B4X

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.

B4X

Dim success As Boolean = False

Dim cert As ChilkatCert
cert.Initialize("cert")

success = cert.LoadFromFile("qa_data/certs/PUH9.cer")
If success = False Then
    Log(cert.LastErrorText)
    Return
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
    Log(oid & ": " & str)
End If


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


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