rc6.hpp

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#ifndef RC6_HPP
#define RC6_HPP
 
#include <cstdint>
#include <vector>
 
class RC6 {
  public:
    RC6(const std::vector<uint8_t> &key);
 
    std::vector<uint8_t> encrypt(const std::vector<uint8_t> &plaintext);
 
    std::vector<uint8_t> decrypt(const std::vector<uint8_t> &ciphertext);
 
  private:
    const int w = 32; 
    const int r = 20; 
    const int b = 16; 
    std::vector<uint32_t> S; 
    void key_schedule(const std::vector<uint8_t> &key);
 
    std::vector<uint32_t> expand(const std::vector<uint8_t> &key);
 
    uint32_t rotl(uint32_t val, int shift);
 
    uint32_t rotr(uint32_t val, int shift);
 
    void encrypt_block(const uint32_t plaintext[2], uint32_t ciphertext[2]);
 
    void decrypt_block(const uint32_t ciphertext[2], uint32_t plaintext[2]);
};
 
#endif