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(PHP Extension) Sign PDF with Invisible SignatureSee more PDF Signatures ExamplesDemonstrates how to sign a PDF with an invisible signature. Note: This example requires Chilkat v9.5.0.85 or greater.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $pdf = new CkPdf(); // Load a PDF to be signed. // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf $success = $pdf->LoadFile('qa_data/pdf/hello.pdf'); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } // Options for signing are specified in JSON. $json = new CkJsonObject(); // In most cases, the signingCertificateV2 and signingTime attributes are required. $json->UpdateInt('signingCertificateV2',1); $json->UpdateInt('signingTime',1); // Indicate that the signature will be invisible. $json->UpdateBool('invisibleSignature',true); // Load the signing certificate. (Use your own certificate.) $cert = new CkCert(); $success = $cert->LoadPfxFile('qa_data/pfx/myPdfSigningCert.pfx','secret'); if ($success == false) { print $cert->lastErrorText() . "\n"; exit; } // Tell the pdf object to use the certificate for signing. $success = $pdf->SetSigningCert($cert); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } $success = $pdf->SignPdf($json,'qa_output/hello_signed.pdf'); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } print 'PDF successfully signed with an invisible signature.' . "\n"; // An invisible signature has no appearance within the PDF document itself, // but Adobe Acrobat will indicate the document is signed in a toolbar, as shown here: ?> |
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