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<?php /** * Random_* Compatibility Library * for using the new PHP 7 random_* API in PHP 5 projects * * The MIT License (MIT) * * Copyright (c) 2015 - 2017 Paragon Initiative Enterprises * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission 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. */ if (!is_callable('random_bytes')) { /** * If the libsodium PHP extension is loaded, we'll use it above any other * solution. * * libsodium-php project: * @ref https://github.com/jedisct1/libsodium-php * * @param int $bytes * * @throws Exception * * @return string */ function random_bytes($bytes) { try { $bytes = RandomCompat_intval($bytes); } catch (TypeError $ex) { throw new TypeError( 'random_bytes(): $bytes must be an integer' ); } if ($bytes < 1) { throw new Error( 'Length must be greater than 0' ); } /** * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be * generated in one invocation. */ if ($bytes > 2147483647) { $buf = ''; for ($i = 0; $i < $bytes; $i += 1073741824) { $n = ($bytes - $i) > 1073741824 ? 1073741824 : $bytes - $i; $buf .= \Sodium\randombytes_buf($n); } } else { $buf = \Sodium\randombytes_buf($bytes); } if ($buf !== false) { if (RandomCompat_strlen($buf) === $bytes) { return $buf; } } /** * If we reach here, PHP has failed us. */ throw new Exception( 'Could not gather sufficient random data' ); } }
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