PowerBuilder

CoSign PKCS7/CMS Signed Data

See more Digital Signatures Examples

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.

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Crypt
oleobject loo_Cert
oleobject loo_Bd
oleobject loo_Bd2

li_Success = 0

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

loo_Crypt = create oleobject
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")
if li_rc < 0 then
    destroy loo_Crypt
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Cert = create oleobject
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

// If loading from a smart card, set the smartcard PIN.
loo_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..
li_Success = loo_Cert.LoadFromSmartcard("")
if li_Success = 0 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert
    return
end if

li_Success = loo_Crypt.SetSigningCert(loo_Cert)
if li_Success = 0 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert
    return
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.)
loo_Bd = create oleobject
li_rc = loo_Bd.ConnectToNewObject("Chilkat.BinData")

li_Success = loo_Bd.LoadFile("qa_data/p7s/cosign/sample.pdf.p7s")
if li_Success = 0 then
    Write-Debug "Failed to load pdf.p7s input file."
    destroy loo_Crypt
    destroy loo_Cert
    destroy loo_Bd
    return
end if

// bd2 will contain the co-signed result.
loo_Bd2 = create oleobject
li_rc = loo_Bd2.ConnectToNewObject("Chilkat.BinData")

li_Success = loo_Crypt.CoSign(loo_Bd,loo_Cert,loo_Bd2)
if li_Success = 0 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Crypt
    destroy loo_Cert
    destroy loo_Bd
    destroy loo_Bd2
    return
end if

li_Success = loo_Bd.WriteFile("qa_output/cosigned.pdf.p7s")
if li_Success = 0 then
    Write-Debug "Failed to save pdf.p7s output file."
    destroy loo_Crypt
    destroy loo_Cert
    destroy loo_Bd
    destroy loo_Bd2
    return
end if

Write-Debug "Success!"


destroy loo_Crypt
destroy loo_Cert
destroy loo_Bd
destroy loo_Bd2