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