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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 | if (random_active) { |
57 | random_get_savedata(&data, &len); |
58 | write_random_seed(data, len); |
59 | } |
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60 | } |
61 | |
62 | /* |
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63 | * This function is called every time the random pool needs |
64 | * stirring, and will acquire the system time in all available |
65 | * forms and the battery status. |
66 | */ |
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67 | void noise_get_light(void (*func) (void *, int)) |
68 | { |
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69 | SYSTEMTIME systime; |
70 | DWORD adjust[2]; |
71 | BOOL rubbish; |
72 | SYSTEM_POWER_STATUS pwrstat; |
73 | |
74 | GetSystemTime(&systime); |
75 | func(&systime, sizeof(systime)); |
76 | |
77 | GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish); |
78 | func(&adjust, sizeof(adjust)); |
79 | |
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80 | /* |
81 | * Call GetSystemPowerStatus if present. |
82 | */ |
83 | if (gsps) { |
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84 | if (gsps(&pwrstat)) |
85 | func(&pwrstat, sizeof(pwrstat)); |
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86 | } |
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87 | } |
88 | |
89 | /* |
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90 | * This function is called on a timer, and it will monitor |
91 | * frequently changing quantities such as the state of physical and |
92 | * virtual memory, the state of the process's message queue, which |
93 | * window is in the foreground, which owns the clipboard, etc. |
94 | */ |
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95 | void noise_regular(void) |
96 | { |
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97 | HWND w; |
98 | DWORD z; |
99 | POINT pt; |
100 | MEMORYSTATUS memstat; |
101 | FILETIME times[4]; |
102 | |
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103 | w = GetForegroundWindow(); |
104 | random_add_noise(&w, sizeof(w)); |
105 | w = GetCapture(); |
106 | random_add_noise(&w, sizeof(w)); |
107 | w = GetClipboardOwner(); |
108 | random_add_noise(&w, sizeof(w)); |
109 | z = GetQueueStatus(QS_ALLEVENTS); |
110 | random_add_noise(&z, sizeof(z)); |
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111 | |
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112 | GetCursorPos(&pt); |
113 | random_add_noise(&pt, sizeof(pt)); |
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114 | |
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115 | GlobalMemoryStatus(&memstat); |
116 | random_add_noise(&memstat, sizeof(memstat)); |
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117 | |
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118 | GetThreadTimes(GetCurrentThread(), times, times + 1, times + 2, |
119 | times + 3); |
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120 | random_add_noise(×, sizeof(times)); |
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121 | GetProcessTimes(GetCurrentProcess(), times, times + 1, times + 2, |
122 | times + 3); |
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123 | random_add_noise(×, sizeof(times)); |
124 | } |
125 | |
126 | /* |
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127 | * This function is called on every keypress or mouse move, and |
128 | * will add the current Windows time and performance monitor |
129 | * counter to the noise pool. It gets the scan code or mouse |
130 | * position passed in. |
131 | */ |
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132 | void noise_ultralight(DWORD data) |
133 | { |
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134 | DWORD wintime; |
135 | LARGE_INTEGER perftime; |
136 | |
137 | random_add_noise(&data, sizeof(DWORD)); |
138 | |
139 | wintime = GetTickCount(); |
140 | random_add_noise(&wintime, sizeof(DWORD)); |
141 | |
142 | if (QueryPerformanceCounter(&perftime)) |
143 | random_add_noise(&perftime, sizeof(perftime)); |
144 | } |