<?php

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if (PHP_VERSION_ID < 70000) {

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if (!is_callable('sodiumCompatAutoloader')) {

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/**

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* Sodium_Compat autoloader.

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*

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* @param string $class Class name to be autoloaded.

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*

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* @return bool Stop autoloading?

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*/

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function sodiumCompatAutoloader($class)

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{

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$namespace = 'ParagonIE_Sodium_';

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// Does the class use the namespace prefix?

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$len = strlen($namespace);

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if (strncmp($namespace, $class, $len) !== 0) {

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// no, move to the next registered autoloader

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return false;

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}

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// Get the relative class name

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$relative_class = substr($class, $len);

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// Replace the namespace prefix with the base directory, replace namespace

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// separators with directory separators in the relative class name, append

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// with .php

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$file = dirname(__FILE__) . '/src/' . str_replace('_', '/', $relative_class) . '.php';

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// if the file exists, require it

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if (file_exists($file)) {

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require_once $file;

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return true;

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}

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return false;

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}

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// Now that we have an autoloader, let's register it!

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spl_autoload_register('sodiumCompatAutoloader');

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}

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} else {

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require_once dirname(__FILE__) . '/autoload-php7.php';

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}

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/* Explicitly, always load the Compat class: */

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require_once dirname(__FILE__) . '/src/Compat.php';

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if (!class_exists('SodiumException', false)) {

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require_once dirname(__FILE__) . '/src/SodiumException.php';

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}

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if (PHP_VERSION_ID >= 50300) {

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// Namespaces didn't exist before 5.3.0, so don't even try to use this

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// unless PHP >= 5.3.0

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require_once dirname(__FILE__) . '/lib/namespaced.php';

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require_once dirname(__FILE__) . '/lib/sodium_compat.php';

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} else {

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require_once dirname(__FILE__) . '/src/PHP52/SplFixedArray.php';

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}

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if (PHP_VERSION_ID < 70200 || !extension_loaded('sodium')) {

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if (PHP_VERSION_ID >= 50300 && !defined('SODIUM_CRYPTO_SCALARMULT_BYTES')) {

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require_once dirname(__FILE__) . '/lib/php72compat_const.php';

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}

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if (PHP_VERSION_ID >= 70000) {

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assert(class_exists('ParagonIE_Sodium_Compat'), 'Possible filesystem/autoloader bug?');

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} else {

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assert(class_exists('ParagonIE_Sodium_Compat'));

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}

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require_once(dirname(__FILE__) . '/lib/php72compat.php');

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} elseif (!function_exists('sodium_crypto_stream_xchacha20_xor')) {

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// Older versions of {PHP, ext/sodium} will not define these

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require_once(dirname(__FILE__) . '/lib/php72compat.php');

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}

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require_once(dirname(__FILE__) . '/lib/ristretto255.php');

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