subgroup_check.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2020-2021 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2020-2021 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
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_ALGEBRA_CURVES_SUBGROUP_CHECK_HPP
#define CRYPTO3_ALGEBRA_CURVES_SUBGROUP_CHECK_HPP
 
#include <nil/crypto3/algebra/type_traits.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace algebra {
            namespace curves {
                namespace detail {
                    // TODO: temporary implementation due to absence of GroupValueType type_trait
                    //  Should be implemented as class method
                    template<typename GroupValueType, typename = typename std::enable_if<
                                                          is_curve_group<typename GroupValueType::group_type>::value &&
                                                          !is_field<typename GroupValueType::group_type>::value>::type>
                    bool subgroup_check(const GroupValueType &p) {
                        return (p * GroupValueType::group_type::curve_type::q).is_zero();
                    }
                }    // namespace detail
            }        // namespace curves
        }            // namespace algebra
    }                // namespace crypto3
}    // namespace nil
#endif    // CRYPTO3_ALGEBRA_CURVES_SUBGROUP_CHECK_HPP