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(Perl) 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.
use chilkat(); # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. $crypt = chilkat::CkCrypt2->new(); # ------------ This example requires Chilkat v9.5.0.83 or greater. $cert1 = chilkat::CkCert->new(); $success = $cert1->LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123"); if ($success != 1) { print $cert1->lastErrorText() . "\r\n"; exit; } $cert2 = chilkat::CkCert->new(); $success = $cert2->LoadPfxFile("qa_data/pfx/test_secret.pfx","secret"); if ($success != 1) { print $cert2->lastErrorText() . "\r\n"; 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 != 1) { print $crypt->lastErrorText() . "\r\n"; exit; } $success = $crypt->AddSigningCert($cert2); if ($success != 1) { print $crypt->lastErrorText() . "\r\n"; 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->put_CadesEnabled(1); $crypt->put_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 == 0) { print $crypt->lastErrorText() . "\r\n"; 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 == 0) { print $crypt->lastErrorText() . "\r\n"; exit; } print "Success!" . "\r\n"; |
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