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Create CMS Signed File (PDF) with Multiple Signing Certificates

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Demonstrates how to sign a file by adding multiple signatures (multiple certificates). This example signs a PDF file to produce an output file that is a CMS signature wrapping the original PDF. (Note: This is different than modifying a PDF by injecting a signature into the PDF file format.)

Note: This example requires Chilkat v9.5.0.83 or greater.

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Local $bSuccess = False

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

$oCrypt = ObjCreate("Chilkat.Crypt2")

; ------------ This example requires Chilkat v9.5.0.83 or greater.

$oCert1 = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert1.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
If ($bSuccess <> True) Then
    ConsoleWrite($oCert1.LastErrorText & @CRLF)
    Exit
EndIf

$oCert2 = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert2.LoadPfxFile("qa_data/pfx/test_secret.pfx","secret")
If ($bSuccess <> True) Then
    ConsoleWrite($oCert2.LastErrorText & @CRLF)
    Exit
EndIf

; ------------ This example requires Chilkat v9.5.0.83 or greater.

; Tell the crypt component to use both certificates for signing. 
; When we create the signature, it will be signed by both certificates.
$bSuccess = $oCrypt.AddSigningCert($oCert1)
If ($bSuccess <> True) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oCrypt.AddSigningCert($oCert2)
If ($bSuccess <> True) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

; The CadesEnabled property applies to all methods that create PKCS7 signatures. 
; To create a CAdES-BES signature, set this property equal to true. 
$oCrypt.CadesEnabled = True

$oCrypt.HashAlgorithm = "sha256"

; We can sign any type of file, creating a .p7s as output.
; The .p7s contains the signature and also embeds the data of the file that is signed.
Local $sInFile = "qa_data/pdf/sample.pdf"
Local $sP7sFile = "qa_output/sample.pdf.p7s"

; Create the CAdES-BES attached signature, which contains the original data.
; Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
; is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
; is NOT contained within the signature.  We want the data to be contained in the signature, therefore
; we call CreateP7M even though we are naming our output file .p7s.
$bSuccess = $oCrypt.CreateP7M($sInFile,$sP7sFile)
If ($bSuccess = False) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

; Verify the .p7s file and extract the original file from the .p7s. 
Local $sExtractedToFilePath = "qa_output/sample.pdf"
$bSuccess = $oCrypt.VerifyP7M($sP7sFile,$sExtractedToFilePath)
If ($bSuccess = False) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Success!" & @CRLF)