Classic ASP

CoSign PKCS7/CMS Signed Data

Demonstrates how to add a 2nd signature to a CMS SignedData. This is to add an additional signature, SignerInfo and certificate(s) to an existing CMS signed data.

In this example, we cosign an existing pdf.p7s

Note: The CoSign method is added in Chilkat v9.5.0.89.

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

set crypt = Server.CreateObject("Chilkat.Crypt2")
set cert = Server.CreateObject("Chilkat.Cert")

' If loading from a smart card, set the smartcard PIN.
cert.SmartCardPin = "0000"

' Load a certificate in some way, such as from a smart card.
' Chilkat provides other methods to load from a .pfx, .pem, or from the Windows certificate stores..
success = cert.LoadFromSmartcard("")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

success = crypt.SetSigningCert(cert)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
    Response.End
End If

' Load the file to be co-signed.
' NOTE:  This is to cosign a PDF file contained within a CMS (PKCS7) message.
' (In other words, the PDF is contained within the CMS SignedData, rather than the other way around
' where a CMS signature is contained within a PDF.  Use Chilkat's PDF class to sign a PDF, which is
' to embed a CMS signature within the PDF.)
set bd = Server.CreateObject("Chilkat.BinData")
success = bd.LoadFile("qa_data/p7s/cosign/sample.pdf.p7s")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load pdf.p7s input file.") & "</pre>"
    Response.End
End If

' bd2 will contain the co-signed result.
set bd2 = Server.CreateObject("Chilkat.BinData")
success = crypt.CoSign(bd,cert,bd2)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
    Response.End
End If

success = bd.WriteFile("qa_output/cosigned.pdf.p7s")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to save pdf.p7s output file.") & "</pre>"
    Response.End
End If

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

%>
</body>
</html>