PowerBuilder

Get RSA Key Modulus from .cer or .key

See more Certificates Examples

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 

or

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

PowerBuilder

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

li_Success = 0

loo_PrivKey = create oleobject
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 = 0 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_PrivKey
    return
end if

loo_Xml = create oleobject
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
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
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

li_Success = loo_Cert.LoadFromFile("qa_data/certs/test_12345678a.cer")
if li_Success = 0 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 = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")

loo_Cert.GetPublicKey(loo_PubKey)

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_PrivKey
destroy loo_Xml
destroy loo_BinDat
destroy loo_Cert
destroy loo_PubKey