Program enkripsi data metode RC4 C++

Setelah sebelumnya andik19 berbagi algoritma enkripsi RC4, kali andik19 akan membagikan source code RC4 . Source code ini adalah implementasi dari algoritma RC4 .  

Source code:

#include <cstdlib>
#include <iostream>
#include <winsock.h>
#include <windows.h>
#include <string>
using namespace std;

void rc4(unsigned char * input, unsigned char * key,unsigned char * &output){                   
 
    unsigned char * doc; 
    int i,j=0,t,n,s[256], s2[256],temp,K; 
  
    for (i=0;i<256;i++){
     s[i]=i;//mengisi indek
     s2[i]= key[(i % strlen((char *)key))]; //mengisi index s2 dengan key sampai penuh
    }
    //KSA 
    for (i=0;i<256;i++){
     j = (j + s[i] + s2[i]) % 256;
     temp=s[i];
     s[i]=s[j];
     s[j]=temp;
    }
 
    doc = new unsigned char [ (int)strlen((char *)input)] ;
 //PGRA
    for (i=j=n=0;n<(int)strlen((char *)input);n++){
        i = (i + 1) % 256;
        j = (j + s[i]) % 256;
      
        temp=s[i];
        s[i]=s[j];
        s[j]=temp;//swap

        t = (s[i] + s[j]) % 256;
        K = s[t];//keyStream       
        doc[n]=input[n]^K;//XOR //ENCRIPT   //DECRIPT
 } 
    doc[n]='\0';
    output=doc;
}


int main(int argc, char *argv[])
{
    unsigned char * plaintext;
    unsigned char * key;
    unsigned char * encrypted;
    unsigned char * decrypted;

    plaintext=(unsigned char *)"Andik19 .blogspot.com";
  
    key=(unsigned char *)"abc";//key harus sama

    rc4(plaintext,key,encrypted);
    cout << "Data asli " << plaintext << endl;
    cout << "Data encrypted " << encrypted << endl;
    rc4(encrypted,key,decrypted); //encrypted sbg input
    cout << "Data decripted " << decrypted << endl;
  
    system("PAUSE");
                
}

Jika kamu ingin mendapatkan project script diatas , silahkan langsung download :
- Download RC4 source code <dev c++ project>
atau bisa melihat post selanjutnya yakni program client server chat dengan metode RC4 stream cipher


Terimakasih , semoga membantu.