rc4.hpp

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 * Copyright (C) Akiel Aries, <akiel@akiel.org>, et al.
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#ifndef RC4_H
#define RC4_H
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
 
// (2^8)-1, bitmask for a byte
#define BITS 255
#define BYTE_LIMIT 256
 
namespace gpmp {
 
class RC4 {
  public:
    /* swaps two values using uint8_t type */
    void byte_swap(uint8_t *a, uint8_t *b);
    /* swaps two values in a traditional way using chars */
    void trad_swap(unsigned char *a, unsigned char *b);
    /* swaps two values using the XOR operator */
    void XOR_swap(unsigned char *a, unsigned char *b);
    /* Key Scheduling Algorithm */
    void KSA(char *key, unsigned char *S, int swap_type);
    /* Pseudo-Random Generation Algorithm */
    void PRGA(unsigned char *S,
              char *plaintext,
              unsigned char *ciphertext,
              int swap_type);
    /* function to display our hashed text */
    std::string
    store_hash(char *plaintext, unsigned char *hashtext, int swap_type);
    /* compute our hash using the the RC4 encryption algorithm */
    unsigned char *
    compute(char *key, char *plaintext, unsigned char *hashtext, int swap_type);
};
 
} // namespace gpmp
 
#endif