| /* Bluetooth Mesh */ |
| |
| /* |
| * Copyright (c) 2017 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <string.h> |
| #include <stdbool.h> |
| #include <errno.h> |
| #include <toolchain.h> |
| #include <zephyr/types.h> |
| #include <sys/byteorder.h> |
| #include <sys/util.h> |
| |
| #include <tinycrypt/constants.h> |
| #include <tinycrypt/utils.h> |
| #include <tinycrypt/aes.h> |
| #include <tinycrypt/cmac_mode.h> |
| #include <tinycrypt/ccm_mode.h> |
| |
| #include <bluetooth/mesh.h> |
| #include <bluetooth/crypto.h> |
| |
| #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_MESH_DEBUG_CRYPTO) |
| #define LOG_MODULE_NAME bt_mesh_crypto |
| #include "common/log.h" |
| |
| #include "mesh.h" |
| #include "crypto.h" |
| |
| #define NET_MIC_LEN(pdu) (((pdu)[1] & 0x80) ? 8 : 4) |
| #define APP_MIC_LEN(aszmic) ((aszmic) ? 8 : 4) |
| |
| int bt_mesh_aes_cmac(const u8_t key[16], struct bt_mesh_sg *sg, |
| size_t sg_len, u8_t mac[16]) |
| { |
| struct tc_aes_key_sched_struct sched; |
| struct tc_cmac_struct state; |
| |
| if (tc_cmac_setup(&state, key, &sched) == TC_CRYPTO_FAIL) { |
| return -EIO; |
| } |
| |
| for (; sg_len; sg_len--, sg++) { |
| if (tc_cmac_update(&state, sg->data, |
| sg->len) == TC_CRYPTO_FAIL) { |
| return -EIO; |
| } |
| } |
| |
| if (tc_cmac_final(mac, &state) == TC_CRYPTO_FAIL) { |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| int bt_mesh_k1(const u8_t *ikm, size_t ikm_len, const u8_t salt[16], |
| const char *info, u8_t okm[16]) |
| { |
| int err; |
| |
| err = bt_mesh_aes_cmac_one(salt, ikm, ikm_len, okm); |
| if (err < 0) { |
| return err; |
| } |
| |
| return bt_mesh_aes_cmac_one(okm, info, strlen(info), okm); |
| } |
| |
| int bt_mesh_k2(const u8_t n[16], const u8_t *p, size_t p_len, |
| u8_t net_id[1], u8_t enc_key[16], u8_t priv_key[16]) |
| { |
| struct bt_mesh_sg sg[3]; |
| u8_t salt[16]; |
| u8_t out[16]; |
| u8_t t[16]; |
| u8_t pad; |
| int err; |
| |
| BT_DBG("n %s", bt_hex(n, 16)); |
| BT_DBG("p %s", bt_hex(p, p_len)); |
| |
| err = bt_mesh_s1("smk2", salt); |
| if (err) { |
| return err; |
| } |
| |
| err = bt_mesh_aes_cmac_one(salt, n, 16, t); |
| if (err) { |
| return err; |
| } |
| |
| pad = 0x01; |
| |
| sg[0].data = NULL; |
| sg[0].len = 0; |
| sg[1].data = p; |
| sg[1].len = p_len; |
| sg[2].data = &pad; |
| sg[2].len = sizeof(pad); |
| |
| err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out); |
| if (err) { |
| return err; |
| } |
| |
| net_id[0] = out[15] & 0x7f; |
| |
| sg[0].data = out; |
| sg[0].len = sizeof(out); |
| pad = 0x02; |
| |
| err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out); |
| if (err) { |
| return err; |
| } |
| |
| memcpy(enc_key, out, 16); |
| |
| pad = 0x03; |
| |
| err = bt_mesh_aes_cmac(t, sg, ARRAY_SIZE(sg), out); |
| if (err) { |
| return err; |
| } |
| |
| memcpy(priv_key, out, 16); |
| |
| BT_DBG("NID 0x%02x enc_key %s", net_id[0], bt_hex(enc_key, 16)); |
| BT_DBG("priv_key %s", bt_hex(priv_key, 16)); |
| |
| return 0; |
| } |
| |
| int bt_mesh_k3(const u8_t n[16], u8_t out[8]) |
| { |
| u8_t id64[] = { 'i', 'd', '6', '4', 0x01 }; |
| u8_t tmp[16]; |
| u8_t t[16]; |
| int err; |
| |
| err = bt_mesh_s1("smk3", tmp); |
| if (err) { |
| return err; |
| } |
| |
| err = bt_mesh_aes_cmac_one(tmp, n, 16, t); |
| if (err) { |
| return err; |
| } |
| |
| err = bt_mesh_aes_cmac_one(t, id64, sizeof(id64), tmp); |
| if (err) { |
| return err; |
| } |
| |
| memcpy(out, tmp + 8, 8); |
| |
| return 0; |
| } |
| |
| int bt_mesh_k4(const u8_t n[16], u8_t out[1]) |
| { |
| u8_t id6[] = { 'i', 'd', '6', 0x01 }; |
| u8_t tmp[16]; |
| u8_t t[16]; |
| int err; |
| |
| err = bt_mesh_s1("smk4", tmp); |
| if (err) { |
| return err; |
| } |
| |
| err = bt_mesh_aes_cmac_one(tmp, n, 16, t); |
| if (err) { |
| return err; |
| } |
| |
| err = bt_mesh_aes_cmac_one(t, id6, sizeof(id6), tmp); |
| if (err) { |
| return err; |
| } |
| |
| out[0] = tmp[15] & BIT_MASK(6); |
| |
| return 0; |
| } |
| |
| int bt_mesh_id128(const u8_t n[16], const char *s, u8_t out[16]) |
| { |
| const char *id128 = "id128\x01"; |
| u8_t salt[16]; |
| int err; |
| |
| err = bt_mesh_s1(s, salt); |
| if (err) { |
| return err; |
| } |
| |
| return bt_mesh_k1(n, 16, salt, id128, out); |
| } |
| |
| static inline void xor16(u8_t *dst, const u8_t *a, const u8_t *b) |
| { |
| dst[0] = a[0] ^ b[0]; |
| dst[1] = a[1] ^ b[1]; |
| dst[2] = a[2] ^ b[2]; |
| dst[3] = a[3] ^ b[3]; |
| dst[4] = a[4] ^ b[4]; |
| dst[5] = a[5] ^ b[5]; |
| dst[6] = a[6] ^ b[6]; |
| dst[7] = a[7] ^ b[7]; |
| dst[8] = a[8] ^ b[8]; |
| dst[9] = a[9] ^ b[9]; |
| dst[10] = a[10] ^ b[10]; |
| dst[11] = a[11] ^ b[11]; |
| dst[12] = a[12] ^ b[12]; |
| dst[13] = a[13] ^ b[13]; |
| dst[14] = a[14] ^ b[14]; |
| dst[15] = a[15] ^ b[15]; |
| } |
| |
| /* pmsg is assumed to have the nonce already present in bytes 1-13 */ |
| static int ccm_calculate_X0(const u8_t key[16], const u8_t *aad, u8_t aad_len, |
| size_t mic_size, u8_t msg_len, u8_t b[16], |
| u8_t X0[16]) |
| { |
| int i, j, err; |
| |
| /* X_0 = e(AppKey, flags || nonce || length) */ |
| b[0] = (((mic_size - 2) / 2) << 3) | ((!!aad_len) << 6) | 0x01; |
| |
| sys_put_be16(msg_len, b + 14); |
| |
| err = bt_encrypt_be(key, b, X0); |
| if (err) { |
| return err; |
| } |
| |
| /* If AAD is being used to authenticate, include it here */ |
| if (aad_len) { |
| sys_put_be16(aad_len, b); |
| |
| for (i = 0; i < sizeof(u16_t); i++) { |
| b[i] = X0[i] ^ b[i]; |
| } |
| |
| j = 0; |
| aad_len += sizeof(u16_t); |
| while (aad_len > 16) { |
| do { |
| b[i] = X0[i] ^ aad[j]; |
| i++, j++; |
| } while (i < 16); |
| |
| aad_len -= 16; |
| i = 0; |
| |
| err = bt_encrypt_be(key, b, X0); |
| if (err) { |
| return err; |
| } |
| } |
| |
| for (; i < aad_len; i++, j++) { |
| b[i] = X0[i] ^ aad[j]; |
| } |
| |
| for (i = aad_len; i < 16; i++) { |
| b[i] = X0[i]; |
| } |
| |
| err = bt_encrypt_be(key, b, X0); |
| if (err) { |
| return err; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int ccm_auth(const u8_t key[16], u8_t nonce[13], |
| const u8_t *cleartext_msg, size_t msg_len, const u8_t *aad, |
| size_t aad_len, u8_t *mic, size_t mic_size) |
| { |
| u8_t b[16], Xn[16], s0[16]; |
| u16_t blk_cnt, last_blk; |
| int err, j, i; |
| |
| last_blk = msg_len % 16; |
| blk_cnt = (msg_len + 15) / 16; |
| if (!last_blk) { |
| last_blk = 16U; |
| } |
| |
| b[0] = 0x01; |
| memcpy(b + 1, nonce, 13); |
| |
| /* S[0] = e(AppKey, 0x01 || nonce || 0x0000) */ |
| sys_put_be16(0x0000, &b[14]); |
| |
| err = bt_encrypt_be(key, b, s0); |
| if (err) { |
| return err; |
| } |
| |
| ccm_calculate_X0(key, aad, aad_len, mic_size, msg_len, b, Xn); |
| |
| for (j = 0; j < blk_cnt; j++) { |
| /* X_1 = e(AppKey, X_0 ^ Payload[0-15]) */ |
| if (j + 1 == blk_cnt) { |
| for (i = 0; i < last_blk; i++) { |
| b[i] = Xn[i] ^ cleartext_msg[(j * 16) + i]; |
| } |
| |
| memcpy(&b[i], &Xn[i], 16 - i); |
| } else { |
| xor16(b, Xn, &cleartext_msg[j * 16]); |
| } |
| |
| err = bt_encrypt_be(key, b, Xn); |
| if (err) { |
| return err; |
| } |
| } |
| |
| /* MIC = C_mic ^ X_1 */ |
| for (i = 0; i < mic_size; i++) { |
| mic[i] = s0[i] ^ Xn[i]; |
| } |
| |
| return 0; |
| } |
| |
| static int ccm_crypt(const u8_t key[16], const u8_t nonce[13], |
| const u8_t *in_msg, u8_t *out_msg, size_t msg_len) |
| { |
| u8_t a_i[16], s_i[16]; |
| u16_t last_blk, blk_cnt; |
| size_t i, j; |
| int err; |
| |
| last_blk = msg_len % 16; |
| blk_cnt = (msg_len + 15) / 16; |
| if (!last_blk) { |
| last_blk = 16U; |
| } |
| |
| a_i[0] = 0x01; |
| memcpy(&a_i[1], nonce, 13); |
| |
| for (j = 0; j < blk_cnt; j++) { |
| /* S_1 = e(AppKey, 0x01 || nonce || 0x0001) */ |
| sys_put_be16(j + 1, &a_i[14]); |
| |
| err = bt_encrypt_be(key, a_i, s_i); |
| if (err) { |
| return err; |
| } |
| |
| /* Encrypted = Payload[0-15] ^ C_1 */ |
| if (j < blk_cnt - 1) { |
| xor16(&out_msg[j * 16], s_i, &in_msg[j * 16]); |
| } else { |
| for (i = 0; i < last_blk; i++) { |
| out_msg[(j * 16) + i] = |
| in_msg[(j * 16) + i] ^ s_i[i]; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static int bt_mesh_ccm_decrypt(const u8_t key[16], u8_t nonce[13], |
| const u8_t *enc_msg, size_t msg_len, |
| const u8_t *aad, size_t aad_len, |
| u8_t *out_msg, size_t mic_size) |
| { |
| u8_t mic[16]; |
| |
| if (msg_len == 0 || aad_len >= 0xff00) { |
| return -EINVAL; |
| } |
| |
| ccm_crypt(key, nonce, enc_msg, out_msg, msg_len); |
| |
| ccm_auth(key, nonce, out_msg, msg_len, aad, aad_len, mic, mic_size); |
| |
| if (memcmp(mic, enc_msg + msg_len, mic_size)) { |
| return -EBADMSG; |
| } |
| |
| return 0; |
| } |
| |
| static int bt_mesh_ccm_encrypt(const u8_t key[16], u8_t nonce[13], |
| const u8_t *msg, size_t msg_len, |
| const u8_t *aad, size_t aad_len, |
| u8_t *out_msg, size_t mic_size) |
| { |
| u8_t *mic = out_msg + msg_len; |
| |
| BT_DBG("key %s", bt_hex(key, 16)); |
| BT_DBG("nonce %s", bt_hex(nonce, 13)); |
| BT_DBG("msg (len %zu) %s", msg_len, bt_hex(msg, msg_len)); |
| BT_DBG("aad_len %zu mic_size %zu", aad_len, mic_size); |
| |
| /* Unsupported AAD size */ |
| if (aad_len >= 0xff00) { |
| return -EINVAL; |
| } |
| |
| ccm_auth(key, nonce, out_msg, msg_len, aad, aad_len, mic, mic_size); |
| |
| ccm_crypt(key, nonce, msg, out_msg, msg_len); |
| |
| return 0; |
| } |
| |
| static void create_proxy_nonce(u8_t nonce[13], const u8_t *pdu, |
| u32_t iv_index) |
| { |
| /* Nonce Type */ |
| nonce[0] = 0x03; |
| |
| /* Pad */ |
| nonce[1] = 0x00; |
| |
| /* Sequence Number */ |
| nonce[2] = pdu[2]; |
| nonce[3] = pdu[3]; |
| nonce[4] = pdu[4]; |
| |
| /* Source Address */ |
| nonce[5] = pdu[5]; |
| nonce[6] = pdu[6]; |
| |
| /* Pad */ |
| nonce[7] = 0U; |
| nonce[8] = 0U; |
| |
| /* IV Index */ |
| sys_put_be32(iv_index, &nonce[9]); |
| } |
| |
| static void create_net_nonce(u8_t nonce[13], const u8_t *pdu, |
| u32_t iv_index) |
| { |
| /* Nonce Type */ |
| nonce[0] = 0x00; |
| |
| /* FRND + TTL */ |
| nonce[1] = pdu[1]; |
| |
| /* Sequence Number */ |
| nonce[2] = pdu[2]; |
| nonce[3] = pdu[3]; |
| nonce[4] = pdu[4]; |
| |
| /* Source Address */ |
| nonce[5] = pdu[5]; |
| nonce[6] = pdu[6]; |
| |
| /* Pad */ |
| nonce[7] = 0U; |
| nonce[8] = 0U; |
| |
| /* IV Index */ |
| sys_put_be32(iv_index, &nonce[9]); |
| } |
| |
| int bt_mesh_net_obfuscate(u8_t *pdu, u32_t iv_index, |
| const u8_t privacy_key[16]) |
| { |
| u8_t priv_rand[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, }; |
| u8_t tmp[16]; |
| int err, i; |
| |
| BT_DBG("IVIndex %u, PrivacyKey %s", iv_index, bt_hex(privacy_key, 16)); |
| |
| sys_put_be32(iv_index, &priv_rand[5]); |
| memcpy(&priv_rand[9], &pdu[7], 7); |
| |
| BT_DBG("PrivacyRandom %s", bt_hex(priv_rand, 16)); |
| |
| err = bt_encrypt_be(privacy_key, priv_rand, tmp); |
| if (err) { |
| return err; |
| } |
| |
| for (i = 0; i < 6; i++) { |
| pdu[1 + i] ^= tmp[i]; |
| } |
| |
| return 0; |
| } |
| |
| int bt_mesh_net_encrypt(const u8_t key[16], struct net_buf_simple *buf, |
| u32_t iv_index, bool proxy) |
| { |
| u8_t mic_len = NET_MIC_LEN(buf->data); |
| u8_t nonce[13]; |
| int err; |
| |
| BT_DBG("IVIndex %u EncKey %s mic_len %u", iv_index, bt_hex(key, 16), |
| mic_len); |
| BT_DBG("PDU (len %u) %s", buf->len, bt_hex(buf->data, buf->len)); |
| |
| if (IS_ENABLED(CONFIG_BT_MESH_PROXY) && proxy) { |
| create_proxy_nonce(nonce, buf->data, iv_index); |
| } else { |
| create_net_nonce(nonce, buf->data, iv_index); |
| } |
| |
| BT_DBG("Nonce %s", bt_hex(nonce, 13)); |
| |
| err = bt_mesh_ccm_encrypt(key, nonce, &buf->data[7], buf->len - 7, |
| NULL, 0, &buf->data[7], mic_len); |
| if (!err) { |
| net_buf_simple_add(buf, mic_len); |
| } |
| |
| return err; |
| } |
| |
| int bt_mesh_net_decrypt(const u8_t key[16], struct net_buf_simple *buf, |
| u32_t iv_index, bool proxy) |
| { |
| u8_t mic_len = NET_MIC_LEN(buf->data); |
| u8_t nonce[13]; |
| |
| BT_DBG("PDU (%u bytes) %s", buf->len, bt_hex(buf->data, buf->len)); |
| BT_DBG("iv_index %u, key %s mic_len %u", iv_index, bt_hex(key, 16), |
| mic_len); |
| |
| if (IS_ENABLED(CONFIG_BT_MESH_PROXY) && proxy) { |
| create_proxy_nonce(nonce, buf->data, iv_index); |
| } else { |
| create_net_nonce(nonce, buf->data, iv_index); |
| } |
| |
| BT_DBG("Nonce %s", bt_hex(nonce, 13)); |
| |
| buf->len -= mic_len; |
| |
| return bt_mesh_ccm_decrypt(key, nonce, &buf->data[7], buf->len - 7, |
| NULL, 0, &buf->data[7], mic_len); |
| } |
| |
| static void create_app_nonce(u8_t nonce[13], bool dev_key, u8_t aszmic, |
| u16_t src, u16_t dst, u32_t seq_num, |
| u32_t iv_index) |
| { |
| if (dev_key) { |
| nonce[0] = 0x02; |
| } else { |
| nonce[0] = 0x01; |
| } |
| |
| sys_put_be32((seq_num | ((u32_t)aszmic << 31)), &nonce[1]); |
| |
| sys_put_be16(src, &nonce[5]); |
| sys_put_be16(dst, &nonce[7]); |
| |
| sys_put_be32(iv_index, &nonce[9]); |
| } |
| |
| int bt_mesh_app_encrypt(const u8_t key[16], bool dev_key, u8_t aszmic, |
| struct net_buf_simple *buf, const u8_t *ad, |
| u16_t src, u16_t dst, u32_t seq_num, u32_t iv_index) |
| { |
| u8_t nonce[13]; |
| int err; |
| |
| BT_DBG("AppKey %s", bt_hex(key, 16)); |
| BT_DBG("dev_key %u src 0x%04x dst 0x%04x", dev_key, src, dst); |
| BT_DBG("seq_num 0x%08x iv_index 0x%08x", seq_num, iv_index); |
| BT_DBG("Clear: %s", bt_hex(buf->data, buf->len)); |
| |
| create_app_nonce(nonce, dev_key, aszmic, src, dst, seq_num, iv_index); |
| |
| BT_DBG("Nonce %s", bt_hex(nonce, 13)); |
| |
| err = bt_mesh_ccm_encrypt(key, nonce, buf->data, buf->len, ad, |
| ad ? 16 : 0, buf->data, APP_MIC_LEN(aszmic)); |
| if (!err) { |
| net_buf_simple_add(buf, APP_MIC_LEN(aszmic)); |
| BT_DBG("Encr: %s", bt_hex(buf->data, buf->len)); |
| } |
| |
| return err; |
| } |
| |
| int bt_mesh_app_decrypt(const u8_t key[16], bool dev_key, u8_t aszmic, |
| struct net_buf_simple *buf, struct net_buf_simple *out, |
| const u8_t *ad, u16_t src, u16_t dst, u32_t seq_num, |
| u32_t iv_index) |
| { |
| u8_t nonce[13]; |
| int err; |
| |
| BT_DBG("EncData (len %u) %s", buf->len, bt_hex(buf->data, buf->len)); |
| |
| create_app_nonce(nonce, dev_key, aszmic, src, dst, seq_num, iv_index); |
| |
| BT_DBG("AppKey %s", bt_hex(key, 16)); |
| BT_DBG("Nonce %s", bt_hex(nonce, 13)); |
| |
| err = bt_mesh_ccm_decrypt(key, nonce, buf->data, buf->len, ad, |
| ad ? 16 : 0, out->data, APP_MIC_LEN(aszmic)); |
| if (!err) { |
| net_buf_simple_add(out, buf->len); |
| } |
| |
| return err; |
| } |
| |
| /* reversed, 8-bit, poly=0x07 */ |
| static const u8_t crc_table[256] = { |
| 0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, |
| 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, |
| 0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, |
| 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, |
| |
| 0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, |
| 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, |
| 0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, |
| 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, |
| |
| 0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, |
| 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, |
| 0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, |
| 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, |
| |
| 0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, |
| 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, |
| 0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, |
| 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, |
| |
| 0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, |
| 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, |
| 0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, |
| 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, |
| |
| 0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, |
| 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, |
| 0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, |
| 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, |
| |
| 0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, |
| 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, |
| 0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, |
| 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, |
| |
| 0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, |
| 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, |
| 0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, |
| 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf |
| }; |
| |
| u8_t bt_mesh_fcs_calc(const u8_t *data, u8_t data_len) |
| { |
| u8_t fcs = 0xff; |
| |
| while (data_len--) { |
| fcs = crc_table[fcs ^ *data++]; |
| } |
| |
| BT_DBG("fcs 0x%02x", 0xff - fcs); |
| |
| return 0xff - fcs; |
| } |
| |
| bool bt_mesh_fcs_check(struct net_buf_simple *buf, u8_t received_fcs) |
| { |
| const u8_t *data = buf->data; |
| u16_t data_len = buf->len; |
| u8_t fcs = 0xff; |
| |
| while (data_len--) { |
| fcs = crc_table[fcs ^ *data++]; |
| } |
| |
| return crc_table[fcs ^ received_fcs] == 0xcf; |
| } |
| |
| int bt_mesh_virtual_addr(const u8_t virtual_label[16], u16_t *addr) |
| { |
| u8_t salt[16]; |
| u8_t tmp[16]; |
| int err; |
| |
| err = bt_mesh_s1("vtad", salt); |
| if (err) { |
| return err; |
| } |
| |
| err = bt_mesh_aes_cmac_one(salt, virtual_label, 16, tmp); |
| if (err) { |
| return err; |
| } |
| |
| *addr = (sys_get_be16(&tmp[14]) & 0x3fff) | 0x8000; |
| |
| return 0; |
| } |
| |
| int bt_mesh_prov_conf_salt(const u8_t conf_inputs[145], u8_t salt[16]) |
| { |
| const u8_t conf_salt_key[16] = { 0 }; |
| |
| return bt_mesh_aes_cmac_one(conf_salt_key, conf_inputs, 145, salt); |
| } |
| |
| int bt_mesh_prov_conf_key(const u8_t dhkey[32], const u8_t conf_salt[16], |
| u8_t conf_key[16]) |
| { |
| return bt_mesh_k1(dhkey, 32, conf_salt, "prck", conf_key); |
| } |
| |
| int bt_mesh_prov_conf(const u8_t conf_key[16], const u8_t rand[16], |
| const u8_t auth[16], u8_t conf[16]) |
| { |
| struct bt_mesh_sg sg[] = { { rand, 16 }, { auth, 16 } }; |
| |
| BT_DBG("ConfirmationKey %s", bt_hex(conf_key, 16)); |
| BT_DBG("RandomDevice %s", bt_hex(rand, 16)); |
| BT_DBG("AuthValue %s", bt_hex(auth, 16)); |
| |
| return bt_mesh_aes_cmac(conf_key, sg, ARRAY_SIZE(sg), conf); |
| } |
| |
| int bt_mesh_prov_decrypt(const u8_t key[16], u8_t nonce[13], |
| const u8_t data[25 + 8], u8_t out[25]) |
| { |
| return bt_mesh_ccm_decrypt(key, nonce, data, 25, NULL, 0, out, 8); |
| } |
| |
| int bt_mesh_prov_encrypt(const u8_t key[16], u8_t nonce[13], |
| const u8_t data[25], u8_t out[25 + 8]) |
| { |
| return bt_mesh_ccm_encrypt(key, nonce, data, 25, NULL, 0, out, 8); |
| } |
| |
| int bt_mesh_beacon_auth(const u8_t beacon_key[16], u8_t flags, |
| const u8_t net_id[8], u32_t iv_index, |
| u8_t auth[8]) |
| { |
| u8_t msg[13], tmp[16]; |
| int err; |
| |
| BT_DBG("BeaconKey %s", bt_hex(beacon_key, 16)); |
| BT_DBG("NetId %s", bt_hex(net_id, 8)); |
| BT_DBG("IV Index 0x%08x", iv_index); |
| |
| msg[0] = flags; |
| memcpy(&msg[1], net_id, 8); |
| sys_put_be32(iv_index, &msg[9]); |
| |
| BT_DBG("BeaconMsg %s", bt_hex(msg, sizeof(msg))); |
| |
| err = bt_mesh_aes_cmac_one(beacon_key, msg, sizeof(msg), tmp); |
| if (!err) { |
| memcpy(auth, tmp, 8); |
| } |
| |
| return err; |
| } |