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110 lines
4.1 KiB
110 lines
4.1 KiB
// Copyright (c) 2021-2022, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include "crypto/crypto.h"
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#include <cstdint>
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#include <vector>
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namespace multisig
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{
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////
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// multisig key exchange message
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// - can parse and validate an input message
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// - can construct and sign a new message
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//
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// msg_content = kex_round | signing_pubkey | expand(msg_pubkeys) | OPTIONAL msg_privkey
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// msg_to_sign = versioning-domain-sep | msg_content
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// msg = versioning-domain-sep | b58(msg_content | crypto_sig[signing_privkey](msg_to_sign))
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//
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// note: round 1 messages will contain a private key (e.g. for the aggregate multisig private view key)
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///
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class multisig_kex_msg final
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{
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//member types: none
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//constructors
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public:
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// default constructor
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multisig_kex_msg() = default;
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// construct from info
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multisig_kex_msg(const std::uint32_t round,
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const crypto::secret_key &signing_privkey,
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std::vector<crypto::public_key> msg_pubkeys,
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const crypto::secret_key &msg_privkey = crypto::null_skey);
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// construct from string
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multisig_kex_msg(std::string msg);
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// copy constructor: default
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//destructor: default
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~multisig_kex_msg() = default;
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//overloaded operators: none
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//member functions
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// get msg string
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const std::string& get_msg() const { return m_msg; }
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// get kex round
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std::uint32_t get_round() const { return m_kex_round; }
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// get msg pubkeys
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const std::vector<crypto::public_key>& get_msg_pubkeys() const { return m_msg_pubkeys; }
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// get msg privkey
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const crypto::secret_key& get_msg_privkey() const { return m_msg_privkey; }
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// get msg signing pubkey
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const crypto::public_key& get_signing_pubkey() const { return m_signing_pubkey; }
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private:
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// msg_to_sign = versioning-domain-sep | kex_round | signing_pubkey | expand(msg_pubkeys) | OPTIONAL msg_privkey
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crypto::hash get_msg_to_sign() const;
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// set: msg string based on msg contents, signing pubkey based on input privkey
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void construct_msg(const crypto::secret_key &signing_privkey);
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// parse msg string into parts, validate contents and signature
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void parse_and_validate_msg();
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//member variables
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private:
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// message as string
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std::string m_msg;
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// key exchange round this msg was produced for
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std::uint32_t m_kex_round;
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// pubkeys stored in msg
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std::vector<crypto::public_key> m_msg_pubkeys;
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// privkey stored in msg (if kex round 1)
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crypto::secret_key m_msg_privkey;
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// pubkey used to sign this msg
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crypto::public_key m_signing_pubkey;
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};
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} //namespace multisig
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