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/*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/pcurves_instance.h>
#include <botan/internal/pcurves_wrap.h>
namespace Botan::PCurve {
namespace {
namespace {{ curve["Name"] }} {
{% if crandall > 0 -%}
template <typename Params>
class {{ curve["Name"] | capitalize }}Rep final {
public:
static constexpr auto P = Params::P;
static constexpr size_t N = Params::N;
typedef typename Params::W W;
static constexpr W C = {{ crandall }};
constexpr static std::array<W, N> one() { return std::array<W, N>{1}; }
constexpr static std::array<W, N> redc(const std::array<W, 2 * N>& z) {
return redc_crandall<W, N, C>(std::span{z});
}
constexpr static std::array<W, N> to_rep(const std::array<W, N>& x) { return x; }
constexpr static std::array<W, N> wide_to_rep(const std::array<W, 2 * N>& x) { return redc(x); }
constexpr static std::array<W, N> from_rep(const std::array<W, N>& z) { return z; }
};
{% endif %}
// clang-format off
class Params final : public EllipticCurveParameters<
"{{ "%X" % curve['P'] }}",
"{{ "%X" % curve['A'] }}",
"{{ "%X" % curve['B'] }}",
"{{ "%X" % curve['N'] }}",
"{{ "%X" % curve['X'] }}",
"{{ "%X" % curve['Y'] }}"> {
};
// clang-format on
class Curve final : public EllipticCurve<Params{% if crandall > 0 %}, {{ curve["Name"] | capitalize}}Rep{% endif %}> {
public:
// Return the square of the inverse of x
static constexpr FieldElement fe_invert2(const FieldElement& x) {
{{ addchain_fe2 }}
}
{% if addchain_fe_sqrt != None -%}
// Return the square root of this field element (if it is a quadratic residue)
static constexpr FieldElement fe_sqrt(const FieldElement& x) {
{{ addchain_fe_sqrt }}
}
{%- endif %}
// Return the inverse of an integer modulo the order
static constexpr Scalar scalar_invert(const Scalar& x) {
{{ addchain_scalar }}
}
};
} // namespace {{ curve["Name"] }}
} // namespace
std::shared_ptr<const PrimeOrderCurve> PCurveInstance::{{ curve["Name"] }}() {
return PrimeOrderCurveImpl<{{ curve["Name"] }}::Curve>::instance();
}
} // namespace Botan::PCurve