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1 | /* |
2 | * Noise generation for PuTTY's cryptographic random number |
3 | * generator. |
4 | */ |
5 | |
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6 | #include <stdio.h> |
7 | |
8 | #include "putty.h" |
9 | #include "ssh.h" |
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10 | #include "storage.h" |
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11 | |
12 | /* |
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. |
16 | */ |
17 | |
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18 | void noise_get_heavy(void (*func) (void *, int)) |
19 | { |
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20 | HANDLE srch; |
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21 | WIN32_FIND_DATA finddata; |
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22 | char winpath[MAX_PATH + 3]; |
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23 | |
24 | GetWindowsDirectory(winpath, sizeof(winpath)); |
25 | strcat(winpath, "\\*"); |
26 | srch = FindFirstFile(winpath, &finddata); |
27 | if (srch != INVALID_HANDLE_VALUE) { |
28 | do { |
29 | func(&finddata, sizeof(finddata)); |
30 | } while (FindNextFile(srch, &finddata)); |
31 | FindClose(srch); |
32 | } |
33 | |
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34 | read_random_seed(func); |
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35 | /* Update the seed immediately, in case another instance uses it. */ |
36 | random_save_seed(); |
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37 | } |
38 | |
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39 | void random_save_seed(void) |
40 | { |
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41 | int len; |
42 | void *data; |
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43 | |
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44 | if (random_active) { |
45 | random_get_savedata(&data, &len); |
46 | write_random_seed(data, len); |
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47 | sfree(data); |
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48 | } |
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49 | } |
50 | |
51 | /* |
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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. |
55 | */ |
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56 | void noise_get_light(void (*func) (void *, int)) |
57 | { |
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58 | SYSTEMTIME systime; |
59 | DWORD adjust[2]; |
60 | BOOL rubbish; |
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61 | |
62 | GetSystemTime(&systime); |
63 | func(&systime, sizeof(systime)); |
64 | |
65 | GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish); |
66 | func(&adjust, sizeof(adjust)); |
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67 | } |
68 | |
69 | /* |
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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. |
74 | */ |
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75 | void noise_regular(void) |
76 | { |
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77 | HWND w; |
78 | DWORD z; |
79 | POINT pt; |
80 | MEMORYSTATUS memstat; |
81 | FILETIME times[4]; |
82 | |
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83 | w = GetForegroundWindow(); |
84 | random_add_noise(&w, sizeof(w)); |
85 | w = GetCapture(); |
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)); |
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91 | |
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92 | GetCursorPos(&pt); |
93 | random_add_noise(&pt, sizeof(pt)); |
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94 | |
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95 | GlobalMemoryStatus(&memstat); |
96 | random_add_noise(&memstat, sizeof(memstat)); |
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97 | |
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98 | GetThreadTimes(GetCurrentThread(), times, times + 1, times + 2, |
99 | times + 3); |
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100 | random_add_noise(×, sizeof(times)); |
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101 | GetProcessTimes(GetCurrentProcess(), times, times + 1, times + 2, |
102 | times + 3); |
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103 | random_add_noise(×, sizeof(times)); |
104 | } |
105 | |
106 | /* |
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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. |
111 | */ |
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112 | void noise_ultralight(unsigned long data) |
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113 | { |
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114 | DWORD wintime; |
115 | LARGE_INTEGER perftime; |
116 | |
117 | random_add_noise(&data, sizeof(DWORD)); |
118 | |
119 | wintime = GetTickCount(); |
120 | random_add_noise(&wintime, sizeof(DWORD)); |
121 | |
122 | if (QueryPerformanceCounter(&perftime)) |
123 | random_add_noise(&perftime, sizeof(perftime)); |
124 | } |