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/**
* (C) Copyright Projet SECRET, INRIA, Rocquencourt
* (C) Bhaskar Biswas and Nicolas Sendrier
*
* (C) 2014 cryptosource GmbH
* (C) 2014 Falko Strenzke fstrenzke@cryptosource.de
*
* Botan is released under the Simplified BSD License (see license.txt)
*
*/
#ifndef BOTAN_MCELIECE_KEY_H__
#define BOTAN_MCELIECE_KEY_H__
#include <botan/exceptn.h>
#include <botan/pk_keys.h>
#include <botan/polyn_gf2m.h>
namespace Botan {
class BOTAN_DLL McEliece_PublicKey : public virtual Public_Key
{
public:
McEliece_PublicKey(const std::vector<byte>& key_bits);
McEliece_PublicKey(std::vector<byte> const& pub_matrix, u32bit the_t, u32bit the_code_length) :
m_public_matrix(pub_matrix),
m_t(the_t),
m_code_length(the_code_length)
{}
McEliece_PublicKey(const McEliece_PublicKey & other);
std::string algo_name() const override { return "McEliece"; }
/**
* Get the maximum number of bits allowed to be fed to this key.
* This is the bitlength of the order of the base point.
* @result the maximum number of input bits
*/
size_t max_input_bits() const override
{
return get_message_word_bit_length();
};
AlgorithmIdentifier algorithm_identifier() const override;
size_t estimated_strength() const override;
std::vector<byte> x509_subject_public_key() const override;
bool check_key(RandomNumberGenerator&, bool) const override
{ return true; }
u32bit get_t() const { return m_t; }
u32bit get_code_length() const { return m_code_length; }
u32bit get_message_word_bit_length() const;
std::vector<byte> const& get_public_matrix() const { return m_public_matrix; }
bool operator==(const McEliece_PublicKey& other) const;
bool operator!=(const McEliece_PublicKey& other) const { return !(*this == other); }
protected:
McEliece_PublicKey() {}
std::vector<byte> m_public_matrix;
u32bit m_t;
u32bit m_code_length;
};
class BOTAN_DLL McEliece_PrivateKey : public virtual McEliece_PublicKey,
public virtual Private_Key
{
public:
/**
* Get the maximum number of bits allowed to be fed to this key.
* This is the bitlength of the order of the base point.
* @result the maximum number of input bits
*/
size_t max_input_bits() const override {
return m_Linv.size();
};
McEliece_PrivateKey(const secure_vector<byte>& key_bits);
McEliece_PrivateKey(polyn_gf2m const& goppa_polyn,
std::vector<u32bit> const& parity_check_matrix_coeffs,
std::vector<polyn_gf2m> const& square_root_matrix,
std::vector<gf2m> const& inverse_support,
std::vector<byte> const& public_matrix );
McEliece_PrivateKey(RandomNumberGenerator& rng, size_t code_length, size_t t);
bool check_key(RandomNumberGenerator& rng, bool strong) const override;
polyn_gf2m const& get_goppa_polyn() const { return m_g; };
std::vector<u32bit> const& get_H_coeffs() const { return m_coeffs; };
std::vector<gf2m> const& get_Linv() const { return m_Linv; };
std::vector<polyn_gf2m> const& get_sqrtmod() const { return m_sqrtmod; };
inline u32bit get_dimension() const
{ return m_dimension; };
inline u32bit get_codimension() const
{ return m_codimension; };
secure_vector<byte> pkcs8_private_key() const override;
bool operator==(const McEliece_PrivateKey & other) const;
bool operator!=(const McEliece_PrivateKey& other) const { return !(*this == other); };
private:
polyn_gf2m m_g;
std::vector<polyn_gf2m> m_sqrtmod;
std::vector<gf2m> m_Linv;
std::vector<u32bit> m_coeffs;
u32bit m_codimension;
u32bit m_dimension;
};
}
#endif
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