I want to encrypt an exe file (file.exe), write the encrypted version to a text file (fileenc.txt) and decrypt the data in the text file back to another exe file (filedec.exe).
file.exe and filedec.exe are the same and are expected to function the same way.
However, when I try to do this the filedec.exe does not work. Error Popup says: "This app cannot run on your PC".
Please what could be the problem?
However, when I just read the file.exe, write to fileenc.txt without encryption or decryption, and then read fileenc.txt and write data to filedec.exe without encryption or decryption, filedec.exe seems to work fine.
Also, when I try encrypting and decrypting a text file with this code, it works fine too.
But when I encrypt and decrypt an exe on the fly, filedec.exe doesn't work.
Please help me out. Thank you everyone.
Here is my full code:
Main();
function Main() {
var arrKey;
arrKey = "encryptionkey";
//Encrypt file.exe and write the encrypted form to file.txt
Crypt( "C:\\...\\file.exe", "C:\\...\\fileenc.txt", arrKey );
//Decrypt the previously encrypted file.txt and write the decrypted form to filedec.exe
Crypt( "C:\\...\\fileenc.txt", "C:\\...\\filedec.exe", arrKey );
//NOTE: file.exe and filedec.exe are expected to work fine when executed
}
function Crypt(fileIn, fileOut, key) {
var fileInRead;
//Read fileIn
var adTypeBinaryRead = 1;
var BinaryStreamRead;
BinaryStreamRead = new ActiveXObject("ADODB.Stream");
BinaryStreamRead.Type = adTypeBinaryRead;
BinaryStreamRead.Open();
BinaryStreamRead.LoadFromFile(fileIn);
fileInRead = BinaryStreamRead.Read();
//Convert fileIn binary data to string
var objRS = new ActiveXObject("ADODB.Recordset");
var DefinedSize = 1024;
var adSaveCreateOverWrite = 2;
var adFldLong = 0x80;
var adVarChar = 201;
var adTypeText = 2;
objRS.Fields.Append("filedata", adVarChar, DefinedSize, adFldLong);
objRS.Open();
objRS.AddNew();
objRS.Fields("filedata").AppendChunk(fileInRead);
var binString = objRS("filedata").value;
objRS.close();
//Make key as long as string version of fileIn
while (key.length < binString.length) {
key += key;
}
key = key;
//crypt converted string with key
var k, ss, q;
var cryptresult = "";
i = 0;
for (var index = 0; index < binString.length; index++) {
k = key.substr(i, 1);
q = binString.substr(i, 1);
ss = q.charCodeAt(0);
cryptresult = cryptresult + String.fromCharCode(q.charCodeAt(0) ^ k.charCodeAt(0));
i = i +1;
}
// write crypted string to file
var outStreamW = new ActiveXObject("ADODB.Stream");
outStreamW.Type = adTypeText;
// Charset: the default value seems to be `UTF-16` (BOM `0xFFFE` for text files)
outStreamW.Open();
outStreamW.WriteText(cryptresult);
outStreamW.Position = 0;
var outStreamA = new ActiveXObject("ADODB.Stream");
outStreamA.Type = adTypeText;
outStreamA.Charset = "windows-1252"; // important, see `cdoCharset Module Constants`
outStreamA.Open();
outStreamW.CopyTo(outStreamA); // convert encoding
outStreamA.SaveToFile(fileOut, adSaveCreateOverWrite);
outStreamW.Close();
outStreamA.Close();
}
EDIT:
More troubleshooting into my code shows that when I encrypt and decrypt file.exe ON THE FLY, and then write the decrypted data to fileenc.exe, fileenc.exe works well.
But when I encrypt file.exe and write the encrypted data to fileenc.txt and then read the fileenc.txt, decrypt the read encrypted data and write to fileenc.exe (just like in my code), fileenc.exe gets corrupted. My understanding suggests that the manner through which I write the encrypted data to fileenc.txt could be the problem here.
Please I need help, how do I go about with this.
I'm using ClosedXML library to generate a simple Excel file with 2 worksheets.
I keep getting error message whenever i try to open the file saying
"We found a problem with some content in "example.xlsx". Do you want us to try to recover as much as we can. if you trust source of this workbook, click Yes"
If i click Yes, it displays the data as expected, i don't see any
problems with it. Also if i generate only 1 worksheet this error does
not appear.
This is what my stored procedure returns, first result set is populated in sheet1 and second result set is populated in sheet2, which works as expected.
Workbook data
Here is the method i am using, it returns 2 result sets and populates both result sets in 2 different worksheets:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult POAReport(POAReportVM model)
{
POAReportVM poaReportVM = reportService.GetPOAReport(model);
using (var workbook = new XLWorkbook())
{
IXLWorksheet worksheet1 = workbook.Worksheets.Add("ProductOrderAccuracy");
worksheet1.Cell("A1").Value = "DATE";
worksheet1.Cell("B1").Value = "ORDER";
worksheet1.Cell("C1").Value = "";
var countsheet1 = 2;
for (int i = 0; i < poaReportVM.productOrderAccuracyList.Count; i++)
{
worksheet1.Cell(countsheet1, 1).Value = poaReportVM.productOrderAccuracyList[i].CompletedDate.ToString();
worksheet1.Cell(countsheet1, 2).Value = poaReportVM.productOrderAccuracyList[i].WebOrderID.ToString();
worksheet1.Cell(countsheet1, 3).Value = poaReportVM.productOrderAccuracyList[i].CompletedIndicator;
countsheet1++;
}
IXLWorksheet worksheet2 = workbook.Worksheets.Add("Summary");
worksheet2.Cell("A1").Value = "Total Orders Sampled";
worksheet2.Cell("B1").Value = "Passed";
worksheet2.Cell("C1").Value = "% Passed";
worksheet2.Cell(2, 1).Value = poaReportVM.summaryVM.TotalOrdersSampled.ToString();
worksheet2.Cell(2, 2).Value = poaReportVM.summaryVM.Passed.ToString();
worksheet2.Cell(2, 3).Value = poaReportVM.summaryVM.PassedPercentage.ToString();
//save file to memory stream and return it as byte array
using (var ms = new MemoryStream())
{
workbook.SaveAs(ms);
ms.Position = 0;
var content = ms.ToArray();
return File(content, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
}
}
}
I had similar problem. For me the cause was as mentioned in this answer:
I had this issue when I was using EPPlus to customise an existing template. For me the issue was in the template itself as it contained invalid references to lookup tables. I found this in Formula -> Name Manager.
You may find other solutions there.
Apologies as my reputation is too low to add a comment.
I am currently working on a C# forms application that needs to access a specific cookie on my computer, which I can do perfectly fine. Here's the issue:
Google stores cookies in SQLite, and I've downloaded Sqlite database browser to help me look at these values. What surprises me is that about half of the cookie values shows as empty (including the one I need), even though they are obviously not.
The db file is located at:
C:\Users\%username%\AppData\Local\Google\Chrome\User Data\Default\Cookies
On Chrome I have an addon called "Edit This Cookie" which allows me to directly modify cookies on the website I'm on. This addon can read these cookies, and the web browser can parse values through HTTP when needed for different requests, so they are definitely there - still, the SQLite browser, and my custom code both come to the conclusion that the particular value field is empty.
Why is that?
What is it that somehow prevents the field from being read by certain applications?
I've run into this same problem, and the code below provides a working example for anyone who is interested. All credit to Scherling, as the DPAPI was spot on.
public class ChromeCookieReader
{
public IEnumerable<Tuple<string,string>> ReadCookies(string hostName)
{
if (hostName == null) throw new ArgumentNullException("hostName");
var dbPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + #"\Google\Chrome\User Data\Default\Cookies";
if (!System.IO.File.Exists(dbPath)) throw new System.IO.FileNotFoundException("Cant find cookie store",dbPath); // race condition, but i'll risk it
var connectionString = "Data Source=" + dbPath + ";pooling=false";
using (var conn = new System.Data.SQLite.SQLiteConnection(connectionString))
using (var cmd = conn.CreateCommand())
{
var prm = cmd.CreateParameter();
prm.ParameterName = "hostName";
prm.Value = hostName;
cmd.Parameters.Add(prm);
cmd.CommandText = "SELECT name,encrypted_value FROM cookies WHERE host_key = #hostName";
conn.Open();
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
{
var encryptedData = (byte[]) reader[1];
var decodedData = System.Security.Cryptography.ProtectedData.Unprotect(encryptedData, null, System.Security.Cryptography.DataProtectionScope.CurrentUser);
var plainText = Encoding.ASCII.GetString(decodedData); // Looks like ASCII
yield return Tuple.Create(reader.GetString(0), plainText);
}
}
conn.Close();
}
}
}
Alright, so in case anyone is interested, I found a solution to this problem after alot of trial, error and googling.
Google Chrome cookies DB has 2 columns for storing values: "value" and "encrypted_value", the latter being used when the cookie stored was requested to be encrypted - often the case with certain confidential information and long-time session keys.
After figuring this out, I then needed to find a way to access this key, stored as a Blob value. I found several guides on how to do this, but the one that ended up paying of was: http://www.codeproject.com/Questions/56109/Reading-BLOB-in-Sqlite-using-C-NET-CF-PPC
Simply reading the value is not enough, as it is encrypted. - Google Chrome uses triple DES encryption with the current users password as seed on windows machines. In order to decrypt this in C#, one should use Windows Data Protection API (DPAPI), there are a few guides out there on how to make use of it.
Like Jasper's answer, in a PowerShell script (of course, customize the SQL query to your needs, and the path to your cookies location):
$cookieLocation = 'C:\Users\John\AppData\Local\Google\Chrome\User Data\Default\cookies'
$tempFileName = [System.IO.Path]::GetTempFileName()
"select writefile('$tempFileName', encrypted_value) from cookies where host_key = 'localhost' and path = '/api' and name = 'sessionId';" | sqlite3.exe "$cookieLocation"
$cookieAsEncryptedBytes = Get-Content -Encoding Byte "$tempFileName"
Remove-Item "$tempFileName"
Add-Type -AssemblyName System.Security
$cookieAsBytes = [System.Security.Cryptography.ProtectedData]::Unprotect($cookieAsEncryptedBytes, $null, [System.Security.Cryptography.DataProtectionScope]::CurrentUser)
$cookie = [System.Text.Encoding]::ASCII.GetString($cookieAsBytes)
$cookie
So I wanted to do this without writing to a tempfile every time but also without implementing a separate class as per jasper's solution. Like jasper, I found it easier and quicker to access the System.Data.SQLite.dll available here. It's not as elegant as a separate class, but it's what worked best for me:
Add-Type -AssemblyName System.Security
Add-Type -Path 'C:\Program Files\System.Data.SQLite\2015\bin\x64\System.Data.SQLite.dll'
Function Get-Last-Cookie {
Param(
[Parameter(Mandatory=$True)] $valueName,
[Parameter(Mandatory=$True)] $hostKey,
[Parameter(Mandatory=$True)] $dbDataSource
)
$conn = New-Object -TypeName System.Data.SQLite.SQLiteConnection
$conn.ConnectionString = "Data Source=$dbDataSource"
$conn.Open()
$command = $conn.CreateCommand()
$query = "SELECT encrypted_value FROM cookies WHERE name='$valueName' `
AND host_key='$hostKey' ORDER BY creation_utc DESC LIMIT 1"
$command.CommandText = $query
$adapter = New-Object -TypeName System.Data.SQLite.SQLiteDataAdapter $command
$dataset = New-Object System.Data.DataSet
[void]$adapter.Fill($dataset)
$command.Dispose();
$conn.Close();
$cookieAsEncryptedBytes = $dataset.Tables[0].Rows[0].ItemArray[0]
$cookieAsBytes = [System.Security.Cryptography.ProtectedData]::Unprotect($cookieAsEncryptedBytes, $null, [System.Security.Cryptography.DataProtectionScope]::CurrentUser)
return [System.Text.Encoding]::ASCII.GetString($cookieAsBytes)
}
$localAppDataPath = [Environment]::GetFolderPath([Environment+SpecialFolder]::LocalApplicationData)
$cookieDbPath = 'Google\Chrome\User Data\Default\Cookies'
$dbDataSource = Join-Path -Path $localAppDataPath -ChildPath $cookieDbPath
$plainCookie = Get-Last-Cookie 'acct' '.stackoverflow.com' $dbDataSource
Write-Host $plainCookie
I also found the Add-SqliteAssembly function by halr9000 to be very helpful when it came time to schedule my script in the windows task scheduler and realized that the task scheduler runs the x86 version of PowerShell and thus SQLite rather than the x64 I was using in the console.
The thing is that Google Chrome encrypts the data you need to read, so you have to decrypt it.
First, get a copy of the cookies file. Then read it using SQLite3. After that, get the encrypted bytes. And last, use the code below to decrypt it.
You'll need these Nugets:
using System.IO;
using System.Net;
using System.Data.SQLite;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Modes;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto;
using Newtonsoft.Json.Linq;
The code so far:
File.Copy(Environment.GetEnvironmentVariable("APPDATA") + #"/../Local/Google/Chrome/User Data/Default/Cookies", #"./Cookies",true);
SQLiteConnection Cnn = new SQLiteConnection("Data Source=" + #"./Cookies" + ";pooling=false");
Cnn.Open();
SQLiteCommand cmd = new SQLiteCommand("SELECT host_key, name, value, encrypted_value FROM cookies WHERE name='mvrusername' OR name='mvrcookie' OR name='mikuki4'", Cnn);
SQLiteDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
byte[] encryptedData = (byte[])rdr["encrypted_value"];
string encKey = File.ReadAllText(Environment.GetEnvironmentVariable("APPDATA") + #"/../Local/Google/Chrome/User Data/Local State");
encKey = JObject.Parse(encKey)["os_crypt"]["encrypted_key"].ToString();
var decodedKey = System.Security.Cryptography.ProtectedData.Unprotect(Convert.FromBase64String(encKey).Skip(5).ToArray(), null, System.Security.Cryptography.DataProtectionScope.LocalMachine);
const int MAC_BIT_SIZE = 128;
const int NONCE_BIT_SIZE = 96;
using (var cipherStream = new MemoryStream(encryptedData))
using (var cipherReader = new BinaryReader(cipherStream))
{
var nonSecretPayload = cipherReader.ReadBytes(3);
var nonce = cipherReader.ReadBytes(NONCE_BIT_SIZE / 8);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(decodedKey), MAC_BIT_SIZE, nonce);
cipher.Init(false, parameters);
var cipherText = cipherReader.ReadBytes(encryptedData.Length);
var plainText = new byte[cipher.GetOutputSize(cipherText.Length)];
try
{
var len = cipher.ProcessBytes(cipherText, 0, cipherText.Length, plainText, 0);
cipher.DoFinal(plainText, len);
}
catch (InvalidCipherTextException)
{
}
string _cookie= Encoding.Default.GetString(plainText);
}
}
// Big thanks to https://stackoverflow.com/a/60611673/6481581 for answering how Chrome 80 and up changed the way cookies are encrypted.
# this powershell scripts exports your cookies to a format curl and wget understand
# Obs ! Each profile has its own cookes file , replace me (ysg ;o) with your win usr name
# aka wget -x --load-cookies cookies.txt http://stackoverflow.com/questions/22532870/encrypted-cookies-in-chrome
$cookieLocation = 'C:\Users\ysg\AppData\Local\Google\Chrome\User Data\Profile 1\Cookies'
$curl_cookies_file="C:\var\ygeo.reports.app.futurice.com.cookies.doc-pub-host.txt"
$tempFileName1 = [System.IO.Path]::GetTempFileName()
$tempFileName2 = [System.IO.Path]::GetTempFileName()
# adjust your filter in the where clause ...
"select writefile('$tempFileName1', encrypted_value) from cookies where host_key = '.futurice.com' ;" | sqlite3.exe "$cookieLocation"
$cookieAsEncryptedBytes = Get-Content -Encoding Byte "$tempFileName1"
Remove-Item "$tempFileName1"
Add-Type -AssemblyName System.Security
$cookieAsBytes = [System.Security.Cryptography.ProtectedData]::Unprotect($cookieAsEncryptedBytes, $null, [System.Security.Cryptography.DataProtectionScope]::CurrentUser)
$cookie = [System.Text.Encoding]::ASCII.GetString($cookieAsBytes)
$unquoted_cookie=$cookie -replace '"', ""
# adjust your filter in the where clause ...
"
select
host_key
, CASE WHEN httponly=0 THEN 'FALSE' ELSE 'TRUE' END
, path
, CASE WHEN secure=0 THEN 'FALSE' ELSE 'TRUE' END
, expires_utc
, name
, '$unquoted_cookie'
from cookies where host_key = '.futurice.com' ;" | sqlite3.exe -separator " " "$cookieLocation" > $curl_cookies_file
Get-ChildItem *.txt | ForEach-Object { (Get-Content $_) | Out-File -Encoding ASCII $_ }
# check the meta data table
#"PRAGMA table_info([cookies]);" | sqlite3.exe "$cookieLocation"
# src: https://github.com/daftano/cookies.txt/blob/master/src/popup.js
#content += escapeForPre(cookie.domain);
#content += "\t";
#content += escapeForPre((!cookie.hostOnly).toString().toUpperCase());
#content += "\t";
#content += escapeForPre(cookie.path);
#content += "\t";
#content += escapeForPre(cookie.secure.toString().toUpperCase());
#content += "\t";
#content += escapeForPre(cookie.expirationDate ? Math.round(cookie.expirationDate) : "0");
#content += "\t";
#content += escapeForPre(cookie.name);
#content += "\t";
#content += escapeForPre(cookie.value);
#content += "\n";
#
#0|creation_utc|INTEGER|1||1
#1|host_key|TEXT|1||0
#2|name|TEXT|1||0
#3|value|TEXT|1||0
#4|path|TEXT|1||0
#5|expires_utc|INTEGER|1||0
#6|secure|INTEGER|1||0
#7|httponly|INTEGER|1||0
#8|last_access_utc|INTEGER|1||0
#9|has_expires|INTEGER|1|1|0
#10|persistent|INTEGER|1|1|0
#11|priority|INTEGER|1|1|0
#12|encrypted_value|BLOB|0|''|0
#13|firstpartyonly|INTEGER|1|0|0
Just set "value" to the cookie you want, "encrypted_value" to NULL and "priority" to 0
Is there a library or code somewhere that does that?
Some questions suggest software like Convert a PDF to a Transparent PNG with GhostScript
I need something that's done by program. So my site, which is an asp site, should have a function
function PNGfromPDF (someFile as String) as PNGSomething
end function
Something like that.
Any open source solution for that?
Try:
PdfDocument inputDocument = PdfReader.Open(fileNames[i], PdfDocumentOpenMode.Import);
// for each page create a new PDF file and save it on the disk
for (int pageCount = 0; pageCount < inputDocument.PageCount; pageCount++)
{
fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileNames[i]);
fileName = string.Format("{0}\\Documents\\{1}", Session.CentralWorkingDirectory, String.Format("{0} ({1}-{2}).pdf", fileNameWithoutExtension, pageCount + 1, inputDocument.PageCount));
pdfFile = PDFFile.Open(fileName);
pdfFile.SerialNumber = Configurations.PDFVIEW_KEY;
// Get image file name
string imageFileName = string.Format("{0}.png", fileName.Remove(fileName.Length - 4));
// If thumbnail already exists delete it
if (File.Exists(imageFileName))
{
File.Delete(imageFileName);
}
// Convert page to PNG and save it.
//Bitmap pageImage = pdfFile.GetPageImage(0, 32);
Bitmap pageImage = pdfFile.GetPageImage(0, 92);
pageImage.Save(imageFileName, ImageFormat.Png);
// Cleanup resources
pageImage.Dispose();
pdfFile.Dispose();
}
Here I am using below namespace...
using PdfSharp.Drawing;
using O2S.Components.PDFRender4NET; // Thrid party components so you use PDF sharp with this componets
using System.Drawing.Imaging;
I am using the youtube api to direct upload videos like this:
YouTubeRequestSettings setting = new YouTubeRequestSettings("devpa", key, "user", "pass");
YouTubeRequest req = new YouTubeRequest(setting);
Video ytv = new Video();
ytv.Title = "test video1";
ytv.Tags.Add(new MediaCategory("Autos", YouTubeNameTable.CategorySchema));
ytv.Keywords = "test, dev";
ytv.Description = "this is a test video";
ytv.YouTubeEntry.Private = true;
ytv.YouTubeEntry.MediaSource = new MediaFileSource(Server.MapPath("PATH"), "video/mp4");
Video createdVideo = req.Upload(ytv);
But every time i get this error:
Cannot close stream until all bytes are written
Even though *i am uploading small videos with different extinctions (flv,mp4 ..etc) *, what is the problem?
Thanks
You need to set timeout. Like ytv.TimeOut = 100000000;
Actually set the instance of
YouTubeRequestSettings.Timeout = [A LARGER NUMBER]
That's the setting you'll want to use.