2 * Noise generation for PuTTY's cryptographic random number
13 * GetSystemPowerStatus function.
15 typedef BOOL(WINAPI
* gsps_t
) (LPSYSTEM_POWER_STATUS
);
19 * This function is called once, at PuTTY startup, and will do some
20 * seriously silly things like listing directories and getting disk
21 * free space and a process snapshot.
24 void noise_get_heavy(void (*func
) (void *, int))
27 WIN32_FIND_DATA finddata
;
28 char winpath
[MAX_PATH
+ 3];
31 GetWindowsDirectory(winpath
, sizeof(winpath
));
32 strcat(winpath
, "\\*");
33 srch
= FindFirstFile(winpath
, &finddata
);
34 if (srch
!= INVALID_HANDLE_VALUE
) {
36 func(&finddata
, sizeof(finddata
));
37 } while (FindNextFile(srch
, &finddata
));
41 read_random_seed(func
);
42 /* Update the seed immediately, in case another instance uses it. */
46 mod
= GetModuleHandle("KERNEL32");
48 gsps
= (gsps_t
) GetProcAddress(mod
, "GetSystemPowerStatus");
52 void random_save_seed(void)
58 random_get_savedata(&data
, &len
);
59 write_random_seed(data
, len
);
65 * This function is called every time the random pool needs
66 * stirring, and will acquire the system time in all available
67 * forms and the battery status.
69 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 a timer, and it will monitor
93 * frequently changing quantities such as the state of physical and
94 * virtual memory, the state of the process's message queue, which
95 * window is in the foreground, which owns the clipboard, etc.
97 void noise_regular(void)
102 MEMORYSTATUS memstat
;
105 w
= GetForegroundWindow();
106 random_add_noise(&w
, sizeof(w
));
108 random_add_noise(&w
, sizeof(w
));
109 w
= GetClipboardOwner();
110 random_add_noise(&w
, sizeof(w
));
111 z
= GetQueueStatus(QS_ALLEVENTS
);
112 random_add_noise(&z
, sizeof(z
));
115 random_add_noise(&pt
, sizeof(pt
));
117 GlobalMemoryStatus(&memstat
);
118 random_add_noise(&memstat
, sizeof(memstat
));
120 GetThreadTimes(GetCurrentThread(), times
, times
+ 1, times
+ 2,
122 random_add_noise(×
, sizeof(times
));
123 GetProcessTimes(GetCurrentProcess(), times
, times
+ 1, times
+ 2,
125 random_add_noise(×
, sizeof(times
));
129 * This function is called on every keypress or mouse move, and
130 * will add the current Windows time and performance monitor
131 * counter to the noise pool. It gets the scan code or mouse
132 * position passed in.
134 void noise_ultralight(unsigned long data
)
137 LARGE_INTEGER perftime
;
139 random_add_noise(&data
, sizeof(DWORD
));
141 wintime
= GetTickCount();
142 random_add_noise(&wintime
, sizeof(DWORD
));
144 if (QueryPerformanceCounter(&perftime
))
145 random_add_noise(&perftime
, sizeof(perftime
));