VB.NET

Get Text Certificate Extensions by OID

See more Certificates Examples

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.

VB.NET

Dim success As Boolean = False

Dim cert As New Chilkat.Cert

success = 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