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also calculate DHK durign startup

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This commit is contained in:
matthias.ringwald@gmail.com 2013-12-13 20:34:28 +00:00
parent 833c40cbea
commit 25815557c1
1 changed files with 24 additions and 3 deletions
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27
example/libusb/ble_server.c
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@ -219,6 +219,8 @@ typedef enum {
DKG_W4_WORKING,
DKG_CALC_IRK,
DKG_W4_IRK,
DKG_CALC_DHK,
DKG_W4_DHK,
DKG_IDLE
} derived_key_generation_t;
@ -609,8 +611,22 @@ static void sm_run(void){
swap128(sm_persistent_ir, key_flipped);
sm_aes128_active = 1;
hci_send_cmd(&hci_le_encrypt, key_flipped, plaintext_flipped);
dkg_state++;
}
case DKG_CALC_DHK:
// already busy?
if (sm_aes128_active) break;
{
// DHK = d1(IR, 3, 0)
key_t d1_prime, plaintext_flipped;
sm_d1_d_prime(3, 0, d1_prime); // plaintext
swap128(d1_prime, plaintext_flipped);
key_t key_flipped;
swap128(sm_persistent_ir, key_flipped);
sm_aes128_active = 1;
hci_send_cmd(&hci_le_encrypt, key_flipped, plaintext_flipped);
dkg_state++;
}
dkg_state = DKG_W4_IRK;
return;
default:
break;
@ -1117,7 +1133,7 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
log_info("LTK Request: recalculating with ediv 0x%04x", sm_s_ediv);
// dhk = d1(IR, 1, 0) - enc
// dhk = d1(IR, 3, 0) - enc
// y = dm(dhk, rand) - enc
// div = y xor ediv
// ltk = d1(ER, div, 0) - enc
@ -1179,7 +1195,12 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
case DKG_W4_IRK:
swap128(&packet[6], sm_persistent_irk);
print_key("irk", sm_persistent_irk);
dkg_state = DKG_IDLE;
dkg_state++;
break;
case DKG_W4_DHK:
swap128(&packet[6], sm_persistent_dhk);
print_key("dhk", sm_persistent_dhk);
dkg_state ++;
break;
default:
break;