From fd2bc4ce1866aedf684bebf29e9e9c543a9dfbe7 Mon Sep 17 00:00:00 2001
From: Dean Lee <deanlee3@gmail.com>
Date: Thu, 28 Oct 2021 12:12:00 +0800
Subject: [PATCH] Qt/CommaApi: cache private key (#22715)

* cache private key

* space

* no need to check mtime

* call_once

* simplify
old-commit-hash: 3f4cc9a246e2a244e219f9766cd0edec93a54e26
---
 selfdrive/ui/qt/api.cc | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/selfdrive/ui/qt/api.cc b/selfdrive/ui/qt/api.cc
index 0c344056ff..af959e6cd9 100644
--- a/selfdrive/ui/qt/api.cc
+++ b/selfdrive/ui/qt/api.cc
@@ -19,14 +19,12 @@
 namespace CommaApi {
 
 QByteArray rsa_sign(const QByteArray &data) {
-  auto file = QFile(Path::rsa_file().c_str());
-  if (!file.open(QIODevice::ReadOnly)) {
+  static std::string key = util::read_file(Path::rsa_file());
+  if (key.empty()) {
     qDebug() << "No RSA private key found, please run manager.py or registration.py";
-    return QByteArray();
+    return {};
   }
-  auto key = file.readAll();
-  file.close();
-  file.deleteLater();
+
   BIO* mem = BIO_new_mem_buf(key.data(), key.size());
   assert(mem);
   RSA* rsa_private = PEM_read_bio_RSAPrivateKey(mem, NULL, NULL, NULL);