VB.NET

Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML. VB.NET

Dim success As Boolean = False

Dim asn As New Chilkat.Asn

' Begin with loading ASN.1 from a binary DER/BER format file.
success = asn.LoadBinaryFile("/Users/chilkat/testData/p7b/test.p7b")
If (success <> True) Then
    Debug.WriteLine(asn.LastErrorText)
    Exit Sub
End If


' Convert ASN.1 to XML:
Dim strXml As String = asn.AsnToXml()
If (asn.LastMethodSuccess <> True) Then
    Debug.WriteLine(asn.LastErrorText)
    Exit Sub
End If


' The XML returned by AsnToXml will be compact and not pretty-formatted.
' Use Chilkat XML to format the XML better:
Dim xml As New Chilkat.Xml
success = xml.LoadXml(strXml)
' Assuming success for this example..
' This is formatted better for human viewing:
Debug.WriteLine(xml.GetXml())

' Now get the ASN.1 in base64 format.  Any encoding supported
' by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
Dim strBase64 As String = asn.GetEncodedDer("base64")

' Load the ASN.1 from XML:
Dim asn2 As New Chilkat.Asn
success = asn2.LoadAsnXml(xml.GetXml())
If (success <> True) Then
    Debug.WriteLine(asn2.LastErrorText)
    Exit Sub
End If


' Load the ASN.1 from an encoded string, such as base64:
Dim asn3 As New Chilkat.Asn
success = asn3.LoadEncoded(strBase64,"base64")
If (success <> True) Then
    Debug.WriteLine(asn3.LastErrorText)
    Exit Sub
End If