#include <stdio.h>
#include <string.h>
 
void ordinals(const char *string, int *result, int *size) {
    *size = 0;
    while (*string) {
        result[(*size)++] = (int)(*string++);
    }
}
 
void encode(const int *ords_list, int size, int *result) {
    for (int i = 0; i < size; i++) {
        result[i] = ords_list[i] ^ 'a';
    }
}
 
void characters(const int *ords_list, int size, char *result) {
    for (int i = 0; i < size; i++) {
        result[i] = (char)ords_list[i];
    }
    result[size] = '\0'; // Null-terminate the string
}
 
int main() {
    int encrypted_flag[] = {54, 9, 8, 18, 17, 4, 19, 4, 5, 53, 14, 15, 4, 18};
    int decoded_flag[14];
    char flag[15]; // Adjust size for null terminator
    int size;
 
    encode(encrypted_flag, 14, decoded_flag);
    characters(decoded_flag, 14, flag);
 
    char attempt[100]; // Buffer for user input
    printf("enter passphrase here: ");
    fgets(attempt, sizeof(attempt), stdin);
    attempt[strcspn(attempt, "\n")] = 0; // Remove newline character
 
    if (strcmp(attempt, flag) == 0) {
        printf("congratulations, welcome to the secret program!\n");
    } else {
        printf("incorrect passphrase\n");
    }
 
    return 0;
}
 
 

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/*  Berechnung des Hamming-Abstandes zwischen zwei 128-Bit Werten in 	*/
/*	einer Textdatei. 													*/
/*  Die Werte müssen auf einer separaten Zeile gespeichert sein			*/
/* 																		*/
/*	Erstellt: 17.5.2010													*/
/*  Autor: Thomas Scheffler												*/

#include <stdio.h>
#include <stdlib.h>

#define ARRAY_SIZE 32

unsigned Hamdist(unsigned x, unsigned y)
{
  unsigned dist = 0, val = x ^ y;
 
  // Count the number of set bits
  while(val)
  {
    ++dist; 
    val &= val - 1;
  }
 
  return dist;
}



int main (void)
{
	char hex;
	int i;
	int a[ARRAY_SIZE];
	int b[ARRAY_SIZE];
	int hamDist = 0;
	FILE* fp;
	
	//Arrays mit 0 initialisieren
	for (i = 0; i < ARRAY_SIZE; ++i)
	{
  		a[i] = 0;
  		b[i] = 0;
	}

	
	fp = fopen("hex.txt","r");
	if (fp == NULL) 
	{
		printf("Die Datei hex.txt wurde nicht gefunden!");
		exit(EXIT_FAILURE);
	}

	i=0;
	printf("1.Zeile einlesen.\n");

 	while((hex=fgetc(fp))!='\n' && hex != EOF)
    {
        a[i]=strtol(&hex,0,16);
		i++;
    }
	i=0;
	printf("2.Zeile einlesen.\n");

 	while((hex=fgetc(fp))!='\n' && hex != EOF)
    {
    	b[i]=strtol(&hex,0,16);
        i++;
    }
	fclose(fp);

	printf("Hamming-Abweichung pro Nibble:\n");
	for (i = 0; i < ARRAY_SIZE; ++i)
	{
		printf ("%i\t%i\t%i\n",a[i],b[i],Hamdist(a[i],b[i]));
		hamDist += Hamdist(a[i],b[i]);
	}
	printf ("\nHamming-Abweichung der Hash-Werte:%d\n",hamDist);
}