symmetric_encryption.h

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/*
-------------------------------------------------------------------------------
                            PLEBBLE
-------------------------------------------------------------------------------
 Copyright (C) 2019-2020 KATLAS Technology. (http://katlastechnology.com)
 Copyright (C) 2017-2020 Marcos Mayorga. (mm@mm-studios.com)
 
 This file is part of our Plebble(R) Platform.
 
 The code below cannot be copied, used for any purpose other than the one
 agreed and/or distributed without the express permission of
 KATLAS Technology.
-------------------------------------------------------------------------------
 
 
*/
#ifndef USGOV_d849d1a13db50de2445a34619f728b452c00b4067ae57c05409fe800ef621994
#define USGOV_d849d1a13db50de2445a34619f728b452c00b4067ae57c05409fe800ef621994
 
#include <iostream>
#include <string>
#include "ec.h"
#include <stdio.h>
#include <us/gov/config.h>
#include <crypto++/gcm.h>
#include <crypto++/aes.h>
#include <crypto++/osrng.h>
 
namespace us { namespace gov {
namespace crypto {
 
    using namespace std;
    using CryptoPP::AutoSeededRandomPool;
    using CryptoPP::GCM;
    using CryptoPP::AES;
 
    struct symmetric_encryption {
        typedef ec::keys keys;
        typedef unsigned char byte;
//        symmetric_encryption(const keys::priv_t&, const keys::pub_t&);
//        symmetric_encryption(const vector<unsigned char>&);
        ko init(const keys::priv_t& sk, const keys::pub_t& pub_other);
 
        ko encrypt(const vector<unsigned char>& src, vector<unsigned char>& dest);
        ko decrypt(const unsigned char* p, size_t sz, vector<unsigned char>& dest);
        ko decrypt(const vector<unsigned char>& ciphertext, vector<unsigned char>& clear);
        //bool decrypt(const vector<unsigned char>&, vector<unsigned char>&);
        static int encmsg_ratio(const size_t plaintext_sz);
        static size_t encmsg_max_sz(const size_t plaintext_sz);
 
        static constexpr size_t key_size = 16;
        static constexpr size_t iv_size = 12;
        static constexpr int tag_size = 16;
        AutoSeededRandomPool prng_;
        byte key_[key_size];
        byte iv_[iv_size];
//        unsigned char iv_[iv_size];
        
//        void set_iv_from_ciphertext(const vector<unsigned char>&, unsigned char* iv);
//        void set_iv_from_ciphertext(const unsigned char* p, size_t sz, unsigned char* iv);
 
        GCM<AES>::Encryption enc;
        GCM<AES>::Decryption dec;
    };
 
}
}}
#endif