/* Bluetooth Mesh */
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/*
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* Copyright (c) 2017 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "nimble_syscfg.h"
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#define MESH_LOG_MODULE BLE_MESH_CRYPTO_LOG
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#include <string.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <tinycrypt/constants.h>
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#include <tinycrypt/utils.h>
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#include <tinycrypt/aes.h>
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#include <tinycrypt/cmac_mode.h>
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#include <tinycrypt/ccm_mode.h>
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#include "crypto.h"
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#define NET_MIC_LEN(pdu) (((pdu)[1] & 0x80) ? 8 : 4)
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#define APP_MIC_LEN(aszmic) ((aszmic) ? 8 : 4)
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int bt_mesh_aes_cmac(const uint8_t key[16], struct bt_mesh_sg *sg,
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size_t sg_len, uint8_t mac[16])
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{
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struct tc_aes_key_sched_struct sched;
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struct tc_cmac_struct state;
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if (tc_cmac_setup(&state, key, &sched) == TC_CRYPTO_FAIL) {
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return -EIO;
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}
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for (; sg_len; sg_len--, sg++) {
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if (tc_cmac_update(&state, sg->data,
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sg->len) == TC_CRYPTO_FAIL) {
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return -EIO;
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}
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}
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if (tc_cmac_final(mac, &state) == TC_CRYPTO_FAIL) {
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return -EIO;
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}
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return 0;
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}
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int bt_mesh_k1(const uint8_t *ikm, size_t ikm_len, const uint8_t salt[16],
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const char *info, uint8_t okm[16])
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{
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int err;
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err = bt_mesh_aes_cmac_one(salt, ikm, ikm_len, okm);
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if (err < 0) {
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return err;
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}
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return bt_mesh_aes_cmac_one(okm, info, strlen(info), okm);
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}
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int bt_mesh_k2(const uint8_t n[16], const uint8_t *p, size_t p_len,
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uint8_t net_id[1], uint8_t enc_key[16], uint8_t priv_key[16])
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{
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struct bt_mesh_sg sg[3];
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uint8_t salt[16];
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uint8_t out[16];
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uint8_t t[16];
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uint8_t pad;
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int err;
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BT_DBG("n %s", bt_hex(n, 16));
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BT_DBG("p %s", bt_hex(p, p_len));
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err = bt_mesh_s1("smk2", salt);
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if (err) {
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return err;
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}
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err = bt_mesh_aes_cmac_one(salt, n, 16, t);
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if (err) {
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return err;
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}
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pad = 0x01;
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sg[0].data = NULL;
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sg[0].len = 0;
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sg[1].data = p;
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sg[1].len = p_len;
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sg[2].data = &pad;
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sg[2].len = sizeof(pad);
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err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out);
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if (err) {
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return err;
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}
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net_id[0] = out[15] & 0x7f;
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sg[0].data = out;
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sg[0].len = sizeof(out);
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pad = 0x02;
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err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out);
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if (err) {
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return err;
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}
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memcpy(enc_key, out, 16);
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pad = 0x03;
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err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out);
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if (err) {
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return err;
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}
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memcpy(priv_key, out, 16);
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BT_DBG("NID 0x%02x enc_key %s", net_id[0], bt_hex(enc_key, 16));
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BT_DBG("priv_key %s", bt_hex(priv_key, 16));
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return 0;
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}
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int bt_mesh_k3(const uint8_t n[16], uint8_t out[8])
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{
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uint8_t id64[] = { 'i', 'd', '6', '4', 0x01 };
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uint8_t tmp[16];
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uint8_t t[16];
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int err;
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err = bt_mesh_s1("smk3", tmp);
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if (err) {
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return err;
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}
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err = bt_mesh_aes_cmac_one(tmp, n, 16, t);
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if (err) {
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return err;
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}
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err = bt_mesh_aes_cmac_one(t, id64, sizeof(id64), tmp);
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if (err) {
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return err;
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}
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memcpy(out, tmp + 8, 8);
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return 0;
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}
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int bt_mesh_k4(const uint8_t n[16], uint8_t out[1])
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{
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uint8_t id6[] = { 'i', 'd', '6', 0x01 };
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uint8_t tmp[16];
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uint8_t t[16];
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int err;
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err = bt_mesh_s1("smk4", tmp);
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if (err) {
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return err;
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}
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err = bt_mesh_aes_cmac_one(tmp, n, 16, t);
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if (err) {
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return err;
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}
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err = bt_mesh_aes_cmac_one(t, id6, sizeof(id6), tmp);
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if (err) {
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return err;
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}
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out[0] = tmp[15] & BIT_MASK(6);
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return 0;
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}
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int bt_mesh_id128(const uint8_t n[16], const char *s, uint8_t out[16])
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{
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const char *id128 = "id128\x01";
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uint8_t salt[16];
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int err;
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err = bt_mesh_s1(s, salt);
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if (err) {
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return err;
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}
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return bt_mesh_k1(n, 16, salt, id128, out);
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}
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static void create_proxy_nonce(uint8_t nonce[13], const uint8_t *pdu,
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uint32_t iv_index)
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{
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/* Nonce Type */
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nonce[0] = 0x03;
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/* Pad */
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nonce[1] = 0x00;
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/* Sequence Number */
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nonce[2] = pdu[2];
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nonce[3] = pdu[3];
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nonce[4] = pdu[4];
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/* Source Address */
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nonce[5] = pdu[5];
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nonce[6] = pdu[6];
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/* Pad */
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nonce[7] = 0;
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nonce[8] = 0;
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/* IV Index */
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sys_put_be32(iv_index, &nonce[9]);
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}
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static void create_net_nonce(uint8_t nonce[13], const uint8_t *pdu,
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uint32_t iv_index)
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{
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/* Nonce Type */
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nonce[0] = 0x00;
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/* FRND + TTL */
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nonce[1] = pdu[1];
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/* Sequence Number */
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nonce[2] = pdu[2];
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nonce[3] = pdu[3];
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nonce[4] = pdu[4];
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/* Source Address */
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nonce[5] = pdu[5];
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nonce[6] = pdu[6];
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/* Pad */
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nonce[7] = 0;
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nonce[8] = 0;
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/* IV Index */
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sys_put_be32(iv_index, &nonce[9]);
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}
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int bt_mesh_net_obfuscate(uint8_t *pdu, uint32_t iv_index,
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const uint8_t privacy_key[16])
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{
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uint8_t priv_rand[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, };
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uint8_t tmp[16];
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int err, i;
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BT_DBG("IVIndex %u, PrivacyKey %s", (unsigned) iv_index,
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bt_hex(privacy_key, 16));
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sys_put_be32(iv_index, &priv_rand[5]);
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memcpy(&priv_rand[9], &pdu[7], 7);
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BT_DBG("PrivacyRandom %s", bt_hex(priv_rand, 16));
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err = bt_encrypt_be(privacy_key, priv_rand, tmp);
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if (err) {
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return err;
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}
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for (i = 0; i < 6; i++) {
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pdu[1 + i] ^= tmp[i];
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}
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return 0;
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}
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int bt_mesh_net_encrypt(const uint8_t key[16], struct os_mbuf *buf,
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uint32_t iv_index, bool proxy)
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{
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uint8_t mic_len = NET_MIC_LEN(buf->om_data);
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uint8_t nonce[13];
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int err;
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BT_DBG("IVIndex %u EncKey %s mic_len %u", (unsigned) iv_index,
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bt_hex(key, 16), mic_len);
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BT_DBG("PDU (len %u) %s", buf->om_len, bt_hex(buf->om_data, buf->om_len));
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if (IS_ENABLED(CONFIG_BT_MESH_PROXY) && proxy) {
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create_proxy_nonce(nonce, buf->om_data, iv_index);
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} else {
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create_net_nonce(nonce, buf->om_data, iv_index);
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}
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BT_DBG("Nonce %s", bt_hex(nonce, 13));
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err = bt_ccm_encrypt(key, nonce, &buf->om_data[7], buf->om_len - 7,
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NULL, 0, &buf->om_data[7], mic_len);
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if (!err) {
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net_buf_simple_add(buf, mic_len);
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}
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return err;
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}
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int bt_mesh_net_decrypt(const uint8_t key[16], struct os_mbuf *buf,
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uint32_t iv_index, bool proxy)
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{
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uint8_t mic_len = NET_MIC_LEN(buf->om_data);
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uint8_t nonce[13];
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BT_DBG("PDU (%u bytes) %s", buf->om_len, bt_hex(buf->om_data, buf->om_len));
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BT_DBG("iv_index %u, key %s mic_len %u", (unsigned) iv_index,
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bt_hex(key, 16), mic_len);
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if (IS_ENABLED(CONFIG_BT_MESH_PROXY) && proxy) {
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create_proxy_nonce(nonce, buf->om_data, iv_index);
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} else {
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create_net_nonce(nonce, buf->om_data, iv_index);
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}
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BT_DBG("Nonce %s", bt_hex(nonce, 13));
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buf->om_len -= mic_len;
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return bt_ccm_decrypt(key, nonce, &buf->om_data[7], buf->om_len - 7,
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NULL, 0, &buf->om_data[7], mic_len);
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}
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static void create_app_nonce(uint8_t nonce[13],
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const struct bt_mesh_app_crypto_ctx *ctx)
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{
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if (ctx->dev_key) {
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nonce[0] = 0x02;
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} else {
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nonce[0] = 0x01;
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}
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sys_put_be32((ctx->seq_num | ((uint32_t)ctx->aszmic << 31)), &nonce[1]);
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sys_put_be16(ctx->src, &nonce[5]);
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sys_put_be16(ctx->dst, &nonce[7]);
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sys_put_be32(ctx->iv_index, &nonce[9]);
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}
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int bt_mesh_app_encrypt(const uint8_t key[16],
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const struct bt_mesh_app_crypto_ctx *ctx,
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struct os_mbuf *buf)
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{
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int err;
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uint8_t nonce[13];
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BT_DBG("AppKey %s", bt_hex(key, 16));
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BT_DBG("dev_key %u src 0x%04x dst 0x%04x", ctx->dev_key, ctx->src,
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ctx->dst);
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BT_DBG("seq_num 0x%08x iv_index 0x%08x", ctx->seq_num, ctx->iv_index);
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BT_DBG("Clear: %s", bt_hex(buf->om_data, buf->om_len));
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create_app_nonce(nonce, ctx);
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BT_DBG("Nonce %s", bt_hex(nonce, 13));
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err = bt_ccm_encrypt(key, nonce, buf->om_data, buf->om_len, ctx->ad,
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ctx->ad ? 16 : 0, buf->om_data,
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APP_MIC_LEN(ctx->aszmic));
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if (!err) {
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net_buf_simple_add(buf, APP_MIC_LEN(ctx->aszmic));
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BT_DBG("Encr: %s", bt_hex(buf->om_data, buf->om_len));
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}
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return err;
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}
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int bt_mesh_app_decrypt(const uint8_t key[16],
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const struct bt_mesh_app_crypto_ctx *ctx,
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struct os_mbuf *buf, struct os_mbuf *out)
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{
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uint8_t nonce[13];
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int err;
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BT_DBG("EncData (len %u) %s", buf->om_len,
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bt_hex(buf->om_data, buf->om_len));
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create_app_nonce(nonce, ctx);
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BT_DBG("AppKey %s", bt_hex(key, 16));
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BT_DBG("Nonce %s", bt_hex(nonce, 13));
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err = bt_ccm_decrypt(key, nonce, buf->om_data, buf->om_len, ctx->ad,
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ctx->ad ? 16 : 0, out->om_data,
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APP_MIC_LEN(ctx->aszmic));
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if (!err) {
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net_buf_simple_add(out, buf->om_len);
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}
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return err;
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}
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/* reversed, 8-bit, poly=0x07 */
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static const uint8_t crc_table[256] = {
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0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
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0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
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0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
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0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
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0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
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0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
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0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
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0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
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0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
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0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
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0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
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0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
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0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
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0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
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0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
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0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
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0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
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0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
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0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
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0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
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0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
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0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
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0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
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0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
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0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
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0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
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0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
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0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
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0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
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0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
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0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
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0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
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};
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uint8_t bt_mesh_fcs_calc(const uint8_t *data, uint8_t data_len)
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{
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uint8_t fcs = 0xff;
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while (data_len--) {
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fcs = crc_table[fcs ^ *data++];
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}
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BT_DBG("fcs 0x%02x", 0xff - fcs);
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return 0xff - fcs;
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}
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bool bt_mesh_fcs_check(struct os_mbuf *buf, uint8_t received_fcs)
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{
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const uint8_t *data = buf->om_data;
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uint16_t data_len = buf->om_len;
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uint8_t fcs = 0xff;
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while (data_len--) {
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fcs = crc_table[fcs ^ *data++];
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}
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return crc_table[fcs ^ received_fcs] == 0xcf;
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}
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int bt_mesh_virtual_addr(const uint8_t virtual_label[16], uint16_t *addr)
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{
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uint8_t salt[16];
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uint8_t tmp[16];
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int err;
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err = bt_mesh_s1("vtad", salt);
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if (err) {
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return err;
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}
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err = bt_mesh_aes_cmac_one(salt, virtual_label, 16, tmp);
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if (err) {
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return err;
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}
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*addr = (sys_get_be16(&tmp[14]) & 0x3fff) | 0x8000;
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return 0;
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}
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int bt_mesh_prov_conf_salt(const uint8_t conf_inputs[145], uint8_t salt[16])
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{
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const uint8_t conf_salt_key[16] = { 0 };
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return bt_mesh_aes_cmac_one(conf_salt_key, conf_inputs, 145, salt);
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}
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int bt_mesh_prov_conf_key(const uint8_t dhkey[32], const uint8_t conf_salt[16],
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uint8_t conf_key[16])
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{
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return bt_mesh_k1(dhkey, 32, conf_salt, "prck", conf_key);
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}
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int bt_mesh_prov_conf(const uint8_t conf_key[16], const uint8_t rand[16],
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const uint8_t auth[16], uint8_t conf[16])
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{
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struct bt_mesh_sg sg[] = { { rand, 16 }, { auth, 16 } };
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BT_DBG("ConfirmationKey %s", bt_hex(conf_key, 16));
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BT_DBG("RandomDevice %s", bt_hex(rand, 16));
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BT_DBG("AuthValue %s", bt_hex(auth, 16));
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return bt_mesh_aes_cmac(conf_key, sg, ARRAY_SIZE(sg), conf);
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}
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int bt_mesh_prov_decrypt(const uint8_t key[16], uint8_t nonce[13],
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const uint8_t data[25 + 8], uint8_t out[25])
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{
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return bt_ccm_decrypt(key, nonce, data, 25, NULL, 0, out, 8);
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}
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int bt_mesh_prov_encrypt(const uint8_t key[16], uint8_t nonce[13],
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const uint8_t data[25], uint8_t out[25 + 8])
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{
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return bt_ccm_encrypt(key, nonce, data, 25, NULL, 0, out, 8);
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}
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int bt_mesh_beacon_auth(const uint8_t beacon_key[16], uint8_t flags,
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const uint8_t net_id[8], uint32_t iv_index,
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uint8_t auth[8])
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{
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uint8_t msg[13], tmp[16];
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int err;
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BT_DBG("BeaconKey %s", bt_hex(beacon_key, 16));
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BT_DBG("NetId %s", bt_hex(net_id, 8));
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BT_DBG("IV Index 0x%08x", (unsigned) iv_index);
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msg[0] = flags;
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memcpy(&msg[1], net_id, 8);
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sys_put_be32(iv_index, &msg[9]);
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BT_DBG("BeaconMsg %s", bt_hex(msg, sizeof(msg)));
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err = bt_mesh_aes_cmac_one(beacon_key, msg, sizeof(msg), tmp);
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if (!err) {
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memcpy(auth, tmp, 8);
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}
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return err;
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}
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