cs_RC5.h

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/*
 * Author: Crownstone Team
 * Copyright: Crownstone (https://crownstone.rocks)
 * Date: Oct 16, 2020
 * License: LGPLv3+, Apache License 2.0, and/or MIT (triple-licensed)
 */
 
#pragma once
 
#include <protocol/cs_Packets.h>
 
#define RC5_ROUNDS 12
#define RC5_NUM_SUBKEYS (2 * (RC5_ROUNDS + 1))  // t = 2(r+1) - the number of round subkeys required.
#define RC5_KEYLEN 16
#define RC5_BLOCK_SIZE 4  // Size in bytes of an RC5 block.
 
class RC5 {
public:
    static RC5& getInstance() {
        static RC5 instance;
        return instance;
    }
 
    void init();
 
    bool decrypt(uint16_t* inBuf, uint16_t inBufSize, uint16_t* outBuf, uint16_t outBufSize);
 
private:
    // This class is singleton, make constructor private.
    RC5();
 
    // This class is singleton, deny implementation
    RC5(RC5 const&);
 
    // This class is singleton, deny implementation
    void operator=(RC5 const&);
 
    uint16_t _subKeys[RC5_NUM_SUBKEYS];
 
    bool initKey(EncryptionAccessLevel accessLevel);
 
    bool prepareKey(uint8_t* key, uint8_t keyLength);
};