(PowerBuilder) 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

integer li_rc
oleobject loo_PrivKey
string ls_Password
integer li_Success
oleobject loo_Xml
string ls_Modulus
oleobject loo_BinDat
string ls_HexModulus
oleobject loo_Cert
oleobject loo_PubKey

loo_PrivKey = create oleobject
// Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat.PrivateKey")
if li_rc < 0 then
    destroy loo_PrivKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if

ls_Password = "12345678a"
li_Success = loo_PrivKey.LoadPkcs8EncryptedFile("qa_data/certs/test_12345678a.key",ls_Password)
if li_Success <> 1 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_PrivKey
    return
end if

loo_Xml = create oleobject
// Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
li_rc = loo_Xml.ConnectToNewObject("Chilkat.Xml")

loo_Xml.LoadXml(loo_PrivKey.GetXml())

// The XML contains the parts of the key in base64.
Write-Debug "Private Key XML:"
Write-Debug loo_Xml.GetXml()

// We can get the base64 modulus like this:
ls_Modulus = loo_Xml.GetChildContent("Modulus")
Write-Debug "base64 modulus = " + ls_Modulus

// To convert to hex:
loo_BinDat = create oleobject
// Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
li_rc = loo_BinDat.ConnectToNewObject("Chilkat.BinData")

loo_BinDat.AppendEncoded(ls_Modulus,"base64")
ls_HexModulus = loo_BinDat.GetEncoded("hex")
Write-Debug "hex modulus = " + ls_HexModulus

// Now get the modulus from the cert:
loo_Cert = create oleobject
// Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

li_Success = loo_Cert.LoadFromFile("qa_data/certs/test_12345678a.cer")
if li_Success <> 1 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_PrivKey
    destroy loo_Xml
    destroy loo_BinDat
    destroy loo_Cert
    return
end if

// The cert contains the public key, which is composed of the
// modulus + exponent (for RSA keys).
loo_PubKey = loo_Cert.ExportPublicKey()

loo_Xml.LoadXml(loo_PubKey.GetXml())
Write-Debug "Public Key XML:"
Write-Debug loo_Xml.GetXml()

// Proceed in the same way as before....
ls_Modulus = loo_Xml.GetChildContent("Modulus")
Write-Debug "base64 modulus = " + ls_Modulus

// To convert to hex:
loo_BinDat.Clear()
loo_BinDat.AppendEncoded(ls_Modulus,"base64")
ls_HexModulus = loo_BinDat.GetEncoded("hex")
Write-Debug "hex modulus = " + ls_HexModulus

destroy loo_PubKey


destroy loo_PrivKey
destroy loo_Xml
destroy loo_BinDat
destroy loo_Cert