.net - Translating C Code Using OpenSSL For Public-key Authentication To VisualBasic.NET Using System.security.cryptography?
Oct 20, 2009
I am trying to mimic the results of some C code that uses the OpenSSL library using the system.security.crytography library in the .net 3.5 world, and I can't seem to get it right. part of the issue is my understanding of crytography in general.
Here's what is supposed to happen:
I send a request for authentication to a device.It returns a challenge digest, which I then need to sign with a known key and return The device returns a "success" or "Fail" message.I have the following code snippet that I am trying to "copy":
[Code]...
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Aug 26, 2009
I realize AesCryptoServiceProvider is part of .NET framework 3.5. I do have 3.5 installed. However, (I can't believe I don't know this), how can I utilized Framework 3.5 so I can access the AesCryptoServiceProvider? Currently, it points to 2.0.
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Feb 16, 2010
I'm working on a basic file encryption by using the Imports System.Security.Cryptography.I was thinking of putting a password as a final security measure.Would i have to store the password inside the file or how will this work?
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Jul 7, 2010
For my applications I use the following class:
Imports System.Security.Cryptography
Imports System.IO
Imports System.Text
'SymmCrypto is a wrapper of System.Security.Cryptography.SymmetricAlgorithm
[code]....
Most of the time this works as it should, but sometimes it encodes a string and the gives an error on decoding it. The error message is: Invalid length for a Base-64 char array.
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Jan 4, 2012
System.Security.Cryptography.CryptographicException: Length of the data to decrypt is invalid.
My Code:
' Decrypt textfile with Rijndael encryption
Public
[code].....
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Apr 10, 2012
i wanna generate an HTPASSWD file for my Server to secure a directory. For Crypt im using DesEncrypt Method , here is my Code :
[Code]...
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Jul 27, 2010
I am getting the following error message when I try to call this program from a shared drive on our network;
System.Security.SecurityException: System.Security.Permissions.SecurityPermission
at EMAILVB.EmialVB.EmailVB_Load(Object sender, EventArgs e)
[code]....
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Apr 1, 2009
I'm writing an application which has user authentication system, basically, when the user open the software, he has to enter his/hers username and password which are retrieved form a access data base, and if the user is set as admin then it enable some features, I couldn't figure out how to read the column lets say, IsAdmin table, which will store an value of 1 or 0 for example. I need a concept of how build a login system with levels or whatever you guys call it...
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Aug 6, 2009
I am translating a piece of C# code into VB.NET using online convertors..[code]The VB.NET translation is not up to the mark and gives compiler errors Any VB.NET expert who can suggest what to change to make the code compile?url.
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Apr 16, 2012
Just a quick question, what will this code be in vb.net? if this is the wrong place for this request.
[Code]...
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Aug 22, 2009
I typically develop in C# and am quite accustom to using System.IO. I recently ran across the FileIO library and have found that some of the advantages (such as sending an item to the recycle bin) are quite nice to have. Especially in the program I am currently working on.My question is, Does System.IO out perform the VisualBasic.FileIO?My program I am writing will be copying literally TB's worth of information onto server towers. I want to make sure I do not lose any time due to the library I am using.
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Feb 10, 2011
I can access a module from code behind but not from the aspx page in inline VB code <% ... %>.
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Feb 19, 2012
I have almost completed a translation from C# to VB.NET, however, I run into some small errors[code]...
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Nov 4, 2010
im making a md5 cryptology for a program, it work in everyform exept this one..
Imports System.Net.Mail
Imports System.Net.FtpWebRequest
Imports System.Net
[code]....
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Feb 26, 2012
I'm a beginner to Visual Basic. In here I want to recreate a piggy bank which tells me how much money do I have. I created a function but the program tells me :
[Code]...
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Mar 15, 2012
VB.net application crashes without specific error
I developed one application in VB.Net 2010. It worked fine on my laptop. Now when I run this on another PC, it just crashes and give windows error as below.
[CODE]..........................
Along with this.
[CODE]......................
This application required .Net framework 4 & Oracle 9 ODBC drivers, which I installed on new PC.
I am not able to figure out what is the problem exactly, however it seems something with .Net framework itself.
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May 6, 2011
I was wondering if someone could translate this code into a more understandable code. It is suppose to be a function that accepts an item name its cost and its quantity. and adds one more array element to ."items" variable and assigns the given name and cost and quantity.
Public Sub AddItem(ByVal strName As String, ByVal dblCost As Double, ByVal intQuantity As Integer)
Me.items=DirectCast(Utils.CopyArray(DirectCast(Me.items,Array),New Purchase(me.itemsCount + 1)-1){}),Purchase())
End Sub
This is the translation i made but i don't think it is correct.
Public Sub AddItem(ByVal strName As String, ByVal dblPrice As Double, ByVal intQuan As Integer)
Dim items As Purchase() = Me.items
Dim itemCount As Integer = Me.itemsCount
For itemCount = 0 To items.Length - 1
[CODE]...
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Oct 9, 2011
Error is Simple Application -- Error Type (A first chance exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll)
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Feb 1, 2012
I seemed to have have ruined my settings on VS 2010... I can't get the Shapes to work just after I had fixed the problem with the PowerPacks, and then it deleted all of my shapes I had on my form after I was tweaking the code and added another shape. And ever since, the shapes make errors and I can't change there colors. I've tried reinstalling VS 2010, and changing refferences doesn't work anymore. The title is the problem I have with trying to add a shape through the code in my project, here is the code for that:
Public Class Form1
Public Circle As New Microsoft.VisualBasic.PowerPacks.OvalShape()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code]....
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Mar 7, 2012
I want to see the source code of Microsoft.Visualbasic.Financial.IRR how would i break it and how would i seee the sorce code of IRR method of financial class?System{" df -k | awk '{sum += $4 }i; END {print sum} '"};
above line is not useful I've tried to view it using different software but it will not work for me is there any software that will view it source code.
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Apr 4, 2010
I need a code that will create a new microsoft.visualbasic.powerpack LineShape on a picturebox like this
dim r as new rectangle = new rectangle(0,0,100,100)
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Jul 31, 2011
I am trying to get OpenSSL.net to 1) create a key pair to use for CA signing and 2) create and sign certificates using this CA. I have managed to create an RSA/SHA1 X509CertificateAuthority, and have created a X509Request and keys, but I am running into problems actually signing the request.
'create the request and request key
Dim rsa As OpenSSL.Crypto.RSA = New OpenSSL.Crypto.RSA()
rsa.GenerateKeys(1024, 65569, Nothing, Nothing)
[code]....
I am getting an OpenSslException on the line noted above, with the message error:0606B06E:digital envelope routines:EVP_SignFinal:wrong public key type error:0D0C3006:asn1 encoding routines:ASN1_item_sign:EVP lib
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Mar 6, 2012
I am trying to make a strong (or even medium-security) based authentication. How this would work is simply by storing a username/code on web (using dropbox perhaps) then using those codes to pass on to friends to use. This way if you remove that code online,that person will no longer be able to access that program. As far as I know, it is quite simple to save the number of uses, or username and pass on a text file to save on their file or registry things can be done but that is only 1 computer based. That is a very easily crackable security and is not worth it.As far as I have know you need to create a new main form where the code/ id/ username/password/onetimelogin will be asked. If it is correct, form2.show if not then "exit". The codes are stores on a text file on dropbox.com like websites, then the link to the textfile is obtained.
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Nov 9, 2009
i am getting the error "System.security.permissions.securitypermission" when running the VB application in another machine. i have put the .exe file in the common path and i ran it my machine and it is working fine, but when i tried to run it in the different machine i am getting the error. Can anyone help me out in fixing this error.
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Sep 2, 2009
I have a large project where we have 2-3 dll projects that are converted from VB6 to VB.NET. We have fixed all the issues that caused compilation errors, and most of obvious issues in running, so now we have basically a program up and running. The exe is created from scratch in VB.NET, using a lot of functionality from the converted dll's (including GUI forms). What I wonder is when I run the program in debug mode, I get a bunch of warnings in the "Immediate Window" saying:
A first chance exception of type 'System.Exception' occurred in Microsoft.VisualBasic.dll
...and some of other type (but most of them in Microsoft.VisualBasic.dll).I was wondering if this is common in projects converted from VB6, or if it is caused by bad design in our code...
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Mar 31, 2009
I have made an simple application (.exe). When i run this program local on my machine it works fine. When i run it from an server i get the system.security.securityexception message.
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Jan 13, 2012
I am trying trite code that will copy information from an infopath document to a word document that is being used as a template containing only a header and footer. The only reason for the code is becausthe footer (not optional) is too long to be handled by Infopath (which has a 255 character limit) and word can hold the full footer. Following the guidance on
Public Sub CTRL1_5_Clicked(ByVal sender As Object, ByVal e As ClickedEventArgs)
Dim appWord As Word.Application
Dim wrdDoc As Word.Document
[code].....
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Jul 8, 2010
I'm working with a vb.net 2005 project that i converted from vb 6.0 last year. It's working fine in windows xp, but on vista and windows 7 i get an error saying 'Insufficient security permissions to set the system time.' Can you think of any way to replicate this error on windows xp? I'm trying to get a windows 7 box setup at work but I was wondering if there was anything I could try with xp in the meantime.
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Oct 30, 2009
Exception: ASP .NET VB .NET Code connect to sql server using sql authentication sql onnection stringHere is the solution for the problem
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Nov 14, 2010
I am programming in visual basic 2008 I would like to set up serial numebers for software im developing. I would like to prevent software theft by ensuring that each purchased copy has a unique serial number that can only be used once. How would i create this so
a.) The serial numeber can only be used once
b.) The software cannot run without a correct serial number
c.) The serial number verification box pops up on ONLY the first use of the program and goes away after correct serial number is entered
d.) a serial number generation and verification program
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