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

   1 /*
   2  * Noise generation for PuTTY's cryptographic random number
   3  * generator.
   4  */
   5
   6 #include <Processes.h>
   7 #include <Types.h>
   8 #include <Timer.h>
   9
  10 #include "putty.h"
  11 #include "ssh.h"
  12 #include "storage.h"
  13
  14 /*
  15  * This function is called once, at PuTTY startup, and will do some
  16  * seriously silly things like listing directories and getting disk
  17  * free space and a process snapshot.
  18  */
  19
  20 static void noise_get_processes(void (*func) (void *, int))
  21 {
  22     ProcessSerialNumber psn = {0, kNoProcess};
  23     ProcessInfoRec info;
  24
  25     for (;;) {
  26         GetNextProcess(&psn);
  27         if (psn.highLongOfPSN == 0 && psn.lowLongOfPSN == kNoProcess) return;
  28         info.processInfoLength = sizeof(info);
  29         info.processName = NULL;
  30         info.processAppSpec = NULL;
  31         GetProcessInformation(&psn, &info);
  32         func(&info, sizeof(info));
  33     }
  34 }
  35
  36 void noise_get_heavy(void (*func) (void *, int))
  37 {
  38
  39     noise_get_light(func);
  40     noise_get_processes(func);
  41     read_random_seed(func);
  42     /* Update the seed immediately, in case another instance uses it. */
  43     random_save_seed();
  44 }
  45
  46 void random_save_seed(void)
  47 {
  48     int len;
  49     void *data;
  50
  51     if (random_active) {
  52         random_get_savedata(&data, &len);
  53         write_random_seed(data, len);
  54         sfree(data);
  55     }
  56 }
  57
  58 /*
  59  * This function is called every time the random pool needs
  60  * stirring, and will acquire the system time.
  61  */
  62 void noise_get_light(void (*func) (void *, int))
  63 {
  64     UnsignedWide utc;
  65
  66     Microseconds(&utc);
  67     func(&utc, sizeof(utc));
  68 }
  69
  70 /*
  71  * This function is called on a timer, and grabs as much changeable
  72  * system data as it can quickly get its hands on.
  73  */
  74 void noise_regular(void)
  75 {
  76     /* XXX */
  77 }
  78
  79 /*
  80  * This function is called on every keypress or mouse move, and
  81  * will add the current time to the noise pool. It gets the scan
  82  * code or mouse position passed in, and adds that too.
  83  */
  84 void noise_ultralight(unsigned long data)
  85 {
  86     UnsignedWide utc;
  87
  88     Microseconds(&utc);
  89     random_add_noise(&utc, sizeof(utc));
  90     random_add_noise(&data, sizeof(data));
  91 }
  92
  93 /*
  94  * Local Variables:
  95  * c-file-style: "simon"
  96  * End:
  97  */