-
-
Notifications
You must be signed in to change notification settings - Fork 73
/
Energon.php
95 lines (76 loc) · 2.24 KB
/
Energon.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
<?php
namespace Jenssegers\Optimus;
use Jenssegers\Optimus\Exceptions\InvalidPrimeException;
use phpseclib3\Crypt\Random;
use phpseclib3\Math\BigInteger;
class Energon
{
/**
* @var int
*/
protected $prime;
/**
* @var int
*/
private $size;
public function __construct(int $prime = null, int $size = Optimus::DEFAULT_SIZE)
{
$this->setPrime($prime ?? static::generatePrime($size));
$this->setSize($size);
}
public static function generate(int $prime = null, int $size = Optimus::DEFAULT_SIZE): array
{
$instance = new static($prime, $size);
return [
$instance->getPrime(),
$instance->getInverse(),
$instance->getRand(),
];
}
public static function generatePrime(int $size = Optimus::DEFAULT_SIZE): int
{
return (int) BigInteger::randomPrime($size)->toString();
}
public static function calculateInverse(int $prime, int $size = Optimus::DEFAULT_SIZE): int
{
$max = self::createMaxInt($size)->add(new BigInteger(1));
$inverse = (new BigInteger($prime))->modInverse($max);
if (!$inverse) {
throw new InvalidPrimeException($prime);
}
return (int) $inverse->toString();
}
public static function generateRandomInteger(int $size = Optimus::DEFAULT_SIZE): int
{
return (int) (new BigInteger(hexdec(bin2hex(Random::string(4)))))
->bitwise_and(self::createMaxInt($size))
->toString();
}
public function getPrime(): int
{
return $this->prime;
}
public function setPrime(int $prime)
{
if (!(new BigInteger($prime))->isPrime()) {
throw new InvalidPrimeException($prime);
}
$this->prime = $prime;
}
public function setSize(int $size)
{
$this->size = $size;
}
public function getInverse(): int
{
return self::calculateInverse($this->prime, $this->size);
}
public function getRand(): int
{
return static::generateRandomInteger($this->size);
}
protected static function createMaxInt(int $size): BigInteger
{
return (new BigInteger(2 ** $size))->subtract(new BigInteger(1));
}
}