| 1 | /* |
| 2 | * Noise generation for PuTTY's cryptographic random number |
| 3 | * generator. |
| 4 | */ |
| 5 | |
| 6 | #include <windows.h> |
| 7 | #ifndef AUTO_WINSOCK |
| 8 | #ifdef WINSOCK_TWO |
| 9 | #include <winsock2.h> |
| 10 | #else |
| 11 | #include <winsock.h> |
| 12 | #endif |
| 13 | #endif |
| 14 | #include <stdio.h> |
| 15 | |
| 16 | #include "putty.h" |
| 17 | #include "ssh.h" |
| 18 | #include "storage.h" |
| 19 | |
| 20 | /* |
| 21 | * GetSystemPowerStatus function. |
| 22 | */ |
| 23 | typedef BOOL (WINAPI *gsps_t)(LPSYSTEM_POWER_STATUS); |
| 24 | static gsps_t gsps; |
| 25 | |
| 26 | /* |
| 27 | * This function is called once, at PuTTY startup, and will do some |
| 28 | * seriously silly things like listing directories and getting disk |
| 29 | * free space and a process snapshot. |
| 30 | */ |
| 31 | |
| 32 | void noise_get_heavy(void (*func) (void *, int)) { |
| 33 | HANDLE srch; |
| 34 | WIN32_FIND_DATA finddata; |
| 35 | char winpath[MAX_PATH+3]; |
| 36 | HMODULE mod; |
| 37 | |
| 38 | GetWindowsDirectory(winpath, sizeof(winpath)); |
| 39 | strcat(winpath, "\\*"); |
| 40 | srch = FindFirstFile(winpath, &finddata); |
| 41 | if (srch != INVALID_HANDLE_VALUE) { |
| 42 | do { |
| 43 | func(&finddata, sizeof(finddata)); |
| 44 | } while (FindNextFile(srch, &finddata)); |
| 45 | FindClose(srch); |
| 46 | } |
| 47 | |
| 48 | read_random_seed(func); |
| 49 | |
| 50 | gsps = NULL; |
| 51 | mod = GetModuleHandle("KERNEL32"); |
| 52 | if (mod) { |
| 53 | gsps = (gsps_t)GetProcAddress(mod, "GetSystemPowerStatus"); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | void random_save_seed(void) { |
| 58 | int len; |
| 59 | void *data; |
| 60 | |
| 61 | random_get_savedata(&data, &len); |
| 62 | write_random_seed(data, len); |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * This function is called every time the random pool needs |
| 67 | * stirring, and will acquire the system time in all available |
| 68 | * forms and the battery status. |
| 69 | */ |
| 70 | void noise_get_light(void (*func) (void *, int)) { |
| 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 | |
| 82 | /* |
| 83 | * Call GetSystemPowerStatus if present. |
| 84 | */ |
| 85 | if (gsps) { |
| 86 | if (gsps(&pwrstat)) |
| 87 | func(&pwrstat, sizeof(pwrstat)); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * This function is called on every keypress or mouse move, and |
| 93 | * will add the current Windows time and performance monitor |
| 94 | * counter to the noise pool. It gets the scan code or mouse |
| 95 | * position passed in. |
| 96 | */ |
| 97 | void noise_ultralight(DWORD data) { |
| 98 | DWORD wintime; |
| 99 | LARGE_INTEGER perftime; |
| 100 | |
| 101 | random_add_noise(&data, sizeof(DWORD)); |
| 102 | |
| 103 | wintime = GetTickCount(); |
| 104 | random_add_noise(&wintime, sizeof(DWORD)); |
| 105 | |
| 106 | if (QueryPerformanceCounter(&perftime)) |
| 107 | random_add_noise(&perftime, sizeof(perftime)); |
| 108 | } |