diff --git a/app/http/middleware/ContextMiddleware.php b/app/http/middleware/ContextMiddleware.php
index dc92494..882342e 100644
--- a/app/http/middleware/ContextMiddleware.php
+++ b/app/http/middleware/ContextMiddleware.php
@@ -160,45 +160,48 @@ class ContextMiddleware extends middleware
      * @throws ValidateException 解密失败时抛出异常
      */
     private function  decryptCryptoJSData(string $encryptedData): array
-    {// 1. Base64 解码加密数据
-        $encrypted = base64_decode($encryptedData);
+    {
+        // Base64解码
+        $data = base64_decode($encryptedData);
 
-        // 2. 提取初始化向量 (IV) - 前16字节
-        if (strlen($encrypted) < 16) {
-            throw new ValidateException('加密数据太短，无法提取IV');
+        // 检查Salted__头
+        if (!str_starts_with($data, "Salted__")) {
+            throw new ValidateException('Invalid format: missing "Salted__" header');
         }
 
-        $iv = substr($encrypted, 0, 16);
-        $ciphertext = substr($encrypted, 16);
+        // 提取Salt (8字节)
+        $salt = substr($data, 8, 8);
+        $ct = substr($data, 16);
 
-        // 3. 准备解密密钥
-        // CryptoJS 使用密钥派生函数，这里使用简单的 SHA256 哈希
-        $key = substr(hash('sha256', self::DATA_SECRET_KEY, true), 0, 32);
+        // 通过EVP_BytesToKey派生密钥和IV
+        $keyIv = $this->evpBytesToKey($salt);
+        $key = $keyIv['key'];
+        $iv = $keyIv['iv'];
 
-        // 4. 使用 AES-256-CBC 解密
+        // AES-256-CBC解密
         $decrypted = openssl_decrypt(
-            $ciphertext,
-            'AES-256-CBC',
+            $ct,
+            'aes-256-cbc',
             $key,
             OPENSSL_RAW_DATA,
             $iv
         );
+        return json_decode($decrypted, true);
+    }
 
-        if ($decrypted === false) {
-            throw new ValidateException('解密失败: ' . openssl_error_string());
+   private function evpBytesToKey($salt): array
+   {
+        $password = self::DATA_SECRET_KEY;
+        $bytes = '';
+        $last = '';
+        // 生成48字节：32字节key + 16字节IV
+        while(strlen($bytes) < 48) {
+            $last = md5($last . $password . $salt, true);
+            $bytes .= $last;
         }
-
-        // 5. 移除 PKCS#7 填充
-        $padding = ord($decrypted[strlen($decrypted) - 1]);
-        $decrypted = substr($decrypted, 0, -$padding);
-
-        // 6. 解析为 JSON
-        $data = json_decode($decrypted, true);
-
-        if (json_last_error() !== JSON_ERROR_NONE) {
-            throw new ValidateException('JSON 解析失败: ' . json_last_error_msg());
-        }
-
-        return $data;
+        return [
+            'key' => substr($bytes, 0, 32),
+            'iv'  => substr($bytes, 32, 16)
+        ];
     }
 }
\ No newline at end of file