From 43de9af71f7f4ca5731b94a06d688ae8412ba427 Mon Sep 17 00:00:00 2001
From: M.Gergo
Date: Fri, 6 Jul 2018 11:14:41 +0200
Subject: 2018/Feb/28 -i állapot hozzáadva, mint a módosítások kiindulási
 állapota

---
 .../McryptPseudoRandomStringGenerator.php          |  68 ++++++++++++++
 .../OpenSslPseudoRandomStringGenerator.php         |  67 ++++++++++++++
 .../PseudoRandomStringGeneratorFactory.php         | 101 +++++++++++++++++++++
 .../PseudoRandomStringGeneratorInterface.php       |  45 +++++++++
 .../PseudoRandomStringGeneratorTrait.php           |  58 ++++++++++++
 .../RandomBytesPseudoRandomStringGenerator.php     |  59 ++++++++++++
 .../UrandomPseudoRandomStringGenerator.php         |  89 ++++++++++++++++++
 7 files changed, 487 insertions(+)
 create mode 100644 mayor-orig/www/include/share/facebook/PseudoRandomString/McryptPseudoRandomStringGenerator.php
 create mode 100644 mayor-orig/www/include/share/facebook/PseudoRandomString/OpenSslPseudoRandomStringGenerator.php
 create mode 100644 mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorFactory.php
 create mode 100644 mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorInterface.php
 create mode 100644 mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php
 create mode 100644 mayor-orig/www/include/share/facebook/PseudoRandomString/RandomBytesPseudoRandomStringGenerator.php
 create mode 100644 mayor-orig/www/include/share/facebook/PseudoRandomString/UrandomPseudoRandomStringGenerator.php

(limited to 'mayor-orig/www/include/share/facebook/PseudoRandomString')

diff --git a/mayor-orig/www/include/share/facebook/PseudoRandomString/McryptPseudoRandomStringGenerator.php b/mayor-orig/www/include/share/facebook/PseudoRandomString/McryptPseudoRandomStringGenerator.php
new file mode 100644
index 00000000..bf573745
--- /dev/null
+++ b/mayor-orig/www/include/share/facebook/PseudoRandomString/McryptPseudoRandomStringGenerator.php
@@ -0,0 +1,68 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PseudoRandomString;
+
+use Facebook\Exceptions\FacebookSDKException;
+
+class McryptPseudoRandomStringGenerator implements PseudoRandomStringGeneratorInterface
+{
+    use PseudoRandomStringGeneratorTrait;
+
+    /**
+     * @const string The error message when generating the string fails.
+     */
+    const ERROR_MESSAGE = 'Unable to generate a cryptographically secure pseudo-random string from mcrypt_create_iv(). ';
+
+    /**
+     * @throws FacebookSDKException
+     */
+    public function __construct()
+    {
+        if (!function_exists('mcrypt_create_iv')) {
+            throw new FacebookSDKException(
+                static::ERROR_MESSAGE .
+                'The function mcrypt_create_iv() does not exist.'
+            );
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPseudoRandomString($length)
+    {
+        $this->validateLength($length);
+
+        $binaryString = mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
+
+        if ($binaryString === false) {
+            throw new FacebookSDKException(
+                static::ERROR_MESSAGE .
+                'mcrypt_create_iv() returned an error.'
+            );
+        }
+
+        return $this->binToHex($binaryString, $length);
+    }
+}
diff --git a/mayor-orig/www/include/share/facebook/PseudoRandomString/OpenSslPseudoRandomStringGenerator.php b/mayor-orig/www/include/share/facebook/PseudoRandomString/OpenSslPseudoRandomStringGenerator.php
new file mode 100644
index 00000000..4b4276dc
--- /dev/null
+++ b/mayor-orig/www/include/share/facebook/PseudoRandomString/OpenSslPseudoRandomStringGenerator.php
@@ -0,0 +1,67 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PseudoRandomString;
+
+use Facebook\Exceptions\FacebookSDKException;
+
+class OpenSslPseudoRandomStringGenerator implements PseudoRandomStringGeneratorInterface
+{
+    use PseudoRandomStringGeneratorTrait;
+
+    /**
+     * @const string The error message when generating the string fails.
+     */
+    const ERROR_MESSAGE = 'Unable to generate a cryptographically secure pseudo-random string from openssl_random_pseudo_bytes().';
+
+    /**
+     * @throws FacebookSDKException
+     */
+    public function __construct()
+    {
+        if (!function_exists('openssl_random_pseudo_bytes')) {
+            throw new FacebookSDKException(static::ERROR_MESSAGE . 'The function openssl_random_pseudo_bytes() does not exist.');
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPseudoRandomString($length)
+    {
+        $this->validateLength($length);
+
+        $wasCryptographicallyStrong = false;
+        $binaryString = openssl_random_pseudo_bytes($length, $wasCryptographicallyStrong);
+
+        if ($binaryString === false) {
+            throw new FacebookSDKException(static::ERROR_MESSAGE . 'openssl_random_pseudo_bytes() returned an unknown error.');
+        }
+
+        if ($wasCryptographicallyStrong !== true) {
+            throw new FacebookSDKException(static::ERROR_MESSAGE . 'openssl_random_pseudo_bytes() returned a pseudo-random string but it was not cryptographically secure and cannot be used.');
+        }
+
+        return $this->binToHex($binaryString, $length);
+    }
+}
diff --git a/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorFactory.php b/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorFactory.php
new file mode 100644
index 00000000..412f4813
--- /dev/null
+++ b/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorFactory.php
@@ -0,0 +1,101 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PseudoRandomString;
+
+use Facebook\Exceptions\FacebookSDKException;
+use InvalidArgumentException;
+
+class PseudoRandomStringGeneratorFactory
+{
+    private function __construct()
+    {
+        // a factory constructor should never be invoked
+    }
+
+    /**
+     * Pseudo random string generator creation.
+     *
+     * @param PseudoRandomStringGeneratorInterface|string|null $generator
+     *
+     * @throws InvalidArgumentException If the pseudo random string generator must be set to "random_bytes", "mcrypt", "openssl", or "urandom", or be an instance of Facebook\PseudoRandomString\PseudoRandomStringGeneratorInterface.
+     *
+     * @return PseudoRandomStringGeneratorInterface
+     */
+    public static function createPseudoRandomStringGenerator($generator)
+    {
+        if (!$generator) {
+            return self::detectDefaultPseudoRandomStringGenerator();
+        }
+
+        if ($generator instanceof PseudoRandomStringGeneratorInterface) {
+            return $generator;
+        }
+
+        if ('random_bytes' === $generator) {
+            return new RandomBytesPseudoRandomStringGenerator();
+        }
+        if ('mcrypt' === $generator) {
+            return new McryptPseudoRandomStringGenerator();
+        }
+        if ('openssl' === $generator) {
+            return new OpenSslPseudoRandomStringGenerator();
+        }
+        if ('urandom' === $generator) {
+            return new UrandomPseudoRandomStringGenerator();
+        }
+
+        throw new InvalidArgumentException('The pseudo random string generator must be set to "random_bytes", "mcrypt", "openssl", or "urandom", or be an instance of Facebook\PseudoRandomString\PseudoRandomStringGeneratorInterface');
+    }
+
+    /**
+     * Detects which pseudo-random string generator to use.
+     *
+     * @throws FacebookSDKException If unable to detect a cryptographically secure pseudo-random string generator.
+     *
+     * @return PseudoRandomStringGeneratorInterface
+     */
+    private static function detectDefaultPseudoRandomStringGenerator()
+    {
+        // Check for PHP 7's CSPRNG first to keep mcrypt deprecation messages from appearing in PHP 7.1.
+        if (function_exists('random_bytes')) {
+            return new RandomBytesPseudoRandomStringGenerator();
+        }
+
+        // Since openssl_random_pseudo_bytes() can sometimes return non-cryptographically
+        // secure pseudo-random strings (in rare cases), we check for mcrypt_create_iv() next.
+        if (function_exists('mcrypt_create_iv')) {
+            return new McryptPseudoRandomStringGenerator();
+        }
+
+        if (function_exists('openssl_random_pseudo_bytes')) {
+            return new OpenSslPseudoRandomStringGenerator();
+        }
+
+        if (!ini_get('open_basedir') && is_readable('/dev/urandom')) {
+            return new UrandomPseudoRandomStringGenerator();
+        }
+
+        throw new FacebookSDKException('Unable to detect a cryptographically secure pseudo-random string generator.');
+    }
+}
diff --git a/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorInterface.php b/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorInterface.php
new file mode 100644
index 00000000..914ee3cf
--- /dev/null
+++ b/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorInterface.php
@@ -0,0 +1,45 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PseudoRandomString;
+
+/**
+ * Interface
+ *
+ * @package Facebook
+ */
+interface PseudoRandomStringGeneratorInterface
+{
+    /**
+     * Get a cryptographically secure pseudo-random string of arbitrary length.
+     *
+     * @see http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers/
+     *
+     * @param int $length The length of the string to return.
+     *
+     * @return string
+     *
+     * @throws \Facebook\Exceptions\FacebookSDKException|\InvalidArgumentException
+     */
+    public function getPseudoRandomString($length);
+}
diff --git a/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php b/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php
new file mode 100644
index 00000000..0f587ea2
--- /dev/null
+++ b/mayor-orig/www/include/share/facebook/PseudoRandomString/PseudoRandomStringGeneratorTrait.php
@@ -0,0 +1,58 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PseudoRandomString;
+
+trait PseudoRandomStringGeneratorTrait
+{
+    /**
+     * Validates the length argument of a random string.
+     *
+     * @param int $length The length to validate.
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function validateLength($length)
+    {
+        if (!is_int($length)) {
+            throw new \InvalidArgumentException('getPseudoRandomString() expects an integer for the string length');
+        }
+
+        if ($length < 1) {
+            throw new \InvalidArgumentException('getPseudoRandomString() expects a length greater than 1');
+        }
+    }
+
+    /**
+     * Converts binary data to hexadecimal of arbitrary length.
+     *
+     * @param string $binaryData The binary data to convert to hex.
+     * @param int    $length     The length of the string to return.
+     *
+     * @return string
+     */
+    public function binToHex($binaryData, $length)
+    {
+        return \substr(\bin2hex($binaryData), 0, $length);
+    }
+}
diff --git a/mayor-orig/www/include/share/facebook/PseudoRandomString/RandomBytesPseudoRandomStringGenerator.php b/mayor-orig/www/include/share/facebook/PseudoRandomString/RandomBytesPseudoRandomStringGenerator.php
new file mode 100644
index 00000000..b5943f6f
--- /dev/null
+++ b/mayor-orig/www/include/share/facebook/PseudoRandomString/RandomBytesPseudoRandomStringGenerator.php
@@ -0,0 +1,59 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PseudoRandomString;
+
+use Facebook\Exceptions\FacebookSDKException;
+
+class RandomBytesPseudoRandomStringGenerator implements PseudoRandomStringGeneratorInterface
+{
+    use PseudoRandomStringGeneratorTrait;
+
+    /**
+     * @const string The error message when generating the string fails.
+     */
+    const ERROR_MESSAGE = 'Unable to generate a cryptographically secure pseudo-random string from random_bytes(). ';
+
+    /**
+     * @throws FacebookSDKException
+     */
+    public function __construct()
+    {
+        if (!function_exists('random_bytes')) {
+            throw new FacebookSDKException(
+                static::ERROR_MESSAGE .
+                'The function random_bytes() does not exist.'
+            );
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPseudoRandomString($length)
+    {
+        $this->validateLength($length);
+
+        return $this->binToHex(random_bytes($length), $length);
+    }
+}
diff --git a/mayor-orig/www/include/share/facebook/PseudoRandomString/UrandomPseudoRandomStringGenerator.php b/mayor-orig/www/include/share/facebook/PseudoRandomString/UrandomPseudoRandomStringGenerator.php
new file mode 100644
index 00000000..5ab434e6
--- /dev/null
+++ b/mayor-orig/www/include/share/facebook/PseudoRandomString/UrandomPseudoRandomStringGenerator.php
@@ -0,0 +1,89 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PseudoRandomString;
+
+use Facebook\Exceptions\FacebookSDKException;
+
+class UrandomPseudoRandomStringGenerator implements PseudoRandomStringGeneratorInterface
+{
+
+    use PseudoRandomStringGeneratorTrait;
+
+    /**
+     * @const string The error message when generating the string fails.
+     */
+    const ERROR_MESSAGE = 'Unable to generate a cryptographically secure pseudo-random string from /dev/urandom. ';
+
+    /**
+     * @throws FacebookSDKException
+     */
+    public function __construct()
+    {
+        if (ini_get('open_basedir')) {
+            throw new FacebookSDKException(
+                static::ERROR_MESSAGE .
+                'There is an open_basedir constraint that prevents access to /dev/urandom.'
+            );
+        }
+
+        if (!is_readable('/dev/urandom')) {
+            throw new FacebookSDKException(
+                static::ERROR_MESSAGE .
+                'Unable to read from /dev/urandom.'
+            );
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPseudoRandomString($length)
+    {
+        $this->validateLength($length);
+
+        $stream = fopen('/dev/urandom', 'rb');
+        if (!is_resource($stream)) {
+            throw new FacebookSDKException(
+                static::ERROR_MESSAGE .
+                'Unable to open stream to /dev/urandom.'
+            );
+        }
+
+        if (!defined('HHVM_VERSION')) {
+            stream_set_read_buffer($stream, 0);
+        }
+
+        $binaryString = fread($stream, $length);
+        fclose($stream);
+
+        if (!$binaryString) {
+            throw new FacebookSDKException(
+                static::ERROR_MESSAGE .
+                'Stream to /dev/urandom returned no data.'
+            );
+        }
+
+        return $this->binToHex($binaryString, $length);
+    }
+}
-- 
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