增加请求加密和响应解密，与杏聆荟健康平台的rpc库保持一致

lib/client_base.dart

@@ -80,6 +80,10 @@ class JsonRpcClientBase {
 
       String package = jsonEncode(req.toJson());
 
+      if (requestEncryptConfig.enable) {
+        package = _encryptRequestPackage(package);
+      }
+
       var response = await _postRequest(package);
       if (response == null) throw JsonRpcException(message: "Response Empty");
 
@@ -106,6 +110,15 @@ class JsonRpcClientBase {
         throw JsonRpcException(
             message: "Http error.Status coder: ${response.statusCode}.");
       }
+      if (response.headers.containsKey("response_encrypt_mode")) {
+        final resEncryptMode = response.headers["response_encrypt_mode"]!;
+        // 解密响应包
+        if (resEncryptMode.isNotEmpty && resEncryptMode.first.isNotEmpty) {
+          final resPackage = _decryptResponsePackage(response.data);
+          final resJsonMap = jsonDecode(resPackage);
+          return resJsonMap;
+        }
+      }
       return response.data;
     } on dio.DioError catch (e) {
       throw JsonRpcException(message: "Http error", data: e);
@@ -136,6 +149,44 @@ class JsonRpcClientBase {
     result = await jsonRpcInterceptHost.onResponseResult(result);
     return result;
   }
+
+  String _encryptRequestPackage(String package) {
+    final mode = requestEncryptConfig.encryptMode.toLowerCase();
+    if (kIsWeb) {
+      return package;
+    }
+    if (mode == "sm2") {
+      // 使用国密2加密请求
+      return JsonRpcEncryptUtils.sm2Encrypt(
+        package,
+        requestEncryptConfig.encryptKey,
+      );
+    }
+    if (mode == "rsa") {
+      // 使用RSA加密请求
+      return JsonRpcEncryptUtils.rsaEncrypt(package);
+    }
+    return package;
+  }
+
+  String _decryptResponsePackage(String package) {
+    final mode = responseEncryptConfig.encryptMode.toLowerCase();
+    if (mode == "sm4") {
+      // 使用国密4解密
+      return JsonRpcEncryptUtils.sm4Decrypt(
+        package,
+        responseEncryptConfig.encryptKey,
+      );
+    }
+    if (mode == "des") {
+      // 使用DES解密
+
+      // 截取前8位
+      final key = responseEncryptConfig.encryptKey.substring(0, 8);
+      return JsonRpcEncryptUtils.desDecrypt(package, key);
+    }
+    return package;
+  }
 }
 
 abstract class JsonRpcRequestModelBase {