| 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 | } |