//-------------------------------------------------------------------
// Filename:     basic_rf_security.c
// Description:  Basic RF security library
//-------------------------------------------------------------------
//-------------------------------------------------------------------
// INCLUDES
//-------------------------------------------------------------------
#ifdef SECURITY_CCM
    #include "hal_defs.h"
    #include "hal_rf_security.h"
    #include "basic_rf.h"
    #include "basic_rf_security.h"

    //-------------------------------------------------------------------
    // CONSTANTS AND DEFINES
    //-------------------------------------------------------------------
    #define FLAG_FIELD                          0x09
    #define NONCE_SIZE                          16

    //-------------------------------------------------------------------
    // LOCAL VARIABLES
    //-------------------------------------------------------------------
    static uint8 nonceTx[NONCE_SIZE];
    static uint8 nonceRx[NONCE_SIZE];

    //-------------------------------------------------------------------
    // GLOBAL FUNCTIONS
    //-------------------------------------------------------------------
    //-------------------------------------------------------------------
    // @fn          basicRfSecurityInit
    // @brief       Initialise key and nonces and write to radio
    // @param       pConfig - file scope variable holding configuration data for basic RF
    // @return      none
    //-------------------------------------------------------------------
    void basicRfSecurityInit(basicRfCfg_t *pConfig)
    {
        uint8 i;

        // Initialise nonce bytes to 0
        for (i = 0; i < NONCE_SIZE; i++)
        {
            nonceRx[i] = 0;
            nonceTx[i] = 0;
        }

        // Set nonce flag field (Byte 0)
        nonceRx[0] = FLAG_FIELD;
        nonceTx[0] = FLAG_FIELD;

        // Set byte 7 and 8 of nonce to myAddr
        nonceTx[8] = (uint8)pConfig->myAddr;
        nonceTx[7] = (uint8)(pConfig->myAddr >> 8);

        // Set Security mode field of nonces (Byte 13)
        nonceRx[13] = SECURITY_CONTROL;
        nonceTx[13] = SECURITY_CONTROL;

        halRfSecurityInit(pConfig->securityKey, nonceRx, nonceTx);
    }
#endif