|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
/* |
|
4
|
|
|
* This file is part of the tmilos/jose-jwt package. |
|
5
|
|
|
* |
|
6
|
|
|
* (c) Milos Tomic <[email protected]> |
|
7
|
|
|
* |
|
8
|
|
|
* This source file is subject to the MIT license that is bundled |
|
9
|
|
|
* with this source code in the file LICENSE. |
|
10
|
|
|
*/ |
|
11
|
|
|
|
|
12
|
|
|
namespace Tmilos\JoseJwt; |
|
13
|
|
|
|
|
14
|
|
|
use Tmilos\JoseJwt\Context\Context; |
|
15
|
|
|
use Tmilos\JoseJwt\Error\JoseJwtException; |
|
16
|
|
|
use Tmilos\JoseJwt\Util\StringUtils; |
|
17
|
|
|
use Tmilos\JoseJwt\Util\UrlSafeB64Encoder; |
|
18
|
|
|
|
|
19
|
|
|
class Jwe |
|
20
|
|
|
{ |
|
21
|
|
|
private function __construct() |
|
22
|
|
|
{ |
|
23
|
|
|
} |
|
24
|
|
|
|
|
25
|
|
|
/** |
|
26
|
|
|
* @param Context $context |
|
27
|
|
|
* @param $payload |
|
28
|
|
|
* @param $key |
|
29
|
|
|
* @param $jweAlgorithm |
|
30
|
|
|
* @param $jweEncryption |
|
31
|
|
|
* @param array $extraHeaders |
|
32
|
|
|
* |
|
33
|
|
|
* @return string |
|
34
|
|
|
*/ |
|
35
|
|
|
public static function encode(Context $context, $payload, $key, $jweAlgorithm, $jweEncryption, array $extraHeaders = []) |
|
36
|
|
|
{ |
|
37
|
|
|
if (empty($payload) || (is_string($payload) && trim($payload) == '')) { |
|
38
|
|
|
throw new JoseJwtException('Payload can not be empty'); |
|
39
|
|
|
} |
|
40
|
|
|
$algorithm = $context->jweAlgorithms()->get($jweAlgorithm); |
|
41
|
|
|
if (null === $algorithm) { |
|
42
|
|
|
throw new JoseJwtException(sprintf('Invalid or unsupported algorithm "%s"', $jweAlgorithm)); |
|
43
|
|
|
} |
|
44
|
|
|
$encryption = $context->jweEncryptions()->get($jweEncryption); |
|
45
|
|
|
if (null === $encryption) { |
|
46
|
|
|
throw new JoseJwtException(sprintf('Invalid or unsupported encryption "%s"', $jweEncryption)); |
|
47
|
|
|
} |
|
48
|
|
|
|
|
49
|
|
|
$header = array_merge([ |
|
50
|
|
|
'alg' => $jweAlgorithm, |
|
51
|
|
|
'enc' => $jweEncryption, |
|
52
|
|
|
'typ' => 'JWT', |
|
53
|
|
|
], $extraHeaders); |
|
54
|
|
|
|
|
55
|
|
|
list($cek, $encryptedCek) = $algorithm->wrapNewKey($encryption->getKeySize(), $key, $header); |
|
56
|
|
|
|
|
57
|
|
|
$payloadString = StringUtils::payload2string($payload, $context->jsonMapper()); |
|
58
|
|
|
|
|
59
|
|
|
$headerString = json_encode($header); |
|
60
|
|
|
$aad = UrlSafeB64Encoder::encode($headerString); |
|
61
|
|
|
$parts = $encryption->encrypt($aad, $payloadString, $cek); |
|
62
|
|
|
|
|
63
|
|
|
return implode('.', [ |
|
64
|
|
|
UrlSafeB64Encoder::encode($headerString), |
|
65
|
|
|
UrlSafeB64Encoder::encode($encryptedCek), |
|
66
|
|
|
UrlSafeB64Encoder::encode($parts[0]), |
|
67
|
|
|
UrlSafeB64Encoder::encode($parts[1]), |
|
68
|
|
|
UrlSafeB64Encoder::encode($parts[2]), |
|
69
|
|
|
]); |
|
70
|
|
|
} |
|
71
|
|
|
|
|
72
|
|
|
/** |
|
73
|
|
|
* @param Context $context |
|
74
|
|
|
* @param string $token |
|
75
|
|
|
* @param string|resource $key |
|
76
|
|
|
* |
|
77
|
|
|
* @return string |
|
78
|
|
|
*/ |
|
79
|
|
|
public static function decode(Context $context, $token, $key) |
|
80
|
|
|
{ |
|
81
|
|
|
$parts = self::getParts($token); |
|
82
|
|
|
$decodedParts = self::decodeParts($parts); |
|
83
|
|
|
|
|
84
|
|
|
$headerString = $decodedParts[0]; |
|
85
|
|
|
$encryptedCek = $decodedParts[1]; |
|
86
|
|
|
$iv = $decodedParts[2]; |
|
87
|
|
|
$cipherText = $decodedParts[3]; |
|
88
|
|
|
$authTag = $decodedParts[4]; |
|
89
|
|
|
|
|
90
|
|
|
$header = json_decode($headerString, true); |
|
91
|
|
|
if (null === $header) { |
|
92
|
|
|
throw new JoseJwtException('Invalid header'); |
|
93
|
|
|
} |
|
94
|
|
|
|
|
95
|
|
|
$algorithm = $context->jweAlgorithms()->get($header['alg']); |
|
96
|
|
|
$encryption = $context->jweEncryptions()->get($header['enc']); |
|
97
|
|
|
|
|
98
|
|
|
$cek = $algorithm->unwrap($encryptedCek, $key, $encryption->getKeySize(), $header); |
|
99
|
|
|
$aad = $parts[0]; |
|
100
|
|
|
|
|
101
|
|
|
$plainText = $encryption->decrypt($aad, $cek, $iv, $cipherText, $authTag); |
|
102
|
|
|
|
|
103
|
|
|
return $plainText; |
|
104
|
|
|
} |
|
105
|
|
|
|
|
106
|
|
|
/** |
|
107
|
|
|
* @param string $token |
|
108
|
|
|
* |
|
109
|
|
|
* @return string |
|
110
|
|
|
*/ |
|
111
|
|
|
public static function header($token) |
|
112
|
|
|
{ |
|
113
|
|
|
$parts = self::getParts($token); |
|
114
|
|
|
$decodedParts = self::decodeParts($parts); |
|
115
|
|
|
|
|
116
|
|
|
$headerString = $decodedParts[0]; |
|
117
|
|
|
|
|
118
|
|
|
$header = json_decode($headerString, true); |
|
119
|
|
|
if (null === $header) { |
|
120
|
|
|
throw new JoseJwtException('Invalid header'); |
|
121
|
|
|
} |
|
122
|
|
|
|
|
123
|
|
|
return $header; |
|
124
|
|
|
} |
|
125
|
|
|
|
|
126
|
|
|
/** |
|
127
|
|
|
* @param array $parts [header, encryptedCek, iv, cipherText, authTag] |
|
128
|
|
|
* |
|
129
|
|
|
* @return array |
|
130
|
|
|
*/ |
|
131
|
|
|
private static function decodeParts(array $parts) |
|
132
|
|
|
{ |
|
133
|
|
|
if (count($parts) != 5) { |
|
134
|
|
|
throw new JoseJwtException('Invalid JWE token'); |
|
135
|
|
|
} |
|
136
|
|
|
|
|
137
|
|
|
$decodedParts = []; |
|
138
|
|
|
foreach ($parts as $part) { |
|
139
|
|
|
$decodedParts[] = UrlSafeB64Encoder::decode($part); |
|
140
|
|
|
} |
|
141
|
|
|
|
|
142
|
|
|
return $decodedParts; |
|
143
|
|
|
} |
|
144
|
|
|
|
|
145
|
|
|
/** |
|
146
|
|
|
* @param string $token |
|
147
|
|
|
* |
|
148
|
|
|
* @return array [header, encryptedCek, iv, cipherText, authTag] |
|
149
|
|
|
*/ |
|
150
|
|
|
private static function getParts($token) |
|
151
|
|
|
{ |
|
152
|
|
|
if (empty($token) || trim($token) === '') { |
|
153
|
|
|
throw new JoseJwtException('Incoming token expected to be in compact serialization form, but is empty'); |
|
154
|
|
|
} |
|
155
|
|
|
|
|
156
|
|
|
$parts = explode('.', $token); |
|
157
|
|
|
if (count($parts) != 5) { |
|
158
|
|
|
throw new JoseJwtException('Invalid JWE token'); |
|
159
|
|
|
} |
|
160
|
|
|
|
|
161
|
|
|
return $parts; |
|
162
|
|
|
} |
|
163
|
|
|
} |
|
164
|
|
|
|
tmilos /
jose-jwt
