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/*
* ECKAEG implemenation
* (C) 2007 Manuel Hartl, FlexSecure GmbH
* 2007 Falko Strenzke, FlexSecure GmbH
* 2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/eckaeg.h>
#include <botan/numthry.h>
#include <botan/util.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/secmem.h>
#include <botan/point_gfp.h>
namespace Botan {
/*********************************
* ECKAEG_PublicKey
*********************************/
void ECKAEG_PublicKey::affirm_init() const // virtual
{
EC_PublicKey::affirm_init();
}
void ECKAEG_PublicKey::set_all_values(ECKAEG_PublicKey const& other)
{
m_param_enc = other.m_param_enc;
m_eckaeg_core = other.m_eckaeg_core;
m_enc_public_point = other.m_enc_public_point;
if(other.mp_dom_pars.get())
{
mp_dom_pars.reset(new EC_Domain_Params(*(other.mp_dom_pars)));
}
if(other.mp_public_point.get())
{
mp_public_point.reset(new PointGFp(*(other.mp_public_point)));
}
}
ECKAEG_PublicKey::ECKAEG_PublicKey(ECKAEG_PublicKey const& other)
: Public_Key(),
EC_PublicKey()
{
set_all_values(other);
}
ECKAEG_PublicKey const& ECKAEG_PublicKey::operator=(ECKAEG_PublicKey const& rhs)
{
set_all_values(rhs);
return *this;
}
void ECKAEG_PublicKey::X509_load_hook()
{
EC_PublicKey::X509_load_hook();
EC_PublicKey::affirm_init();
m_eckaeg_core = ECKAEG_Core(*mp_dom_pars, BigInt(0), *mp_public_point);
}
ECKAEG_PublicKey::ECKAEG_PublicKey(EC_Domain_Params const& dom_par, PointGFp const& public_point)
{
mp_dom_pars = std::auto_ptr<EC_Domain_Params>(new EC_Domain_Params(dom_par));
mp_public_point = std::auto_ptr<PointGFp>(new PointGFp(public_point));
if(mp_public_point->get_curve() != mp_dom_pars->get_curve())
{
throw Invalid_Argument("ECKAEG_PublicKey(): curve of arg. point and curve of arg. domain parameters are different");
}
EC_PublicKey::affirm_init();
m_eckaeg_core = ECKAEG_Core(*mp_dom_pars, BigInt(0), *mp_public_point);
}
/*********************************
* ECKAEG_PrivateKey
*********************************/
void ECKAEG_PrivateKey::affirm_init() const // virtual
{
EC_PrivateKey::affirm_init();
}
void ECKAEG_PrivateKey::PKCS8_load_hook(bool generated)
{
EC_PrivateKey::PKCS8_load_hook(generated);
EC_PrivateKey::affirm_init();
m_eckaeg_core = ECKAEG_Core(*mp_dom_pars, m_private_value, *mp_public_point);
}
void ECKAEG_PrivateKey::set_all_values(ECKAEG_PrivateKey const& other)
{
m_private_value = other.m_private_value;
m_param_enc = other.m_param_enc;
m_eckaeg_core = other.m_eckaeg_core;
m_enc_public_point = other.m_enc_public_point;
if(other.mp_dom_pars.get())
{
mp_dom_pars.reset(new EC_Domain_Params(*(other.mp_dom_pars)));
}
if(other.mp_public_point.get())
{
mp_public_point.reset(new PointGFp(*(other.mp_public_point)));
}
}
ECKAEG_PrivateKey::ECKAEG_PrivateKey(ECKAEG_PrivateKey const& other)
: Public_Key(),
EC_PublicKey(),
Private_Key(),
ECKAEG_PublicKey(),
EC_PrivateKey(),
PK_Key_Agreement_Key()
{
set_all_values(other);
}
ECKAEG_PrivateKey const& ECKAEG_PrivateKey::operator= (ECKAEG_PrivateKey const& rhs)
{
set_all_values(rhs);
return *this;
}
MemoryVector<byte> ECKAEG_PrivateKey::public_value() const
{
return EC2OSP(public_point(), PointGFp::UNCOMPRESSED);
}
/**
* Derive a key
*/
SecureVector<byte> ECKAEG_PrivateKey::derive_key(const byte key[],
u32bit key_len) const
{
MemoryVector<byte> key_x(key, key_len); // FIXME: nasty/slow
PointGFp point = OS2ECP(key_x, public_point().get_curve());
return m_eckaeg_core.agree(point);
}
/**
* Derive a key
*/
SecureVector<byte> ECKAEG_PrivateKey::derive_key(const ECKAEG_PublicKey& key) const
{
affirm_init();
key.affirm_init();
return m_eckaeg_core.agree(key.public_point());
}
}
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