безопасность — я пытаюсь сделать потоковый шифр RC4 в C ++ или JAVA, но не могу получить вывод

Это реализация потокового шифра RC4 в C ++, есть проблема, которую я не нашел точно. Я не могу получить вывод, когда я отлаживаю код.

#include <string>
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <stdio.h>
#include <stdint.h>
#include <assert.h>

class State
{
unsigned char s[256];
int i, j;
void swap(int a, int b);
public:
unsigned char getbyte(void);
State(unsigned char key[], int length);
};
State::State(unsigned char key[], int length)
{
for (int k = 0; k<256; k++)
{
s[k] = k;
}
j = 0;
for (i = 0; i<256; i++)
{
j = (j + s[i] + key[i % length]) % 256;
swap(i, j);
}
i = j = 0;
}
void State::swap(int a, int b)
{
unsigned char temp = s[i];
s[i] = s[j];
s[j] = temp;
}
unsigned char State::getbyte(void)
{
i = (i + 1) % 256;
j = (j + s[i]) % 256;
swap(i, j);
int index = (s[i] + s[j]) % 256;
return s[index];
}
void parseargs(int argc, char ** argv, std::string & key, std::string & file, bool & hex)
{
bool readkey = false;
bool readfile = false;
bool toomanyargs = false;
for (int i = 1; i<argc; i++)
{
std::string arg = argv[i];
if (arg == "-h")
{
hex = true;
}
else if (!readkey)
{
key = arg;
readkey = true;
}
else if (!readfile)
{
file = arg;
readfile = true;
}
else
{
toomanyargs = true;
}
}
if (toomanyargs || !readfile || !readkey)
{
std::cout << "Usage is: " << argv[0] << " [-h] key file" << std::endl;
exit(EXIT_FAILURE);
}
return;
}
void gethexdigit(char in, unsigned char & out)
{
if (in >= '0' && in <= '9')
{
out += in - '0';
}
else if (in >= 'a' && in <= 'f')
{
out += in - 'a' + 10;
}
else
{
std::cout << "Hex key contains letter outside range 0-9 or a-z: " << in << std::endl;
exit(EXIT_FAILURE);
}
}
int gethexkey(unsigned char data[], std::string key)
{
if (key.length() % 2) //key must be of even length if it's hex
{
std::cout << "Hex key must have an even number of characters" << std::endl;
exit(EXIT_FAILURE);
}
if (key.length() > 512)
{
std::cout << "Hex key cannot be longer than 512 characters long" << std::endl;
exit(EXIT_FAILURE);
}
unsigned char byte;
size_t i;
for (i = 0; i < key.length(); i++)
{
gethexdigit(key[i], byte);
byte <<= 4;
i++;
gethexdigit(key[i], byte);
data[(i - 1) / 2] = byte;
}
return i / 2;
}
int gettextkey(unsigned char data[], std::string key)
{
if (key.length() > 256)
{
std::cout << "ASCII key must be 256 characters or less" << std::endl;
exit(EXIT_FAILURE);
}
size_t i;
for (i = 0; i<key.length(); i++)
{
data[i] = key[i];
}
return i;
}
int main(int argc, char **argv)
{
std::string key, file;
bool hex = false;
parseargs(argc, argv, key, file, hex);
int len = 0;
unsigned char keydata[256];
if (hex)
len = gethexkey(keydata, key);
else
len = gettextkey(keydata, key);
State bytestream(keydata, len);
std::fstream infile;
infile.open(file.c_str(), std::ios::in | std::ios::binary);
if (!infile.is_open())
{
std::cout << file << " does not exist" << std::endl;
exit(EXIT_FAILURE);
}
if (file.find(".rc4", file.length() - 4) != std::string::npos) //ie, if file ends with ".rc4"{
file.erase(file.length() - 4);
}
else
{
file.append(".rc4");
}
std::fstream outfile;
outfile.open(file.c_str(), std::ios::in);
if (outfile.is_open()) //file we are going to write to exists!
{
std::cout << file << " already exists, aborting to preserve it" << std::endl;
exit(EXIT_FAILURE);
}
outfile.close();
outfile.open(file.c_str(), std::ios::out | std::ios::binary);
if (outfile.is_open()) //Test if we were able to open the file for writing
{
char inbyte;
char outbyte;
unsigned char streambyte;
infile.get(inbyte);
while (!infile.eof())
{
streambyte = bytestream.getbyte();
outbyte = inbyte ^ streambyte;
outfile.put(outbyte);
infile.get(inbyte);
}
}
else
{
std::cout << "Could not open " << file << " for writing\n" << std::endl;
exit(EXIT_FAILURE);
}
outfile.close();
infile.close();
std::cout << "Encryption finished, output to " << file << std::endl;
system("pause");
return 0;
}