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