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// Copyright (c) 2021, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include "crypto/crypto.h"
#include <cstdint>
#include <vector>
namespace multisig
{
////
// multisig key exchange message
// - can parse and validate an input message
// - can construct and sign a new message
//
// msg_content = kex_round | signing_pubkey | expand(msg_pubkeys) | OPTIONAL msg_privkey
// msg_to_sign = versioning-domain-sep | msg_content
// msg = versioning-domain-sep | b58(msg_content | crypto_sig[signing_privkey](msg_to_sign))
//
// note: round 1 messages will contain a private key (e.g. for the aggregate multisig private view key)
///
class multisig_kex_msg final
{
//member types: none
//constructors
public:
// default constructor
multisig_kex_msg() = default;
// construct from info
multisig_kex_msg(const std::uint32_t round,
const crypto::secret_key &signing_privkey,
std::vector<crypto::public_key> msg_pubkeys,
const crypto::secret_key &msg_privkey = crypto::null_skey);
// construct from string
multisig_kex_msg(std::string msg);
// copy constructor: default
//destructor: default
~multisig_kex_msg() = default;
//overloaded operators: none
//member functions
// get msg string
const std::string& get_msg() const { return m_msg; }
// get kex round
std::uint32_t get_round() const { return m_kex_round; }
// get msg pubkeys
const std::vector<crypto::public_key>& get_msg_pubkeys() const { return m_msg_pubkeys; }
// get msg privkey
const crypto::secret_key& get_msg_privkey() const { return m_msg_privkey; }
// get msg signing pubkey
const crypto::public_key& get_signing_pubkey() const { return m_signing_pubkey; }
private:
// msg_to_sign = versioning-domain-sep | kex_round | signing_pubkey | expand(msg_pubkeys) | OPTIONAL msg_privkey
crypto::hash get_msg_to_sign() const;
// set: msg string based on msg contents, signing pubkey based on input privkey
void construct_msg(const crypto::secret_key &signing_privkey);
// parse msg string into parts, validate contents and signature
void parse_and_validate_msg();
//member variables
private:
// message as string
std::string m_msg;
// key exchange round this msg was produced for
std::uint32_t m_kex_round;
// pubkeys stored in msg
std::vector<crypto::public_key> m_msg_pubkeys;
// privkey stored in msg (if kex round 1)
crypto::secret_key m_msg_privkey;
// pubkey used to sign this msg
crypto::public_key m_signing_pubkey;
};
} //namespace multisig
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