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/*
* SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "esp_random.h"
#if CONFIG_BT_CONTROLLER_ENABLED || !CONFIG_BT_NIMBLE_ENABLED
#include "esp_bt.h"
#endif
#include "esp_blufi_api.h"
#include "blufi_example.h"
#include "mbedtls/aes.h"
#include "mbedtls/dhm.h"
#include "mbedtls/md5.h"
#include "esp_crc.h"
/*
The SEC_TYPE_xxx is for self-defined packet data type in the procedure of "BLUFI negotiate key"
If user use other negotiation procedure to exchange(or generate) key, should redefine the type by yourself.
*/
#define SEC_TYPE_DH_PARAM_LEN 0x00
#define SEC_TYPE_DH_PARAM_DATA 0x01
#define SEC_TYPE_DH_P 0x02
#define SEC_TYPE_DH_G 0x03
#define SEC_TYPE_DH_PUBLIC 0x04
struct blufi_security {
#define DH_SELF_PUB_KEY_LEN 128
uint8_t self_public_key[DH_SELF_PUB_KEY_LEN];
#define SHARE_KEY_LEN 128
uint8_t share_key[SHARE_KEY_LEN];
size_t share_len;
#define PSK_LEN 16
uint8_t psk[PSK_LEN];
uint8_t *dh_param;
int dh_param_len;
uint8_t iv[16];
mbedtls_dhm_context dhm;
mbedtls_aes_context aes;
};
static struct blufi_security *blufi_sec;
static int myrand( void *rng_state, unsigned char *output, size_t len )
{
esp_fill_random(output, len);
return( 0 );
}
extern void btc_blufi_report_error(esp_blufi_error_state_t state);
void blufi_dh_negotiate_data_handler(uint8_t *data, int len, uint8_t **output_data, int *output_len, bool *need_free)
{
if (data == NULL || len < 3) {
BLUFI_ERROR("BLUFI Invalid data format");
btc_blufi_report_error(ESP_BLUFI_DATA_FORMAT_ERROR);
return;
}
int ret;
uint8_t type = data[0];
if (blufi_sec == NULL) {
BLUFI_ERROR("BLUFI Security is not initialized");
btc_blufi_report_error(ESP_BLUFI_INIT_SECURITY_ERROR);
return;
}
switch (type) {
case SEC_TYPE_DH_PARAM_LEN:
blufi_sec->dh_param_len = ((data[1]<<8)|data[2]);
if (blufi_sec->dh_param) {
free(blufi_sec->dh_param);
blufi_sec->dh_param = NULL;
}
blufi_sec->dh_param = (uint8_t *)malloc(blufi_sec->dh_param_len);
if (blufi_sec->dh_param == NULL) {
blufi_sec->dh_param_len = 0; /* Reset length to avoid using unallocated memory */
btc_blufi_report_error(ESP_BLUFI_DH_MALLOC_ERROR);
BLUFI_ERROR("%s, malloc failed\n", __func__);
return;
}
break;
case SEC_TYPE_DH_PARAM_DATA:{
if (blufi_sec->dh_param == NULL) {
BLUFI_ERROR("%s, blufi_sec->dh_param == NULL\n", __func__);
btc_blufi_report_error(ESP_BLUFI_DH_PARAM_ERROR);
return;
}
if (len < (blufi_sec->dh_param_len + 1)) {
BLUFI_ERROR("%s, invalid dh param len\n", __func__);
btc_blufi_report_error(ESP_BLUFI_DH_PARAM_ERROR);
return;
}
uint8_t *param = blufi_sec->dh_param;
memcpy(blufi_sec->dh_param, &data[1], blufi_sec->dh_param_len);
ret = mbedtls_dhm_read_params(&blufi_sec->dhm, ¶m, ¶m[blufi_sec->dh_param_len]);
if (ret) {
BLUFI_ERROR("%s read param failed %d\n", __func__, ret);
btc_blufi_report_error(ESP_BLUFI_READ_PARAM_ERROR);
return;
}
free(blufi_sec->dh_param);
blufi_sec->dh_param = NULL;
const int dhm_len = mbedtls_dhm_get_len(&blufi_sec->dhm);
if (dhm_len > DH_SELF_PUB_KEY_LEN) {
BLUFI_ERROR("%s dhm len not support %d\n", __func__, dhm_len);
btc_blufi_report_error(ESP_BLUFI_DH_PARAM_ERROR);
return;
}
ret = mbedtls_dhm_make_public(&blufi_sec->dhm, dhm_len, blufi_sec->self_public_key, DH_SELF_PUB_KEY_LEN, myrand, NULL);
if (ret) {
BLUFI_ERROR("%s make public failed %d\n", __func__, ret);
btc_blufi_report_error(ESP_BLUFI_MAKE_PUBLIC_ERROR);
return;
}
ret = mbedtls_dhm_calc_secret( &blufi_sec->dhm,
blufi_sec->share_key,
SHARE_KEY_LEN,
&blufi_sec->share_len,
myrand, NULL);
if (ret) {
BLUFI_ERROR("%s mbedtls_dhm_calc_secret failed %d\n", __func__, ret);
btc_blufi_report_error(ESP_BLUFI_DH_PARAM_ERROR);
return;
}
ret = mbedtls_md5(blufi_sec->share_key, blufi_sec->share_len, blufi_sec->psk);
if (ret) {
BLUFI_ERROR("%s mbedtls_md5 failed %d\n", __func__, ret);
btc_blufi_report_error(ESP_BLUFI_CALC_MD5_ERROR);
return;
}
mbedtls_aes_setkey_enc(&blufi_sec->aes, blufi_sec->psk, PSK_LEN * 8);
/* alloc output data */
*output_data = &blufi_sec->self_public_key[0];
*output_len = dhm_len;
*need_free = false;
}
break;
case SEC_TYPE_DH_P:
break;
case SEC_TYPE_DH_G:
break;
case SEC_TYPE_DH_PUBLIC:
break;
}
}
int blufi_aes_encrypt(uint8_t iv8, uint8_t *crypt_data, int crypt_len)
{
int ret;
size_t iv_offset = 0;
uint8_t iv0[16];
if (!blufi_sec) {
return -1;
}
memcpy(iv0, blufi_sec->iv, sizeof(blufi_sec->iv));
iv0[0] = iv8; /* set iv8 as the iv0[0] */
ret = mbedtls_aes_crypt_cfb128(&blufi_sec->aes, MBEDTLS_AES_ENCRYPT, crypt_len, &iv_offset, iv0, crypt_data, crypt_data);
if (ret) {
return -1;
}
return crypt_len;
}
int blufi_aes_decrypt(uint8_t iv8, uint8_t *crypt_data, int crypt_len)
{
int ret;
size_t iv_offset = 0;
uint8_t iv0[16];
if (!blufi_sec) {
return -1;
}
memcpy(iv0, blufi_sec->iv, sizeof(blufi_sec->iv));
iv0[0] = iv8; /* set iv8 as the iv0[0] */
ret = mbedtls_aes_crypt_cfb128(&blufi_sec->aes, MBEDTLS_AES_DECRYPT, crypt_len, &iv_offset, iv0, crypt_data, crypt_data);
if (ret) {
return -1;
}
return crypt_len;
}
uint16_t blufi_crc_checksum(uint8_t iv8, uint8_t *data, int len)
{
/* This iv8 ignore, not used */
return esp_crc16_be(0, data, len);
}
esp_err_t blufi_security_init(void)
{
blufi_sec = (struct blufi_security *)malloc(sizeof(struct blufi_security));
if (blufi_sec == NULL) {
return ESP_FAIL;
}
memset(blufi_sec, 0x0, sizeof(struct blufi_security));
mbedtls_dhm_init(&blufi_sec->dhm);
mbedtls_aes_init(&blufi_sec->aes);
memset(blufi_sec->iv, 0x0, sizeof(blufi_sec->iv));
return 0;
}
void blufi_security_deinit(void)
{
if (blufi_sec == NULL) {
return;
}
if (blufi_sec->dh_param){
free(blufi_sec->dh_param);
blufi_sec->dh_param = NULL;
}
mbedtls_dhm_free(&blufi_sec->dhm);
mbedtls_aes_free(&blufi_sec->aes);
memset(blufi_sec, 0x0, sizeof(struct blufi_security));
free(blufi_sec);
blufi_sec = NULL;
}
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