write-ups-challenges-2021-2022/crackme/crackme.c

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2021-12-02 23:33:26 +00:00
#include <stdio.h>
const char secret[] = {0xC5, 0xC7, 0xCB, 0xBA, 0xC8, 0x93, 0xBA, 0xA6, 0xAD, 0xA0, 0xA3, 0xB5, 0x9F, 0x99, 0xC8, 0x9F, 0x9C, 0xBC, 0xA9, 0xA1, 0xA9, 0xA1, 0xAC, 0xA9, 0x9C, 0xA5, 0xA0, 0xA7, 0x91, 0x00};
int checkPswd(char buffer[]) {
for (int i = 0; i < sizeof(secret) - 1; i++) {
int* ii = &i;
char* iii = (char*) ii;
if (secret[i] != (((~(buffer[i])) + 15) ^ iii[3])) {
return 1;
}
}
return 0;
}
int pswdReadloop() {
for (int i = 2; i >= 0; i--) {
char buffer[1024];
printf("> ");
fflush(stdout);
fgets(buffer, sizeof(buffer), stdin);
if ((checkPswd(buffer)) == 0) {
return 0;
}
printf("WRONG!!!! %d attempts remaining\n", i);
}
printf("How could you forget the password! Now all is lost because of you...\n");
return 1;
}
int main() {
printf("Give me the password!!!\n");
int correct = pswdReadloop();
if (correct == 0) {
printf("Correct! Wonderful!\n");
}
return correct;
}