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1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Pdf\Core\Security;
6
7use Phpdftk\Pdf\Core\PdfArray;
8use Phpdftk\Pdf\Core\PdfDictionary;
9use Phpdftk\Pdf\Core\PdfName;
10use Phpdftk\Pdf\Core\PdfNumber;
11use Phpdftk\Pdf\Core\PdfString;
12use Phpdftk\Pdf\Core\PdfVersion;
13use Phpdftk\Pdf\Core\RequiresPdfVersion;
14use Phpdftk\Pdf\Core\Serializable;
15
16/**
17 * Public-key recipient dictionary — ISO 32000-2 §7.6.5.3, Table 27.
18 *
19 * A single entry in the /Recipients array of a public-key crypt filter.
20 * Carries the PKCS#7 envelope that encrypts the file encryption key for
21 * one recipient plus that recipient's access permissions.
22 */
23#[RequiresPdfVersion(PdfVersion::V1_5)]
24class PublicKeyRecipient implements Serializable
25{
26    public PdfString $pkcs7;            // the envelope (byte string)
27    public ?int $p = null;              // /P permissions
28    public ?PdfArray $recipient = null; // optional /Recipient identity
29
30    public function __construct(PdfString $pkcs7)
31    {
32        $this->pkcs7 = $pkcs7;
33    }
34
35    public function toPdf(): string
36    {
37        $dict = new PdfDictionary();
38        $dict->set('PKCS7', $this->pkcs7);
39        if ($this->p !== null) {
40            $dict->set('P', new PdfNumber($this->p));
41        }
42        if ($this->recipient !== null) {
43            $dict->set('Recipient', $this->recipient);
44        }
45        return $dict->toPdf();
46    }
47}