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vendor/overtrue/wechat/src/Kernel/Support/AES.php

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+<?php
+
+/*
+ * This file is part of the overtrue/wechat.
+ *
+ * (c) overtrue <i@overtrue.me>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace EasyWeChat\Kernel\Support;
+
+/**
+ * Class AES.
+ *
+ * @author overtrue <i@overtrue.me>
+ */
+class AES
+{
+    /**
+     * @param string $text
+     * @param string $key
+     * @param string $iv
+     * @param int    $option
+     *
+     * @return string
+     */
+    public static function encrypt(string $text, string $key, string $iv, int $option = OPENSSL_RAW_DATA): string
+    {
+        self::validateKey($key);
+        self::validateIv($iv);
+
+        return openssl_encrypt($text, self::getMode($key), $key, $option, $iv);
+    }
+
+    /**
+     * @param string      $cipherText
+     * @param string      $key
+     * @param string      $iv
+     * @param int         $option
+     * @param string|null $method
+     *
+     * @return string
+     */
+    public static function decrypt(string $cipherText, string $key, string $iv, int $option = OPENSSL_RAW_DATA, $method = null): string
+    {
+        self::validateKey($key);
+        self::validateIv($iv);
+
+        return openssl_decrypt($cipherText, $method ?: self::getMode($key), $key, $option, $iv);
+    }
+
+    /**
+     * @param string $key
+     *
+     * @return string
+     */
+    public static function getMode($key)
+    {
+        return 'aes-'.(8 * strlen($key)).'-cbc';
+    }
+
+    /**
+     * @param string $key
+     */
+    public static function validateKey(string $key)
+    {
+        if (!in_array(strlen($key), [16, 24, 32], true)) {
+            throw new \InvalidArgumentException(sprintf('Key length must be 16, 24, or 32 bytes; got key len (%s).', strlen($key)));
+        }
+    }
+
+    /**
+     * @param string $iv
+     *
+     * @throws \InvalidArgumentException
+     */
+    public static function validateIv(string $iv)
+    {
+        if (!empty($iv) && 16 !== strlen($iv)) {
+            throw new \InvalidArgumentException('IV length must be 16 bytes.');
+        }
+    }
+}