accumulators/verify_share.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2021 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2021 Ilias Khairullin <ilias@nil.foundation>
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_ACCUMULATORS_PUBKEY_SSS_VERIFY_SHARE_HPP
#define CRYPTO3_ACCUMULATORS_PUBKEY_SSS_VERIFY_SHARE_HPP
 
#include <set>
#include <utility>
#include <algorithm>
#include <iterator>
 
#include <boost/concept_check.hpp>
 
#include <boost/accumulators/framework/accumulator_base.hpp>
#include <boost/accumulators/framework/parameters/sample.hpp>
 
#include <nil/crypto3/pubkey/accumulators/parameters/threshold_value.hpp>
#include <nil/crypto3/pubkey/accumulators/parameters/iterator_last.hpp>
 
#include <nil/crypto3/pubkey/secret_sharing/feldman.hpp>
// #include <nil/crypto3/pubkey/secret_sharing/pedersen.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace pubkey {
            namespace accumulators {
                namespace impl {
                    template<typename ProcessingMode, typename = void>
                    struct verify_share_impl;
 
                    template<typename ProcessingMode>
                    struct verify_share_impl<ProcessingMode> : boost::accumulators::accumulator_base {
                    protected:
                        typedef ProcessingMode processing_mode_type;
                        typedef typename processing_mode_type::scheme_type scheme_type;
                        typedef typename processing_mode_type::op_type op_type;
                        typedef typename processing_mode_type::internal_accumulator_type internal_accumulator_type;
 
                    public:
                        typedef typename processing_mode_type::result_type result_type;
 
                        //
                        // boost::accumulators::sample -- verified public (or private) share
                        //
                        template<typename Args>
                        verify_share_impl(const Args &args) :
                            verified_public_share(args[boost::accumulators::sample]), seen_coeffs(0) {
                            // TODO: replace with rvalue
                            // TODO: init accumulator without default constructor
                            auto i = verified_public_share.get_index();
                            processing_mode_type::init_accumulator(acc, i);
                        }
 
                        //
                        // boost::accumulators::sample -- public polynomial coefficients
                        // input coefficients should be supplied in increasing term degrees order
                        //
                        template<typename Args>
                        inline void operator()(const Args &args) {
                            resolve_type(args[boost::accumulators::sample],
                                         args[::nil::crypto3::accumulators::iterator_last | nullptr]);
                        }
 
                        inline result_type result(boost::accumulators::dont_care) const {
                            return processing_mode_type::process(acc, verified_public_share);
                        }
 
                    protected:
                        inline void resolve_type(const typename scheme_type::public_coeff_type &public_coeff,
                                                 std::nullptr_t = nullptr) {
                            processing_mode_type::update(acc, seen_coeffs, public_coeff);
                            seen_coeffs++;
                        }
 
                        template<typename InputRange>
                        inline void resolve_type(const InputRange &range, std::nullptr_t) {
                            for (const auto &pc : range) {
                                resolve_type(pc);
                            }
                        }
 
                        template<typename InputIterator>
                        inline void resolve_type(InputIterator first, InputIterator last) {
                            for (auto it = first; it != last; it++) {
                                resolve_type(*it);
                            }
                        }
 
                        std::size_t seen_coeffs;
                        public_share_sss<scheme_type> verified_public_share;
                        mutable internal_accumulator_type acc;
                    };
                }    // namespace impl
 
                namespace tag {
                    template<typename ProcessingMode>
                    struct verify_share : boost::accumulators::depends_on<> {
                        typedef ProcessingMode mode_type;
 
 
                        typedef boost::mpl::always<accumulators::impl::verify_share_impl<mode_type>> impl;
                    };
                }    // namespace tag
 
                namespace extract {
                    template<typename ProcessingMode, typename AccumulatorSet>
                    typename boost::mpl::apply<AccumulatorSet, tag::verify_share<ProcessingMode>>::type::result_type
                        verify_share(const AccumulatorSet &acc) {
                        return boost::accumulators::extract_result<tag::verify_share<ProcessingMode>>(acc);
                    }
                }    // namespace extract
            }        // namespace accumulators
        }            // namespace pubkey
    }                // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_ACCUMULATORS_PUBKEY_SSS_VERIFY_SHARE_HPP