c/biometrics/biom.c

   1 #include <stdio.h>
   2 #include <time.h>
   3 #include <math.h>
   4
   5 #define PWSIZE 32
   6 #define TIMERES 1000
   7
   8 int main() {
   9
  10 while(1) printf("c: %d, cps %d\n", clock(), CLOCKS_PER_SEC);
  11
  12 char passwd[PWSIZE], loginpasswd[PWSIZE];
  13 long timestamp[PWSIZE], logintimestamp;
  14 int i, sensitivity = 200;
  15
  16 setbuf(stdin, NULL);
  17 setbuf(stdout, NULL);
  18
  19
  20 printf("Enter new pwd: ");
  21 for(i=0;i<(PWSIZE-1);i++) {
  22         clock();
  23         passwd[i] = getchar();
  24         if(passwd[i] == '\n') {
  25                 i++;
  26                 break;
  27         }
  28         putchar('*');
  29         timestamp[i] = 0;
  30         timestamp[i] += clock()/CLOCKS_PER_SEC;
  31 }
  32 passwd[i] = 0;
  33
  34 while(1) {
  35
  36         printf("Enter login pwd: ");
  37         for(i=0;i<(PWSIZE-1);i++) {
  38                 clock();
  39                 if(getchar() != passwd[i]) {
  40                         printf("\nIncorrect!\n");
  41                         break;
  42                 }
  43                 logintimestamp = 0;
  44                 logintimestamp += clock()/CLOCKS_PER_SEC;
  45                 logintimestamp -= timestamp[i];
  46                 if(sqrt(logintimestamp*logintimestamp) > sensitivity) {
  47                         printf("\nIncorrect timing!\n");
  48                         break;
  49                 }
  50         }
  51
  52 }
  53
  54
  55
  56 }