LoRaMacCrypto.cpp File Reference

#include <stdlib.h>
#include <stdint.h>
#include "system/utilities.h"
#include "system/crypto/aes.h"
#include "system/crypto/cmac.h"
#include "LoRaMacCrypto.h"

Macros
#define	LORAMAC_MIC_BLOCK_B0_SIZE   16

Functions
void	LoRaMacComputeMic (const uint8_t *buffer, uint16_t size, const uint8_t *key, uint32_t address, uint8_t dir, uint32_t sequenceCounter, uint32_t *mic)
void	LoRaMacPayloadEncrypt (const uint8_t *buffer, uint16_t size, const uint8_t *key, uint32_t address, uint8_t dir, uint32_t sequenceCounter, uint8_t *encBuffer)
void	LoRaMacPayloadDecrypt (const uint8_t *buffer, uint16_t size, const uint8_t *key, uint32_t address, uint8_t dir, uint32_t sequenceCounter, uint8_t *decBuffer)
void	LoRaMacJoinComputeMic (const uint8_t *buffer, uint16_t size, const uint8_t *key, uint32_t *mic)
void	LoRaMacJoinDecrypt (const uint8_t *buffer, uint16_t size, const uint8_t *key, uint8_t *decBuffer)
void	LoRaMacJoinComputeSKeys (const uint8_t *key, const uint8_t *appNonce, uint16_t devNonce, uint8_t *nwkSKey, uint8_t *appSKey)

Variables
static uint8_t	MicBlockB0 []
static uint8_t	Mic [16]
static uint8_t	aBlock []
static uint8_t	sBlock []
static lora_aes_context	AesContext
static AES_CMAC_CTX	AesCmacCtx [1]

Macro Definition Documentation

LORAMAC_MIC_BLOCK_B0_SIZE

#define LORAMAC_MIC_BLOCK_B0_SIZE   16

CMAC/AES Message Integrity Code (MIC) Block B0 size

Variable Documentation

MicBlockB0

uint8_t MicBlockB0[]

static

Initial value:

= {0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

MIC field computation initial data

Mic

uint8_t Mic[16]

static

Contains the computed MIC field.

Remarks

Only the 4 first bytes are used

aBlock

uint8_t aBlock[]

static

Initial value:

= {0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                               0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

Encryption aBlock and sBlock

sBlock

uint8_t sBlock[]

static

Initial value:

= {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                               0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

AesContext

lora_aes_context AesContext

static

AES computation context variable

AesCmacCtx

AES_CMAC_CTX AesCmacCtx[1]

static

CMAC computation context variable