| 1: | <?php declare(strict_types=1); |
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| 13: | namespace Clansuite\ServerQuery\Util; |
| 14: | |
| 15: | use const PHP_INT_MAX; |
| 16: | use function random_int; |
| 17: | |
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| 21: | final class SteamProxyHelper |
| 22: | { |
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| 24: | |
| 25: | |
| 26: | private array $challenges = []; |
| 27: | private int $index = 0; |
| 28: | private readonly int $size; |
| 29: | |
| 30: | public static function jenkinsHash(int $value): int |
| 31: | { |
| 32: | |
| 33: | $value = ($value + 0x7ED55D16) + (($value << 12) & 0xFFFFFFFF); |
| 34: | $value = ($value ^ 0xC761C23C) ^ (($value >> 19) & 0xFFFFFFFF); |
| 35: | $value = ($value + 0x165667B1) + (($value << 5) & 0xFFFFFFFF); |
| 36: | $value = ($value + 0xD3A2646C) ^ (($value << 9) & 0xFFFFFFFF); |
| 37: | $value = ($value + 0xFD7046C5) + (($value << 3) & 0xFFFFFFFF); |
| 38: | $value = ($value ^ 0xB55A4F09) ^ (($value >> 16) & 0xFFFFFFFF); |
| 39: | |
| 40: | return $value & 0xFFFFFFFF; |
| 41: | } |
| 42: | |
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| 45: | |
| 46: | public function __construct(int $size = 6) |
| 47: | { |
| 48: | $this->size = $size > 0 ? $size : 6; |
| 49: | |
| 50: | |
| 51: | for ($i = 0; $i < $this->size; $i++) { |
| 52: | $this->challengeNew(); |
| 53: | } |
| 54: | } |
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| 58: | |
| 59: | public function challengeNew(): void |
| 60: | { |
| 61: | for ($i = 0; $i < 100; $i++) { |
| 62: | $next = ($this->index + $i) % $this->size; |
| 63: | $new = self::jenkinsHash(random_int(1, PHP_INT_MAX)); |
| 64: | |
| 65: | if ($new === 0) { |
| 66: | continue; |
| 67: | } |
| 68: | |
| 69: | if ($new === 0xFFFFFFFF) { |
| 70: | continue; |
| 71: | } |
| 72: | $this->challenges[$next] = $new & 0xFFFFFFFF; |
| 73: | $this->index = $next; |
| 74: | |
| 75: | return; |
| 76: | } |
| 77: | } |
| 78: | |
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| 81: | |
| 82: | public function challengeGet(int $mutate): int |
| 83: | { |
| 84: | if (!isset($this->challenges[$this->index])) { |
| 85: | |
| 86: | $this->challengeNew(); |
| 87: | } |
| 88: | |
| 89: | $challenge = $this->challenges[$this->index] ?? 0; |
| 90: | |
| 91: | return ($challenge + self::jenkinsHash($mutate)) & 0xFFFFFFFF; |
| 92: | } |
| 93: | |
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| 95: | |
| 96: | |
| 97: | public function challengeValidate(int $challenge, int $mutate): bool |
| 98: | { |
| 99: | if ($challenge === 0 || $challenge === 0xFFFFFFFF) { |
| 100: | return false; |
| 101: | } |
| 102: | |
| 103: | $idx = $this->index; |
| 104: | |
| 105: | for ($i = 0; $i < $this->size; $i++) { |
| 106: | if (!isset($this->challenges[$idx])) { |
| 107: | return false; |
| 108: | } |
| 109: | $chVal = $this->challenges[$idx]; |
| 110: | $check = ($chVal + self::jenkinsHash($mutate)) & 0xFFFFFFFF; |
| 111: | |
| 112: | if ($check === ($challenge & 0xFFFFFFFF)) { |
| 113: | return true; |
| 114: | } |
| 115: | $idx++; |
| 116: | |
| 117: | if ($idx === $this->size) { |
| 118: | $idx = 0; |
| 119: | } |
| 120: | } |
| 121: | |
| 122: | return false; |
| 123: | } |
| 124: | } |
| 125: | |