2 * Noise generation for PuTTY's cryptographic random number
21 * GetSystemPowerStatus function.
23 typedef BOOL (WINAPI
*gsps_t
)(LPSYSTEM_POWER_STATUS
);
27 * This function is called once, at PuTTY startup, and will do some
28 * seriously silly things like listing directories and getting disk
29 * free space and a process snapshot.
32 void noise_get_heavy(void (*func
) (void *, int)) {
34 WIN32_FIND_DATA finddata
;
35 char winpath
[MAX_PATH
+3];
38 GetWindowsDirectory(winpath
, sizeof(winpath
));
39 strcat(winpath
, "\\*");
40 srch
= FindFirstFile(winpath
, &finddata
);
41 if (srch
!= INVALID_HANDLE_VALUE
) {
43 func(&finddata
, sizeof(finddata
));
44 } while (FindNextFile(srch
, &finddata
));
48 read_random_seed(func
);
51 mod
= GetModuleHandle("KERNEL32");
53 gsps
= (gsps_t
)GetProcAddress(mod
, "GetSystemPowerStatus");
57 void random_save_seed(void) {
61 random_get_savedata(&data
, &len
);
62 write_random_seed(data
, len
);
66 * This function is called every time the random pool needs
67 * stirring, and will acquire the system time in all available
68 * forms and the battery status.
70 void noise_get_light(void (*func
) (void *, int)) {
74 SYSTEM_POWER_STATUS pwrstat
;
76 GetSystemTime(&systime
);
77 func(&systime
, sizeof(systime
));
79 GetSystemTimeAdjustment(&adjust
[0], &adjust
[1], &rubbish
);
80 func(&adjust
, sizeof(adjust
));
83 * Call GetSystemPowerStatus if present.
87 func(&pwrstat
, sizeof(pwrstat
));
92 * This function is called on every keypress or mouse move, and
93 * will add the current Windows time and performance monitor
94 * counter to the noise pool. It gets the scan code or mouse
97 void noise_ultralight(DWORD data
) {
99 LARGE_INTEGER perftime
;
101 random_add_noise(&data
, sizeof(DWORD
));
103 wintime
= GetTickCount();
104 random_add_noise(&wintime
, sizeof(DWORD
));
106 if (QueryPerformanceCounter(&perftime
))
107 random_add_noise(&perftime
, sizeof(perftime
));