#include <stdio.h>

#define MAX_LENGTH 256
#define KEY 1

char *encrypt (char *klartext, int schluessel) {
    char encrypted[MAX_LENGTH];
    int i, ord;

    for(i = 0; i < strlen(klartext); i++) {
        ord = (int)klartext[i];
        encrypted[i] = (char)ord+schluessel;
    }

    return &encrypted;
}



void main () {
    FILE * pFile;
    char name[MAX_LENGTH], pass[MAX_LENGTH];

    //Username
    printf ("Enter Username:");
    fgets (name,sizeof(name)-1,stdin);
    fflush(stdin);
    name[strlen(name)-1] = '\x00';

    //Password
    printf ("Enter Password:");
    fgets (pass,sizeof(pass)-1,stdin);
    fflush(stdin);
    pass[strlen(pass)-1] = '\x00';

    pFile = fopen("daten.txt", "a");
    if(!fopen)
        return;
    fprintf(pFile, "%s:%s", name, encrypt(pass, KEY));
    fclose(pFile);

    getchar();
    return;

}