MessageWriter.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_MESSAGEWRITER_H
#define SALTPACK_MESSAGEWRITER_H
 
#include <list>
#include "Base.h"
 
namespace saltpack {
 
    class MessageWriter : public Base {
 
    public:
        MessageWriter(std::ostream &os, BYTE_ARRAY senderSecretkey, const std::list<BYTE_ARRAY>& recipients,
                      bool visibleRecipients);
 
        MessageWriter(std::ostream &os, BYTE_ARRAY senderSecretkey, const std::list<BYTE_ARRAY>& recipients);
 
        MessageWriter(std::ostream &os, const std::list<BYTE_ARRAY>& recipients, bool visibleRecipients);
 
        MessageWriter(std::ostream &os, const std::list<BYTE_ARRAY>& recipients);
 
        MessageWriter(std::ostream &os, const BYTE_ARRAY& senderSecretkey, bool detatchedSignature);
 
        MessageWriter(std::ostream &os, const BYTE_ARRAY& senderSecretkey, const std::list<BYTE_ARRAY>& recipientsPublickeys,
                      const std::list<std::pair<BYTE_ARRAY, BYTE_ARRAY>>& symmetricKeys);
 
        MessageWriter(std::ostream &os, const std::list<BYTE_ARRAY>& recipientsPublickeys,
                      const std::list<std::pair<BYTE_ARRAY, BYTE_ARRAY>>& symmetricKeys);
 
        ~MessageWriter() override;
 
        void addBlock(BYTE_ARRAY data, bool final);
 
    private:
        std::ostream &output;
        unsigned long packetIndex;
        BYTE_ARRAY payloadKey;
        BYTE_ARRAY headerHash;
        std::list<BYTE_ARRAY> macKeys;
        bool lastBlockAdded;
 
        BYTE_ARRAY secretKey;
        BYTE_ARRAY buffer;
 
        std::string generateEncryptionHeader(BYTE_ARRAY ephemeralSecretkey, BYTE_ARRAY ephemeralPublickey,
                                             BYTE_ARRAY senderPublickey, const std::list<BYTE_ARRAY>& recipientsPublickeys,
                                             bool visibleRecipients);
 
        static std::string generateSignatureHeader(BYTE_ARRAY senderPublickey, bool detatchedSignature);
 
        std::string generateSigncryptionHeader(const BYTE_ARRAY& ephemeralSecretkey, const BYTE_ARRAY& ephemeralPublickey,
                                               BYTE_ARRAY senderPublickey, const std::list<BYTE_ARRAY>& recipientsPublickeys,
                                               const std::list<std::pair<BYTE_ARRAY, BYTE_ARRAY>>& symmetricKeys);
 
        static std::string encodeHeader(const std::string& header);
 
        static BYTE_ARRAY generateAuthenticator(BYTE_ARRAY concat, BYTE_ARRAY recipientMacKey);
 
        std::string generatePayloadPacket(BYTE_ARRAY message, bool final);
 
        std::string generateSignaturePayloadPacket(const BYTE_ARRAY& message, bool final);
 
        std::string generateSigncryptionPayloadPacket(BYTE_ARRAY message, bool final);
    };
}
 
#endif //SALTPACK_MESSAGEWRITER_H