(Classic ASP) Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate.

Note: This example requires Chilkat v9.5.0.87 or greater.

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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.Pdf")
set pdf = Server.CreateObject("Chilkat.Pdf")

' Load a PDF that has cryptographic signatures to be validated
success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
    Response.End
End If

' Each time we verify a signature, information about the signature is written into
' sigInfo (replacing whatever sigInfo previously contained).
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set sigInfo = Server.CreateObject("Chilkat.JsonObject")

' Iterate over each signature and validate each.
numSignatures = pdf.NumSignatures
validated = 0
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Cert")
set cert = Server.CreateObject("Chilkat.Cert")
i = 0
Do While i < numSignatures
    validated = pdf.VerifySignature(i,sigInfo)
    Response.Write "<pre>" & Server.HTMLEncode( "Signature " & i & " validated: " & validated) & "</pre>"

    ' The GetSignerCert method was added in Chilkat v9.5.0.87
    ' After calling VerifySignature, you can get the signer certificate by calling
    ' GetSignerCert with the same index. 
    success = pdf.GetSignerCert(i,cert)
    If (success <> 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( "PDF signer certificate: " & cert.SubjectDN) & "</pre>"
    End If

    i = i + 1
Loop

Response.Write "<pre>" & Server.HTMLEncode( "Finished.") & "</pre>"

%>
</body>
</html>