автоматизирование настроек

Imports System.Security.Cryptography
Imports System.Text
Imports System.IO


  Private Function EncryptString(ByVal Value As String) As String
    Dim ct As ICryptoTransform
    Dim ms As MemoryStream
    Dim cs As CryptoStream
    Dim byt() As Byte


    Try
      ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV)


      byt = Encoding.UTF8.GetBytes(Value)


      ms = New MemoryStream
      cs = New CryptoStream(ms, ct, CryptoStreamMode.Write)
      cs.Write(byt, 0, byt.Length)
      cs.FlushFinalBlock()


      cs.Close()
    Catch
      MessageBox.Show( _
            "Schlьssel und IV mьssen zunдchst generiert werden!", _
            "Abbruch")
      Exit Function
    End Try
    Return Convert.ToBase64String(ms.ToArray())
  End Function


  Private Function DecryptString(ByVal Value As String) As String
    Dim ct As ICryptoTransform
    Dim ms As MemoryStream
    Dim cs As CryptoStream
    Dim byt() As Byte


    ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV)


    byt = Convert.FromBase64String(Value)


    ms = New MemoryStream
    cs = New CryptoStream(ms, ct, CryptoStreamMode.Write)
    cs.Write(byt, 0, byt.Length)
    cs.FlushFinalBlock()


    cs.Close()


    Return Encoding.UTF8.GetString(ms.ToArray())
  End Function


  Private Function SetEnc() As SymmetricAlgorithm
    If optDES.Checked Then
      Return New DESCryptoServiceProvider
    Else
      If optTripleDES.Checked Then
        Return New TripleDESCryptoServiceProvider
      End If
    End If
  End Function

mports System
Imports System.IO
Imports System.Security
Imports System.Security.Cryptography
Imports System.Runtime.InteropServices
Imports System.Text




Module Module1


   ' Call this function to remove the key from memory after it is used for security.
   <DllImport("kernel32.dll")> _
   Public Sub ZeroMemory(ByVal addr As IntPtr, ByVal size As Integer)
   End Sub


   ' Function to generate a 64-bit key.
   Function GenerateKey() As String
      ' Create an instance of a symmetric algorithm. The key and the IV are generated automatically.
      Dim desCrypto As DESCryptoServiceProvider = DESCryptoServiceProvider.Create()


      ' Use the automatically generated key for encryption. 
      Return ASCIIEncoding.ASCII.GetString(desCrypto.Key)


   End Function


   Sub EncryptFile(ByVal sInputFilename As String, _
                  ByVal sOutputFilename As String, _
                  ByVal sKey As String)


      Dim fsInput As New FileStream(sInputFilename, _
                                  FileMode.Open, FileAccess.Read)
      Dim fsEncrypted As New FileStream(sOutputFilename, _
                                  FileMode.Create, FileAccess.Write)


      Dim DES As New DESCryptoServiceProvider()


      'Set secret key for DES algorithm.
      'A 64-bit key and an IV are required for this provider.
      DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey)


      'Set the initialization vector.
      DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)


      'Create the DES encryptor from this instance.
      Dim desencrypt As ICryptoTransform = DES.CreateEncryptor()
      'Create the crypto stream that transforms the file stream by using DES encryption.
      Dim cryptostream As New CryptoStream(fsEncrypted, _
                                          desencrypt, _
                                          CryptoStreamMode.Write)


      'Read the file text to the byte array.
      Dim bytearrayinput(fsInput.Length - 1) As Byte
      fsInput.Read(bytearrayinput, 0, bytearrayinput.Length)
      'Write out the DES encrypted file.
      cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length)
      cryptostream.Close()
   End Sub


   Sub DecryptFile(ByVal sInputFilename As String, _
       ByVal sOutputFilename As String, _
       ByVal sKey As String)


      Dim DES As New DESCryptoServiceProvider()
      'A 64-bit key and an IV are required for this provider.
      'Set the secret key for the DES algorithm.
      DES.Key() = ASCIIEncoding.ASCII.GetBytes(sKey)
      'Set the initialization vector.
      DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)


      'Create the file stream to read the encrypted file back.
      Dim fsread As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read)
      'Create the DES decryptor from the DES instance.
      Dim desdecrypt As ICryptoTransform = DES.CreateDecryptor()
      'Create the crypto stream set to read and to do a DES decryption transform on incoming bytes.
      Dim cryptostreamDecr As New CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read)
      'Print out the contents of the decrypted file.
      Dim fsDecrypted As New StreamWriter(sOutputFilename)
      fsDecrypted.Write(New StreamReader(cryptostreamDecr).ReadToEnd)
      fsDecrypted.Flush()
      fsDecrypted.Close()
   End Sub


   Public Sub Main()
      'Must be 64 bits, 8 bytes.
      Dim sSecretKey As String


      ' Get the key for the file to encrypt.
      ' You can distribute this key to the user who will decrypt the file.
      sSecretKey = GenerateKey()


      ' For additional security, pin the key.
      Dim gch As GCHandle = GCHandle.Alloc(sSecretKey, GCHandleType.Pinned)




      ' Encrypt the file.        
      EncryptFile("%USERPROFILE%\MyData.txt", _
                      "%USERPROFILE%\Encrypted.txt", _
                      sSecretKey)


      ' Decrypt the file.
      DecryptFile("%USERPROFILE%\Encrypted.txt", _
                  "%USERPROFILE%\Decrypted.txt", _
                  sSecretKey)


      ' Remove the key from memory. 
      ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2)
      gch.Free()
   End Sub


End Module