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1 | /* |
2 | * Noise generation for PuTTY's cryptographic random number |
3 | * generator. |
4 | */ |
5 | |
6 | #include <windows.h> |
7 | #include <stdio.h> |
8 | |
9 | #include "putty.h" |
10 | #include "ssh.h" |
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11 | #include "storage.h" |
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12 | |
13 | /* |
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14 | * GetSystemPowerStatus function. |
15 | */ |
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16 | typedef BOOL(WINAPI * gsps_t) (LPSYSTEM_POWER_STATUS); |
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17 | static gsps_t gsps; |
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18 | |
19 | /* |
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20 | * This function is called once, at PuTTY startup, and will do some |
21 | * seriously silly things like listing directories and getting disk |
22 | * free space and a process snapshot. |
23 | */ |
24 | |
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25 | void noise_get_heavy(void (*func) (void *, int)) |
26 | { |
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27 | HANDLE srch; |
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28 | WIN32_FIND_DATA finddata; |
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29 | char winpath[MAX_PATH + 3]; |
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30 | HMODULE mod; |
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31 | |
32 | GetWindowsDirectory(winpath, sizeof(winpath)); |
33 | strcat(winpath, "\\*"); |
34 | srch = FindFirstFile(winpath, &finddata); |
35 | if (srch != INVALID_HANDLE_VALUE) { |
36 | do { |
37 | func(&finddata, sizeof(finddata)); |
38 | } while (FindNextFile(srch, &finddata)); |
39 | FindClose(srch); |
40 | } |
41 | |
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42 | read_random_seed(func); |
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43 | |
44 | gsps = NULL; |
45 | mod = GetModuleHandle("KERNEL32"); |
46 | if (mod) { |
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47 | gsps = (gsps_t) GetProcAddress(mod, "GetSystemPowerStatus"); |
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48 | } |
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49 | } |
50 | |
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51 | void random_save_seed(void) |
52 | { |
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53 | int len; |
54 | void *data; |
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55 | |
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56 | random_get_savedata(&data, &len); |
57 | write_random_seed(data, len); |
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58 | } |
59 | |
60 | /* |
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61 | * This function is called every time the random pool needs |
62 | * stirring, and will acquire the system time in all available |
63 | * forms and the battery status. |
64 | */ |
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65 | void noise_get_light(void (*func) (void *, int)) |
66 | { |
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67 | SYSTEMTIME systime; |
68 | DWORD adjust[2]; |
69 | BOOL rubbish; |
70 | SYSTEM_POWER_STATUS pwrstat; |
71 | |
72 | GetSystemTime(&systime); |
73 | func(&systime, sizeof(systime)); |
74 | |
75 | GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish); |
76 | func(&adjust, sizeof(adjust)); |
77 | |
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78 | /* |
79 | * Call GetSystemPowerStatus if present. |
80 | */ |
81 | if (gsps) { |
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82 | if (gsps(&pwrstat)) |
83 | func(&pwrstat, sizeof(pwrstat)); |
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84 | } |
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85 | } |
86 | |
87 | /* |
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88 | * This function is called on a timer, and it will monitor |
89 | * frequently changing quantities such as the state of physical and |
90 | * virtual memory, the state of the process's message queue, which |
91 | * window is in the foreground, which owns the clipboard, etc. |
92 | */ |
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93 | void noise_regular(void) |
94 | { |
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95 | HWND w; |
96 | DWORD z; |
97 | POINT pt; |
98 | MEMORYSTATUS memstat; |
99 | FILETIME times[4]; |
100 | |
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101 | w = GetForegroundWindow(); |
102 | random_add_noise(&w, sizeof(w)); |
103 | w = GetCapture(); |
104 | random_add_noise(&w, sizeof(w)); |
105 | w = GetClipboardOwner(); |
106 | random_add_noise(&w, sizeof(w)); |
107 | z = GetQueueStatus(QS_ALLEVENTS); |
108 | random_add_noise(&z, sizeof(z)); |
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109 | |
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110 | GetCursorPos(&pt); |
111 | random_add_noise(&pt, sizeof(pt)); |
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112 | |
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113 | GlobalMemoryStatus(&memstat); |
114 | random_add_noise(&memstat, sizeof(memstat)); |
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115 | |
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116 | GetThreadTimes(GetCurrentThread(), times, times + 1, times + 2, |
117 | times + 3); |
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118 | random_add_noise(×, sizeof(times)); |
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119 | GetProcessTimes(GetCurrentProcess(), times, times + 1, times + 2, |
120 | times + 3); |
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121 | random_add_noise(×, sizeof(times)); |
122 | } |
123 | |
124 | /* |
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125 | * This function is called on every keypress or mouse move, and |
126 | * will add the current Windows time and performance monitor |
127 | * counter to the noise pool. It gets the scan code or mouse |
128 | * position passed in. |
129 | */ |
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130 | void noise_ultralight(DWORD data) |
131 | { |
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132 | DWORD wintime; |
133 | LARGE_INTEGER perftime; |
134 | |
135 | random_add_noise(&data, sizeof(DWORD)); |
136 | |
137 | wintime = GetTickCount(); |
138 | random_add_noise(&wintime, sizeof(DWORD)); |
139 | |
140 | if (QueryPerformanceCounter(&perftime)) |
141 | random_add_noise(&perftime, sizeof(perftime)); |
142 | } |