arduino-esp32/tools/sdk/include/protocomm/protocomm_security.h

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// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <esp_err.h>
/**
* @brief Proof Of Possession for authenticating a secure session
*/
typedef struct protocomm_security_pop {
/**
* Pointer to buffer containing the proof of possession data
*/
const uint8_t *data;
/**
* Length (in bytes) of the proof of possession data
*/
uint16_t len;
} protocomm_security_pop_t;
/**
* @brief Protocomm security object structure.
*
* The member functions are used for implementing secure
* protocomm sessions.
*
* @note This structure should not have any dynamic
* members to allow re-entrancy
*/
typedef struct protocomm_security {
/**
* Unique version number of security implmentation
*/
int ver;
/**
* Function for initialising/allocating security
* infrastructure
*/
esp_err_t (*init)();
/**
* Function for deallocating security infrastructure
*/
esp_err_t (*cleanup)();
/**
* Starts new secure transport session with specified ID
*/
esp_err_t (*new_transport_session)(uint32_t session_id);
/**
* Closes a secure transport session with specified ID
*/
esp_err_t (*close_transport_session)(uint32_t session_id);
/**
* Handler function for authenticating connection
* request and establishing secure session
*/
esp_err_t (*security_req_handler)(const protocomm_security_pop_t *pop,
uint32_t session_id,
const uint8_t *inbuf, ssize_t inlen,
uint8_t **outbuf, ssize_t *outlen,
void *priv_data);
/**
* Function which implements the encryption algorithm
*/
esp_err_t (*encrypt)(uint32_t session_id,
const uint8_t *inbuf, ssize_t inlen,
uint8_t *outbuf, ssize_t *outlen);
/**
* Function which implements the decryption algorithm
*/
esp_err_t (*decrypt)(uint32_t session_id,
const uint8_t *inbuf, ssize_t inlen,
uint8_t *outbuf, ssize_t *outlen);
} protocomm_security_t;