2 * Noise generation for PuTTY's cryptographic random number
13 * This function is called once, at PuTTY startup, and will do some
14 * seriously silly things like listing directories and getting disk
15 * free space and a process snapshot.
18 void noise_get_heavy(void (*func
) (void *, int))
21 WIN32_FIND_DATA finddata
;
23 char winpath
[MAX_PATH
+ 3];
25 GetWindowsDirectory(winpath
, sizeof(winpath
));
26 strcat(winpath
, "\\*");
27 srch
= FindFirstFile(winpath
, &finddata
);
28 if (srch
!= INVALID_HANDLE_VALUE
) {
30 func(&finddata
, sizeof(finddata
));
31 } while (FindNextFile(srch
, &finddata
));
35 pid
= GetCurrentProcessId();
36 func(&pid
, sizeof(pid
));
38 read_random_seed(func
);
39 /* Update the seed immediately, in case another instance uses it. */
43 void random_save_seed(void)
49 random_get_savedata(&data
, &len
);
50 write_random_seed(data
, len
);
56 * This function is called every time the random pool needs
57 * stirring, and will acquire the system time in all available
60 void noise_get_light(void (*func
) (void *, int))
66 GetSystemTime(&systime
);
67 func(&systime
, sizeof(systime
));
69 GetSystemTimeAdjustment(&adjust
[0], &adjust
[1], &rubbish
);
70 func(&adjust
, sizeof(adjust
));
74 * This function is called on a timer, and it will monitor
75 * frequently changing quantities such as the state of physical and
76 * virtual memory, the state of the process's message queue, which
77 * window is in the foreground, which owns the clipboard, etc.
79 void noise_regular(void)
87 w
= GetForegroundWindow();
88 random_add_noise(&w
, sizeof(w
));
90 random_add_noise(&w
, sizeof(w
));
91 w
= GetClipboardOwner();
92 random_add_noise(&w
, sizeof(w
));
93 z
= GetQueueStatus(QS_ALLEVENTS
);
94 random_add_noise(&z
, sizeof(z
));
97 random_add_noise(&pt
, sizeof(pt
));
99 GlobalMemoryStatus(&memstat
);
100 random_add_noise(&memstat
, sizeof(memstat
));
102 GetThreadTimes(GetCurrentThread(), times
, times
+ 1, times
+ 2,
104 random_add_noise(×
, sizeof(times
));
105 GetProcessTimes(GetCurrentProcess(), times
, times
+ 1, times
+ 2,
107 random_add_noise(×
, sizeof(times
));
111 * This function is called on every keypress or mouse move, and
112 * will add the current Windows time and performance monitor
113 * counter to the noise pool. It gets the scan code or mouse
114 * position passed in.
116 void noise_ultralight(unsigned long data
)
119 LARGE_INTEGER perftime
;
121 random_add_noise(&data
, sizeof(DWORD
));
123 wintime
= GetTickCount();
124 random_add_noise(&wintime
, sizeof(DWORD
));
126 if (QueryPerformanceCounter(&perftime
))
127 random_add_noise(&perftime
, sizeof(perftime
));