[feat] unify Windows unattended hosting and device identity

apps/desktop/src/common/credential_cache.h

@@ -0,0 +1,71 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-11-08
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _CREDENTIAL_CACHE_H_
+#define _CREDENTIAL_CACHE_H_
+
+#include <cstddef>
+#include <cstdint>
+
+namespace crossdesk::credential_cache {
+inline constexpr uint32_t kMagic = 0x33444358;
+inline constexpr uint32_t kVersion = 3;
+
+struct CacheV1 {
+  char client_id_with_password[17];
+  int language;
+  // Reserved legacy slots: retain the on-disk cache layout.
+  int legacy_video_quality;
+  int legacy_video_frame_rate;
+  int video_encode_format;
+  bool legacy_enable_hardware_video_codec;
+  bool enable_turn;
+  bool enable_srtp;
+  unsigned char key[16];
+  unsigned char iv[16];
+};
+
+struct CacheV2 {
+  char client_id_with_password[17];
+  int language;
+  // Reserved legacy slots: retain the on-disk cache layout.
+  int legacy_video_quality;
+  int legacy_video_frame_rate;
+  int video_encode_format;
+  bool legacy_enable_hardware_video_codec;
+  bool enable_turn;
+  bool enable_srtp;
+  unsigned char key[16];
+  unsigned char iv[16];
+  char self_hosted_id[17];
+};
+
+struct CacheV3 {
+  uint32_t magic;
+  uint32_t version;
+  CacheV2 base;
+  char pending_identity[17];
+  char pending_server_host[256];
+  int pending_server_port;
+  bool pending_self_hosted;
+  char pending_request_id[64];
+  uint32_t checksum;
+};
+
+
+inline uint32_t Checksum(const void* data, size_t size) {
+  const auto* bytes = static_cast<const unsigned char*>(data);
+  uint32_t hash = 2166136261u;
+  for (size_t i = 0; i < size; ++i) { hash ^= bytes[i]; hash *= 16777619u; }
+  return hash;
+}
+inline bool Valid(const CacheV3& cache) {
+  return cache.magic == kMagic && cache.version == kVersion &&
+      cache.checksum == Checksum(&cache, offsetof(CacheV3, checksum));
+}
+}  // namespace crossdesk::credential_cache
+
+#endif