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;
22 char winpath[MAX_PATH + 3];
24 GetWindowsDirectory(winpath, sizeof(winpath));
25 strcat(winpath, "\\*");
26 srch = FindFirstFile(winpath, &finddata);
27 if (srch != INVALID_HANDLE_VALUE) {
29 func(&finddata, sizeof(finddata));
30 } while (FindNextFile(srch, &finddata));
34 read_random_seed(func);
35 /* Update the seed immediately, in case another instance uses it. */
39 void random_save_seed(void)
45 random_get_savedata(&data, &len);
46 write_random_seed(data, len);
52 * This function is called every time the random pool needs
53 * stirring, and will acquire the system time in all available
54 * forms and the battery status.
56 void noise_get_light(void (*func) (void *, int))
62 GetSystemTime(&systime);
63 func(&systime, sizeof(systime));
65 GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish);
66 func(&adjust, sizeof(adjust));
70 * This function is called on a timer, and it will monitor
71 * frequently changing quantities such as the state of physical and
72 * virtual memory, the state of the process's message queue, which
73 * window is in the foreground, which owns the clipboard, etc.
75 void noise_regular(void)
83 w = GetForegroundWindow();
84 random_add_noise(&w, sizeof(w));
86 random_add_noise(&w, sizeof(w));
87 w = GetClipboardOwner();
88 random_add_noise(&w, sizeof(w));
89 z = GetQueueStatus(QS_ALLEVENTS);
90 random_add_noise(&z, sizeof(z));
93 random_add_noise(&pt, sizeof(pt));
95 GlobalMemoryStatus(&memstat);
96 random_add_noise(&memstat, sizeof(memstat));
98 GetThreadTimes(GetCurrentThread(), times, times + 1, times + 2,
100 random_add_noise(×, sizeof(times));
101 GetProcessTimes(GetCurrentProcess(), times, times + 1, times + 2,
103 random_add_noise(×, sizeof(times));
107 * This function is called on every keypress or mouse move, and
108 * will add the current Windows time and performance monitor
109 * counter to the noise pool. It gets the scan code or mouse
110 * position passed in.
112 void noise_ultralight(unsigned long data)
115 LARGE_INTEGER perftime;
117 random_add_noise(&data, sizeof(DWORD));
119 wintime = GetTickCount();
120 random_add_noise(&wintime, sizeof(DWORD));
122 if (QueryPerformanceCounter(&perftime))
123 random_add_noise(&perftime, sizeof(perftime));