|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* BaconPdf |
|
4
|
|
|
* |
|
5
|
|
|
* @link http://github.com/Bacon/BaconPdf For the canonical source repository |
|
6
|
|
|
* @copyright 2015 Ben Scholzen (DASPRiD) |
|
7
|
|
|
* @license http://opensource.org/licenses/BSD-2-Clause Simplified BSD License |
|
8
|
|
|
*/ |
|
9
|
|
|
|
|
10
|
|
|
namespace Bacon\Pdf\Encryption; |
|
11
|
|
|
|
|
12
|
|
|
use Bacon\Pdf\Writer\ObjectWriter; |
|
13
|
|
|
|
|
14
|
|
|
/** |
|
15
|
|
|
* Encryption for handling PDF version 1.6 and above. |
|
16
|
|
|
*/ |
|
17
|
|
|
class Pdf16Encryption extends Pdf14Encryption |
|
18
|
|
|
{ |
|
19
|
|
|
/** |
|
20
|
|
|
* {@inheritdoc} |
|
21
|
|
|
*/ |
|
22
|
|
|
protected function writeAdditionalEncryptDictionaryEntries(ObjectWriter $objectWriter) |
|
23
|
|
|
{ |
|
24
|
|
|
parent::writeAdditionalEncryptDictionaryEntries($objectWriter); |
|
25
|
|
|
|
|
26
|
|
|
$objectWriter->writeName('CF'); |
|
27
|
|
|
$objectWriter->startDictionary(); |
|
28
|
|
|
|
|
29
|
|
|
$objectWriter->writeName('StdCF'); |
|
30
|
|
|
$objectWriter->startDictionary(); |
|
31
|
|
|
|
|
32
|
|
|
$objectWriter->writeName('Type'); |
|
33
|
|
|
$objectWriter->writeName('CryptFilter'); |
|
34
|
|
|
|
|
35
|
|
|
$objectWriter->writeName('CFM'); |
|
36
|
|
|
$objectWriter->writeName('AESV2'); |
|
37
|
|
|
|
|
38
|
|
|
$objectWriter->writeName('Length'); |
|
39
|
|
|
$objectWriter->writeNumber(128); |
|
40
|
|
|
|
|
41
|
|
|
$objectWriter->endDictionary(); |
|
42
|
|
|
$objectWriter->endDictionary(); |
|
43
|
|
|
|
|
44
|
|
|
$objectWriter->writeName('StrF'); |
|
45
|
|
|
$objectWriter->writeName('StdCF'); |
|
46
|
|
|
|
|
47
|
|
|
$objectWriter->writeName('StmF'); |
|
48
|
|
|
$objectWriter->writeName('StdCF'); |
|
49
|
|
|
} |
|
50
|
|
|
|
|
51
|
|
|
/** |
|
52
|
|
|
* {@inheritdoc} |
|
53
|
|
|
*/ |
|
54
|
|
|
public function encrypt($plaintext, $objectNumber, $generationNumber) |
|
55
|
|
|
{ |
|
56
|
|
|
$initializationVector = openssl_random_pseudo_bytes(16); |
|
57
|
|
|
|
|
58
|
|
|
return $initializationVector . openssl_encrypt( |
|
59
|
|
|
$plaintext, |
|
60
|
|
|
'aes-128-cbc', |
|
61
|
|
|
$this->computeIndividualEncryptionKey($objectNumber, $generationNumber) . "\x73\x41\x6c\x54", |
|
62
|
|
|
true, |
|
63
|
|
|
$initializationVector |
|
64
|
|
|
); |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
/** |
|
68
|
|
|
* {@inheritdoc} |
|
69
|
|
|
*/ |
|
70
|
|
|
protected function getRevision() |
|
71
|
|
|
{ |
|
72
|
|
|
return 4; |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
|
|
/** |
|
76
|
|
|
* {@inheritdoc} |
|
77
|
|
|
*/ |
|
78
|
|
|
protected function getAlgorithm() |
|
79
|
|
|
{ |
|
80
|
|
|
return 4; |
|
81
|
|
|
} |
|
82
|
|
|
} |
|
83
|
|
|
|
Bacon /
BaconPdf
