|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
namespace SimpleSAML\XMLSecurity\Alg; |
|
6
|
|
|
|
|
7
|
|
|
use SimpleSAML\Assert\Assert; |
|
8
|
|
|
use SimpleSAML\XMLSecurity\Exception\BlacklistedAlgorithmException; |
|
9
|
|
|
use SimpleSAML\XMLSecurity\Exception\UnsupportedAlgorithmException; |
|
10
|
|
|
use SimpleSAML\XMLSecurity\Key\AbstractKey; |
|
11
|
|
|
|
|
12
|
|
|
/** |
|
13
|
|
|
* An abstract class implementing an algorithm factory. |
|
14
|
|
|
* |
|
15
|
|
|
* Extending classes MUST declare two static properties: |
|
16
|
|
|
* |
|
17
|
|
|
* - $cache: an associative array holding algorithm IDs as the keys, and class names implementing those algorithms as |
|
18
|
|
|
* the value. |
|
19
|
|
|
* - $initialized: a boolean telling whether this factory has been initialized (a constructor has been called) or not. |
|
20
|
|
|
* |
|
21
|
|
|
* @package simplesamlphp/xml-security |
|
22
|
|
|
*/ |
|
23
|
|
|
abstract class AbstractAlgorithmFactory |
|
24
|
|
|
{ |
|
25
|
|
|
/** |
|
26
|
|
|
* An array of blacklisted algorithms. |
|
27
|
|
|
* |
|
28
|
|
|
* @var string[] |
|
29
|
|
|
*/ |
|
30
|
|
|
protected array $blacklist = []; |
|
31
|
|
|
|
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* Build a factory that creates algorithms. |
|
35
|
|
|
* |
|
36
|
|
|
* @param string[]|null $blacklist A list of algorithms forbidden for their use. |
|
37
|
|
|
* @param string[]|null $defaults A list of known implementations. |
|
38
|
|
|
*/ |
|
39
|
|
|
public function __construct(array $blacklist = null, array $defaults = null) |
|
40
|
|
|
{ |
|
41
|
|
|
if ($blacklist !== null) { |
|
42
|
|
|
$this->blacklist = $blacklist; |
|
43
|
|
|
} |
|
44
|
|
|
|
|
45
|
|
|
// initialize the cache for supported algorithms per known implementation |
|
46
|
|
|
if (!static::$initialized && $defaults !== null) { |
|
47
|
|
|
foreach ($defaults as $algorithm) { |
|
48
|
|
|
/** @var \SimpleSAML\XMLSecurity\Alg\AlgorithmInterface $algorithm */ |
|
49
|
|
|
foreach ($algorithm::getSupportedAlgorithms() as $algId) { |
|
50
|
|
|
if (array_key_exists($algId, static::$cache)) { |
|
51
|
|
|
/* |
|
52
|
|
|
* If the key existed before initialization, that means someone registered a handler for this |
|
53
|
|
|
* algorithm, so we should respect that and skip registering the default here. |
|
54
|
|
|
*/ |
|
55
|
|
|
continue; |
|
56
|
|
|
} |
|
57
|
|
|
static::$cache[$algId] = $algorithm; |
|
|
|
|
|
|
58
|
|
|
} |
|
59
|
|
|
} |
|
60
|
|
|
static::$initialized = true; |
|
|
|
|
|
|
61
|
|
|
} |
|
62
|
|
|
} |
|
63
|
|
|
|
|
64
|
|
|
|
|
65
|
|
|
/** |
|
66
|
|
|
* Get a new object implementing the given algorithm. |
|
67
|
|
|
* |
|
68
|
|
|
* @param string $algId The identifier of the algorithm desired. |
|
69
|
|
|
* @param \SimpleSAML\XMLSecurity\Key\AbstractKey $key The key to use with the given algorithm. |
|
70
|
|
|
* |
|
71
|
|
|
* @return \SimpleSAML\XMLSecurity\Alg\AlgorithmInterface An object implementing the given algorithm. |
|
72
|
|
|
* |
|
73
|
|
|
* @throws \SimpleSAML\XMLSecurity\Exception\InvalidArgumentException If an error occurs, e.g. the given algorithm |
|
74
|
|
|
* is blacklisted, unknown or the given key is not suitable for it. |
|
75
|
|
|
*/ |
|
76
|
|
|
public function getAlgorithm(string $algId, AbstractKey $key): AlgorithmInterface |
|
77
|
|
|
{ |
|
78
|
|
|
Assert::true( |
|
79
|
|
|
!in_array($algId, $this->blacklist, true), |
|
80
|
|
|
sprintf('Blacklisted algorithm: \'%s\'.', $algId), |
|
81
|
|
|
BlacklistedAlgorithmException::class |
|
82
|
|
|
); |
|
83
|
|
|
Assert::keyExists( |
|
84
|
|
|
static::$cache, |
|
85
|
|
|
$algId, |
|
86
|
|
|
sprintf('Unknown or unsupported algorithm: \'%s\'.', $algId), |
|
87
|
|
|
UnsupportedAlgorithmException::class |
|
88
|
|
|
); |
|
89
|
|
|
|
|
90
|
|
|
return new static::$cache[$algId]($key, $algId); |
|
91
|
|
|
} |
|
92
|
|
|
|
|
93
|
|
|
|
|
94
|
|
|
/** |
|
95
|
|
|
* Get the name of the abstract class our algorithm implementations must extend. |
|
96
|
|
|
* |
|
97
|
|
|
* @return string |
|
98
|
|
|
*/ |
|
99
|
|
|
abstract protected static function getExpectedParent(): string; |
|
100
|
|
|
|
|
101
|
|
|
|
|
102
|
|
|
/** |
|
103
|
|
|
* Register an implementation of some algorithm(s) for its use. |
|
104
|
|
|
* |
|
105
|
|
|
* @param string $className |
|
106
|
|
|
*/ |
|
107
|
|
|
public static function registerAlgorithm(string $className): void |
|
108
|
|
|
{ |
|
109
|
|
|
$parent = static::getExpectedParent(); |
|
110
|
|
|
Assert::subclassOf( |
|
111
|
|
|
$className, |
|
112
|
|
|
$parent, |
|
113
|
|
|
'Cannot register algorithm "' . $className . '", must implement ' . $parent . '.' |
|
114
|
|
|
); |
|
115
|
|
|
|
|
116
|
|
|
/** @var \SimpleSAML\XMLSecurity\Alg\AlgorithmInterface $className */ |
|
117
|
|
|
foreach ($className::getSupportedAlgorithms() as $algId) { |
|
118
|
|
|
static::$cache[$algId] = $className; |
|
|
|
|
|
|
119
|
|
|
} |
|
120
|
|
|
} |
|
121
|
|
|
} |
|
122
|
|
|
|
simplesamlphp /
xml-security
Loading history...