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<?php
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/**
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* E081_signature_pades_lta.php
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*
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* @since 2026-07-15
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* @category Library
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* @package Pdf
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* @author Nicola Asuni <info@tecnick.com>
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* @copyright 2002-2026 Nicola Asuni - Tecnick.com LTD
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* @license https://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE)
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* @link https://github.com/tecnickcom/tc-lib-pdf
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*
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* This file is part of tc-lib-pdf software library.
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*/
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// NOTE: local file reads (images, fonts, attachments) are restricted to an allowlist of
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// trusted paths that covers this package tree, so run the examples in place. To read assets
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// from other locations, list them in the 'allowedPaths' entry of the fileOptions constructor
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// parameter (see E047_remote_resources_security.php).
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// NOTE: run make fonts in the project root to generate the dependencies and example fonts.
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// autoloader when using Composer
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require __DIR__ . '/../vendor/autoload.php';
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// define fonts directory
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\define('K_PATH_FONTS', \realpath(__DIR__ . '/../vendor/tecnickcom/tc-lib-pdf-font/target/fonts'));
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// main TCPDF object
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$pdf = new \Com\Tecnick\Pdf\Tcpdf();
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$pdf->setCreator('tc-lib-pdf');
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$pdf->setAuthor('Nicola Asuni');
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$pdf->setSubject('tc-lib-pdf example: 081');
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$pdf->setTitle('PAdES B-LTA Archive Timestamp Signature Example');
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$pdf->setKeywords('TCPDF tc-lib-pdf example signature pades pades-b-lta archive timestamp doctimestamp dss');
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$pdf->setPDFFilename('081_signature_pades_lta.pdf');
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// Insert font before adding the first page.
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$bfont = $pdf->font->insert($pdf->pon, 'helvetica', '', 11);
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$page = $pdf->addPage();
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$pdf->page->addContent($bfont['out']);
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$text = 'This document is a PAdES-BASELINE-LTA signature: B-LT plus a document archive timestamp.';
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$textCell = $pdf->getTextCell(
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txt: $text,
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posx: 15,
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posy: 20,
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width: 180,
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height: 0,
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offset: 0,
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linespace: 1,
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valign: \Com\Tecnick\Pdf\TextVAlign::Top,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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);
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$pdf->page->addContent($textCell);
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$text2 =
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'The archive timestamp is a /Type /DocTimeStamp field (/SubFilter /ETSI.RFC3161) covering the '
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. 'whole document, added in a further incremental revision to protect the signature over the long term.';
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$textCell2 = $pdf->getTextCell(
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txt: $text2,
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posx: 15,
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posy: 27,
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width: 180,
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height: 0,
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offset: 0,
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linespace: 1,
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valign: \Com\Tecnick\Pdf\TextVAlign::Top,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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);
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$pdf->page->addContent($textCell2);
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$certPath = \realpath(__DIR__ . '/data/cert/tcpdf.crt');
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if ($certPath === false) {
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throw new \RuntimeException('Missing signing certificate: examples/data/cert/tcpdf.crt');
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}
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$cert = 'file://' . $certPath;
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// PAdES-BASELINE-LTA is produced by configuring a B-LT signature (with a TSA) and
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// then calling upgradeToLta(), which selects the pades-b-lta profile and forces the
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// LTV material on. The signing process and this demo's limitations are rendered
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// into the document itself (see the explanatory block added below).
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$pdf
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->signature()
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->configure([
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'profile' => 'pades-b-lt',
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'digest_algorithm' => 'sha256',
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'cert_type' => 2,
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'info' => [
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'ContactInfo' => 'https://github.com/tecnickcom/tc-lib-pdf',
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'Location' => 'Demo Office',
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'Name' => 'tc-lib-pdf',
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'Reason' => 'PAdES-BASELINE-LTA archive-timestamped signature example',
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],
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'password' => '',
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'privkey' => $cert,
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'signcert' => $cert,
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'ltv' => [
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'enabled' => true,
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'embed_ocsp' => true,
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'embed_crl' => true,
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'embed_certs' => true,
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'include_dss' => true,
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'include_vri' => true,
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],
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])
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->timestamp([
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'enabled' => true,
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// Public demo endpoint. For production use your trusted TSA service.
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'host' => 'https://freetsa.org/tsr',
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'username' => '',
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'password' => '',
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'cert' => '',
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'hash_algorithm' => 'sha256',
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'policy_oid' => '',
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'nonce_enabled' => true,
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'timeout' => 30,
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'verify_peer' => true,
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])
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->upgradeToLta();
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$pdf->signature()->appearance()->place(posx: 15, posy: 40, width: 90, height: 20, page: -1, name: 'ArchiveSignature');
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// Appearance stream marking the long-term archival intent of the signature.
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$sigW = 90.0;
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$sigH = 20.0;
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$sigTopY = $page['height'] - $sigH;
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$sigAppearance = $bfont['out'];
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$sigAppearance .= $pdf->color->getPdfColor('rgb(15%,15%,15%)');
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$sigAppearance .= $pdf->getTextCell(
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txt: 'PAdES B-LTA Archive Signature',
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posx: 0,
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posy: $sigTopY,
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width: $sigW,
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height: $sigH,
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offset: 3.0,
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linespace: 0,
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valign: \Com\Tecnick\Pdf\TextVAlign::Center,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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cell: null,
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styles: [
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'all' => [
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'fillColor' => 'rgb(93%,93%,98%)',
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'lineColor' => 'rgb(30%,30%,55%)',
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'lineWidth' => 1.0,
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],
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],
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strokewidth: 0,
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wordspacing: 0,
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leading: 0,
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rise: 0,
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jlast: true,
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fill: true,
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stroke: false,
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underline: false,
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linethrough: false,
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overline: false,
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clip: false,
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drawcell: true,
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);
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$pdf
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->signature()
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->appearance()
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->stream(stream: $sigAppearance, mode: \Com\Tecnick\Pdf\Signature\SignatureAppearanceMode::Normal);
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// Render the signing process and the demo's limitations into the document so the
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// output PDF is self-documenting (this text is page content, not part of the
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// signed appearance stream).
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$explainHtml = <<<HTML
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<h2 style="font-size:11pt;color:#1f2a33;">How this PAdES-BASELINE-LTA signature is produced</h2>
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<p style="font-size:9pt;color:#1f2a33;">Configuring a B-LT signature (with a TSA) and then calling
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<code>upgradeToLta()</code> selects the pades-b-lta profile and forces the LTV material on, so the output
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carries three incremental revisions: the CAdES signature with its RFC 3161 signature timestamp (B-T),
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the DSS/VRI validation material (B-LT), and a <code>/Type /DocTimeStamp</code> archive timestamp
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(<code>/SubFilter /ETSI.RFC3161</code>) whose messageImprint covers the whole document up to that
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revision (B-LTA). The archive timestamp protects the signature and its validation material over the long
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term, even after the signing certificate or its algorithms weaken.</p>
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<h2 style="font-size:11pt;color:#7a1f1f;">Limitations of this demo</h2>
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<ul style="font-size:9pt;color:#1f2a33;">
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<li>Two live RFC 3161 requests are made: one for the signature timestamp and one for the archive
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timestamp. A configured, reachable TSA is required for both; if the TSA is unreachable or rejects a
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request the signing step throws a signing exception and no PDF is produced.</li>
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<li>As in E009, the bundled self-signed demo certificate carries no OCSP/CRL responders, so the DSS
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embeds only certificates and a validator reports B-T with a DSS and an archive timestamp rather than a
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full B-LTA. A CA-issued certificate with reachable revocation responders is needed for a full B-LTA
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verdict.</li>
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</ul>
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HTML;
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$pdf->addHTMLCell(html: $explainHtml, posx: 15, posy: 66, width: 180);
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$rawpdf = $pdf->getOutPDFString();
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$pdf->renderPDF(rawpdf: $rawpdf);
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