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[OS/Crypto] Add get_entropy to OS.

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Implemented via `BCryptGenRandom` on Windows.
Implemented via `getentropy` syscall when available.
Implemented via `/dev/urandom` device as a fallback.

The `/dev/urandom` fallback can be disabled via the `NO_URANDOM` build
flag.

Note: The HTML5 version relies on emscripten file system urandom
device which itself uses the Crypto API when available or the plain
old not crypto-safe `Math.random()` otherwise.

Restore get_entropy.
This commit is contained in:
Fabio Alessandrelli
2022-02-07 17:33:55 +01:00
parent 8317753c24
commit 6b5634b96a
5 changed files with 52 additions and 10 deletions
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11
drivers/unix/os_unix.h
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@@ -43,7 +43,6 @@ protected:
virtual void initialize_core();
virtual int unix_initialize_audio(int p_audio_driver);
//virtual Error initialize(int p_video_driver,int p_audio_driver);
virtual void finalize_core() override;
@@ -54,15 +53,7 @@ public:
virtual String get_stdin_string(bool p_block) override;
//virtual void set_mouse_show(bool p_show);
//virtual void set_mouse_grab(bool p_grab);
//virtual bool is_mouse_grab_enabled() const = 0;
//virtual void get_mouse_position(int &x, int &y) const;
//virtual void set_window_title(const String& p_title);
//virtual void set_video_mode(const VideoMode& p_video_mode);
//virtual VideoMode get_video_mode() const;
//virtual void get_fullscreen_mode_list(List<VideoMode> *p_list) const;
virtual Error get_entropy(uint8_t *r_buffer, int p_bytes) override; // Should return cryptographycally-safe random bytes.
virtual Error open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path = false) override;
virtual Error close_dynamic_library(void *p_library_handle) override;