| 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" |
| 11 | #include "storage.h" |
| 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; |
| 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 | |
| 34 | read_random_seed(func); |
| 35 | } |
| 36 | |
| 37 | void random_save_seed(void) { |
| 38 | int len; |
| 39 | void *data; |
| 40 | |
| 41 | random_get_savedata(&data, &len); |
| 42 | write_random_seed(data, len); |
| 43 | } |
| 44 | |
| 45 | /* |
| 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 | |
| 62 | #ifndef WIN32S_COMPAT |
| 63 | if (GetSystemPowerStatus(&pwrstat)) |
| 64 | func(&pwrstat, sizeof(pwrstat)); |
| 65 | #endif |
| 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 | } |