Remote Access Control

config.h

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// This file has been prepared for Doxygen automatic documentation generation.
#ifndef CONFIG_H
#define CONFIG_H


#define ASK 
//#define FSK 

//#define BPS_19200
#define BPS_9600
//#define BPS_4800
//#define BPS_2400


#define NOWDT

#define NOBOD

#define INVERTED_MANCHESTER
//#define USE_UART

#define KEY_BITS 128 
//#define KEY_BITS 192 
//#define KEY_BITS 256 

#define SCHEDULE_SPLIT_BLOCKS 8

#define PREBURST_BYTES 16

#define SERIAL_NO_BYTES 4

#define COMMAND_CODE_BYTES 1

#define SEQ_COUNTER_BYTES 4

#define MAC_BYTES 4

#define CRC_POLY 0x8005 // CRC-16 standard.
//#define POLY 0x1021 // CRC-CCITT standard.

#define MAX_WATCHDOG_RESETS 3

#define BUTTON_MASK ((1<<PB1) | (1<<PB2))

#define TEACH_COMMAND ((1<<PB1) | (1<<PB2))





/* --- Calculated parameters follow, do not change --- */

#define BLOCK_SIZE 16
#define CMAC_SUBKEY_SIZE BLOCK_SIZE

// Calculate some info based on key bit count.
#if KEY_BITS == 128
  #define ROUNDS 10 
  #define KEY_SIZE 16 
#elif KEY_BITS == 192
  #define ROUNDS 12 
  #define KEY_SIZE 24 
#elif KEY_BITS == 256
  #define ROUNDS 14 
  #define KEY_SIZE 32 
#else
  #error Key must be 128, 192 or 256 bits!
#endif

#define SCHEDULE_SIZE_BLOCKS (ROUNDS+1)
#define SCHEDULE_SIZE (SCHEDULE_SIZE_BLOCKS*BLOCK_SIZE)
#define SCHEDULE_SPLIT (SCHEDULE_SPLIT_BLOCKS*BLOCK_SIZE)
#define SCHEDULE_EXTRA_BLOCKS (SCHEDULE_SIZE_BLOCKS-SCHEDULE_SPLIT_BLOCKS)
#define SCHEDULE_EXTRA (SCHEDULE_EXTRA_BLOCKS*BLOCK_SIZE)

// Check validity of schedule split configuration.
#if SCHEDULE_EXTRA < 0
  #error Split cannot exceed schedule length
#endif

#define MESSAGE_SIZE_WO_MAC (SERIAL_NO_BYTES+COMMAND_CODE_BYTES+SERIAL_NO_BYTES)

// Check that message payload does not exceed AES block size.
#if MESSAGE_SIZE_WO_MAC > BLOCK_SIZE
  #error Message payload exceeds AES block size.
#endif

#define MESSAGE_SIZE_W_MAC (MESSAGE_SIZE_WO_MAC+MAC_BYTES)

// Prepare type and max value for serial number.
#if SERIAL_NO_BYTES == 1
  #define SERIAL_NO_TYPE byte
  #define SERIAL_NO_MAX 0xff
#elif SERIAL_NO_BYTES == 2
  #define SERIAL_NO_TYPE uint16_t
  #define SERIAL_NO_MAX 0xffff
#elif SERIAL_NO_BYTES == 4
  #define SERIAL_NO_TYPE uint32_t
  #define SERIAL_NO_MAX 0xffffffff
#else
  #error Invalid serial number size, must be 1, 2 or 4 bytes.
#endif

// Prepare type and max value for command code.
#if COMMAND_CODE_BYTES == 1
  #define COMMAND_CODE_TYPE byte
  #define COMMAND_CODE_MAX 0xff
#elif COMMAND_CODE_BYTES == 2
  #define COMMAND_CODE_TYPE uint16_t
  #define COMMAND_CODE_MAX 0xffff
#elif COMMAND_CODE_BYTES == 4
  #define COMMAND_CODE_TYPE uint32_t
  #define COMMAND_CODE_MAX 0xffffffff
#else
  #error Invalid command code size, must be 1, 2 or 4 bytes.
#endif

// Prepare type and max value for sequential counter.
#if SEQ_COUNTER_BYTES == 1
  #define SEQ_COUNTER_TYPE byte
  #define SEQ_COUNTER_MAX 0xff
#elif SEQ_COUNTER_BYTES == 2
  #define SEQ_COUNTER_TYPE uint16_t
  #define SEQ_COUNTER_MAX 0xffff
#elif SEQ_COUNTER_BYTES == 4
  #define SEQ_COUNTER_TYPE uint32_t
  #define SEQ_COUNTER_MAX 0xffffffff
#else
  #error Invalid sequential counter size, must be 1, 2 or 4 bytes.
#endif

#define SERIAL_NO_ADDRESS 0

#define SEQ_COUNTER_ADDRESS (SERIAL_NO_ADDRESS+SERIAL_NO_BYTES)

#define SECRET_KEY_ADDRESS (SEQ_COUNTER_ADDRESS+SEQ_COUNTER_BYTES)

#define SHARED_KEY_ADDRESS (SECRET_KEY_ADDRESS+KEY_SIZE)



#endif