#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/sha.h>

int
main(void) {
    FILE *file;
    unsigned char flag[128];
    unsigned char correct_hash[20] = {
        0x4a, 0xc9, 0xb0, 0x57, 0xf8, 0x02, 0x12, 0x60, 0x6c, 0xea,
        0xab, 0xf3, 0xc6, 0x50, 0x5d, 0xaf, 0xed, 0x40, 0xa4, 0x50
    };
    unsigned char password[20];

    printf("Insert your password: ");
    scanf("%37s", password);
    SHA1(password, strlen((char *)password), password);
    if(memcmp(password, correct_hash, 20) == 0) {
        printf("CORRECT PASSWORD!\n");
        file = fopen("/challenges/overshade/flag", "r");
        if(file != NULL) {
            fscanf(file, "%s", flag);
            fclose(file);
            printf("Flag: %s\n", flag);
        } else {
            printf("Error while opening the flag file\n");
        }
    } else {
        printf("WRONG PASSWORD!\n");
    }
    fflush(stdout);

    return 0;
}