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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 | /* |
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13 | * GetSystemPowerStatus function. |
14 | */ |
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15 | typedef BOOL(WINAPI * gsps_t) (LPSYSTEM_POWER_STATUS); |
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16 | static gsps_t gsps; |
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17 | |
18 | /* |
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19 | * This function is called once, at PuTTY startup, and will do some |
20 | * seriously silly things like listing directories and getting disk |
21 | * free space and a process snapshot. |
22 | */ |
23 | |
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24 | void noise_get_heavy(void (*func) (void *, int)) |
25 | { |
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26 | HANDLE srch; |
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27 | WIN32_FIND_DATA finddata; |
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28 | char winpath[MAX_PATH + 3]; |
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29 | HMODULE mod; |
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30 | |
31 | GetWindowsDirectory(winpath, sizeof(winpath)); |
32 | strcat(winpath, "\\*"); |
33 | srch = FindFirstFile(winpath, &finddata); |
34 | if (srch != INVALID_HANDLE_VALUE) { |
35 | do { |
36 | func(&finddata, sizeof(finddata)); |
37 | } while (FindNextFile(srch, &finddata)); |
38 | FindClose(srch); |
39 | } |
40 | |
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41 | read_random_seed(func); |
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42 | /* Update the seed immediately, in case another instance uses it. */ |
43 | random_save_seed(); |
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44 | |
45 | gsps = NULL; |
46 | mod = GetModuleHandle("KERNEL32"); |
47 | if (mod) { |
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48 | gsps = (gsps_t) GetProcAddress(mod, "GetSystemPowerStatus"); |
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49 | } |
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50 | } |
51 | |
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52 | void random_save_seed(void) |
53 | { |
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54 | int len; |
55 | void *data; |
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56 | |
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57 | if (random_active) { |
58 | random_get_savedata(&data, &len); |
59 | write_random_seed(data, len); |
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60 | sfree(data); |
93b581bd |
61 | } |
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62 | } |
63 | |
64 | /* |
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65 | * This function is called every time the random pool needs |
66 | * stirring, and will acquire the system time in all available |
67 | * forms and the battery status. |
68 | */ |
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69 | void noise_get_light(void (*func) (void *, int)) |
70 | { |
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71 | SYSTEMTIME systime; |
72 | DWORD adjust[2]; |
73 | BOOL rubbish; |
74 | SYSTEM_POWER_STATUS pwrstat; |
75 | |
76 | GetSystemTime(&systime); |
77 | func(&systime, sizeof(systime)); |
78 | |
79 | GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish); |
80 | func(&adjust, sizeof(adjust)); |
81 | |
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82 | /* |
83 | * Call GetSystemPowerStatus if present. |
84 | */ |
85 | if (gsps) { |
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86 | if (gsps(&pwrstat)) |
87 | func(&pwrstat, sizeof(pwrstat)); |
a4e14164 |
88 | } |
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89 | } |
90 | |
91 | /* |
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92 | * This function is called on a timer, and it will monitor |
93 | * frequently changing quantities such as the state of physical and |
94 | * virtual memory, the state of the process's message queue, which |
95 | * window is in the foreground, which owns the clipboard, etc. |
96 | */ |
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97 | void noise_regular(void) |
98 | { |
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99 | HWND w; |
100 | DWORD z; |
101 | POINT pt; |
102 | MEMORYSTATUS memstat; |
103 | FILETIME times[4]; |
104 | |
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105 | w = GetForegroundWindow(); |
106 | random_add_noise(&w, sizeof(w)); |
107 | w = GetCapture(); |
108 | random_add_noise(&w, sizeof(w)); |
109 | w = GetClipboardOwner(); |
110 | random_add_noise(&w, sizeof(w)); |
111 | z = GetQueueStatus(QS_ALLEVENTS); |
112 | random_add_noise(&z, sizeof(z)); |
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113 | |
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114 | GetCursorPos(&pt); |
115 | random_add_noise(&pt, sizeof(pt)); |
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116 | |
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117 | GlobalMemoryStatus(&memstat); |
118 | random_add_noise(&memstat, sizeof(memstat)); |
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119 | |
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120 | GetThreadTimes(GetCurrentThread(), times, times + 1, times + 2, |
121 | times + 3); |
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122 | random_add_noise(×, sizeof(times)); |
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123 | GetProcessTimes(GetCurrentProcess(), times, times + 1, times + 2, |
124 | times + 3); |
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125 | random_add_noise(×, sizeof(times)); |
126 | } |
127 | |
128 | /* |
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129 | * This function is called on every keypress or mouse move, and |
130 | * will add the current Windows time and performance monitor |
131 | * counter to the noise pool. It gets the scan code or mouse |
132 | * position passed in. |
133 | */ |
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134 | void noise_ultralight(unsigned long data) |
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135 | { |
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136 | DWORD wintime; |
137 | LARGE_INTEGER perftime; |
138 | |
139 | random_add_noise(&data, sizeof(DWORD)); |
140 | |
141 | wintime = GetTickCount(); |
142 | random_add_noise(&wintime, sizeof(DWORD)); |
143 | |
144 | if (QueryPerformanceCounter(&perftime)) |
145 | random_add_noise(&perftime, sizeof(perftime)); |
146 | } |