Classic ASP

Examine KeyInfo Certificate in XML Signature

See more XML Digital Signatures Examples

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

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

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

set dsig = Server.CreateObject("Chilkat.XmlDSig")
set sbXml = Server.CreateObject("Chilkat.StringBuilder")

success = sbXml.LoadFile("c:/aaworkarea/elias/3/face_f09006808443a699d1b.xml","utf-8")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load XML file.") & "</pre>"
    Response.End
End If

success = dsig.LoadSignatureSb(sbXml)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( dsig.LastErrorText) & "</pre>"
    Response.End
End If

' Get the KeyInfo XML.
' xmlKeyInfo is a Chilkat.Xml
Set xmlKeyInfo = dsig.GetKeyInfo()
If (dsig.LastMethodSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( dsig.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( xmlKeyInfo.GetXml()) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "----") & "</pre>"

' 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>
certBase64 = xmlKeyInfo.GetChildContent("*:X509Data|*:X509Certificate")
If (xmlKeyInfo.LastMethodSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "No X509Certificate found in the KeyInfo.") & "</pre>"
    Response.End
End If

' Load a certificate object w/ the base64.
set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadFromBase64(certBase64)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

' Examine the cert..
Response.Write "<pre>" & Server.HTMLEncode( "SubjectDN: " & cert.SubjectDN) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "IssuerDN: " & cert.IssuerDN) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "SerialNumber as Decimal: " & cert.SerialDecimal) & "</pre>"


%>
</body>
</html>