[Help] Obsolete Code

Code:

---

    ' Use the password to generate key bytes.
    Private Sub MakeKeyAndIV(ByVal password As String, ByVal key_size_bits As Integer, ByVal block_size_bits As Integer, ByRef key As Byte(), ByRef iv As Byte())
        Dim password_derive_bytes As New PasswordDeriveBytes( _
            password, Nothing, "SHA384", 1000)

        key = password_derive_bytes.GetBytes(key_size_bits \ 8)
        iv = password_derive_bytes.GetBytes(block_size_bits \ 8)
    End Sub

Warning        1        'Public Overrides Function GetBytes(cb As Integer) As Byte()' is obsolete: 'Rfc2898DeriveBytes replaces PasswordDeriveBytes for deriving key material from a password and is preferred in new applications.'.

---

I have found the above code on generating passwords but when I converted the whole project it displays 2 warnings that the code was obsolete but when I search google I didnt found any fix for that warning.

You don't need to search Google. The warning message itself tells you what to do:

Quote:

---

Rfc2898DeriveBytes replaces PasswordDeriveBytes for deriving key material from a password and is preferred in new applications.

---

You should be using the Rfc2898DeriveBytes class rather than the PasswordDeriveBytes class. The documentation can show you the usage but, while I've neevr used either myself, I think the two are used in basically the same way and it's just that the new class has an internal implementation that satisfies the latest standards.

I am getting an error if I change PasswordDeriveByres to Rfc2898DeriveBytes...

vb Code:

Dim password_derive_bytes As New Rfc2898DeriveBytes(password, Nothing, "SHA384", 1000)
        key = password_derive_bytes.GetBytes(key_size_bits \ 8)
        iv = password_derive_bytes.GetBytes(block_size_bits \ 8)

no accessible 'New' accepts this number of arguments...

So have a look at the MSDN documentation for the Rfc2898DeriveBytes class and see what parameters its constructors do have. You should also be reading the documentation to see how it works. Like I said, I've never actually used it so, while I can say that they are similar from what little I've seen, I can't say whether they are the same.