lime_keys.hpp

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/*
    lime_keys.hpp
    @author Johan Pascal
    @copyright  Copyright (C) 2017  Belledonne Communications SARL

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef lime_keys_hpp
#define lime_keys_hpp

#include <algorithm> //std::copy_n
#include <array>
#include <iterator>
#include "lime/lime.hpp"

namespace lime {
    // Data structure type enumerations
    enum class Xtype {publicKey, privateKey, sharedSecret};
    enum class DSAtype {publicKey, privateKey, signature};

    /* define needed constant for the curves: self identificatio(used in DB and as parameter from lib users, data structures sizes)*/
    /* These structure are used as template argument to enable support for different key Exchznge and signature Algorithms */

    struct C255 {
        static constexpr lime::CurveId curveId() {return lime::CurveId::c25519;};
        static constexpr size_t Xsize(lime::Xtype dataType) {return 32;};
        static constexpr size_t DSAsize(lime::DSAtype dataType) {return (dataType != lime::DSAtype::signature)?32:64;};
    };

    struct C448 {
        static constexpr lime::CurveId curveId() {return lime::CurveId::c448;};
        static constexpr size_t Xsize(lime::Xtype dataType) {return 56;};
        static constexpr size_t DSAsize(lime::DSAtype dataType) {return (dataType != lime::DSAtype::signature)?57:114;};
    };

    // Hash function defines
    struct SHA512 {
        static constexpr size_t ssize() {return 64;}
    };

    // AEAD function defines
    struct AES256GCM {
        static constexpr size_t keySize(void) {return 32;};
        static constexpr size_t tagSize(void) {return 16;};
    };
}

#endif /* lime_keys_hpp */