Botan::EC_AffinePoint_Data_PC Class Reference

#include <ec_inner_pc.h>

Inheritance diagram for Botan::EC_AffinePoint_Data_PC:

Public Member Functions
std::unique_ptr< EC_AffinePoint_Data >	clone () const override
	EC_AffinePoint_Data_PC (std::shared_ptr< const EC_Group_Data > group, PCurve::PrimeOrderCurve::AffinePoint pt)
	EC_AffinePoint_Data_PC (std::shared_ptr< const EC_Group_Data > group, std::span< const uint8_t > pt)
size_t	field_element_bytes () const override
const std::shared_ptr< const EC_Group_Data > &	group () const override
bool	is_identity () const override
std::unique_ptr< EC_AffinePoint_Data >	mul (const EC_Scalar_Data &scalar, RandomNumberGenerator &rng, std::vector< BigInt > &ws) const override
void	serialize_compressed_to (std::span< uint8_t > bytes) const override
void	serialize_uncompressed_to (std::span< uint8_t > bytes) const override
void	serialize_x_to (std::span< uint8_t > bytes) const override
void	serialize_xy_to (std::span< uint8_t > bytes) const override
void	serialize_y_to (std::span< uint8_t > bytes) const override
EC_Point	to_legacy_point () const override
const PCurve::PrimeOrderCurve::AffinePoint &	value () const

Static Public Member Functions
static const EC_AffinePoint_Data_PC &	checked_ref (const EC_AffinePoint_Data &data)

Detailed Description

Definition at line 56 of file ec_inner_pc.h.

Constructor & Destructor Documentation

EC_AffinePoint_Data_PC() [1/2]

Botan::EC_AffinePoint_Data_PC::EC_AffinePoint_Data_PC	(	std::shared_ptr< const EC_Group_Data >	group,
		PCurve::PrimeOrderCurve::AffinePoint	pt )

Definition at line 86 of file ec_inner_pc.cpp.

                                                                                    :
      m_group(std::move(group)), m_pt(std::move(pt)) {
   if(!m_pt.is_identity()) {
      m_xy = m_pt.serialize<secure_vector<uint8_t>>();
      BOTAN_ASSERT_NOMSG(m_xy.size() == 1 + 2 * field_element_bytes());
   }
}

References Botan::PCurve::PrimeOrderCurve::AffinePoint::is_identity().

EC_AffinePoint_Data_PC() [2/2]

Botan::EC_AffinePoint_Data_PC::EC_AffinePoint_Data_PC	(	std::shared_ptr< const EC_Group_Data >	group,
		std::span< const uint8_t >	pt )

Definition at line 95 of file ec_inner_pc.cpp.

                                                                             :
      m_group(std::move(group)), m_pt(deserialize_pcurve_pt(m_group->pcurve(), bytes)) {
   if(!m_pt.is_identity()) {
      m_xy = m_pt.serialize<secure_vector<uint8_t>>();
      BOTAN_ASSERT_NOMSG(m_xy.size() == 1 + 2 * field_element_bytes());
   }
}

References Botan::PCurve::PrimeOrderCurve::AffinePoint::is_identity().

Member Function Documentation

checked_ref()

const EC_AffinePoint_Data_PC & Botan::EC_AffinePoint_Data_PC::checked_ref ( const EC_AffinePoint_Data & data )

static

Definition at line 104 of file ec_inner_pc.cpp.

                                                                                                 {
   const auto* p = dynamic_cast<const EC_AffinePoint_Data_PC*>(&data);
   if(!p) {
      throw Invalid_State("Failed conversion to EC_AffinePoint_Data_PC");
   }
   return *p;
}

Referenced by Botan::EC_Mul2Table_Data_PC::EC_Mul2Table_Data_PC().

clone()

std::unique_ptr< EC_AffinePoint_Data > Botan::EC_AffinePoint_Data_PC::clone ( ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 112 of file ec_inner_pc.cpp.

                                                                       {
   return std::make_unique<EC_AffinePoint_Data_PC>(m_group, m_pt);
}

field_element_bytes()

size_t Botan::EC_AffinePoint_Data_PC::field_element_bytes ( ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 131 of file ec_inner_pc.cpp.

                                                         {
   return m_group->pcurve().field_element_bytes();
}

Referenced by serialize_compressed_to(), serialize_uncompressed_to(), serialize_x_to(), serialize_xy_to(), serialize_y_to(), and to_legacy_point().

group()

const std::shared_ptr< const EC_Group_Data > & Botan::EC_AffinePoint_Data_PC::group ( ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 116 of file ec_inner_pc.cpp.

                                                                              {
   return m_group;
}

is_identity()

bool Botan::EC_AffinePoint_Data_PC::is_identity ( ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 135 of file ec_inner_pc.cpp.

                                               {
   return m_xy.empty();
}

Referenced by serialize_compressed_to(), serialize_uncompressed_to(), serialize_x_to(), serialize_xy_to(), serialize_y_to(), and to_legacy_point().

mul()

std::unique_ptr< EC_AffinePoint_Data > Botan::EC_AffinePoint_Data_PC::mul ( const EC_Scalar_Data & scalar, RandomNumberGenerator & rng, std::vector< BigInt > & ws ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 120 of file ec_inner_pc.cpp.

                                                                                              {
   BOTAN_UNUSED(ws);
 
   BOTAN_ARG_CHECK(scalar.group() == m_group, "Curve mismatch");
   const auto& k = EC_Scalar_Data_PC::checked_ref(scalar).value();
   auto pt = m_group->pcurve().mul(m_pt, k, rng).to_affine();
   return std::make_unique<EC_AffinePoint_Data_PC>(m_group, std::move(pt));
}

References BOTAN_ARG_CHECK, BOTAN_UNUSED, Botan::EC_Scalar_Data_PC::checked_ref(), Botan::EC_Scalar_Data::group(), and Botan::EC_Scalar_Data_PC::value().

serialize_compressed_to()

void Botan::EC_AffinePoint_Data_PC::serialize_compressed_to ( std::span< uint8_t > bytes ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 160 of file ec_inner_pc.cpp.

                                                                                 {
   BOTAN_STATE_CHECK(!this->is_identity());
   const size_t fe_bytes = this->field_element_bytes();
   BOTAN_ARG_CHECK(bytes.size() == 1 + fe_bytes, "Invalid output size");
   const bool y_is_odd = (m_xy.back() & 0x01) == 0x01;
 
   BufferStuffer stuffer(bytes);
   stuffer.append(y_is_odd ? 0x03 : 0x02);
   this->serialize_x_to(stuffer.next(fe_bytes));
}

References Botan::BufferStuffer::append(), BOTAN_ARG_CHECK, BOTAN_STATE_CHECK, field_element_bytes(), is_identity(), Botan::BufferStuffer::next(), and serialize_x_to().

serialize_uncompressed_to()

void Botan::EC_AffinePoint_Data_PC::serialize_uncompressed_to ( std::span< uint8_t > bytes ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 171 of file ec_inner_pc.cpp.

                                                                                   {
   BOTAN_STATE_CHECK(!this->is_identity());
   const size_t fe_bytes = this->field_element_bytes();
   BOTAN_ARG_CHECK(bytes.size() == 1 + 2 * fe_bytes, "Invalid output size");
   copy_mem(bytes, m_xy);
}

References BOTAN_ARG_CHECK, BOTAN_STATE_CHECK, Botan::copy_mem(), field_element_bytes(), and is_identity().

serialize_x_to()

void Botan::EC_AffinePoint_Data_PC::serialize_x_to ( std::span< uint8_t > bytes ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 139 of file ec_inner_pc.cpp.

                                                                        {
   BOTAN_STATE_CHECK(!this->is_identity());
   const size_t fe_bytes = this->field_element_bytes();
   BOTAN_ARG_CHECK(bytes.size() == fe_bytes, "Invalid output size");
   copy_mem(bytes, std::span{m_xy}.subspan(1, fe_bytes));
}

References BOTAN_ARG_CHECK, BOTAN_STATE_CHECK, Botan::copy_mem(), field_element_bytes(), and is_identity().

Referenced by serialize_compressed_to().

serialize_xy_to()

void Botan::EC_AffinePoint_Data_PC::serialize_xy_to ( std::span< uint8_t > bytes ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 153 of file ec_inner_pc.cpp.

                                                                         {
   BOTAN_STATE_CHECK(!this->is_identity());
   const size_t fe_bytes = this->field_element_bytes();
   BOTAN_ARG_CHECK(bytes.size() == 2 * fe_bytes, "Invalid output size");
   copy_mem(bytes, std::span{m_xy}.last(2 * fe_bytes));
}

References BOTAN_ARG_CHECK, BOTAN_STATE_CHECK, Botan::copy_mem(), field_element_bytes(), and is_identity().

serialize_y_to()

void Botan::EC_AffinePoint_Data_PC::serialize_y_to ( std::span< uint8_t > bytes ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 146 of file ec_inner_pc.cpp.

                                                                        {
   BOTAN_STATE_CHECK(!this->is_identity());
   const size_t fe_bytes = this->field_element_bytes();
   BOTAN_ARG_CHECK(bytes.size() == fe_bytes, "Invalid output size");
   copy_mem(bytes, std::span{m_xy}.subspan(1 + fe_bytes, fe_bytes));
}

References BOTAN_ARG_CHECK, BOTAN_STATE_CHECK, Botan::copy_mem(), field_element_bytes(), and is_identity().

to_legacy_point()

EC_Point Botan::EC_AffinePoint_Data_PC::to_legacy_point ( ) const

overridevirtual

Implements Botan::EC_AffinePoint_Data.

Definition at line 178 of file ec_inner_pc.cpp.

                                                       {
   if(this->is_identity()) {
      return EC_Point(m_group->curve());
   } else {
      const size_t fe_bytes = this->field_element_bytes();
      return EC_Point(m_group->curve(),
                      BigInt::from_bytes(std::span{m_xy}.subspan(1, fe_bytes)),
                      BigInt::from_bytes(std::span{m_xy}.last(fe_bytes)));
   }
}

References field_element_bytes(), Botan::BigInt::from_bytes(), and is_identity().

value()

const PCurve::PrimeOrderCurve::AffinePoint & Botan::EC_AffinePoint_Data_PC::value ( ) const

inline

Definition at line 86 of file ec_inner_pc.h.

{ return m_pt; }

---

The documentation for this class was generated from the following files:

• src/lib/pubkey/ec_group/ec_inner_pc.h
• src/lib/pubkey/ec_group/ec_inner_pc.cpp