#include <pcurves.h>

Inheritance diagram for Botan::PCurve::PrimeOrderCurve:

Classes
class	AffinePoint

class	PrecomputedMul2Table

class	ProjectivePoint

class	Scalar

Public Types
typedef std::shared_ptr< const PrimeOrderCurve >	CurvePtr

typedef std::array< word, StorageWords >	StorageUnit

Public Member Functions
virtual bool	affine_point_is_identity (const AffinePoint &pt) const =0

virtual Scalar	base_point_mul_x_mod_order (const Scalar &scalar, RandomNumberGenerator &rng) const =0

virtual std::optional< AffinePoint >	deserialize_point (std::span< const uint8_t > bytes) const =0

virtual std::optional< Scalar >	deserialize_scalar (std::span< const uint8_t > bytes) const =0

virtual size_t	field_element_bytes () const =0

virtual AffinePoint	generator () const =0
	Return the standard generator.

virtual ProjectivePoint	hash_to_curve (std::string_view hash, std::span< const uint8_t > input, std::span< const uint8_t > domain_sep, bool random_oracle) const =0

virtual ProjectivePoint	mul (const AffinePoint &pt, const Scalar &scalar, RandomNumberGenerator &rng) const =0

virtual std::unique_ptr< const PrecomputedMul2Table >	mul2_setup (const AffinePoint &pt1, const AffinePoint &pt2) const =0
	Setup a table for 2-ary multiplication.

virtual std::optional< ProjectivePoint >	mul2_vartime (const PrecomputedMul2Table &table, const Scalar &s1, const Scalar &s2) const =0

virtual std::optional< Scalar >	mul2_vartime_x_mod_order (const PrecomputedMul2Table &table, const Scalar &s1, const Scalar &s2) const =0

virtual ProjectivePoint	mul_by_g (const Scalar &scalar, RandomNumberGenerator &rng) const =0

virtual size_t	order_bits () const =0
	Return the bit length of the group order.

virtual ProjectivePoint	point_add (const ProjectivePoint &a, const ProjectivePoint &b) const =0

virtual ProjectivePoint	point_add_mixed (const ProjectivePoint &a, const AffinePoint &b) const =0

virtual ProjectivePoint	point_double (const ProjectivePoint &pt) const =0

virtual ProjectivePoint	point_negate (const ProjectivePoint &pt) const =0

virtual AffinePoint	point_to_affine (const ProjectivePoint &pt) const =0

virtual ProjectivePoint	point_to_projective (const AffinePoint &pt) const =0

virtual Scalar	random_scalar (RandomNumberGenerator &rng) const =0

virtual Scalar	scalar_add (const Scalar &a, const Scalar &b) const =0

virtual size_t	scalar_bytes () const =0
	Return the byte length of the scalar element.

virtual bool	scalar_equal (const Scalar &a, const Scalar &b) const =0

virtual Scalar	scalar_from_bits_with_trunc (std::span< const uint8_t > bytes) const =0

virtual Scalar	scalar_from_u32 (uint32_t x) const =0

virtual std::optional< Scalar >	scalar_from_wide_bytes (std::span< const uint8_t > bytes) const =0

virtual Scalar	scalar_invert (const Scalar &s) const =0

virtual bool	scalar_is_zero (const Scalar &s) const =0

virtual Scalar	scalar_mul (const Scalar &a, const Scalar &b) const =0

virtual Scalar	scalar_negate (const Scalar &s) const =0

virtual Scalar	scalar_one () const =0

virtual Scalar	scalar_square (const Scalar &s) const =0

virtual Scalar	scalar_sub (const Scalar &a, const Scalar &b) const =0

virtual Scalar	scalar_zero () const =0

virtual void	serialize_point (std::span< uint8_t > bytes, const AffinePoint &pt) const =0

virtual void	serialize_point_compressed (std::span< uint8_t > bytes, const AffinePoint &pt) const =0

virtual void	serialize_point_x (std::span< uint8_t > bytes, const AffinePoint &pt) const =0

virtual void	serialize_scalar (std::span< uint8_t > bytes, const Scalar &scalar) const =0

virtual	~PrimeOrderCurve ()=default

Static Public Member Functions
static std::shared_ptr< const PrimeOrderCurve >	from_id (PrimeOrderCurveId id)

static std::shared_ptr< const PrimeOrderCurve >	from_name (std::string_view name)

Static Public Attributes
static const size_t	MaximumBitLength = 521

static const size_t	MaximumByteLength = (MaximumBitLength + 7) / 8

static const size_t	StorageWords = (MaximumByteLength + sizeof(word) - 1) / sizeof(word)
	Number of words used to store MaximumByteLength.

Detailed Description

An elliptic curve without cofactor in Weierstrass form

Definition at line 32 of file pcurves.h.

Member Typedef Documentation

◆ CurvePtr

typedef std::shared_ptr<const PrimeOrderCurve> Botan::PCurve::PrimeOrderCurve::CurvePtr

Definition at line 55 of file pcurves.h.

◆ StorageUnit

typedef std::array<word, StorageWords> Botan::PCurve::PrimeOrderCurve::StorageUnit

Definition at line 54 of file pcurves.h.

Constructor & Destructor Documentation

◆ ~PrimeOrderCurve()

virtual Botan::PCurve::PrimeOrderCurve::~PrimeOrderCurve ( )

virtualdefault

Member Function Documentation

◆ affine_point_is_identity()

virtual bool Botan::PCurve::PrimeOrderCurve::affine_point_is_identity ( const AffinePoint & pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ base_point_mul_x_mod_order()

virtual Scalar Botan::PCurve::PrimeOrderCurve::base_point_mul_x_mod_order	(	const Scalar &	scalar,
		RandomNumberGenerator &	rng ) const

pure virtual

Base point multiplication, returning only the x coordinate modulo the group order

Multiply by the standard generator point g, then extract the x coordinate as an integer, then reduce the x coordinate modulo the group order

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ deserialize_point()

virtual std::optional< AffinePoint > Botan::PCurve::PrimeOrderCurve::deserialize_point ( std::span< const uint8_t > bytes ) const

pure virtual

Deserialize a point

Both compressed and uncompressed encodings are accepted

Note that the deprecated "hybrid" encoding is not supported here

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ deserialize_scalar()

virtual std::optional< Scalar > Botan::PCurve::PrimeOrderCurve::deserialize_scalar ( std::span< const uint8_t > bytes ) const

pure virtual

Deserialize a scalar

This function requires the input length be exactly scalar_bytes long; it does not accept inputs that are shorter, or with excess leading zero padding bytes.

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ field_element_bytes()

virtual size_t Botan::PCurve::PrimeOrderCurve::field_element_bytes ( ) const

pure virtual

Return the byte length of a field element

Each point consists of two field elements

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ from_id()

std::shared_ptr< const PrimeOrderCurve > Botan::PCurve::PrimeOrderCurve::from_id ( PrimeOrderCurveId id )

static

Definition at line 80 of file pcurves.cpp.

                                                                                  {
   switch(id.code()) {
      case PrimeOrderCurveId::secp256r1:
         return PCurveInstance::secp256r1();
      case PrimeOrderCurveId::secp384r1:
         return PCurveInstance::secp384r1();
      case PrimeOrderCurveId::secp521r1:
         return PCurveInstance::secp521r1();
      case PrimeOrderCurveId::secp256k1:
         return PCurveInstance::secp256k1();
      case PrimeOrderCurveId::brainpool256r1:
         return PCurveInstance::brainpool256r1();
      case PrimeOrderCurveId::brainpool384r1:
         return PCurveInstance::brainpool384r1();
      case PrimeOrderCurveId::brainpool512r1:
         return PCurveInstance::brainpool512r1();
      case PrimeOrderCurveId::frp256v1:
         return PCurveInstance::frp256v1();
      case PrimeOrderCurveId::sm2p256v1:
         return PCurveInstance::sm2p256v1();
   }
   return {};
}

Referenced by Botan::hash_to_curve_sswu().

◆ from_name()

static std::shared_ptr< const PrimeOrderCurve > Botan::PCurve::PrimeOrderCurve::from_name ( std::string_view name )

inlinestatic

Definition at line 44 of file pcurves.h.

                                                                                 {
         if(auto id = PrimeOrderCurveId::from_string(name)) {
            return PrimeOrderCurve::from_id(id.value());
         } else {
            return {};
         }
      }

References name.

◆ generator()

virtual AffinePoint Botan::PCurve::PrimeOrderCurve::generator ( ) const

pure virtual

Return the standard generator.

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ hash_to_curve()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::hash_to_curve	(	std::string_view	hash,
		std::span< const uint8_t >	input,
		std::span< const uint8_t >	domain_sep,
		bool	random_oracle ) const

pure virtual

RFC 9380 hash to curve

This is currently only supported for a few specific curves

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ mul()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::mul	(	const AffinePoint &	pt,
		const Scalar &	scalar,
		RandomNumberGenerator &	rng ) const

pure virtual

Generic point multiplication

Multiply an arbitrary point by a scalar

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ mul2_setup()

virtual std::unique_ptr< const PrecomputedMul2Table > Botan::PCurve::PrimeOrderCurve::mul2_setup	(	const AffinePoint &	pt1,
		const AffinePoint &	pt2 ) const

pure virtual

Setup a table for 2-ary multiplication.

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ mul2_vartime()

virtual std::optional< ProjectivePoint > Botan::PCurve::PrimeOrderCurve::mul2_vartime	(	const PrecomputedMul2Table &	table,
		const Scalar &	s1,
		const Scalar &	s2 ) const

pure virtual

Perform 2-ary multiplication (variable time)

Compute s1*pt1 + s2*pt2 in variable time

Returns nullopt if the produced point is the point at infinity

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ mul2_vartime_x_mod_order()

virtual std::optional< Scalar > Botan::PCurve::PrimeOrderCurve::mul2_vartime_x_mod_order	(	const PrecomputedMul2Table &	table,
		const Scalar &	s1,
		const Scalar &	s2 ) const

pure virtual

Perform 2-ary multiplication (variable time), reducing x modulo order

Compute s1*pt1 + s2*pt2 in variable time, then extract the x coordinate of the result, and reduce x modulo the group order

Returns nullopt if the produced point is the point at infinity

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ mul_by_g()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::mul_by_g	(	const Scalar &	scalar,
		RandomNumberGenerator &	rng ) const

pure virtual

Base point multiplication

Multiply by the standard generator point g

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ order_bits()

virtual size_t Botan::PCurve::PrimeOrderCurve::order_bits ( ) const

pure virtual

Return the bit length of the group order.

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ point_add()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::point_add	(	const ProjectivePoint &	a,
		const ProjectivePoint &	b ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ point_add_mixed()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::point_add_mixed	(	const ProjectivePoint &	a,
		const AffinePoint &	b ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ point_double()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::point_double ( const ProjectivePoint & pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ point_negate()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::point_negate ( const ProjectivePoint & pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ point_to_affine()

virtual AffinePoint Botan::PCurve::PrimeOrderCurve::point_to_affine ( const ProjectivePoint & pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ point_to_projective()

virtual ProjectivePoint Botan::PCurve::PrimeOrderCurve::point_to_projective ( const AffinePoint & pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ random_scalar()

virtual Scalar Botan::PCurve::PrimeOrderCurve::random_scalar ( RandomNumberGenerator & rng ) const

pure virtual

Return a new random scalar

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_add()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_add	(	const Scalar &	a,
		const Scalar &	b ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_bytes()

virtual size_t Botan::PCurve::PrimeOrderCurve::scalar_bytes ( ) const

pure virtual

Return the byte length of the scalar element.

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_equal()

virtual bool Botan::PCurve::PrimeOrderCurve::scalar_equal	(	const Scalar &	a,
		const Scalar &	b ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_from_bits_with_trunc()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_from_bits_with_trunc ( std::span< const uint8_t > bytes ) const

pure virtual

Deserialize a scalar using ECDSA truncation rules

ECDSA and other signature schemes use a specific rule for converting a hash output into a scalar.

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_from_u32()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_from_u32 ( uint32_t x ) const

pure virtual

Return a small scalar

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_from_wide_bytes()

virtual std::optional< Scalar > Botan::PCurve::PrimeOrderCurve::scalar_from_wide_bytes ( std::span< const uint8_t > bytes ) const

pure virtual

Reduce an integer modulo the group order

The input can be at most twice the bit length of the order; if larger than this nullopt is returned

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_invert()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_invert ( const Scalar & s ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_is_zero()

virtual bool Botan::PCurve::PrimeOrderCurve::scalar_is_zero ( const Scalar & s ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_mul()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_mul	(	const Scalar &	a,
		const Scalar &	b ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_negate()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_negate ( const Scalar & s ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_one()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_one ( ) const

pure virtual

Return the scalar one

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_square()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_square ( const Scalar & s ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_sub()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_sub	(	const Scalar &	a,
		const Scalar &	b ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ scalar_zero()

virtual Scalar Botan::PCurve::PrimeOrderCurve::scalar_zero ( ) const

pure virtual

Return the scalar zero

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ serialize_point()

virtual void Botan::PCurve::PrimeOrderCurve::serialize_point	(	std::span< uint8_t >	bytes,
		const AffinePoint &	pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ serialize_point_compressed()

virtual void Botan::PCurve::PrimeOrderCurve::serialize_point_compressed	(	std::span< uint8_t >	bytes,
		const AffinePoint &	pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ serialize_point_x()

virtual void Botan::PCurve::PrimeOrderCurve::serialize_point_x	(	std::span< uint8_t >	bytes,
		const AffinePoint &	pt ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

◆ serialize_scalar()

virtual void Botan::PCurve::PrimeOrderCurve::serialize_scalar	(	std::span< uint8_t >	bytes,
		const Scalar &	scalar ) const

pure virtual

Implemented in Botan::PCurve::PrimeOrderCurveImpl< C >.

Member Data Documentation

◆ MaximumBitLength

const size_t Botan::PCurve::PrimeOrderCurve::MaximumBitLength = 521

static

Somewhat arbitrary maximum size for a field or scalar

Sized to fit at least P-521

Definition at line 37 of file pcurves.h.

◆ MaximumByteLength

const size_t Botan::PCurve::PrimeOrderCurve::MaximumByteLength = (MaximumBitLength + 7) / 8

static

Definition at line 39 of file pcurves.h.

◆ StorageWords

const size_t Botan::PCurve::PrimeOrderCurve::StorageWords = (MaximumByteLength + sizeof(word) - 1) / sizeof(word)

static

Number of words used to store MaximumByteLength.

Definition at line 42 of file pcurves.h.

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

src/lib/math/pcurves/pcurves.h
src/lib/math/pcurves/pcurves.cpp

Classes

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Detailed Description

Member Typedef Documentation

◆ CurvePtr

◆ StorageUnit

Constructor & Destructor Documentation

◆ ~PrimeOrderCurve()

Member Function Documentation

◆ affine_point_is_identity()

◆ base_point_mul_x_mod_order()

◆ deserialize_point()

◆ deserialize_scalar()

◆ field_element_bytes()

◆ from_id()

◆ from_name()

◆ generator()

◆ hash_to_curve()

◆ mul()

◆ mul2_setup()

◆ mul2_vartime()

◆ mul2_vartime_x_mod_order()

◆ mul_by_g()

◆ order_bits()

◆ point_add()

◆ point_add_mixed()

◆ point_double()

◆ point_negate()

◆ point_to_affine()

◆ point_to_projective()

◆ random_scalar()

◆ scalar_add()

◆ scalar_bytes()

◆ scalar_equal()

◆ scalar_from_bits_with_trunc()

◆ scalar_from_u32()

◆ scalar_from_wide_bytes()

◆ scalar_invert()

◆ scalar_is_zero()

◆ scalar_mul()

◆ scalar_negate()

◆ scalar_one()

◆ scalar_square()

◆ scalar_sub()

◆ scalar_zero()

◆ serialize_point()

◆ serialize_point_compressed()

◆ serialize_point_x()

◆ serialize_scalar()

Member Data Documentation

◆ MaximumBitLength

◆ MaximumByteLength

◆ StorageWords