Writing AES Key And Encrypted Data To Same MemoryStream Not Working
Jun 24, 2011
I'm attempting to use symmetric encryption to encrypt some data, and store the key necessary to decrypt with the data in a MemoryStream. (While I know that this alone is really dumb security-wise, I'm going to use RSA to encrypt the symmetric key. Right now, though, I'm trying to just get this part to work.)I'm using the FileHelpers library to parse the data for my delimiter (the semicolon, as I don't believe I'll ever have a semicolon in the data). Unfortunately, in my decryption function, when it's parsing, it only returns back one record. And, if I show the entire string of encrypted data created at the end of this function, it doesn't appear to be using multiple records.I'm wondering if when I create the new cryptostream, it's defaulting to the beginning of the memory stream, so when I write my encrypted data, it overwrites the data I had just written to the memory stream.[code]
I have to make files encrypt in my application. Now, I'm writing the encrypted data to temporary files (fsOutput in the code). I upload this file by FTP to the server. How should I rewrite my code if I want to upload without creating a temporary file and by using stream? My FTP client is able to upload from stream. My FTP client uses PutFile method to upload files ('Upload from stream by StarkSoft ftp.net in my code)
I've tried rewriting this code several times, it spits out the bytes correctly, but then when trying to read the array created from the memory stream, it's empty, what am I doing wrong?
Dim bytes() As Byte = System.Text.Encoding.ASCII.GetBytes("test this shit") Dim bytesString As String = "" Dim i As Integer = 0 i = 0 Dim byteStream As New System.IO.MemoryStream
I am attempting to find some code to use in VB.NET to decrypt a string that has been encrypted using the Java crypto libary.All of the code I have found so far uses an Initialisation Vector and Key to decrypt but the string has been encrypted using the Key only. (Using an Initialisation Vector is apperently an optional step in Java).Does anyone know of code that I can use (preferably in VB.NET but i could convert C#) to decrypt AES 128 Bit encoded string without an Initialisation Vector?
Is there something that needs to be done with the following code to release the memory it uses?
Dim objImage As MemoryStream Dim objwebClient As WebClient Dim sURL As String = Trim(m_StationInterface.PicLocation)
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The code is on a popup form that shouldn't ever get disposed. A new image is loaded onto the form every time it pops up. However, the process size for the application continues to grow each time it makes it through that code block.
I've tried objImage.Close() and .Flush(), objWebClient.Dispose(). The process size still grows by a good 4mb after every call. It's like the old image is kept in memory.
I'm facing this peculiar problem since the past two days and now it is driving me nuts.I initialize a StreamReader from a MemoryStream object. When I move the seek pointer to beginning, the first time it is OK, but from 2nd time onwards I see an extra bad character at the beginning of stream that obviously should not be there.This doesn't happen with StreamReader initialized with other constructors like directly passing filename etc.I constructed a small program to demonstrate this. I added 2 buttons to a form and this code. When I run this code, clicking Button1 shows extra character at the beginning of string after ResetSeekPointer() function has been called at-least twice. This doesn't happen when I click Button2
vb.net Imports System.IOImports System.XmlImports System.Xml.XslImports System.Xml.SchemaImports System.Collections.Genericublic Class Form1Private myStreamReader As
As we pass data to a database in a clear cut way, there may be situations, when we might fear data stealing. So can we simply encrypt data at the time of insertion, so that the data privacy will be maintained and the front end can only see the data.
I have been using RSACryptoServiceProvider and was using the template code provided from the MSDN resource page.url...I wanted to encrypt the data on my computer and transfer the data to the FTP server and have it decrypted there. I have the encryption and decryption code but it is in the same program and only work during the instance it is open. The intention is to have a program that will encrypt and send the data to the FTP Server. There will also be a VB Script on the server to decrypt the data and store it in a separate location. How do I get it to store the public key on my computer and the private key on the server? Also, how to I transfer the encrypted data over to the FTP and have it saved there?The purpose of this project is that we have people located over the globe and are sending sensitive information to an FTP server at the home office. My boss has insisted on the data being encrypted before sending anything. But, on the server it will be decrypted so that a select few can go through the information.
Before storing information into the database I encrypt strings. It's the problem, is it possible to generate and show these encrypted data in CrystalReporter? (I want to show decrypted data)
Hey guys, I am trying to send data from client to server (encrypted) and the string sent from the client is not the same as recieved from the server. I've been killing my brain for hours to get this to work but I cant manage. Im converting everything to Base64 string.
Client:
Public Sub SendMessage(ByVal msg As String) Try SyncLock myclient.GetStream sw = New IO.StreamWriter(myclient.GetStream)
I am working on a program for work and I am stuck on trying to make a new XML file from VB.NET 2010. I have the old code which was done in C# and it works but even using a C# to VB converter didn't help. I will paste in both the C# and what I have in VB
I want to be able to click on the save icon and have the data on the form save to the original database. Right now I seem to have a disconnected dataset I have tried to change everything from read only to a false statement but it just will not work. It saves to the form fine just not the orignial data base.
I have 10 panels on a form and I was wondering if there is a more efficient way to loop through them to pass the data to my procedure instead of writing out each one the way I am doing
' sample shows only 3 but there are 10 For i As Integer = 1 To 3 Select Case i Case 1
I am trying to write the TOURN structure and then read the TOURN structure back in.. the file gets created on my desktop and the program does not have any syntax errors, but when I READ the file none of the Data gets retrieved. So I am not sure if the DATA was actually saved or it is just not being retrieved?? This is what I have coded so far...
I am doing the project to make a microcontroller communicate with PC. I am facing the problem writing the C++ code for command button to ask uC to display the data in my label. How to write the code for C++ to get the data from the microcontroller?
i'm using a C8051F320-dk which already have a USB connector and a RTC.
my data will be the date, and time provided from the RTC.
I currently have a program that, when I select an option from a drop down menu, will transmit a character to a microcontroller. I then have to click another option after 10 seconds to send another character. What I would like to do is modify this program to transmit one character for a period of 10 seconds, then transmit another value for another 10 seconds and so on for a defined period of time, say 30 seconds in total.
I am trying to write data back to my database in my project, but it keeps disappering when I make any changes to code. I can build the project, add data, close the project and build it again and the data is still there. But as soon as I make any changes to anything, on the next build, all of the data is gone.
The table will not be bound to any controls in the final project, but for testing purposes I have a datagrid control that it is bound to. My code started as follows:
I am having trouble writing information to a 2007 access database. I just want to write a numeric value into a data base. My table name is KW and my field is also referred to as Kw.
Dim theOleDbConnection As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;" & _ "Data Source=C:\Documents and Settings\HP_Administrator\My Documents\value.accdb") Dim theOleDbCommand As New OleDbCommand("INSERT INTO[KW] (Kw)VALUES (@P1)") theOleDbCommand.Connection = theOleDbConnection
I have data that has to be collected from my database and sent to a supplier's edi system. The file has to be in ascii format so their system can read it. I am writing what I see as an ascii format file but they say it's in edibc format when they receive it. I am posting my code and hopefully somebody here can help me out. Funny thing is that I have done this before successfully and am using virtually the same code but to no avail!!
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim filed As String = "Y" ' get records to be transmitted and plop them into an array list Dim con As VICSClaimDAO = New VICSClaimDAOSQL()
I want to import my data, which I receive over USB (every second), to an Excel sheet. Thing is, I want to open only one Excel file and write everything to this one file, and by pressing a "STOP" button, data reception will be canceled and data in the Excel file should be saved and Excel file should close right after that. Here my code,
Dim excel_cnt as Integer<br/>Dim sv_var as Integer = 0<br/><br/>Sub write_to_excel() Dim xl As New Excel.Application
I'm having problem while writing data to serial port. This piece of code is meant to write all the integer numbers in a text file to the SerialPort (connected to a USB-Serial Converter) when StartButton is clicked. However, it only managed to send two numbers and stopped at "USBSerialPort.Write(t, 0, 2)".
Private Sub StartButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles StartButton.Click USBSerialPort.DiscardOutBuffer()
I am having an issue using BinaryFormatter.Serialize. I have this generic extension method to "clone" an object via binary serialization:
[Code]...
This is killing performance. Anything more that about 7 or 8 clones brings the app to a halt. Why would this happen? The USING block ought to ensure the MemoryString is disposed of, right? Shouldn't a new MemoryString be created each time? I would think since the same original Mode object is the source for the serialization, the MemoryString length would be the same.
I'm working on a project to extract documents from a SQL Database and writing those documents to a network drive. However some of the files pointed at in the DB are encrypted files (RijndaelManaged)that reside on another network driveI have been able to retrieve, and decrypt the files using streams. Now aving problems saving or converting the Memorystream into an actual file.
Here is my code Public Sub ExtractDocument(ByVal ThisDocumentInfo
I'm working on a project in VB.Net (2010) where I'm extracting files from an Document Management System.The Files reside on the network, and information about the files are in a SQL 2005 Database and have been encrypted with the Encryption Stream (System. Security. Cryptography. Rijndael Managed)i have retrieved the file, and decrypted them, but I'm trying to find out how to write the stream back to a file.I know the file type (which is stored in a SQL DB)I can't find a solution in any of the VB files or the MS site.
I am dynamically creating an pdf from a memorystream to a web browser, using itextsharp. It is called via https and it works in IE and Firefox but not Safari or Opera. I don't care about Opera but I do want it to work in Safari though. If I make the call with http it does work (creates the pdf) in Safari but not https The error I get is The error is: unknown error (CFURLErrorDomain:303).
