(PowerBuilder) Examine KeyInfo Certificate in XML Signature

This example loads signed XML and gets the signing certificate, assuming the certificate is contained in X509Certificate within the KeyInfo.

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integer li_rc
oleobject loo_Dsig
oleobject loo_SbXml
integer li_Success
oleobject loo_XmlKeyInfo
string ls_CertBase64
oleobject loo_Cert

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

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

li_Success = loo_SbXml.LoadFile("c:/aaworkarea/elias/3/face_f09006808443a699d1b.xml","utf-8")
if li_Success <> 1 then
    Write-Debug "Failed to load XML file."
    destroy loo_Dsig
    destroy loo_SbXml
    return
end if

li_Success = loo_Dsig.LoadSignatureSb(loo_SbXml)
if li_Success <> 1 then
    Write-Debug loo_Dsig.LastErrorText
    destroy loo_Dsig
    destroy loo_SbXml
    return
end if

// Get the KeyInfo XML.
loo_XmlKeyInfo = loo_Dsig.GetKeyInfo()
if loo_Dsig.LastMethodSuccess <> 1 then
    Write-Debug loo_Dsig.LastErrorText
    destroy loo_Dsig
    destroy loo_SbXml
    return
end if

Write-Debug loo_XmlKeyInfo.GetXml()
Write-Debug "----"

// Assuming the X509Certificate is in the KeyInfo, it will look like this:

//   <ds:KeyInfo Id="...">
//     <ds:KeyValue>
//     ...  
//     <ds:X509Data>
//       <ds:X509Certificate>MIIHAz...</ds:X509Certificate>
//     </ds:X509Data>
//   </ds:KeyInfo>
ls_CertBase64 = loo_XmlKeyInfo.GetChildContent("*:X509Data|*:X509Certificate")
if loo_XmlKeyInfo.LastMethodSuccess <> 1 then
    Write-Debug "No X509Certificate found in the KeyInfo."
    destroy loo_Dsig
    destroy loo_SbXml
    return
end if

// Load a certificate object w/ the base64.
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.LoadFromBase64(ls_CertBase64)
if li_Success <> 1 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Dsig
    destroy loo_SbXml
    destroy loo_Cert
    return
end if

// Examine the cert..
Write-Debug "SubjectDN: " + loo_Cert.SubjectDN
Write-Debug "IssuerDN: " + loo_Cert.IssuerDN
Write-Debug "SerialNumber as Decimal: " + loo_Cert.SerialDecimal

destroy loo_XmlKeyInfo


destroy loo_Dsig
destroy loo_SbXml
destroy loo_Cert