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/*
* ECC Domain Parameters
*
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* 2008-2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ECC_DOMAIN_PARAMETERS_H__
#define BOTAN_ECC_DOMAIN_PARAMETERS_H__
#include <botan/point_gfp.h>
#include <botan/curve_gfp.h>
#include <botan/asn1_oid.h>
namespace Botan {
/**
* This class represents elliptic curce domain parameters
*/
enum EC_Group_Encoding {
EC_DOMPAR_ENC_EXPLICIT = 0,
EC_DOMPAR_ENC_IMPLICITCA = 1,
EC_DOMPAR_ENC_OID = 2
};
/**
* Class representing an elliptic curve
*/
class BOTAN_DLL EC_Group
{
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_Group(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_Group(const std::vector<byte>& ber_encoding);
/**
* Create an EC domain by OID (or throw if unknown)
* @param oid the OID of the EC domain to create
*/
EC_Group(const OID& oid);
/**
* Create an EC domain from PEM encoding (as from PEM_encode), or
* from an OID name (eg "secp256r1", or "1.2.840.10045.3.1.7")
* @param pem_or_oid PEM-encoded data, or an OID
*/
EC_Group(const std::string& pem_or_oid = "");
/**
* Create the DER encoding of this domain
* @param form of encoding to use
* @returns bytes encododed as DER
*/
std::vector<byte> DER_encode(EC_Group_Encoding form) const;
/**
* Return the PEM encoding (always in explicit form)
* @return string containing PEM data
*/
std::string PEM_encode() const;
/**
* Return domain parameter curve
* @result domain parameter curve
*/
const CurveGFp& get_curve() const { return curve; }
/**
* Return group base point
* @result base point
*/
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; }
bool initialized() const { return !base_point.is_zero(); }
/**
* Return the OID of these domain parameters
* @result the OID
*/
std::string get_oid() const { return oid; }
bool operator==(const EC_Group& 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()));
}
/**
* Return PEM representation of named EC group
*/
static const char* PEM_for_named_group(const std::string& name);
private:
CurveGFp curve;
PointGFp base_point;
BigInt order, cofactor;
std::string oid;
};
inline bool operator!=(const EC_Group& lhs,
const EC_Group& rhs)
{
return !(lhs == rhs);
}
// For compatibility with 1.8
typedef EC_Group EC_Domain_Params;
}
#endif
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