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43 lines
1.1 KiB
43 lines
1.1 KiB
<?php
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/**
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* @param int $length
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* @return string|false
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* @throws Exception
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*/
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function token($length = 32) {
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if(!isset($length) || intval($length) <= 8 ){
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$length = 32;
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}
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if (function_exists('openssl_random_pseudo_bytes')) {
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$token = bin2hex(openssl_random_pseudo_bytes($length));
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} elseif (function_exists('random_bytes')) {
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$token = bin2hex(random_bytes($length));
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} elseif (function_exists('mcrypt_create_iv') && phpversion() < '7.1') {
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$token = bin2hex(mcrypt_create_iv($length, MCRYPT_DEV_URANDOM));
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} else {
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$token = md5(rand(0, 4000).time());
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}
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return substr($token, -$length, $length);
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}
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if (!function_exists('hash_equals')) {
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function hash_equals($known_string, $user_string) {
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$known_string = (string)$known_string;
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$user_string = (string)$user_string;
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if (strlen($known_string) != strlen($user_string)) {
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return false;
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} else {
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$res = $known_string ^ $user_string;
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$ret = 0;
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for ($i = strlen($res) - 1; $i >= 0; $i--) $ret |= ord($res[$i]);
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return !$ret;
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}
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}
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} |