Classic ASP

Verify XAdES with External File Reference

See more XML Digital Signatures Examples

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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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.

' Load the XAdES file to be validated..
set sbXml = Server.CreateObject("Chilkat.StringBuilder")
success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES","utf-8")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load XAdES input file.") & "</pre>"
    Response.End
End If

set validator = Server.CreateObject("Chilkat.XmlDSig")

' Specify a set of absolute or relative directory paths to be searched for any external file references.
' Directory paths are separated by semicolon chars.
validator.ExternalRefDirs = "qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir"

success = validator.LoadSignatureSb(sbXml)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( validator.LastErrorText) & "</pre>"
    Response.End
End If

' Validate signatures as usual..
i = 0
Do While i < validator.NumSignatures
    validator.Selector = i

    valid = validator.VerifySignature(1)
    Response.Write "<pre>" & Server.HTMLEncode( "Signature " & i + 1 & " and all reference digests OK = " & valid) & "</pre>"

    i = i + 1
Loop

%>
</body>
</html>