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secure_session.hpp
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secure_session.hpp
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/*
* Copyright (c) 2015 Cossack Labs Limited
*
* 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.
*/
#ifndef THEMISPP_SECURE_SESSION_HPP_
#define THEMISPP_SECURE_SESSION_HPP_
#include <cstring>
#include <vector>
#include <themis/themis.h>
#include "exception.hpp"
#define THEMISPP_SECURE_SESSION_MAX_MESSAGE_SIZE 2048
namespace themispp{
class secure_session_callback_interface_t{
public:
typedef std::vector<uint8_t> data_t;
virtual const data_t get_pub_key_by_id(const data_t& id)=0;
virtual void send(const data_t& data){throw themispp::exception_t("Secure Session failed sending, send callback not set");}
virtual const data_t& receive(){throw themispp::exception_t("Secure Session failed receiving, receive callback not set");}
};
ssize_t send_callback(const uint8_t* data, size_t data_length, void *user_data){
try{
((secure_session_callback_interface_t*)user_data)->send(std::vector<uint8_t>((uint8_t*)data, (uint8_t*)data+data_length));
}catch(...){return -1;}
return ssize_t(data_length);
}
ssize_t receive_callback(uint8_t* data, size_t data_length, void *user_data){
try{
std::vector<uint8_t> received_data=((secure_session_callback_interface_t*)user_data)->receive();
memcpy(data, &received_data[0], received_data.size());
return ssize_t(received_data.size());
}catch(...){}
return -1;
}
int get_public_key_for_id_callback(const void *id, size_t id_length, void *key_buffer, size_t key_buffer_length, void *user_data){
std::vector<uint8_t> pubk=((secure_session_callback_interface_t*)user_data)->get_pub_key_by_id(std::vector<uint8_t>(static_cast<const uint8_t*>(id), static_cast<const uint8_t*>(id)+id_length));
if(pubk.size()>key_buffer_length){
return THEMIS_BUFFER_TOO_SMALL;
}
std::memcpy(key_buffer, &pubk[0], pubk.size());
return THEMIS_SUCCESS;
}
class secure_session_t{
public:
typedef std::vector<uint8_t> data_t;
secure_session_t():
_session(NULL),
_callback(NULL){
}
secure_session_t(const data_t& id, const data_t& priv_key, secure_session_callback_interface_t* callbacks):
_session(NULL),
_callback(NULL),
_res(0){
_callback=new secure_session_user_callbacks_t();
_callback->get_public_key_for_id=themispp::get_public_key_for_id_callback;
_callback->send_data=themispp::send_callback;
_callback->receive_data=themispp::receive_callback;
_callback->state_changed=NULL;
_callback->user_data=callbacks;
_session=secure_session_create(&id[0], id.size(), &priv_key[0], priv_key.size(), _callback);
if(!_session){
delete _callback;
throw themispp::exception_t("Secure Session failed creating");
}
}
virtual ~secure_session_t(){
if(_session){
secure_session_destroy(_session);
_session=NULL;
}
delete _callback;
_callback=NULL;
}
#if __cplusplus >= 201103L
secure_session_t(const secure_session_t&) = delete;
secure_session_t& operator=(const secure_session_t&) = delete;
secure_session_t(secure_session_t&& other){
_session=other._session;
_callback=other._callback;
_res=other._res;
other._session=nullptr;
other._callback=nullptr;
}
secure_session_t& operator=(secure_session_t&& other){
if(this!=&other){
if(_session){
secure_session_destroy(_session);
}
delete _callback;
_session=other._session;
_callback=other._callback;
_res=other._res;
other._session=nullptr;
other._callback=nullptr;
}
return *this;
}
#else
private:
secure_session_t(const secure_session_t&);
secure_session_t& operator=(const secure_session_t&);
public:
#endif
const data_t& unwrap(const std::vector<uint8_t>& data){
if(!_session){
throw themispp::exception_t("uninitialized Secure Session");
}
size_t unwrapped_data_length=0;
themis_status_t r=secure_session_unwrap(_session, &data[0],data.size(), NULL, &unwrapped_data_length);
if(r==THEMIS_SUCCESS){_res.resize(0); return _res;}
if(r!=THEMIS_BUFFER_TOO_SMALL)
throw themispp::exception_t("Secure Session failed decrypting");
_res.resize(unwrapped_data_length);
r=secure_session_unwrap(_session, &data[0],data.size(), &_res[0], &unwrapped_data_length);
if(r==THEMIS_SSESSION_SEND_OUTPUT_TO_PEER){return _res;}
if(r!=THEMIS_SUCCESS)
throw themispp::exception_t("Secure Session failed decrypting");
return _res;
}
const data_t& wrap(const std::vector<uint8_t>& data){
if(!_session){
throw themispp::exception_t("uninitialized Secure Session");
}
size_t wrapped_message_length=0;
if(secure_session_wrap(_session, &data[0], data.size(), NULL, &wrapped_message_length)!=THEMIS_BUFFER_TOO_SMALL)
throw themispp::exception_t("Secure Session failed encrypting");
_res.resize(wrapped_message_length);
if(secure_session_wrap(_session, &data[0], data.size(), &_res[0], &wrapped_message_length)!=THEMIS_SUCCESS)
throw themispp::exception_t("Secure Session failed encrypting");
return _res;
}
const data_t& init(){
if(!_session){
throw themispp::exception_t("uninitialized Secure Session");
}
size_t init_data_length=0;
if(secure_session_generate_connect_request(_session, NULL, &init_data_length)!=THEMIS_BUFFER_TOO_SMALL)
throw themispp::exception_t("Secure Session failed making connection request");
_res.resize(init_data_length);
if(secure_session_generate_connect_request(_session, &_res.front(), &init_data_length)!=THEMIS_SUCCESS)
throw themispp::exception_t("Secure Session failed making connection request");
return _res;
}
const bool is_established(){
if(!_session){
throw themispp::exception_t("uninitialized Secure Session");
}
return secure_session_is_established(_session);
}
void connect(){
if(!_session){
throw themispp::exception_t("uninitialized Secure Session");
}
if(secure_session_connect(_session)!=THEMIS_SUCCESS)
throw themispp::exception_t("Secure Session failed connecting");
}
const data_t& receive(){
if(!_session){
throw themispp::exception_t("uninitialized Secure Session");
}
_res.resize(THEMISPP_SECURE_SESSION_MAX_MESSAGE_SIZE);
ssize_t recv_size=secure_session_receive(_session, &_res[0], _res.size());
if(recv_size<=0)
throw themispp::exception_t("Secure Session failed receiving");
_res.resize(recv_size);
return _res;
}
void send(const data_t& data){
if(!_session){
throw themispp::exception_t("uninitialized Secure Session");
}
ssize_t send_size=secure_session_send(_session, &data[0], data.size());
if(send_size<=0)
throw themispp::exception_t("Secure Session failed sending");
}
private:
::secure_session_t* _session;
::secure_session_user_callbacks_t *_callback;
std::vector<uint8_t> _res;
};
}// ns themis
#endif