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sm: HAVE_AES128 allows to complete AES128 by Host instead of Bluetooth Controller - rarely needed

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This commit is contained in:
Matthias Ringwald 2017-05-02 15:30:45 +02:00
parent 98b5831b73
commit 7df1ef2f9e
2 changed files with 38 additions and 1 deletions
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1
doc/manual/docs/how_to.md
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@ -40,6 +40,7 @@ System properties:
#define | Description
-----------------------------------|-------------------------------------
HAVE_MALLOC | Use dynamic memory
HAVE_AES128 | Use platform AES128 engine - not needed usually
Embedded platform properties:

38
src/ble/sm.c
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@ -251,6 +251,13 @@ static btstack_linked_list_t sm_address_resolution_general_queue;
static sm_aes128_state_t sm_aes128_state;
static void * sm_aes128_context;
// use aes128 provided by MCU - not needed usually
#ifdef HAVE_AES128
static uint8_t aes128_result_flipped[16];
static btstack_timer_source_t aes128_timer;
static void btstack_aes128_calc(uint8_t * key, uint8_t * plaintext, uint8_t * result);
#endif
// random engine. store context (ususally sm_connection_t)
static void * sm_random_context;
@ -398,6 +405,7 @@ static void sm_done_for_handle(hci_con_handle_t con_handle);
static sm_connection_t * sm_get_connection_for_handle(hci_con_handle_t con_handle);
static inline int sm_calc_actual_encryption_key_size(int other);
static int sm_validate_stk_generation_method(void);
static void sm_handle_encryption_result(uint8_t * data);
static void log_info_hex16(const char * name, uint16_t value){
log_info("%-6s 0x%04x", name, value);
@ -512,15 +520,43 @@ static void sm_random_start(void * context){
hci_send_cmd(&hci_le_rand);
}
#ifdef HAVE_AES128
static void aes128_completed(btstack_timer_source_t * ts){
UNUSED(ts);
sm_handle_encryption_result(&aes128_result_flipped[0]);
sm_run();
}
#endif
// pre: sm_aes128_state != SM_AES128_ACTIVE, hci_can_send_command == 1
// context is made availabe to aes128 result handler by this
static void sm_aes128_start(sm_key_t key, sm_key_t plaintext, void * context){
sm_aes128_state = SM_AES128_ACTIVE;
sm_aes128_context = context;
#ifdef HAVE_AES128
// calc result directly
sm_key_t result;
btstack_aes128_calc(key, plaintext, result);
// log
log_info_key("key", key);
log_info_key("txt", plaintext);
log_info_key("res", result);
// flip
reverse_128(&result[0], &aes128_result_flipped[0]);
// deliver via timer
btstack_run_loop_set_timer_handler(&aes128_timer, &aes128_completed);
btstack_run_loop_set_timer(&aes128_timer, 0); // no delay
btstack_run_loop_add_timer(&aes128_timer);
#else
sm_key_t key_flipped, plaintext_flipped;
reverse_128(key, key_flipped);
reverse_128(plaintext, plaintext_flipped);
sm_aes128_context = context;
hci_send_cmd(&hci_le_encrypt, key_flipped, plaintext_flipped);
#endif
}
// ah(k,r) helper