(Classic ASP) Verify XML Digital Signature

Verifies XML signatures in an XML file.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbXml = Server.CreateObject("Chilkat.StringBuilder")
success = sbXml.LoadFile("qa_data/xml_dsig_verify/csioz_sample.xml","utf-8")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load XML file.") & "</pre>"
    Response.End
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.XmlDSig")
set dsig = Server.CreateObject("Chilkat.XmlDSig")

' First load the XML containing the signatures to be verified.
success = dsig.LoadSignatureSb(sbXml)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( dsig.LastErrorText) & "</pre>"
    Response.End
End If

' It's possible that an XML document can contain multiple signatures.
' Each can be verified as follows:
i = 0
Do While i < dsig.NumSignatures
    ' Select the Nth signature by setting the Selector property.
    dsig.Selector = i

    ' The bVerifyReferenceDigests argument determines if we want
    ' to also verify each reference digest.  If set to 0,
    ' then only the SignedInfo part of the Signature is verified.
    bVerifyReferenceDigests = 1
    bVerified = dsig.VerifySignature(bVerifyReferenceDigests)
    Response.Write "<pre>" & Server.HTMLEncode( "Signature " & i + 1 & " verified = " & bVerified) & "</pre>"

    i = i + 1
Loop

%>
</body>
</html>