(VB.NET UWP/WinRT) Get Text Certificate Extensions by OID

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Demonstrates how to get text certificate extensions by OID. In this example, we have a certificate with the following OID extensions: 1.3.6.1.4.1.49952.5.8.5, 1.3.6.1.4.1.49952.5.8.6, 1.3.6.1.4.1.49952.5.8.7.

Most certificate extensions have values that are ASN.1 (binary). For the majority of cases, an application should call GetExtensionAsXml. For extensions known to have text values (such as the OIDs listed above), an application can instead call GetExtensionAsText.

The GetExtensionAsText method is added in Chilkat v9.5.0.89.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

Dim cert As New Chilkat.Cert

Dim success As Boolean = cert.LoadFromFile("qa_data/certs/PUH9.cer")
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim oid As String = "1.3.6.1.4.1.49952.5.8.5"
Dim str As String = cert.GetExtensionAsText(oid)
If (cert.LastMethodSuccess = True) Then
    Debug.WriteLine(oid & ": " & str)
End If


oid = "1.3.6.1.4.1.49952.5.8.6"
str = cert.GetExtensionAsText(oid)
If (cert.LastMethodSuccess = True) Then
    Debug.WriteLine(oid & ": " & str)
End If


oid = "1.3.6.1.4.1.49952.5.8.7"
str = cert.GetExtensionAsText(oid)
If (cert.LastMethodSuccess = True) Then
    Debug.WriteLine(oid & ": " & str)
End If