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(PHP Extension) PDF Sign Under Existing SignatureSee more PDF Signatures ExamplesThis example explains how sign a previously-signed PDF and place the signature appearance below the existing 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. $success = $pdf->LoadFile('qa_data/pdf/sign_testing_4/hello_signed.pdf'); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } // The PDF we'll be signing already has a signature added in Adobe Acrobat DC. // It looks like this: // (Notice the Adobe background logo, which is commonly what you'll see when a signature // is created by Adobe Acrobat. Chilkat (obviously) does not create signatures using the Adobe // logo because it would be a copyright violation.) // 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); // To put our new signature underneath the existing signature, we have to specify the page // where the existing signature is found, and then we can specify "under" for the "appearance.y" $json->UpdateInt('page',1); $json->UpdateString('appearance.y','under'); $json->UpdateString('appearance.fontScale','10.0'); $json->UpdateString('appearance.text[0]','Reason: Agreement Accepted by John'); $json->UpdateString('appearance.text[1]','Date: current_dt'); // 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; } // Note: When adding an additional signature to a PDF, the existing signatures // are validated, and this includes validating the certificates previously used to // create the existing signatures. (A signature typically embeds the signing certs.) // In some cases, the certificates and/or certs in the chain of authentication for // existing signatures are not present, and are not available on the current system. // In this case, you can skip the validation by setting this keyword in UncommonOptions: $pdf->put_UncommonOptions('NO_VERIFY_CERT_SIGNATURES'); $success = $pdf->SignPdf($json,'qa_output/hello_signed.pdf'); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } print 'The PDF has been successfully cryptographically signed.' . "\n"; // Here's a screenshot of the 2nd signature positioned under the 1st in Adobe Acrobat: ?> |
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