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host/mesh: Reject identical public keys

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This commit address Erratum E10395 and Errata Correction E16350
to ensure that public keys exchanged between Provisioner and
a device aren't identical.

This is port of 33fafe1e2f41e5b61b1dc71f9ad0d8cb0930607f
This commit is contained in:
Krzysztof Kopyściński
2021-11-10 06:24:00 +01:00
committed by Krzysztof Kopyściński
parent e9567a6034
commit 026cbf947c
1 changed files with 10 additions and 1 deletions
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nimble/host/mesh/src/provisioner.c
+10 -1
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@@ -385,8 +385,11 @@ static void prov_dh_key_cb(const uint8_t dhkey[32])
static void prov_dh_key_gen(void)
{
uint8_t remote_pk_le[64], *remote_pk;
uint8_t remote_pk_le[64];
const uint8_t *remote_pk;
const uint8_t *local_pk;
local_pk = &bt_mesh_prov_link.conf_inputs[17];
remote_pk = &bt_mesh_prov_link.conf_inputs[81];
/* Copy remote key in little-endian for bt_dh_key_gen().
@@ -396,6 +399,12 @@ static void prov_dh_key_gen(void)
sys_memcpy_swap(remote_pk_le, remote_pk, 32);
sys_memcpy_swap(&remote_pk_le[32], &remote_pk[32], 32);
if (!memcmp(local_pk, remote_pk, 64)) {
BT_ERR("Public keys are identical");
prov_fail(PROV_ERR_NVAL_FMT);
return;
}
if (bt_dh_key_gen(remote_pk_le, prov_dh_key_cb)) {
BT_ERR("Failed to generate DHKey");
prov_fail(PROV_ERR_UNEXP_ERR);