61 lines
2.0 KiB
PHP
61 lines
2.0 KiB
PHP
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<?php
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declare(strict_types=1);
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/**
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* DocTimeStamp.php
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*
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* @since 2026-07-15
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* @category Library
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* @package PdfSign
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* @author Nicola Asuni <info@tecnick.com>
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* @copyright 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-sign
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*
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* This file is part of tc-lib-pdf-sign software library.
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*/
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namespace Com\Tecnick\Pdf\Sign\Output;
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/**
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* Com\Tecnick\Pdf\Sign\Output\DocTimeStamp
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*
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* Emits a document timestamp value object (/Type /DocTimeStamp,
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* /SubFilter /ETSI.RFC3161) whose /Contents is a bare RFC 3161 timestamp token.
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* It is added in an incremental update to reach PAdES B-LTA. It shares the
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* /ByteRange and /Contents placeholders with the signature value object so the
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* host's signing pass locates them the same way for either object type.
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*
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* @since 2026-07-15
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* @category Library
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* @package PdfSign
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* @author Nicola Asuni <info@tecnick.com>
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* @copyright 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-sign
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*/
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final class DocTimeStamp
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{
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/**
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* SubFilter for an RFC 3161 document timestamp.
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*/
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public const SUB_FILTER = 'ETSI.RFC3161';
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/**
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* Emit the /DocTimeStamp value object.
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*
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* @param int $objectId Object number for the value object.
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* @param int $contentsLength Placeholder length reserved for the token.
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*/
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public function valueObject(int $objectId, int $contentsLength = Signature::DEFAULT_CONTENTS_LENGTH): string
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{
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$out = $objectId . " 0 obj\n";
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$out .= '<< /Type /DocTimeStamp /Filter /Adobe.PPKLite /SubFilter /' . self::SUB_FILTER . ' ';
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$out .= Signature::BYTE_RANGE_PLACEHOLDER;
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$out .= ' /Contents<' . \str_repeat('0', \max(0, $contentsLength)) . '>';
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return $out . " >>\nendobj\n";
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}
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}
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