(VBScript) Get Certificates from .p12 / .pfx

A PKCS12 (.p12 / .pfx) is a container for holding a certificate, its private key, and the certs in the chain of authentication up to and possibly including the root CA cert. A .p12 is not required to contain certain things. It will contain whatever the creator of the .p12 decided to include. It's possible to contain just a private key, just a cert, many certs without private keys, or many certs with many private keys. Usually, a .p12 contains one certificate, its associated private key, and certificates in the chain of authentication.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Pfx")
set pfx = CreateObject("Chilkat.Pfx")

success = pfx.LoadPfxFile("qa_data/pfx/test.pfx","pfx_password")
If (success = 0) Then
    outFile.WriteLine(pfx.LastErrorText)
    WScript.Quit
End If

' Iterate over the certs contained in the PFX
numCerts = pfx.NumCerts
i = 0
Do While i < numCerts
    ' cert is a Chilkat.Cert
    Set cert = pfx.GetCert(i)

    outFile.WriteLine("--- " & i & " ---")
    outFile.WriteLine(cert.SubjectDN)
    ' Is this a root cert, or self-signed?
    outFile.WriteLine("Root: " & cert.IsRoot)
    outFile.WriteLine("Self-Signed: " & cert.SelfSigned)

    ' If this certificate is not the root (self-signed), then get the issuer.
    ' If the issuing certificate is contained in the PFX, then it will be found here..
    If (cert.SelfSigned <> 1) Then
        ' issuer is a Chilkat.Cert
        Set issuer = cert.FindIssuer()
        If (cert.LastMethodSuccess = 0) Then
            outFile.WriteLine("Issuer not found.")
        Else
            outFile.WriteLine("Issuer: " & issuer.SubjectDN)

        End If

    End If

    i = i + 1
Loop

' Usually, the user certificate is at index 0, its issuer is at index 1, etc. until we get to the root certificate.

outFile.Close