tate_precompute_g2.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2020-2021 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2020-2021 Nikita Kaskov <nbering@nil.foundation>
//
// MIT License
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#ifndef CRYPTO3_ALGEBRA_PAIRING_EDWARDS_183_TATE_PRECOMPUTE_G2_HPP
#define CRYPTO3_ALGEBRA_PAIRING_EDWARDS_183_TATE_PRECOMPUTE_G2_HPP
 
#include <nil/crypto3/algebra/curves/edwards.hpp>
#include <nil/crypto3/algebra/pairing/detail/edwards/183/types.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace algebra {
            namespace pairing {
 
                template<std::size_t Version = 183>
                class edwards_ate_precompute_g1;
 
                template<>
                class edwards_ate_precompute_g1<183> {
                    using curve_type = curves::edwards<183>;
 
                    typedef detail::types_policy<curve_type> policy_type;
 
                    using g2_type = typename curve_type::template g2_type<>;
                    using g2_affine_type = typename curve_type::template g2_type<curves::coordinates::affine>;
 
                public:
                    using g2_precomputed_type = typename policy_type::tate_g2_precomp;
 
                    static typename policy_type::tate_g2_precomp process(const typename g2_type::value_type &P) {
 
                        typename g2_affine_type::value_type Qcopy = Q.to_affine();
                        typename policy_type::tate_g2_precomp result;
                        result.y0 = Qcopy.Y * Qcopy.Z.inversed();
                        result.eta = (Qcopy.Z + Qcopy.Y) * gt::mul_by_non_residue(Qcopy.X).inversed();
 
                        return result;
                    }
                };
            }    // namespace pairing
        }        // namespace algebra
    }            // namespace crypto3
}    // namespace nil
#endif    // CRYPTO3_ALGEBRA_PAIRING_EDWARDS_183_TATE_PRECOMPUTE_G2_HPP