKeyFile = "";
string encryptedPayloadFile = "";
string metadataFile = "";
string[] keyFiles = Directory.GetFiles(xmlProcessingFolder, "*_Key", SearchOption.TopDirectoryOnly);
string[] payloadFiles = Directory.GetFiles(xmlProcessingFolder, "*_Payload", SearchOption.TopDirectoryOnly);
string[] metadataFiles = Directory.GetFiles(xmlProcessingFolder, "*_Metadata*", SearchOption.TopDirectoryOnly);
if (keyFiles.Length == 0)
{
// key file validation
throw new Exception("There was no file found containing the encrypted AES key!");
}
if (payloadFiles.Length == 0)
{
// key file validation
throw new Exception("There was no file found containing the encrypted Payload!");
}
if (metadataFiles.Length == 0)
{
// key file validation
throw new Exception("There was no file found containing the Metadata!");
}
encryptedKeyFile = keyFiles[0];
encryptedPayloadFile = payloadFiles[0];
metadataFile = metadataFiles[0];
//Check the metadata and see what we have
string metadataContentType = XmlManager.CheckMetadataType(metadataFile);
byte[] encryptedAesKey = null;
byte[] decryptedAesKey = null;
byte[] aesVector = null;
string decryptedPayload = "";
// load encrypted AES key
encryptedAesKey = File.ReadAllBytes(encryptedKeyFile);
// decrypt AES key & generate default (empty) initialization vector
decryptedAesKey = AesManager.DecryptAesKey(encryptedAesKey, decryptionKey, decryptionPass);
aesVector = AesManager.GenerateRandomKey(16, true);
if (isECB != true)
{
aesVector = decryptedAesKey.Skip(32).Take(16).ToArray();
decryptedAesKey = decryptedAesKey.Take(32).ToArray();
}
// decrypt encrypted ZIP file using decrypted AES key
string decryptedFileName = encryptedPayloadFile.Replace("_Payload", "_Payload_decrypted.zip");
AesManager.DecryptFile(encryptedPayloadFile, decryptedFileName, decryptedAesKey, aesVector, isECB);
//Deflate the decrypted zip archive
ZipManager.ExtractArchive(decryptedFileName, xmlProcessingFolder, true);
decryptedPayload = decryptedFileName.Replace("_Payload_decrypted.zip", "_Payload.xml");
//If the metadata is something other than XML, read the wrapper and rebuild the non-XML file
if (metadataContentType != "XML")
{
//Some non-XML files may not have _Payload in the file name, if not remove it
if (!File.Exists(decryptedPayload))
{
decryptedPayload = decryptedPayload.Replace("_Payload.xml", ".xml");
}
//This will give us the base64 encoded data from the XML file
string encodedData = XmlManager.ExtractXMLImageData(decryptedPayload);
//We will convert the base64 data back to bytes
byte[] binaryData;
string decodedPayload = decryptedPayload.Replace(".xml", "." + metadataContentType);
binaryData = System.Convert.FromBase64String(encodedData);
//We can write the bytes back to rebuild the file
FileStream decodedFile;
decodedFile = new FileStream(decodedPayload, System.IO.FileMode.Create, System.IO.FileAccess.Write);
decodedFile.Write(binaryData, 0, binaryData.Length);
decodedFile.Close();
}
return(decryptedPayload);
}
private void btnDecryptZip_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtNotificationZip.Text) || string.IsNullOrWhiteSpace(txtReceiverCert.Text))
{
// files validation
MessageBox.Show("Either the ZIP file or certificate was not specified!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
string zipFolder = "";
try
{
//Deflate the zip archive
zipFolder = ZipManager.ExtractArchive(txtNotificationZip.Text, txtNotificationFolder.Text);
}
catch (Exception ex)
{
ex.DisplayException(Text);
return;
}
// select encrypted key file
string encryptedKeyFile = "";
string encryptedPayloadFile = "";
string[] keyFiles = Directory.GetFiles(zipFolder, "*_Key", SearchOption.TopDirectoryOnly);
string[] payloadFiles = Directory.GetFiles(zipFolder, "*_Payload", SearchOption.TopDirectoryOnly);
if (keyFiles.Length == 0)
{
// key file validation
MessageBox.Show("There was no file found containing the encrypted AES key!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
if (payloadFiles.Length == 0)
{
// key file validation
MessageBox.Show("There was no file found containing the encrypted Payload!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
encryptedKeyFile = keyFiles[0];
encryptedPayloadFile = payloadFiles[0];
byte[] encryptedAesKey = null;
byte[] decryptedAesKey = null;
byte[] aesVector = null;
try
{
// load encrypted AES key
encryptedAesKey = File.ReadAllBytes(encryptedKeyFile);
// decrypt AES key & generate default (empty) initialization vector
decryptedAesKey = AesManager.DecryptAesKey(encryptedAesKey, txtReceiverCert.Text, txtRecKeyPassword.Text);
aesVector = AesManager.GenerateRandomKey(16, true);
if (radECB.Checked != true)
{
aesVector = decryptedAesKey.Skip(32).Take(16).ToArray();
decryptedAesKey = decryptedAesKey.Take(32).ToArray();
}
// decrypt encrypted ZIP file using decrypted AES key
string decryptedFileName = encryptedPayloadFile.Replace("_Payload", "_Payload_decrypted.zip");
AesManager.DecryptFile(encryptedPayloadFile, decryptedFileName, decryptedAesKey, aesVector, radECB.Checked);
//Deflate the decrypted zip archive
ZipManager.ExtractArchive(decryptedFileName, decryptedFileName, false);
// success
MessageBox.Show("Notification decryption process is complete!", Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
ex.DisplayException(Text);
}
finally
{
if (encryptedAesKey != null)
{
encryptedAesKey = null;
}
if (decryptedAesKey != null)
{
decryptedAesKey = null;
}
if (aesVector != null)
{
aesVector = null;
}
}
}
private void btnCheckNotification_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtDecryptKey.Text))
{
// files validation
MessageBox.Show("The Receiver's key for decryption must be set!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
Char delimiter = ',';
Dictionary <string, string> transmissions = new Dictionary <string, string>();
try
{ // Open the text file using a stream reader.
using (StreamReader sr = new StreamReader("simplelog.csv"))
{
while (sr.Peek() >= 0)
{
String line = sr.ReadLine();
string[] strLineArray = line.Split(delimiter);
//if there is no notification id, we will store the file name
if (strLineArray[4] == "NOTIFICATIONID")
{
transmissions.Add(strLineArray[2], line);
}
else
// otherwise, we store the notification id, and we can ignore this file if it is in the inbox
{
transmissions.Add(strLineArray[4], line);
}
Console.WriteLine(line);
}
}
}
catch (Exception ex)
{
ex.DisplayException(Text);
return;
}
//Connect to the Inbox and see if there are any files
try
{
// Setup session options
SessionOptions currentSFTPSession = SFTPManager.CreateSFTPSession(cmbSFTPServers.SelectedItem.ToString(), username.Text, password.Text);
SFTPManager.DownloadInbox(currentSFTPSession, transmissions, txtDownFolder.Text);
}
catch (Exception ex)
{
ex.DisplayException(Text);
return;
}
//loop through the files we have downloaded and process them
//these files will be matched to our log file to see if we have any matches
string[] filesToProcess;
string xmlProcessedFolder = "";
string xmlProcessingFolder = "";
string xmlProcessedUnmatchedFolder = "";
string destinationFolder = "";
// Load all XML files in the folder into the array
filesToProcess = Directory.GetFiles(txtDownFolder.Text, "*.zip", SearchOption.TopDirectoryOnly);
xmlProcessedFolder = txtDownFolder.Text + "\\Processed";
xmlProcessingFolder = txtDownFolder.Text + "\\Processing";
xmlProcessedUnmatchedFolder = txtDownFolder.Text + "\\Processed\\Unmatched";
//if the processedFolder doesn't exist, create it
if (!Directory.Exists(xmlProcessedFolder))
{
Directory.CreateDirectory(xmlProcessedFolder);
}
//if the processedUnmatchedFolder doesn't exist, create it
if (!Directory.Exists(xmlProcessedUnmatchedFolder))
{
Directory.CreateDirectory(xmlProcessedUnmatchedFolder);
}
//if the processingFolder doesn't exist, create it
if (!Directory.Exists(xmlProcessingFolder))
{
Directory.CreateDirectory(xmlProcessingFolder);
}
//loop through the downloaded files
int matchCounter = 0;
int unmatchCounter = 0;
foreach (string fileName in filesToProcess)
{
try
{
//clean out the processing folder, the current file will be unzipped into it
DirectoryInfo dir = new DirectoryInfo(xmlProcessingFolder);
foreach (FileInfo fi in dir.GetFiles())
{
fi.Delete();
}
//Deflate the zip archive
ZipManager.ExtractArchive(fileName, xmlProcessingFolder, false);
}
catch (Exception ex)
{
ex.DisplayException(Text);
return;
}
string decryptedPayload = "";
try
{
decryptedPayload = AesManager.DecryptNotification(xmlProcessingFolder, txtDecryptKey.Text, txtDecryptPassword.Text, radECB.Checked);
}
catch (Exception ex)
{
ex.DisplayException("Decryption Failed:" + Text);
return;
}
//take a look at the decrypted payload and see if this notification matches anything we are looking for
string[] notificationID = new string[3];
string notificationFileName = Path.GetFileNameWithoutExtension(fileName);
bool isFileMatched = false;
//This will return three values
//0 Ides Transmission ID
//1 Sender FIle Id
//2 Return Code
notificationID = XmlManager.CheckNotification(decryptedPayload);
//Check our log file dictionary and see if we can find a match
if (transmissions.ContainsKey(notificationID[1]) == true)
{
isFileMatched = true;
//we will add a new record to reflect the updated information and remove the old record
//make sure the filename is in our transmissions and return the current log data for it
string currentNotificationData = "";
transmissions.TryGetValue(notificationID[1], out currentNotificationData);
//update the current notification Data before we add the new record
//we will take fields from the decrypted notification and insert it back in
currentNotificationData = currentNotificationData.Replace("NOTIFICATIONID", Path.GetFileName(fileName));
currentNotificationData = currentNotificationData.Replace("IDESTRANSID", notificationID[0]);
currentNotificationData = currentNotificationData.Replace("NULL", notificationID[2]);
currentNotificationData = currentNotificationData.Replace("ERRORCOUNT", notificationID[3]);
//add new record with updated information
transmissions.Add(Path.GetFileName(fileName), string.Join(",", currentNotificationData));
//we can remove the old record now
transmissions.Remove(notificationID[1]);
//we will write the current transmissions back into the log file so we keep it updated with the latest information
//write to log
string filePath = @"simplelog.csv";
using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
{
using (TextWriter tw = new StreamWriter(fs))
foreach (KeyValuePair <string, string> kvp in transmissions)
{
tw.WriteLine(string.Format("{0}", kvp.Value));
}
}
//processing of the file is complete
}
//the decrypted files will be moved to the Processed folder for safekeeping
//if no match is found, it moves to the Unmatched subfolder
DirectoryInfo dirProcessing = new DirectoryInfo(xmlProcessingFolder);
if (isFileMatched == true)
{
destinationFolder = xmlProcessedFolder;
if (!Directory.Exists(xmlProcessedFolder + "\\" + notificationFileName))
{
Directory.CreateDirectory(xmlProcessedFolder + "\\" + notificationFileName);
}
matchCounter = matchCounter + 1;
}
else
{
destinationFolder = xmlProcessedUnmatchedFolder;
//if this non-matching file has already been pulled, remove the old and replace with the new
if (Directory.Exists(xmlProcessedUnmatchedFolder + "\\" + notificationFileName))
{
//clean out the folder, it will get the current decrypted contents
DirectoryInfo dir = new DirectoryInfo(xmlProcessedUnmatchedFolder + "\\" + notificationFileName);
foreach (FileInfo fi in dir.GetFiles())
{
fi.Delete();
}
}
else
{
Directory.CreateDirectory(xmlProcessedUnmatchedFolder + "\\" + notificationFileName);
}
unmatchCounter = unmatchCounter + 1;
}
//move from the processing folder
foreach (FileInfo fi in dirProcessing.GetFiles())
{
File.Move(fi.FullName, Path.Combine(destinationFolder, notificationFileName, fi.Name));
}
//Rename the file so we can process it
File.Move(fileName, Path.Combine(destinationFolder, notificationFileName, Path.GetFileName(fileName)));
}
MessageBox.Show(matchCounter + " matching files found\n" + unmatchCounter + " non-matching files found");
}
private void btnDecryptZip_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtNotificationZip.Text) || string.IsNullOrWhiteSpace(txtReceiverCert.Text))
{
// files validation
MessageBox.Show("Either the ZIP file or certificate was not specified!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
string zipFolder = "";
try
{
//Deflate the zip archive
zipFolder = ZipManager.ExtractArchive(txtNotificationZip.Text, txtNotificationFolder.Text);
}
catch (Exception ex)
{
ex.DisplayException(Text);
return;
}
// select encrypted key file
string encryptedKeyFile = "";
string encryptedPayloadFile = "";
string metadataFile = "";
string[] keyFiles = Directory.GetFiles(zipFolder, "*_Key", SearchOption.TopDirectoryOnly);
string[] payloadFiles = Directory.GetFiles(zipFolder, "*_Payload", SearchOption.TopDirectoryOnly);
string[] metadataFiles = Directory.GetFiles(zipFolder, "*_Metadata*", SearchOption.TopDirectoryOnly);
if (keyFiles.Length == 0)
{
// key file validation
MessageBox.Show("There was no file found containing the encrypted AES key!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
if (payloadFiles.Length == 0)
{
// key file validation
MessageBox.Show("There was no file found containing the encrypted Payload!", Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
encryptedKeyFile = keyFiles[0];
encryptedPayloadFile = payloadFiles[0];
metadataFile = metadataFiles[0];
//Check the metadata and see what we have
string metadataContentType = XmlManager.CheckMetadataType(metadataFile);
byte[] encryptedAesKey = null;
byte[] decryptedAesKey = null;
byte[] aesVector = null;
try
{
// load encrypted AES key
encryptedAesKey = File.ReadAllBytes(encryptedKeyFile);
// decrypt AES key & generate default (empty) initialization vector
decryptedAesKey = AesManager.DecryptAesKey(encryptedAesKey, txtReceiverCert.Text, txtRecKeyPassword.Text);
aesVector = AesManager.GenerateRandomKey(16, true);
if (radECB.Checked != true)
{
aesVector = decryptedAesKey.Skip(32).Take(16).ToArray();
decryptedAesKey = decryptedAesKey.Take(32).ToArray();
}
// decrypt encrypted ZIP file using decrypted AES key
string decryptedFileName = encryptedPayloadFile.Replace("_Payload", "_Payload_decrypted.zip");
AesManager.DecryptFile(encryptedPayloadFile, decryptedFileName, decryptedAesKey, aesVector, radECB.Checked);
//Deflate the decrypted zip archive
ZipManager.ExtractArchive(decryptedFileName, decryptedFileName, false);
string decryptedPayload = decryptedFileName.Replace("_Payload_decrypted.zip", "_Payload.xml");
//If the metadata is something other than XML, read the wrapper and rebuild the non-XML file
if (metadataContentType != "XML")
{
//Some non-XML files may not have _Payload in the file name, if not remove it
if (!File.Exists(decryptedPayload))
{
decryptedPayload = decryptedPayload.Replace("_Payload.xml", ".xml");
}
//This will give us the base64 encoded data from the XML file
string encodedData = XmlManager.ExtractXMLImageData(decryptedPayload);
//We will convert the base64 data back to bytes
byte[] binaryData;
string decodedPayload = decryptedPayload.Replace(".xml", "." + metadataContentType);
binaryData = System.Convert.FromBase64String(encodedData);
//We can write the bytes back to rebuild the file
FileStream decodedFile;
decodedFile = new FileStream(decodedPayload, System.IO.FileMode.Create, System.IO.FileAccess.Write);
decodedFile.Write(binaryData, 0, binaryData.Length);
decodedFile.Close();
}
// success
MessageBox.Show("Notification decryption process is complete!", Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
ex.DisplayException(Text);
}
finally
{
if (encryptedAesKey != null)
{
encryptedAesKey = null;
}
if (decryptedAesKey != null)
{
decryptedAesKey = null;
}
if (aesVector != null)
{
aesVector = null;
}
}
}