date.chapril.org-framadate/app/classes/Framadate/Security/Token.php

106 lines
2.9 KiB
PHP

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