Improve company productivity with a Business Account.Sign Up

x
?
Solved

wrapping gpg in vb.net to decrypt files

Posted on 2009-05-18
4
Medium Priority
?
1,369 Views
Last Modified: 2012-05-07
I am receiving files encrypted using gpg. I have set Gnupg for Windows to work with a passphrase. How can I use vb.net 2008 to decrypt a whole folder of files? Anyone have a sample? Thanks.
0
Comment
Question by:jwagman
  • 3
4 Comments
 
LVL 9

Expert Comment

by:cdaly33
ID: 24416517
I use this in several apps every day.  I run it as a process inside vb.net.  For your scenario just loop through each file and run my code below.
      '*** decrypt - start
      Dim executestring As String = String.Format("""{0}"" --decrypt-files ""{1}""", gpgpath, tempsourcepath)
      Dim psi As New  _
        System.Diagnostics.ProcessStartInfo(executestring)
      psi.RedirectStandardOutput = True
      psi.WindowStyle = ProcessWindowStyle.Hidden
      psi.UseShellExecute = False
 
      Dim decrypt As System.Diagnostics.Process
      decrypt = System.Diagnostics.Process.Start(psi)
      Dim myOutput As System.IO.StreamReader = decrypt.StandardOutput
      decrypt.WaitForExit(20000)
      If decrypt.HasExited Then
        Dim output As String = myOutput.ReadToEnd
        Debug.WriteLine(output)
      End If
      '*** decrypt - end

Open in new window

0
 
LVL 9

Expert Comment

by:cdaly33
ID: 24416527
Alternatively here is a .net wrapper for gpg.
http://aspalliance.com/748
0
 

Author Comment

by:jwagman
ID: 24416547
Don't I need to include the passphrase as one of the args to process?
0
 
LVL 9

Accepted Solution

by:
cdaly33 earned 1500 total points
ID: 24416611
Yes, the gpg documentation has the parameter for passing the passphrase.  I'm not sure off the top of head what arg name it uses.

For you:
      Dim executestring As String = String.Format("""{0}"" --decrypt-files ""{1}""", gpgpath, tempsourcepath)

Becomes:
      Dim executestring As String = String.Format("""{0}"" --decrypt-files ""{1}"" --argnameforpassphrase passphrase", gpgpath, tempsourcepath)

0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

In real business world data are crucial and sometimes data are shared among different information systems. Hence, an agreeable file transfer protocol need to be established.
The well known Cerber ransomware continues to spread this summer through spear phishing email campaigns targeting enterprises. Learn how it easily bypasses traditional defenses - and what you can do to protect your data.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

585 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question