(VBScript) Get RSA Key Modulus from .cer or .key

Demonstrates how to get the RSA key modulus from either the certificate (.cer) or RSA key (.key). OpenSSL commands to do the same would be:

openssl x509 -inform DER -in "test.cer"  -modulus -noout 

openssl pkcs8 -inform DER -in​ "test.key"​ -outform PEM -passin pass:"12345​678a​"
   | openssl rsa -inform PEM -modulus -noout 

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.PrivateKey")
set privKey = CreateObject("Chilkat.PrivateKey")

password = "12345678a"
success = privKey.LoadPkcs8EncryptedFile("qa_data/certs/test_12345678a.key",password)
If (success <> 1) Then
    outFile.WriteLine(privKey.LastErrorText)
    WScript.Quit
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Xml")
set xml = CreateObject("Chilkat.Xml")
success = xml.LoadXml(privKey.GetXml())

' The XML contains the parts of the key in base64.
outFile.WriteLine("Private Key XML:")
outFile.WriteLine(xml.GetXml())

' We can get the base64 modulus like this:
modulus = xml.GetChildContent("Modulus")
outFile.WriteLine("base64 modulus = " & modulus)

' To convert to hex:
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
set binDat = CreateObject("Chilkat.BinData")
success = binDat.AppendEncoded(modulus,"base64")
hexModulus = binDat.GetEncoded("hex")
outFile.WriteLine("hex modulus = " & hexModulus)

' Now get the modulus from the cert:
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Cert")
set cert = CreateObject("Chilkat.Cert")

success = cert.LoadFromFile("qa_data/certs/test_12345678a.cer")
If (success <> 1) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

' The cert contains the public key, which is composed of the
' modulus + exponent (for RSA keys).
' pubKey is a Chilkat.PublicKey
Set pubKey = cert.ExportPublicKey()

success = xml.LoadXml(pubKey.GetXml())
outFile.WriteLine("Public Key XML:")
outFile.WriteLine(xml.GetXml())

' Proceed in the same way as before....
modulus = xml.GetChildContent("Modulus")
outFile.WriteLine("base64 modulus = " & modulus)

' To convert to hex:
success = binDat.Clear()
success = binDat.AppendEncoded(modulus,"base64")
hexModulus = binDat.GetEncoded("hex")
outFile.WriteLine("hex modulus = " & hexModulus)


outFile.Close