Help with decrypting file using

Posted on 2014-10-24
Last Modified: 2014-10-25

How do I modify the code to only decrypt \Data\LinkFiles\LinkFinal.xml instead of all xml files in the folder?

For Each File In Directory.GetFiles(Application.StartupPath & "\Data\LinkFiles")

                fslinkBEL = New System.IO.FileStream(File, IO.FileMode.Open)
                dtsetlinkBEL = New DataSet
                Dim sec As New Security
                For t As Integer = 0 To dtsetlinkBEL.Tables.Count - 1
                    For i As Integer = 0 To dtsetlinkBEL.Tables(t).Rows.Count - 1
                        For j As Integer = 0 To dtsetlinkBEL.Tables(t).Columns.Count - 1
                            If Not IsDBNull(dtsetlinkBEL.Tables(t).Rows(i).Item(j)) Then
                                'dtsetlinkBEL.Tables(t).Rows(i).Item(j) = sec.psEncrypt(dtsetlinkBEL.Tables(t).Rows(i).Item(j))
                                dtsetlinkBEL.Tables(t).Rows(i).Item(j) = sec.psDecrypt(dtsetlinkBEL.Tables(t).Rows(i).Item(j))
                            End If
                MsgBox(Err.Description & "FileName  " & File)
            End Try
        MsgBox("All Files Decrypted")

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Question by:vcharles
  • 2
  • 2
LVL 35

Accepted Solution

Miguel Oz earned 500 total points
ID: 40403566
You can remove the loop code (lines 1,2 and 23) and insert this line at line 1:
Dim File As String = Application.StartupPath & "Data\LinkFiles\LinkFinal.xml"

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The try/catch block code remains the same. I just initialize File variable with your requested value.

Author Comment

ID: 40403881

Thanks for the code, how do you check to see if the file is encrypted before you attempt to decrypt it?

LVL 35

Expert Comment

by:Miguel Oz
ID: 40404277
Regarding post question, the short answer is : NO.
If a code can determine this, it could mean that the encryption algorithm was broken. The goal of the encryption is to produce a file that looks like a random chunk of data.
Having said that you could add an extra node element to your xml, this element should store a value that your program reads and determine whether the file contains encrypted/decrypted info.

Author Comment

ID: 40404342

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