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/*
* ECC Domain Parameters
*
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* 2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_ECC_DOMAIN_PARAMETERS_H__
#define BOTAN_ECC_DOMAIN_PARAMETERS_H__
#include <botan/point_gfp.h>
#include <botan/gfp_element.h>
#include <botan/curve_gfp.h>
#include <botan/bigint.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/alg_id.h>
#include <botan/pubkey_enums.h>
namespace Botan {
/**
* This class represents elliptic curce domain parameters
*/
class BOTAN_DLL EC_Domain_Params
{
public:
/**
* Construct Domain paramers from specified parameters
* @param curve elliptic curve
* @param base_point a base point
* @param order the order of the base point
* @param cofactor the cofactor
*/
EC_Domain_Params(const CurveGFp& curve,
const PointGFp& base_point,
const BigInt& order,
const BigInt& cofactor);
/**
* Return domain parameter curve
* @result domain parameter curve
*/
const CurveGFp& get_curve() const
{
return m_curve;
}
/**
* Return domain parameter curve
* @result domain parameter curve
*/
const PointGFp& get_base_point() const
{
return m_base_point;
}
/**
* Return the order of the base point
* @result order of the base point
*/
const BigInt& get_order() const
{
return m_order;
}
/**
* Return the cofactor
* @result the cofactor
*/
const BigInt& get_cofactor() const
{
return m_cofactor;
}
/**
* Return the OID of these domain parameters
* @result the OID
*/
std::string get_oid() const { return m_oid; }
private:
friend EC_Domain_Params get_EC_Dom_Pars_by_oid(std::string oid);
CurveGFp m_curve;
PointGFp m_base_point;
BigInt m_order;
BigInt m_cofactor;
std::string m_oid;
};
bool operator==(EC_Domain_Params const& lhs, EC_Domain_Params const& rhs);
inline bool operator!=(const EC_Domain_Params& lhs,
const EC_Domain_Params& rhs)
{
return !(lhs == rhs);
}
enum EC_dompar_enc { ENC_EXPLICIT = 0, ENC_IMPLICITCA = 1, ENC_OID = 2 };
SecureVector<byte> encode_der_ec_dompar(EC_Domain_Params const& dom_pars,
EC_dompar_enc enc_type);
EC_Domain_Params decode_ber_ec_dompar(SecureVector<byte> const& encoded);
/**
* Factory function, the only way to obtain EC domain parameters with
* an OID. The demanded OID has to be registered in the InSiTo
* configuration. Consult the file ec_dompar.cpp for the default
* configuration.
* @param oid the oid of the demanded EC domain parameters
* @result the EC domain parameters associated with the OID
*/
EC_Domain_Params get_EC_Dom_Pars_by_oid(std::string oid);
}
#endif
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