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/*
* ECC Domain Parameters
*
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* 2008-2010 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/curve_gfp.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
*/
enum EC_Domain_Params_Encoding {
EC_DOMPAR_ENC_EXPLICIT = 0,
EC_DOMPAR_ENC_IMPLICITCA = 1,
EC_DOMPAR_ENC_OID = 2
};
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) :
curve(curve),
base_point(base_point),
order(order),
cofactor(cofactor),
oid("")
{}
/**
* Decode a BER encoded ECC domain parameter set
* @param ber_encoding the bytes of the BER encoding
*/
EC_Domain_Params(const MemoryRegion<byte>& ber_encoding);
/**
* Create the DER encoding of this domain
* @param form of encoding to use
* @returns bytes encododed as DER
*/
SecureVector<byte> DER_encode(EC_Domain_Params_Encoding form) const;
/**
* Return domain parameter curve
* @result domain parameter curve
*/
const CurveGFp& get_curve() const { return curve; }
/**
* Return domain parameter curve
* @result domain parameter curve
*/
const PointGFp& get_base_point() const { return base_point; }
/**
* Return the order of the base point
* @result order of the base point
*/
const BigInt& get_order() const { return order; }
/**
* Return the cofactor
* @result the cofactor
*/
const BigInt& get_cofactor() const { return cofactor; }
/**
* Return the OID of these domain parameters
* @result the OID
*/
std::string get_oid() const { return oid; }
bool operator==(const EC_Domain_Params& other) const
{
return ((get_curve() == other.get_curve()) &&
(get_base_point() == other.get_base_point()) &&
(get_order() == other.get_order()) &&
(get_cofactor() == other.get_cofactor()));
}
private:
friend EC_Domain_Params get_EC_Dom_Pars_by_oid(std::string oid);
CurveGFp curve;
PointGFp base_point;
BigInt order, cofactor;
std::string oid;
};
inline bool operator!=(const EC_Domain_Params& lhs,
const EC_Domain_Params& rhs)
{
return !(lhs == rhs);
}
/**
* 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 BOTAN_DLL get_EC_Dom_Pars_by_oid(std::string oid);
}
#endif
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