|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
/* |
|
4
|
|
|
* The MIT License (MIT) |
|
5
|
|
|
* |
|
6
|
|
|
* Copyright (c) 2014-2016 Spomky-Labs |
|
7
|
|
|
* |
|
8
|
|
|
* This software may be modified and distributed under the terms |
|
9
|
|
|
* of the MIT license. See the LICENSE file for details. |
|
10
|
|
|
*/ |
|
11
|
|
|
|
|
12
|
|
|
namespace Jose\Algorithm\ContentEncryption; |
|
13
|
|
|
|
|
14
|
|
|
use Assert\Assertion; |
|
15
|
|
|
use Jose\Algorithm\ContentEncryptionAlgorithmInterface; |
|
16
|
|
|
|
|
17
|
|
|
abstract class AESCBCHS implements ContentEncryptionAlgorithmInterface |
|
18
|
|
|
{ |
|
19
|
|
|
/** |
|
20
|
|
|
* {@inheritdoc} |
|
21
|
|
|
*/ |
|
22
|
|
|
public function encryptContent($data, $cek, $iv, $aad, $encoded_protected_header, &$tag) |
|
23
|
|
|
{ |
|
24
|
|
|
$k = mb_substr($cek, mb_strlen($cek, '8bit') / 2, null, '8bit'); |
|
25
|
|
|
|
|
26
|
|
|
$cyphertext = openssl_encrypt($data, $this->getMode($k), $k, OPENSSL_RAW_DATA, $iv); |
|
27
|
|
|
|
|
28
|
|
|
$tag = $this->calculateAuthenticationTag($cyphertext, $cek, $iv, $aad, $encoded_protected_header); |
|
29
|
|
|
|
|
30
|
|
|
return $cyphertext; |
|
31
|
|
|
} |
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* @param string $data |
|
35
|
|
|
* @param string $cek |
|
36
|
|
|
* @param string $iv |
|
37
|
|
|
* @param string $aad |
|
38
|
|
|
* @param string $encoded_protected_header |
|
39
|
|
|
* @param string|null $aad |
|
40
|
|
|
* @param string $tag |
|
41
|
|
|
* |
|
42
|
|
|
* @return string |
|
43
|
|
|
*/ |
|
44
|
|
|
public function decryptContent($data, $cek, $iv, $aad, $encoded_protected_header, $tag) |
|
45
|
|
|
{ |
|
46
|
|
|
Assertion::true( |
|
47
|
|
|
$this->isTagValid($data, $cek, $iv, $aad, $encoded_protected_header, $tag), |
|
48
|
|
|
'Unable to verify the tag.' |
|
49
|
|
|
); |
|
50
|
|
|
|
|
51
|
|
|
$k = mb_substr($cek, mb_strlen($cek, '8bit') / 2, null, '8bit'); |
|
52
|
|
|
|
|
53
|
|
|
return openssl_decrypt($data, self::getMode($k), $k, OPENSSL_RAW_DATA, $iv); |
|
54
|
|
|
} |
|
55
|
|
|
|
|
56
|
|
|
/** |
|
57
|
|
|
* @param $encrypted_data |
|
58
|
|
|
* @param $cek |
|
59
|
|
|
* @param $iv |
|
60
|
|
|
* @param $aad |
|
61
|
|
|
* @param string $encoded_header |
|
62
|
|
|
* |
|
63
|
|
|
* @return string |
|
64
|
|
|
*/ |
|
65
|
|
|
protected function calculateAuthenticationTag($encrypted_data, $cek, $iv, $aad, $encoded_header) |
|
66
|
|
|
{ |
|
67
|
|
|
$calculated_aad = $encoded_header; |
|
68
|
|
|
if (null !== $aad) { |
|
69
|
|
|
$calculated_aad .= '.'.$aad; |
|
70
|
|
|
} |
|
71
|
|
|
$mac_key = mb_substr($cek, 0, mb_strlen($cek, '8bit') / 2, '8bit'); |
|
72
|
|
|
$auth_data_length = mb_strlen($encoded_header, '8bit'); |
|
73
|
|
|
|
|
74
|
|
|
$secured_input = implode('', [ |
|
75
|
|
|
$calculated_aad, |
|
76
|
|
|
$iv, |
|
77
|
|
|
$encrypted_data, |
|
78
|
|
|
pack('N2', ($auth_data_length / 2147483647) * 8, ($auth_data_length % 2147483647) * 8), // str_pad(dechex($auth_data_length), 4, "0", STR_PAD_LEFT) |
|
79
|
|
|
]); |
|
80
|
|
|
$hash = hash_hmac($this->getHashAlgorithm(), $secured_input, $mac_key, true); |
|
81
|
|
|
|
|
82
|
|
|
return mb_substr($hash, 0, mb_strlen($hash, '8bit') / 2, '8bit'); |
|
83
|
|
|
} |
|
84
|
|
|
|
|
85
|
|
|
/** |
|
86
|
|
|
* @param string $authentication_tag |
|
87
|
|
|
* @param string $encoded_header |
|
88
|
|
|
* @param string $encrypted_data |
|
89
|
|
|
* @param string $cek |
|
90
|
|
|
* @param string $iv |
|
91
|
|
|
* @param string|null $aad |
|
92
|
|
|
* |
|
93
|
|
|
* @return bool |
|
94
|
|
|
*/ |
|
95
|
|
|
protected function isTagValid($encrypted_data, $cek, $iv, $aad, $encoded_header, $authentication_tag) |
|
96
|
|
|
{ |
|
97
|
|
|
return $authentication_tag === $this->calculateAuthenticationTag($encrypted_data, $cek, $iv, $aad, $encoded_header); |
|
98
|
|
|
} |
|
99
|
|
|
|
|
100
|
|
|
/** |
|
101
|
|
|
* @return string |
|
102
|
|
|
*/ |
|
103
|
|
|
abstract protected function getHashAlgorithm(); |
|
104
|
|
|
|
|
105
|
|
|
/** |
|
106
|
|
|
* @return int |
|
107
|
|
|
*/ |
|
108
|
|
|
public function getIVSize() |
|
109
|
|
|
{ |
|
110
|
|
|
return 128; |
|
111
|
|
|
} |
|
112
|
|
|
|
|
113
|
|
|
/** |
|
114
|
|
|
* @param string $k |
|
115
|
|
|
* |
|
116
|
|
|
* @return string |
|
117
|
|
|
*/ |
|
118
|
|
|
private function getMode($k) |
|
119
|
|
|
{ |
|
120
|
|
|
return 'aes-'.(8 * mb_strlen($k, '8bit')).'-cbc'; |
|
121
|
|
|
} |
|
122
|
|
|
} |
|
123
|
|
|
|
Spomky-Labs /
jose
