git.distorted.org.uk Git - u/mdw/putty/blob - noise.c

   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 }