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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 | /* |
14 | * This function is called once, at PuTTY startup, and will do some |
15 | * seriously silly things like listing directories and getting disk |
16 | * free space and a process snapshot. |
17 | */ |
18 | |
19 | void noise_get_heavy(void (*func) (void *, int)) { |
20 | HANDLE srch; |
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21 | WIN32_FIND_DATA finddata; |
22 | char winpath[MAX_PATH+3]; |
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 | } |
36 | |
37 | void random_save_seed(void) { |
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38 | int len; |
39 | void *data; |
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40 | |
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41 | random_get_savedata(&data, &len); |
42 | write_random_seed(data, len); |
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43 | } |
44 | |
45 | /* |
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46 | * This function is called every time the random pool needs |
47 | * stirring, and will acquire the system time in all available |
48 | * forms and the battery status. |
49 | */ |
50 | void noise_get_light(void (*func) (void *, int)) { |
51 | SYSTEMTIME systime; |
52 | DWORD adjust[2]; |
53 | BOOL rubbish; |
54 | SYSTEM_POWER_STATUS pwrstat; |
55 | |
56 | GetSystemTime(&systime); |
57 | func(&systime, sizeof(systime)); |
58 | |
59 | GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish); |
60 | func(&adjust, sizeof(adjust)); |
61 | |
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62 | #ifndef WIN32S_COMPAT |
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63 | if (GetSystemPowerStatus(&pwrstat)) |
64 | func(&pwrstat, sizeof(pwrstat)); |
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65 | #endif |
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66 | } |
67 | |
68 | /* |
69 | * This function is called on every keypress or mouse move, and |
70 | * will add the current Windows time and performance monitor |
71 | * counter to the noise pool. It gets the scan code or mouse |
72 | * position passed in. |
73 | */ |
74 | void noise_ultralight(DWORD data) { |
75 | DWORD wintime; |
76 | LARGE_INTEGER perftime; |
77 | |
78 | random_add_noise(&data, sizeof(DWORD)); |
79 | |
80 | wintime = GetTickCount(); |
81 | random_add_noise(&wintime, sizeof(DWORD)); |
82 | |
83 | if (QueryPerformanceCounter(&perftime)) |
84 | random_add_noise(&perftime, sizeof(perftime)); |
85 | } |