68 lines
2.2 KiB
PHP
68 lines
2.2 KiB
PHP
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<?php
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namespace Core;
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readonly class TOTP
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{
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private const BASE32CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'; // RFC 4648 Base32
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public function __construct(private string $secret) {}
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public static function otpSecret($uniqueString, $length = 20): string
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{
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// Уникальная строка + текущее время в микросекундах
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$seed = $uniqueString . microtime(true);
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// Хэшируем сид для более случайного распределения
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$seed = hash('sha256', $seed);
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$secret = '';
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$max = strlen(self::BASE32CHARS) - 1;
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// Генерируем случайную строку нужной длины
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for ($i = 0; $i < $length; $i++) {
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$index = hexdec(substr($seed, $i, 2)) % $max; // Получаем индекс символа из хэшированного сида
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$secret .= self::BASE32CHARS[$index];
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}
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return $secret;
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}
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public function generate(int $digits = 6, int $timeStep = 30): string
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{
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$time = floor(time() / $timeStep);
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$secretKey = $this->base32_decode($this->secret);
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$binaryTime = pack('N*', 0) . pack('N*', $time);
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$hash = hash_hmac('sha1', $binaryTime, $secretKey, true);
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$offset = ord($hash[strlen($hash) - 1]) & 0x0F;
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$otp = (
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((ord($hash[$offset]) & 0x7F) << 24) |
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((ord($hash[$offset + 1]) & 0xFF) << 16) |
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((ord($hash[$offset + 2]) & 0xFF) << 8) |
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(ord($hash[$offset + 3]) & 0xFF)
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) % 10 ** $digits;
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return str_pad((string)$otp, $digits, '0', STR_PAD_LEFT);
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}
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private function base32_decode(string $input): string
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{
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$base32charsFlipped = array_flip(str_split(self::BASE32CHARS));
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$output = '';
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$v = 0;
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$vbits = 0;
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for ($i = 0, $j = strlen($input); $i < $j; $i++) {
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$v <<= 5;
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if ($input[$i] == '=') continue;
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$v += $base32charsFlipped[$input[$i]];
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$vbits += 5;
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if ($vbits >= 8) {
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$vbits -= 8;
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$output .= chr(($v & (0xFF << $vbits)) >> $vbits);
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}
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}
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return $output;
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}
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}
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