MessageReader.h

/*
 * Copyright 2016-2024 Luca Zanconato
 *
 * 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 SALTPACK_MESSAGEREADER_H
#define SALTPACK_MESSAGEREADER_H
 
#include <msgpack.hpp>
#include "Base.h"
#include "PayloadPacket.h"
#include "PayloadPacketV2.h"
#include "SignaturePayloadPacket.h"
 
namespace saltpack {
 
    class MessageReader : public Base {
 
    public:
        MessageReader(std::istream &is, const BYTE_ARRAY& recipientSecretkey);
 
        explicit MessageReader(std::istream &is);
 
        MessageReader(std::istream &is, std::istream &messageStream);
 
        MessageReader(std::istream &is, const BYTE_ARRAY& recipientSecretkey, const std::pair<BYTE_ARRAY, BYTE_ARRAY>& symmetricKey);
 
        ~MessageReader() override;
 
        BYTE_ARRAY getBlock();
 
        bool hasMoreBlocks();
 
        std::list<BYTE_ARRAY> getRecipients();
 
        BYTE_ARRAY getSender();
 
        bool isIntentionallyAnonymous();
 
    private:
        BYTE_ARRAY headerHash;
        BYTE_ARRAY payloadKey;
        BYTE_ARRAY macKey;
        unsigned long recipientIndex{};
        std::list<BYTE_ARRAY> recipients;
        unsigned long packetIndex{};
        std::istream &input;
        msgpack::unpacker unpacker;
        bool lastBlockFound{};
        bool intentionallyAnonymous{};
        int majorVersion{};
        int minorVersion{};
 
        BYTE_ARRAY senderPublickey;
 
        void processEncryptionHeader(std::vector<char> headerBin, BYTE_ARRAY recipientSecretkey);
 
        void processSignatureHeader(std::vector<char> headerBin);
 
        void processSigncryptionHeader(std::vector<char> headerBin, const BYTE_ARRAY& recipientSecretkey,
                                       const std::pair<BYTE_ARRAY, BYTE_ARRAY>& symmetricKey);
 
        BYTE_ARRAY decryptPacket(std::vector<BYTE_ARRAY> authenticatorsList, BYTE_ARRAY payloadSecretbox, bool final);
 
        BYTE_ARRAY verifyPacket(BYTE_ARRAY signature, BYTE_ARRAY payloadChunk, bool final);
 
        BYTE_ARRAY decryptPacket(BYTE_ARRAY payloadSecretbox, bool final);
    };
}
 
#endif //SALTPACK_MESSAGEREADER_H