108 lines
4 KiB
C++
108 lines
4 KiB
C++
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/// @file dpf/factory_tapes.hpp
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/// @brief Dealer stream layouts for `factory_gadgets` online tapes (A2B, trunc, GT).
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#ifndef LIBDPF_INCLUDE_DPF_FACTORY_TAPES_HPP__
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#define LIBDPF_INCLUDE_DPF_FACTORY_TAPES_HPP__
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#include <cstddef>
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#include <cstdint>
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#include <stdexcept>
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#include <type_traits>
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#include <utility>
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#include "dpf/protocol_factory.hpp"
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namespace dpf
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{
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namespace factory
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{
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namespace detail
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{
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inline std::pair<gmw_and_blind, gmw_and_blind> deal_gmw_and_blind_pair()
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{
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auto t = deal_bit_triple();
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gmw_and_blind v0{t.first.a, t.first.b, t.first.c};
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gmw_and_blind v1{t.second.a, t.second.b, t.second.c};
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return {v0, v1};
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}
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template <typename F>
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inline void deal_tape_pod(net::stream_array & party0, net::stream_array & party1,
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std::size_t stream, std::size_t count, F && f)
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{
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if (stream >= party0.size() || stream >= party1.size())
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throw std::invalid_argument("deal_tape_pod: stream index");
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for (std::size_t j = 0; j < count; ++j)
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{
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auto views = f();
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using V0 = std::decay_t<decltype(views.first)>;
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using V1 = std::decay_t<decltype(views.second)>;
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static_assert(std::is_trivially_copyable_v<V0>
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&& std::is_trivially_copyable_v<V1>,
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"deal_tape_pod views must be trivially copyable");
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if (sizeof(V0) != sizeof(V1))
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throw std::logic_error("deal_tape_pod: unequal view sizes");
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detail::write_pod(party0, stream, views.first);
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detail::write_pod(party1, stream, views.second);
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}
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party0.flush(stream);
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party1.flush(stream);
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}
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} // namespace detail
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/// @brief Sequential dabits then AND blinds for one `a2b_online` pass.
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inline void deal_a2b_tape(unsigned width, std::uint16_t limb,
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net::stream_array & party0, net::stream_array & party1,
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std::size_t dabit_stream = 0, std::size_t and_blind_stream = 1)
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{
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if (width == 0 || width > 64)
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throw std::invalid_argument("deal_a2b_tape width");
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const std::size_t need =
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1 + (dabit_stream > and_blind_stream ? dabit_stream : and_blind_stream);
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if (party0.size() < need || party1.size() < need)
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throw std::invalid_argument("deal_a2b_tape: not enough streams");
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detail::deal_tape_pod(party0, party1, dabit_stream, width,
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[limb] { return deal_dabit(limb); });
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detail::deal_tape_pod(party0, party1, and_blind_stream, width,
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[] { return detail::deal_gmw_and_blind_pair(); });
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}
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/// @brief `s + 1` dabits (low mask + B2A wrap) and `s` AND blinds for trunc.
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inline void deal_trunc_tape(unsigned n, unsigned s, std::uint16_t limb,
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net::stream_array & party0, net::stream_array & party1,
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std::size_t dabit_stream = 0, std::size_t and_blind_stream = 1)
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{
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if (s >= n || n > 64)
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throw std::invalid_argument("deal_trunc_tape");
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const std::size_t need =
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1 + (dabit_stream > and_blind_stream ? dabit_stream : and_blind_stream);
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if (party0.size() < need || party1.size() < need)
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throw std::invalid_argument("deal_trunc_tape: not enough streams");
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detail::deal_tape_pod(party0, party1, dabit_stream, s + 1u,
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[limb] { return deal_dabit(limb); });
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detail::deal_tape_pod(party0, party1, and_blind_stream, s,
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[] { return detail::deal_gmw_and_blind_pair(); });
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}
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/// @brief Dealer layout for `gt_online`: streams 0–1 (x A2B), 2–3 (y), 4 compare.
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inline void deal_gt_tape(unsigned width, std::uint16_t limb,
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net::stream_array & party0, net::stream_array & party1)
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{
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if (width == 0 || width > 64)
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throw std::invalid_argument("deal_gt_tape width");
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constexpr std::size_t k_gt_streams = 5;
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if (party0.size() < k_gt_streams || party1.size() < k_gt_streams)
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throw std::invalid_argument("deal_gt_tape: need 5 dealer streams");
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deal_a2b_tape(width, limb, party0, party1, 0, 1);
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deal_a2b_tape(width, limb, party0, party1, 2, 3);
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detail::deal_tape_pod(party0, party1, 4, 3u * width,
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[] { return detail::deal_gmw_and_blind_pair(); });
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}
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} // namespace factory
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} // namespace dpf
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#endif
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