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/*
* ECDH
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* Manuel Hartl, FlexSecure GmbH
* (C) 2008-2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ECDH_KEY_H_
#define BOTAN_ECDH_KEY_H_
#include <botan/ecc_key.h>
namespace Botan {
/**
* This class represents ECDH Public Keys.
*/
class BOTAN_PUBLIC_API(2,0) ECDH_PublicKey : public virtual EC_PublicKey
{
public:
/**
* Create an ECDH public key.
* @param alg_id algorithm identifier
* @param key_bits DER encoded public key bits
*/
ECDH_PublicKey(const AlgorithmIdentifier& alg_id,
const std::vector<uint8_t>& key_bits) :
EC_PublicKey(alg_id, key_bits) {}
/**
* Construct a public key from a given public point.
* @param dom_par the domain parameters associated with this key
* @param public_point the public point defining this key
*/
ECDH_PublicKey(const EC_Group& dom_par,
const PointGFp& public_point) :
EC_PublicKey(dom_par, public_point) {}
/**
* Get this keys algorithm name.
* @return this keys algorithm name
*/
std::string algo_name() const override { return "ECDH"; }
/**
* @return public point value
*/
std::vector<uint8_t> public_value() const
{ return public_point().encode(PointGFp::UNCOMPRESSED); }
/**
* @return public point value
*/
std::vector<uint8_t> public_value(PointGFp::Compression_Type format) const
{ return public_point().encode(format); }
protected:
ECDH_PublicKey() = default;
};
/**
* This class represents ECDH Private Keys.
*/
class BOTAN_PUBLIC_API(2,0) ECDH_PrivateKey final : public ECDH_PublicKey,
public EC_PrivateKey,
public PK_Key_Agreement_Key
{
public:
/**
* Load a private key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits ECPrivateKey bits
*/
ECDH_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<uint8_t>& key_bits) :
EC_PrivateKey(alg_id, key_bits) {}
/**
* Generate a new private key
* @param rng a random number generator
* @param domain parameters to used for this key
* @param x the private key; if zero, a new random key is generated
*/
ECDH_PrivateKey(RandomNumberGenerator& rng,
const EC_Group& domain,
const BigInt& x = 0) :
EC_PrivateKey(rng, domain, x) {}
std::unique_ptr<Public_Key> public_key() const override;
std::vector<uint8_t> public_value() const override
{ return ECDH_PublicKey::public_value(PointGFp::UNCOMPRESSED); }
std::vector<uint8_t> public_value(PointGFp::Compression_Type type) const
{ return ECDH_PublicKey::public_value(type); }
std::unique_ptr<PK_Ops::Key_Agreement>
create_key_agreement_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
};
}
#endif
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