(VBScript) Export Digital Certificate's Public Key

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML.

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.Cert")
set cert = CreateObject("Chilkat.Cert")

' LoadFromFile will load virtually any certificate format file.
' It will auto-recognize the format and load appropiately.
success = cert.LoadFromFile("/Users/chilkat/testData/cer/chilkat.cer")
If (success <> 1) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

' Get the public key:

' pubkey is a Chilkat.PublicKey
Set pubkey = cert.ExportPublicKey()
If (cert.LastMethodSuccess = 0) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

' Save to various formats:
success = pubkey.SaveDerFile(0,"/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der")
If (success <> 1) Then
    outFile.WriteLine(pubkey.LastErrorText)

    WScript.Quit
End If

success = pubkey.SavePemFile(0,"/Users/chilkat/testData/pubkeys/chilkat.pem")
If (success <> 1) Then
    outFile.WriteLine(pubkey.LastErrorText)

    WScript.Quit
End If

success = pubkey.SaveDerFile(1,"/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der")
If (success <> 1) Then
    outFile.WriteLine(pubkey.LastErrorText)

    WScript.Quit
End If

success = pubkey.SaveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml")
If (success <> 1) Then
    outFile.WriteLine(pubkey.LastErrorText)

    WScript.Quit
End If

outFile.WriteLine("Public key exported to all file formats.")

outFile.Close