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(PowerShell) Create CMS Signed File (PDF) with Multiple Signing CertificatesDemonstrates 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.
Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll" # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. $crypt = New-Object Chilkat.Crypt2 # ------------ This example requires Chilkat v9.5.0.83 or greater. $cert1 = New-Object Chilkat.Cert $success = $cert1.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123") if ($success -ne $true) { $($cert1.LastErrorText) exit } $cert2 = New-Object Chilkat.Cert $success = $cert2.LoadPfxFile("qa_data/pfx/test_secret.pfx","secret") if ($success -ne $true) { $($cert2.LastErrorText) exit } # ------------ 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. $success = $crypt.AddSigningCert($cert1) if ($success -ne $true) { $($crypt.LastErrorText) exit } $success = $crypt.AddSigningCert($cert2) if ($success -ne $true) { $($crypt.LastErrorText) exit } # The CadesEnabled property applies to all methods that create PKCS7 signatures. # To create a CAdES-BES signature, set this property equal to true. $crypt.CadesEnabled = $true $crypt.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. $inFile = "qa_data/pdf/sample.pdf" $p7sFile = "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. $success = $crypt.CreateP7M($inFile,$p7sFile) if ($success -eq $false) { $($crypt.LastErrorText) exit } # Verify the .p7s file and extract the original file from the .p7s. $extractedToFilePath = "qa_output/sample.pdf" $success = $crypt.VerifyP7M($p7sFile,$extractedToFilePath) if ($success -eq $false) { $($crypt.LastErrorText) exit } $("Success!") |
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