2 * Noise generation for PuTTY's cryptographic random number
14 * GetSystemPowerStatus function.
16 typedef BOOL(WINAPI
* gsps_t
) (LPSYSTEM_POWER_STATUS
);
20 * This function is called once, at PuTTY startup, and will do some
21 * seriously silly things like listing directories and getting disk
22 * free space and a process snapshot.
25 void noise_get_heavy(void (*func
) (void *, int))
28 WIN32_FIND_DATA finddata
;
29 char winpath
[MAX_PATH
+ 3];
32 GetWindowsDirectory(winpath
, sizeof(winpath
));
33 strcat(winpath
, "\\*");
34 srch
= FindFirstFile(winpath
, &finddata
);
35 if (srch
!= INVALID_HANDLE_VALUE
) {
37 func(&finddata
, sizeof(finddata
));
38 } while (FindNextFile(srch
, &finddata
));
42 read_random_seed(func
);
45 mod
= GetModuleHandle("KERNEL32");
47 gsps
= (gsps_t
) GetProcAddress(mod
, "GetSystemPowerStatus");
51 void random_save_seed(void)
57 random_get_savedata(&data
, &len
);
58 write_random_seed(data
, len
);
63 * This function is called every time the random pool needs
64 * stirring, and will acquire the system time in all available
65 * forms and the battery status.
67 void noise_get_light(void (*func
) (void *, int))
72 SYSTEM_POWER_STATUS pwrstat
;
74 GetSystemTime(&systime
);
75 func(&systime
, sizeof(systime
));
77 GetSystemTimeAdjustment(&adjust
[0], &adjust
[1], &rubbish
);
78 func(&adjust
, sizeof(adjust
));
81 * Call GetSystemPowerStatus if present.
85 func(&pwrstat
, sizeof(pwrstat
));
90 * This function is called on a timer, and it will monitor
91 * frequently changing quantities such as the state of physical and
92 * virtual memory, the state of the process's message queue, which
93 * window is in the foreground, which owns the clipboard, etc.
95 void noise_regular(void)
100 MEMORYSTATUS memstat
;
103 w
= GetForegroundWindow();
104 random_add_noise(&w
, sizeof(w
));
106 random_add_noise(&w
, sizeof(w
));
107 w
= GetClipboardOwner();
108 random_add_noise(&w
, sizeof(w
));
109 z
= GetQueueStatus(QS_ALLEVENTS
);
110 random_add_noise(&z
, sizeof(z
));
113 random_add_noise(&pt
, sizeof(pt
));
115 GlobalMemoryStatus(&memstat
);
116 random_add_noise(&memstat
, sizeof(memstat
));
118 GetThreadTimes(GetCurrentThread(), times
, times
+ 1, times
+ 2,
120 random_add_noise(×
, sizeof(times
));
121 GetProcessTimes(GetCurrentProcess(), times
, times
+ 1, times
+ 2,
123 random_add_noise(×
, sizeof(times
));
127 * This function is called on every keypress or mouse move, and
128 * will add the current Windows time and performance monitor
129 * counter to the noise pool. It gets the scan code or mouse
130 * position passed in.
132 void noise_ultralight(DWORD data
)
135 LARGE_INTEGER perftime
;
137 random_add_noise(&data
, sizeof(DWORD
));
139 wintime
= GetTickCount();
140 random_add_noise(&wintime
, sizeof(DWORD
));
142 if (QueryPerformanceCounter(&perftime
))
143 random_add_noise(&perftime
, sizeof(perftime
));