accountable_roster.hpp

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// Copyright (c) 2026 Judica, Inc.
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://opensource.org/license/mit/.
 
#pragma once
 
#include <array>
#include <span>
#include <vector>
 
#include "purify/numeric.hpp"
 
namespace purify::accountable {

struct SigningRosterMember {
    std::array<unsigned char, 33> public_key;
    FieldElement coefficient;
};

class SigningRoster {
public:
    [[nodiscard]] static Result<SigningRoster> aggregate(
        std::span<const std::array<unsigned char, 33>> ordered_public_keys,
        purify_secp_context* secp_context);

    [[nodiscard]] std::span<const SigningRosterMember> members() const { return members_; }

    [[nodiscard]] const std::array<unsigned char, 32>& signing_key() const { return signing_key_; }

    [[nodiscard]] const std::array<unsigned char, 32>& key_list_hash() const { return key_list_hash_; }

    [[nodiscard]] bool aggregate_was_negated() const { return aggregate_was_negated_; }
 
private:
    SigningRoster() = default;
 
    std::vector<SigningRosterMember> members_;
    std::array<unsigned char, 32> signing_key_{};
    std::array<unsigned char, 32> key_list_hash_{};
    bool aggregate_was_negated_ = false;
};
 
} // namespace purify::accountable