c/crypt/crypt.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 int main(int argc, char *argv[])
   5 {
   6   int k, i; //Key, In,
   7   //char sfkey[128] sfin[128], sfout[128];
   8   if (argc <= 1 || argc > 4 ) { printf("Usage: crypt key [in] [out]\n"); return 1; }
   9   FILE* fkey = fopen(argv[1], "rb"); //Open Key
  10   if (argc >= 3) { freopen(argv[2], "rb", stdin); } //Reopen stdin
  11   if (argc == 4) { freopen(argv[3], "wb", stdout); } //Reopen stdout
  12
  13   while( (i = getchar()) != EOF ) {
  14            if ( (k = getc(fkey)) == EOF )
  15               { fseek(fkey, 0L, SEEK_SET); k = getc(fkey); }
  16              //printf("%d: %c\n", k, k); sleep(1); //Debug
  17              putchar(i^k);
  18   }
  19   return 0;
  20 }