буферная память

#include "stdafx.h"
#include <stdio.h>
#include "rijndael.h"
#include <iostream>
#include <time.h>
using namespace std;
#define KEYBITS 256
#define bufsize 160000
 
unsigned char bufin[bufsize],bufout[bufsize];
 
int main(int argc, char ** argv)
{
unsigned long rk[RKLENGTH(KEYBITS)];
unsigned char key[KEYLENGTH(KEYBITS)];
int i;
int nrounds,realreads;
char password[80], sfname[80],dfname[80];
FILE *input,*output;
 
unsigned char plaintext[16];
unsigned char ciphertext[16];
clock_t t1,t2;
float tm;
 
/*
if (argc < 3)
{
fputs("Missing argument\n", stderr);
return 1;
}*/
 
printf("Enter key: ");
gets(password);
printf("Enter source file name: ");
gets(sfname);
printf("Enter destination file name: ");
gets(dfname);
t1=clock();
for (i = 0; i < sizeof(key); i++)
key[i] = *password != 0 ? (*password)++ : 0;
 
input=fopen(sfname,"rb");
output = fopen(dfname, "wb");
if (output == NULL)
{
fputs("File write error", stderr);
return 1;
}
 
nrounds = rijndaelSetupEncrypt(rk, key, 256);
//do
{
realreads=fread(bufin,1,bufsize,input);
int j=0;
while(j<=realreads){
for (int i = 0; i < 16; i++)
{
plaintext[i] = bufin[i+j];
}
rijndaelEncrypt(rk, nrounds, plaintext, ciphertext);
for (int i = 0; i < 16; i++)
{
bufout[i+j]=ciphertext[i];
}
j+=16;
}
fwrite(bufout,1,realreads,output);
}//while(realreads==bufsize);
t2=clock();
tm=(float)(t2-t1)/CLOCKS_PER_SEC;
printf("t=%f\n",tm);
fclose(output);
}