91 lines
2.6 KiB
PHP
91 lines
2.6 KiB
PHP
<?php
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namespace Framadate\Security;
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class Token {
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private $time;
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private $value;
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private $length;
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private static $codeAlphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789';
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function __construct($length = 64) {
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$this->length = $length;
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$this->time = time() + TOKEN_TIME;
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$this->value = $this->generate();
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}
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private function generate() {
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return self::getToken($this->length);
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}
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public function getTime() {
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return $this->time;
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}
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public function getValue() {
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return $this->value;
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}
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public function isGone() {
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return $this->time < time();
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}
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public function check($value) {
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return $value === $this->value;
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}
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/**
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* Get a secure token if possible, or a less secure one if not.
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*
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* @param int $length The token length
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* @param bool $crypto_strong If passed, tells if the token is "cryptographically strong" or not.
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* @return string
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*/
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public static function getToken($length, &$crypto_strong = false) {
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if (function_exists('openssl_random_pseudo_bytes')) {
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openssl_random_pseudo_bytes(1, $crypto_strong); // Fake use to see if the algorithm used was "cryptographically strong"
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return self::getSecureToken($length);
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}
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return self::getUnsecureToken($length);
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}
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public static function getUnsecureToken($length) {
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$string = '';
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mt_srand();
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for ($i = 0; $i < $length; $i++) {
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$string .= self::$codeAlphabet[mt_rand() % strlen(self::$codeAlphabet)];
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}
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return $string;
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}
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/**
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* @author http://stackoverflow.com/a/13733588
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*/
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public static function getSecureToken($length){
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$token = "";
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for($i=0;$i<$length;$i++){
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$token .= self::$codeAlphabet[self::crypto_rand_secure(0,strlen(self::$codeAlphabet))];
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}
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return $token;
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}
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/**
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* @author http://us1.php.net/manual/en/function.openssl-random-pseudo-bytes.php#104322
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*/
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private static function crypto_rand_secure($min, $max) {
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$range = $max - $min;
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if ($range < 0) return $min; // not so random...
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$log = log($range, 2);
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$bytes = (int) ($log / 8) + 1; // length in bytes
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$bits = (int) $log + 1; // length in bits
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$filter = (int) (1 << $bits) - 1; // set all lower bits to 1
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do {
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$rnd = hexdec(bin2hex(openssl_random_pseudo_bytes($bytes)));
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$rnd = $rnd & $filter; // discard irrelevant bits
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} while ($rnd >= $range);
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return $min + $rnd;
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}
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}
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