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/*
* DL Scheme
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_DL_ALGO_H__
#define BOTAN_DL_ALGO_H__
#include <botan/dl_group.h>
#include <botan/x509_key.h>
namespace Botan {
/**
* This class represents discrete logarithm (DL) public keys.
*/
class BOTAN_DLL DL_Scheme_PublicKey : public virtual Public_Key
{
public:
bool check_key(RandomNumberGenerator& rng, bool) const override;
AlgorithmIdentifier algorithm_identifier() const override;
std::vector<byte> public_key_bits() const override;
/**
* Get the DL domain parameters of this key.
* @return DL domain parameters of this key
*/
const DL_Group& get_domain() const { return m_group; }
/**
* Get the public value y with y = g^x mod p where x is the secret key.
*/
const BigInt& get_y() const { return m_y; }
/**
* Get the prime p of the underlying DL group.
* @return prime p
*/
const BigInt& group_p() const { return m_group.get_p(); }
/**
* Get the prime q of the underlying DL group.
* @return prime q
*/
const BigInt& group_q() const { return m_group.get_q(); }
/**
* Get the generator g of the underlying DL group.
* @return generator g
*/
const BigInt& group_g() const { return m_group.get_g(); }
/**
* Get the underlying groups encoding format.
* @return encoding format
*/
virtual DL_Group::Format group_format() const = 0;
size_t key_length() const override;
size_t estimated_strength() const override;
/**
* Create a public key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits DER encoded public key bits
* @param group_format the underlying groups encoding format
*/
DL_Scheme_PublicKey(const AlgorithmIdentifier& alg_id,
const std::vector<byte>& key_bits,
DL_Group::Format group_format);
protected:
DL_Scheme_PublicKey() {}
/**
* The DL public key
*/
BigInt m_y;
/**
* The DL group
*/
DL_Group m_group;
};
/**
* This class represents discrete logarithm (DL) private keys.
*/
class BOTAN_DLL DL_Scheme_PrivateKey : public virtual DL_Scheme_PublicKey,
public virtual Private_Key
{
public:
bool check_key(RandomNumberGenerator& rng, bool) const override;
/**
* Get the secret key x.
* @return secret key
*/
const BigInt& get_x() const { return m_x; }
secure_vector<byte> private_key_bits() const override;
/**
* Create a private key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits DER encoded private key bits
* @param group_format the underlying groups encoding format
*/
DL_Scheme_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits,
DL_Group::Format group_format);
protected:
DL_Scheme_PrivateKey() {}
/**
* The DL private key
*/
BigInt m_x;
};
}
#endif
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