MicroTime::generate() - Code Metrics - ircmaxell/RandomLib - Measure and Improve Code Quality continuously with Scrutinizer

MicroTime::generate() B
last analyzed 2016-09-07 16:00 UTC

↳ Parent: MicroTime

Complexity

Conditions	2
Paths	2

Size

Total Lines	27
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Importance

Changes	5
Bugs	0	Features	1

Metric	Value
c	5
b	0
f	1
dl	0
loc	27
rs	8.8571
cc	2
eloc	12
nc	2
nop	1

<?php

/*
 * The RandomLib library for securely generating random numbers and strings in PHP
 *
 * @author     Anthony Ferrara <[email protected]>
 * @copyright  2011 The Authors
 * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
 * @version    Build @@version@@
 */

/**
 * The Microtime Random Number Source
 *
 * This uses the current micro-second (looped several times) for a **very** weak
 * random number source.  This is only useful when combined with several other
 * stronger sources
 *
 * PHP version 5.3
 *
 * @category   PHPCryptLib
 * @package    Random
 * @subpackage Source
 *
 * @author     Anthony Ferrara <[email protected]>
 * @copyright  2011 The Authors
 * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
 *
 * @version    Build @@version@@
 */
namespace RandomLib\Source;

use SecurityLib\Strength;
use SecurityLib\Util;

/**
 * The Microtime Random Number Source
 *
 * This uses the current micro-second (looped several times) for a **very** weak
 * random number source.  This is only useful when combined with several other
 * stronger sources
 *
 * @category   PHPCryptLib
 * @package    Random
 * @subpackage Source
 *
 * @author     Anthony Ferrara <[email protected]>
 * @codeCoverageIgnore
 */
final class MicroTime extends \RandomLib\AbstractSource
{

    /**
     * A static counter to ensure unique hashes and prevent state collisions
     *
     * @var int A counter
     */
    private static $counter = null;

    /**
     * The current state of the random number generator.
     *
     * @var string The state of the PRNG
     */
    private static $state = '';

    public function __construct()
// Bad
class Router
{
    public function generate($path)
    {
        return $_SERVER['HOST'].$path;
    }
}

// Better
class Router
{
    private $host;

    public function __construct($host)
    {
        $this->host = $host;
    }

    public function generate($path)
    {
        return $this->host.$path;
    }
}

class Controller
{
    public function myAction(Request $request)
    {
        // Instead of
        $page = isset($_GET['page']) ? intval($_GET['page']) : 1;

        // Better (assuming you use the Symfony2 request)
        $page = $request->query->get('page', 1);
    }
}
    {
        $state = self::$state;
        if (function_exists('posix_times')) {
            $state .= serialize(posix_times());
        }
        if (!defined('HHVM_VERSION') && function_exists('zend_thread_id')) {
            $state .= zend_thread_id();
        }
        if (function_exists('hphp_get_thread_id')) {
            $state .= hphp_get_thread_id();
        }
        $state      .= getmypid() . memory_get_usage();
        $state      .= serialize($_ENV);
        $state      .= serialize($_SERVER);
        $state      .= count(debug_backtrace(false));
        self::$state = hash('sha512', $state, true);
        if (is_null(self::$counter)) {
            list(, self::$counter) = unpack("i", Util::safeSubstr(self::$state, 0, 4));
            $seed = $this->generate(Util::safeStrlen(dechex(PHP_INT_MAX)));
            list(, self::$counter) = unpack("i", $seed);
        }
    }

    /**
     * Generate a random string of the specified size
     *
     * @param int $size The size of the requested random string
     *
     * @return string A string of the requested size
     */
    public function generate($size)
    {
        $result      = '';
        $seed        = microtime() . memory_get_usage();
        self::$state = hash('sha512', self::$state . $seed, true);
        /**
         * Make the generated randomness a bit better by forcing a GC run which
         * should complete in a indeterminate amount of time, hence improving
         * the strength of the randomness a bit. It's still not crypto-safe,
         * but at least it's more difficult to predict.
         */
        gc_collect_cycles();
        for ($i = 0; $i < $size; $i += 8) {
            $seed = self::$state .
                    microtime() .
                    pack('Ni', $i, self::counter());
            self::$state = hash('sha512', $seed, true);
            /**
             * We only use the first 8 bytes here to prevent exposing the state
             * in its entirety, which could potentially expose other random
             * generations in the future (in the same process)...
             */
            $result .= Util::safeSubstr(self::$state, 0, 8);
        }

        return Util::safeSubstr($result, 0, $size);
    }

    private static function counter()
    {
        if (self::$counter >= PHP_INT_MAX) {
            self::$counter = -1 * PHP_INT_MAX - 1;
        } else {
            self::$counter++;
        }

        return self::$counter;
    }
}


1			<?php
2
3			/*
4			* The RandomLib library for securely generating random numbers and strings in PHP
5			*
6			* @author Anthony Ferrara <[email protected]>
7			* @copyright 2011 The Authors
8			* @license http://www.opensource.org/licenses/mit-license.html MIT License
9			* @version Build @@version@@
10			*/
11
12			/**
13			* The Microtime Random Number Source
14			*
15			* This uses the current micro-second (looped several times) for a very weak
16			* random number source. This is only useful when combined with several other
17			* stronger sources
18			*
19			* PHP version 5.3
20			*
21			* @category PHPCryptLib
22			* @package Random
23			* @subpackage Source
24			*
25			* @author Anthony Ferrara <[email protected]>
26			* @copyright 2011 The Authors
27			* @license http://www.opensource.org/licenses/mit-license.html MIT License
28			*
29			* @version Build @@version@@
30			*/
31			namespace RandomLib\Source;
32
33			use SecurityLib\Strength;
34			use SecurityLib\Util;
35
36			/**
37			* The Microtime Random Number Source
38			*
39			* This uses the current micro-second (looped several times) for a very weak
40			* random number source. This is only useful when combined with several other
41			* stronger sources
42			*
43			* @category PHPCryptLib
44			* @package Random
45			* @subpackage Source
46			*
47			* @author Anthony Ferrara <[email protected]>
48			* @codeCoverageIgnore
49			*/
50			final class MicroTime extends \RandomLib\AbstractSource
51			{
52
53			/**
54			* A static counter to ensure unique hashes and prevent state collisions
55			*
56			* @var int A counter
57			*/
58			private static $counter = null;
59
60			/**
61			* The current state of the random number generator.
62			*
63			* @var string The state of the PRNG
64			*/
65			private static $state = '';
66
67			public function __construct()
			0 ignored issues – show Coding Style introduced 2016-09-07 15:20 UTC by Report Bug Copy Issue Report `__construct` uses the super-global variable `$_ENV` which is generally not recommended. Instead of super-globals, we recommend to explicitly inject the dependencies of your class. This makes your code less dependent on global state and it becomes generally more testable: // Bad class Router { public function generate($path) { return $_SERVER['HOST'].$path; } } // Better class Router { private $host; public function __construct($host) { $this->host = $host; } public function generate($path) { return $this->host.$path; } } class Controller { public function myAction(Request $request) { // Instead of $page = isset($_GET['page']) ? intval($_GET['page']) : 1; // Better (assuming you use the Symfony2 request) $page = $request->query->get('page', 1); } } Loading history... Coding Style introduced 2016-09-07 15:20 UTC by Report Bug Copy Issue Report `__construct` uses the super-global variable `$_SERVER` which is generally not recommended. Instead of super-globals, we recommend to explicitly inject the dependencies of your class. This makes your code less dependent on global state and it becomes generally more testable: // Bad class Router { public function generate($path) { return $_SERVER['HOST'].$path; } } // Better class Router { private $host; public function __construct($host) { $this->host = $host; } public function generate($path) { return $this->host.$path; } } class Controller { public function myAction(Request $request) { // Instead of $page = isset($_GET['page']) ? intval($_GET['page']) : 1; // Better (assuming you use the Symfony2 request) $page = $request->query->get('page', 1); } } Loading history...
68			{
69			$state = self::$state;
70			if (function_exists('posix_times')) {
71			$state .= serialize(posix_times());
72			}
73			if (!defined('HHVM_VERSION') && function_exists('zend_thread_id')) {
74			$state .= zend_thread_id();
75			}
76			if (function_exists('hphp_get_thread_id')) {
77			$state .= hphp_get_thread_id();
78			}
79			$state .= getmypid() . memory_get_usage();
80			$state .= serialize($_ENV);
81			$state .= serialize($_SERVER);
82			$state .= count(debug_backtrace(false));
83			self::$state = hash('sha512', $state, true);
84			if (is_null(self::$counter)) {
85			list(, self::$counter) = unpack("i", Util::safeSubstr(self::$state, 0, 4));
86			$seed = $this->generate(Util::safeStrlen(dechex(PHP_INT_MAX)));
87			list(, self::$counter) = unpack("i", $seed);
88			}
89			}
90
91			/**
92			* Generate a random string of the specified size
93			*
94			* @param int $size The size of the requested random string
95			*
96			* @return string A string of the requested size
97			*/
98			public function generate($size)
99			{
100			$result = '';
101			$seed = microtime() . memory_get_usage();
102			self::$state = hash('sha512', self::$state . $seed, true);
103			/**
104			* Make the generated randomness a bit better by forcing a GC run which
105			* should complete in a indeterminate amount of time, hence improving
106			* the strength of the randomness a bit. It's still not crypto-safe,
107			* but at least it's more difficult to predict.
108			*/
109			gc_collect_cycles();
110			for ($i = 0; $i < $size; $i += 8) {
111			$seed = self::$state .
112			microtime() .
113			pack('Ni', $i, self::counter());
114			self::$state = hash('sha512', $seed, true);
115			/**
116			* We only use the first 8 bytes here to prevent exposing the state
117			* in its entirety, which could potentially expose other random
118			* generations in the future (in the same process)...
119			*/
120			$result .= Util::safeSubstr(self::$state, 0, 8);
121			}
122
123			return Util::safeSubstr($result, 0, $size);
124			}
125
126			private static function counter()
127			{
128			if (self::$counter >= PHP_INT_MAX) {
129			self::$counter = -1 * PHP_INT_MAX - 1;
130			} else {
131			self::$counter++;
132			}
133
134			return self::$counter;
135			}
136			}
137

ircmaxell / RandomLib

MicroTime::generate() B last analyzed 2016-09-07 16:00 UTC

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MicroTime::generate() B
last analyzed 2016-09-07 16:00 UTC