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vendor/nelexa/zip/src/Util/CryptoUtil.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the nelexa/zip package.
+ * (c) Ne-Lexa <https://github.com/Ne-Lexa/php-zip>
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace PhpZip\Util;
+
+use PhpZip\Exception\RuntimeException;
+
+/**
+ * Crypto Utils.
+ *
+ * @internal
+ */
+final class CryptoUtil
+{
+    /**
+     * Decrypt AES-CTR.
+     *
+     * @param string $data Encrypted data
+     * @param string $key  Aes key
+     * @param string $iv   Aes IV
+     *
+     * @return string Raw data
+     */
+    public static function decryptAesCtr(string $data, string $key, string $iv): string
+    {
+        if (\extension_loaded('openssl')) {
+            $numBits = \strlen($key) * 8;
+            /** @noinspection PhpComposerExtensionStubsInspection */
+            return openssl_decrypt($data, 'AES-' . $numBits . '-CTR', $key, \OPENSSL_RAW_DATA, $iv);
+        }
+
+        throw new RuntimeException('Openssl extension not loaded');
+    }
+
+    /**
+     * Encrypt AES-CTR.
+     *
+     * @param string $data Raw data
+     * @param string $key  Aes key
+     * @param string $iv   Aes IV
+     *
+     * @return string Encrypted data
+     */
+    public static function encryptAesCtr(string $data, string $key, string $iv): string
+    {
+        if (\extension_loaded('openssl')) {
+            $numBits = \strlen($key) * 8;
+            /** @noinspection PhpComposerExtensionStubsInspection */
+            return openssl_encrypt($data, 'AES-' . $numBits . '-CTR', $key, \OPENSSL_RAW_DATA, $iv);
+        }
+
+        throw new RuntimeException('Openssl extension not loaded');
+    }
+}