private void CreateHomomorphicTree()
{
try
{
HATTree <string> HTree = new HATTree <string>();
HTree.CreateTree(ApplicationState.FileManager.CurrentSelectedFile.FileBlocks.ToList());
List <HATNode <string> > nodes = HTree.PreOrderTraversal();
StringBuilder compleString = new StringBuilder();
foreach (HATNode <string> item in nodes)
{
string logText = item.Index + "\t" + item.LeafNodesCount + "\t " + item.Version + "\t" + item.Tag + "\r\n";
compleString.Append(logText);
}
HomomorphicTextLog = compleString.ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
private void ExecutePoSCommand(Object data)
{
try
{
StringBuilder logger = new StringBuilder();
this.challangedIndexes.Clear();
string[] stringItems = this.commaSepratedBlockIndexes.Split(',');
logger.AppendLine("Challanged Indexes for file blocks: ");
foreach (var item in stringItems)
{
int index = int.Parse(item);
this.challangedIndexes.Add(index);
logger.Append(index.ToString() + " ");
}
logger.AppendLine("Get the list of file blocks with version information");
List <FileBlock> fileBlocks = selectedFile.getFileBlocksForUser(SelectedUser, this.challangedIndexes);
List <FileBlock> cloudRecievedFileBlocks = new List <FileBlock>();
foreach (FileBlock fileBlock in fileBlocks)
{
logger.AppendLine();
logger.AppendLine("File block: " + fileBlock.Index + " , Version: " + fileBlock.Version + " , known content Hash: " + fileBlock.ContentHash);
string location = SelectedFile.GetCloudLocationForVersion(fileBlock.Version);
string hashRecievedFromCloudContent = Utility.ToString(Utility.ComputeHashSumForFile(location + "//" + fileBlock.Index), true);;
logger.AppendLine("Getting File block from cloud: " + fileBlock.Index + " , Cloud content Hash: " + fileBlock.ContentHash);
logger.AppendLine("Verifying hash :" + string.Compare(hashRecievedFromCloudContent, fileBlock.ContentHash));
// We are creating the empty file block which have hash recieved from cloud
cloudRecievedFileBlocks.Add(new FileBlock(fileBlock.FileHashID, fileBlock.Index, fileBlock.Size)
{
ContentHash = hashRecievedFromCloudContent
});
}
try
{
// We are creatinng Homomorphic authenticated tree for requested and calculated top node hash code
logger.AppendLine("Cloud creatinng Homomorphic authenticated tree for challanged indexes");
HATTree <string> HTreeCloud = new HATTree <string>();
HTreeCloud.CreateTree(cloudRecievedFileBlocks);
logger.AppendLine("Cloud Homomorphic authenticated tree root node hash :" + HTreeCloud.Root.Hash);
logger.AppendLine("Locally creatinng Homomorphic authenticated tree for challanged indexes");
HATTree <string> HTreeLocal = new HATTree <string>();
HTreeLocal.CreateTree(fileBlocks);
logger.AppendLine("Locally created Homomorphic authenticated tree root node hash :" + HTreeLocal.Root.Hash);
if (HTreeCloud.Root.Hash == HTreeLocal.Root.Hash)
{
logger.AppendLine("Root hash matched. Content same");
}
else
{
logger.AppendLine("Root hash failed to match. Content differs");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
Log = logger.ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error");
}
}
