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mesh: add mesh_network_key_derive to mesh_crypto.h

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This commit is contained in:
Matthias Ringwald 2019-04-23 17:13:07 +02:00
parent 4a0ab6ffc5
commit 190358c6cc
3 changed files with 90 additions and 2 deletions
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71
src/ble/mesh/mesh_crypto.c
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@ -206,4 +206,73 @@ void mesh_virtual_address(btstack_crypto_aes128_cmac_t * request, const uint8_t
mesh_virtual_address_arg = callback_arg;
mesh_virtual_address_hash = addr;
btstack_crypto_aes128_cmac_message(request, mesh_salt_vtad, 16, label_uuid, mesh_virtual_address_temp, mesh_virtual_address_temp_callback, request);
}
}
//
static void * mesh_network_key_derive_arg;
static void (* mesh_network_key_derive_callback)(void * arg);
static mesh_network_key_t * mesh_network_key_derive_key;
// AES-CMAC_ZERO('nhbk')
static const uint8_t mesh_salt_nhbk[] = {
0x2c, 0x24, 0x61, 0x9a, 0xb7, 0x93, 0xc1, 0x23, 0x3f, 0x6e, 0x22, 0x67, 0x38, 0x39, 0x3d, 0xec, };
// AES-CMAC_ZERO('nkik')
static const uint8_t mesh_salt_nkik[] = {
0xF8, 0x79, 0x5A, 0x1A, 0xAB, 0xF1, 0x82, 0xE4, 0xF1, 0x63, 0xD8, 0x6E, 0x24, 0x5E, 0x19, 0xF4};
static const uint8_t id128_tag[] = { 'i', 'd', '1', '2', '8', 0x01};
// k2: NID (7), EncryptionKey (128), PrivacyKey (128)
static uint8_t k2_result[33];
static void mesh_network_key_derive_network_id_calculated(void * arg) {
// done
(*mesh_network_key_derive_callback)(mesh_network_key_derive_arg);
}
static void mesh_network_key_derive_k2_calculated(void * arg){
printf("NID: %02x\n", k2_result[0]);
printf("EncryptionKey: ");
printf_hexdump(&k2_result[1], 16);
printf("PrivacyKey: ");
printf_hexdump(&k2_result[17], 16);
// store
mesh_network_key_derive_key->nid = k2_result[0];
memcpy(mesh_network_key_derive_key->encryption_key, &k2_result[1], 16);
memcpy(mesh_network_key_derive_key->privacy_key, &k2_result[17], 16);
// calculate Network ID / k3
btstack_crypto_aes128_cmac_t * request = (btstack_crypto_aes128_cmac_t*) arg;
mesh_k3(request, mesh_network_key_derive_key->net_key, mesh_network_key_derive_key->network_id, &mesh_network_key_derive_network_id_calculated, request);
}
static void mesh_network_key_derive_identity_key_calculated(void *arg) {
printf("IdentityKey: ");
printf_hexdump(mesh_network_key_derive_key->identity_key, 16);
// calc k2
btstack_crypto_aes128_cmac_t * request = (btstack_crypto_aes128_cmac_t*) arg;
mesh_k2(request, mesh_network_key_derive_key->net_key, k2_result, &mesh_network_key_derive_k2_calculated, request);
}
static void mesh_network_key_derive_beacon_key_calculated(void *arg){
printf("BeaconKey: ");
printf_hexdump(mesh_network_key_derive_key->beacon_key, 16);
// calc identity key
btstack_crypto_aes128_cmac_t * request = (btstack_crypto_aes128_cmac_t*) arg;
mesh_k1(request, mesh_network_key_derive_key->net_key, 16, mesh_salt_nkik, id128_tag, sizeof(id128_tag),
mesh_network_key_derive_key->identity_key, &mesh_network_key_derive_identity_key_calculated, request);
}
void mesh_network_key_derive(btstack_crypto_aes128_cmac_t * request, mesh_network_key_t * network_key, void (* callback)(void * arg), void * callback_arg){
mesh_network_key_derive_callback = callback;
mesh_network_key_derive_arg = callback_arg;
mesh_network_key_derive_key = network_key;
// calc k1 using
mesh_k1(request, mesh_network_key_derive_key->net_key, 16, mesh_salt_nhbk, id128_tag, sizeof(id128_tag),
mesh_network_key_derive_key->beacon_key, &mesh_network_key_derive_beacon_key_calculated, request);
}

10
src/ble/mesh/mesh_crypto.h
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@ -45,6 +45,7 @@
#include <stdint.h>
#include "btstack_defines.h"
#include "btstack_crypto.h"
#include "mesh_keys.h"
#ifdef __cplusplus
extern "C"
@ -83,6 +84,15 @@ void mesh_k4(btstack_crypto_aes128_cmac_t * request, const uint8_t * n, uint8_t
*/
void mesh_virtual_address(btstack_crypto_aes128_cmac_t * request, const uint8_t * label_uuid, uint16_t * addr, void (* callback)(void * arg), void * callback_arg);
/**
* Derive security material from netkey
* @param request
* @param network_key
* @param callback
* @param callback_arg
*/
void mesh_network_key_derive(btstack_crypto_aes128_cmac_t * request, mesh_network_key_t * network_key, void (* callback)(void * arg), void * callback_arg);
#ifdef __cplusplus
} /* end of extern "C" */
#endif

11
test/mesh/mesh.c
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@ -1841,6 +1841,7 @@ static btstack_crypto_aes128_cmac_t salt_request;
static uint8_t label_uuid[16];
static uint8_t salt_hash[16];
static uint16_t virtual_address_hash;
static mesh_network_key_t test_network_key;
static void salt_complete(void * arg){
int i;
@ -1859,6 +1860,9 @@ static void virtual_address_complete(void * arg){
printf("Virtual Address %04x\n", virtual_address_hash);
}
static void key_derived(void * arg){
}
int btstack_main(void);
int btstack_main(void)
{
@ -1902,7 +1906,12 @@ int btstack_main(void)
// calc virtual address hash
// mesh_virtual_address(&salt_request, label_uuid, &virtual_address_hash, virtual_address_complete, NULL);
//
// calc network key derivative
// btstack_parse_hex("7dd7364cd842ad18c17c2b820c84c3d6", 16, test_network_key.net_key);
// printf("NetKey: ");
// printf_hexdump(test_network_key.net_key, 16);
// mesh_network_key_derive(&salt_request, &test_network_key, key_derived, NULL);
btstack_parse_hex(pts_device_uuid_string, 16, pts_device_uuid);
btstack_print_hex(pts_device_uuid, 16, 0);