encDec.c

#define BLOCKSIZE 16

#include <stdio.h>       /* for fprintf, sprintf */
#include <stdlib.h>      /* for exit */
#include <errno.h>       /* error handling */
#include <string.h>      /* for ? */
#include "encDec_funcs.h"

/* compile with: make */
/* check memory leak with: valgrind --leak-check=yes */

int main(int argc, char *argv[]) {
  char *ifile = NULL;               /* to point to input file name */
  FILE *fip = NULL;                 /* to point to opened input file */
  char *ofile = NULL;               /* to point to output file name */
  FILE *fop = NULL;                 /* to point to opened output file */
  char *kfile = NULL;               /* to point to key file name */
  FILE *fkp = NULL;                 /* to point to opened key file */
  unsigned char block[BLOCKSIZE];   /* to hold bytes read from input file */
  unsigned char key[BLOCKSIZE];     /* to hold key for encryption/decryption read from key file */

  parseArgs(argc, argv, &ifile, &ofile, &kfile);    /* parse arguments and return pointers to filenames */
  
  fip = Fopen(ifile, "r");
  fop = Fopen(ofile, "w");
  fkp = Fopen(kfile, "r");

  readKey(key, BLOCKSIZE, fkp);                     /* read the key for encryption/decryption */
  encryptDecrypt(block, key, BLOCKSIZE, fip, fop);  /* encrypt/decrypt the input file and write to output file */

  Fclose(fip);
  Fclose(fop);
  Fclose(fkp);

  /* Freeing memory to prevent memory leak */
  free(ifile);
  free(ofile);
  free(kfile);

  return 0;
}