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





void verschluesseln(unsigned long* v, unsigned long* k) {
      unsigned long v0 = v[0], v1 = v[1], sum = 0, i;           /* set up */
      unsigned long delta = 0x9e3779b9;                         /* a key schedule constant */
      unsigned long k0 = k[0], k1 = k[1], k2 = k[2], k3 = k[3]; /* cache key */
      for (i = 0; i < 32; i++) {                                /* basic cycle start */
          sum += delta;
          v0 += ((v1<<4) + k0) ^ (v1 + sum) ^ ((v1>>5) + k1);
          v1 += ((v0<<4) + k2) ^ (v0 + sum) ^ ((v0>>5) + k3);   /* end cycle */
      }
      v[0] = v0; v[1] = v1;
}

int main(int argc,char **argv)
{
    char key[17]={"xdfg19rtbg38:+h<"};
    char bla[1],vbuf[18],buf[256];
    char *inhalt_datei,*output_datei;
    unsigned char d=0;
    int i,c,groesse;
    FILE *pf,*pf1;

    pf=fopen("sehrgeheim.txt","rb");

    fseek(pf,0,SEEK_END);
    groesse=ftell(pf);
    fseek(pf,0,SEEK_SET);

    inhalt_datei=calloc(groesse+1,sizeof(char));
    fread(inhalt_datei,sizeof(char),groesse,pf);

        for(c=0;c<groesse;c+=8)
    {
      verschluesseln((unsigned long*)&inhalt_datei[c],(unsigned long*)vbuf);
      sprintf(buf,".%s",argv[1]);
    }
    if((pf1=fopen(buf,"w+b"))>0)
    {
      fwrite(inhalt_datei,1,groesse,pf1);
      fclose(pf1);
    }


    return 0;
}