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crackme09.c
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crackme09.c
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <cpuid.h>
// Require that the input string pass a state machine matching:
// Qz+327x*[^n]n+(l9)+
void succeed(char* string) {
printf("Yes, %s is correct!\n", string);
exit(0);
}
void fail(char* string) {
printf("No, %s is not correct.\n", string);
exit(1);
}
int main(int argc, char** argv) {
if (argc != 2) {
printf("Need exactly one argument.\n");
return -1;
}
char state = 0;
for (int i = 0; argv[1][i] != '\0'; i++) {
char c = argv[1][i];
switch (state) {
case 0:
if (c == 'Q') { state = 1; } else { state = 12; }
break;
case 1:
if (c == 'z') { state = 2; } else { state = 12; }
break;
case 2:
if (c == 'z') { state = 2; }
else if (c == '3') { state = 3; }
else { state = 12; }
break;
case 3:
if (c == '2') { state = 4; } else { state = 12; }
break;
case 4:
if (c == '7') { state = 5; } else { state = 12; }
break;
case 5:
if (c == 'x') { state = 7; } else { state = 6; }
break;
case 6:
if (c == 'n') { state = 8; } else { state = 12; }
break;
case 7:
if (c != 'x') { state = 6; }
break;
case 8:
if (c == 'l') { state = 9; }
else if (c != 'n') { state = 12; }
break;
case 9:
if (c == '9') { state = 10; } else { state = 12; }
break;
case 10:
if (c == 'l') { state = 9; } else { state = 12; }
break;
default:
state = 12;
break;
}
}
if (state == 10) {
succeed(argv[1]);
} else {
fail(argv[1]);
}
}