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/*************************************************
* ECC Key implemenation *
* (C) 2007 Manuel Hartl / FlexSecure GmbH *
* *
* Falko Strenzke *
* strenzke@flexsecure.de *
*************************************************/
#include <botan/ec.h>
#include <botan/ecdsa.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 {
/*************************************************
* EC_PublicKey *
*************************************************/
void EC_PublicKey::affirm_init() const // virtual
{
if ((mp_dom_pars.get() == 0) || (mp_public_point.get() == 0))
{
throw Invalid_State("cannot use uninitialized EC_Key");
}
}
EC_Domain_Params const EC_PublicKey::get_domain_parameters() const
{
if(!mp_dom_pars.get())
{
throw Invalid_State("EC_PublicKey::get_domain_parameters(): ec domain parameters are not yet set");
}
return *mp_dom_pars;
}
bool EC_PublicKey::domain_parameters_set()
{
if (mp_dom_pars.get())
{
return true;
}
return false;
}
void EC_PublicKey::X509_load_hook()
{
try
{
// the base point is checked to be on curve already when decoding it
affirm_init();
mp_public_point->check_invariants();
}
catch ( Illegal_Point exc )
{
throw Decoding_Error ( "decoded public point was found not to lie on curve" );
}
}
X509_Encoder* EC_PublicKey::x509_encoder() const
{
class EC_Key_Encoder : public X509_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
key->affirm_init();
SecureVector<byte> params = encode_der_ec_dompar ( * ( key->mp_dom_pars ), key->m_param_enc );
return AlgorithmIdentifier ( key->get_oid(),
params );
}
MemoryVector<byte> key_bits() const
{
key->affirm_init();
return EC2OSP ( * ( key->mp_public_point ), PointGFp::COMPRESSED );
}
EC_Key_Encoder ( const EC_PublicKey* k ) : key ( k )
{}
private:
const EC_PublicKey* key;
};
return new EC_Key_Encoder(this);
}
X509_Decoder* EC_PublicKey::x509_decoder()
{
class EC_Key_Decoder : public X509_Decoder
{
public:
void alg_id ( const AlgorithmIdentifier& alg_id )
{
key->mp_dom_pars.reset ( new EC_Domain_Params ( decode_ber_ec_dompar ( alg_id.parameters ) ) );
}
void key_bits ( const MemoryRegion<byte>& bits )
{
key->mp_public_point.reset ( new PointGFp ( OS2ECP ( bits, key->mp_dom_pars->get_curve() ) ) );
key->X509_load_hook();
}
EC_Key_Decoder ( EC_PublicKey* k ) : key ( k )
{}
private:
EC_PublicKey* key;
};
return new EC_Key_Decoder(this);
}
void EC_PublicKey::set_parameter_encoding ( EC_dompar_enc type )
{
if ( ( type != ENC_EXPLICIT ) && ( type != ENC_IMPLICITCA ) && ( type != ENC_OID ) )
{
throw Invalid_Argument ( "invalid encoding type for EC-key object specified" );
}
affirm_init();
if ( ( mp_dom_pars->get_oid() == "" ) && ( type == ENC_OID ) )
{
throw Invalid_Argument ( "invalid encoding type ENC_OID specified for EC-key object whose corresponding domain parameters are without oid" );
}
m_param_enc = type;
}
/********************************
* EC_PrivateKey *
********************************/
void EC_PrivateKey::affirm_init() const // virtual
{
EC_PublicKey::affirm_init();
if (m_private_value == 0)
{
throw Invalid_State("cannot use EC_PrivateKey when private key is uninitialized");
}
}
ECDSA_PrivateKey::ECDSA_PrivateKey(RandomNumberGenerator& rng,
const EC_Domain_Params& dom_pars)
{
mp_dom_pars = std::auto_ptr<EC_Domain_Params>(new EC_Domain_Params(dom_pars));
generate_private_key(rng);
try
{
mp_public_point->check_invariants();
}
catch(Illegal_Point& e)
{
throw Invalid_State("ECDSA key generation failed");
}
m_ecdsa_core = ECDSA_Core(*mp_dom_pars, m_private_value, *mp_public_point);
}
/**
* EC_PrivateKey generator
**/
void EC_PrivateKey::generate_private_key(RandomNumberGenerator& rng)
{
if (mp_dom_pars.get() == 0)
{
throw Invalid_State("cannot generate private key when domain parameters are not set");
}
BigInt tmp_private_value(0);
tmp_private_value = BigInt::random_integer(rng, 1, mp_dom_pars->get_order() );
mp_public_point = std::auto_ptr<PointGFp>( new PointGFp (mp_dom_pars->get_base_point()));
mp_public_point->mult_this_secure(tmp_private_value, mp_dom_pars->get_order(), mp_dom_pars->get_order()-1);
//assert(mp_public_point.get() != 0);
tmp_private_value.swap(m_private_value);
}
/**
* Return the PKCS #8 public key encoder
**/
PKCS8_Encoder* EC_PrivateKey::pkcs8_encoder() const
{
class EC_Key_Encoder : public PKCS8_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
key->affirm_init();
SecureVector<byte> params = encode_der_ec_dompar ( * ( key->mp_dom_pars ), ENC_EXPLICIT );
return AlgorithmIdentifier ( key->get_oid(),
params );
}
MemoryVector<byte> key_bits() const
{
key->affirm_init();
SecureVector<byte> octstr_secret = BigInt::encode_1363 ( key->m_private_value, key->m_private_value.bytes() );
return DER_Encoder()
.start_cons ( SEQUENCE )
.encode ( BigInt ( 1 ) )
.encode ( octstr_secret, OCTET_STRING )
.end_cons()
.get_contents();
}
EC_Key_Encoder ( const EC_PrivateKey* k ) : key ( k )
{}
private:
const EC_PrivateKey* key;
};
return new EC_Key_Encoder(this);
}
/**
* Return the PKCS #8 public key decoder
*/
PKCS8_Decoder* EC_PrivateKey::pkcs8_decoder(RandomNumberGenerator&)
{
class EC_Key_Decoder : public PKCS8_Decoder
{
public:
void alg_id ( const AlgorithmIdentifier& alg_id )
{
key->mp_dom_pars.reset ( new EC_Domain_Params ( decode_ber_ec_dompar ( alg_id.parameters ) ) );
}
void key_bits ( const MemoryRegion<byte>& bits )
{
u32bit version;
SecureVector<byte> octstr_secret;
BER_Decoder ( bits )
.start_cons ( SEQUENCE )
.decode ( version )
.decode ( octstr_secret, OCTET_STRING )
.verify_end()
.end_cons();
key->m_private_value = BigInt::decode ( octstr_secret, octstr_secret.size() );
if ( version != 1 )
throw Decoding_Error ( "Wrong PKCS #1 key format version for EC key" );
key->PKCS8_load_hook();
}
EC_Key_Decoder ( EC_PrivateKey* k ) : key ( k )
{}
private:
EC_PrivateKey* key;
};
return new EC_Key_Decoder(this);
}
void EC_PrivateKey::PKCS8_load_hook ( bool )
{
// we cannot use affirm_init() here because mp_public_point might still be null
if (mp_dom_pars.get() == 0 )
{
throw Invalid_State("attempt to set public point for an uninitialized key");
}
mp_public_point.reset ( new PointGFp ( m_private_value * mp_dom_pars->get_base_point() ) );
mp_public_point->check_invariants();
}
/*************************************************
* ECDSA_PublicKey *
*************************************************/
void ECDSA_PublicKey::affirm_init() const // virtual
{
EC_PublicKey::affirm_init();
}
void ECDSA_PublicKey::set_domain_parameters(EC_Domain_Params const& dom_pars)
{
if (mp_dom_pars.get())
{
// they are already set, we must ensure that they are equal to the arg
if (dom_pars != *mp_dom_pars.get())
{
throw Invalid_Argument("EC_PublicKey::set_domain_parameters(): domain parameters are already set, and they are different from the argument");
}
else
{
// they are equal, so nothing to do
return;
}
}
// set them ...
if (m_enc_public_point.size() == 0)
{
throw Invalid_State("EC_PublicKey::set_domain_parameters(): encoded public point isn´t set");
}
// now try to decode the public key ...
PointGFp tmp_pp(OS2ECP(m_enc_public_point, dom_pars.get_curve()));
try
{
tmp_pp.check_invariants();
}
catch(Illegal_Point e)
{
throw Invalid_State("EC_PublicKey::set_domain_parameters(): point does not lie on provided curve");
}
std::auto_ptr<EC_Domain_Params> p_tmp_pars(new EC_Domain_Params(dom_pars));
ECDSA_Core tmp_ecdsa_core( *p_tmp_pars, BigInt ( 0 ), tmp_pp );
mp_public_point.reset(new PointGFp(tmp_pp));
m_ecdsa_core = tmp_ecdsa_core;
mp_dom_pars = p_tmp_pars;
}
void ECDSA_PublicKey::set_all_values ( ECDSA_PublicKey const& other )
{
m_param_enc = other.m_param_enc;
m_ecdsa_core = other.m_ecdsa_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 ) ) );
}
}
ECDSA_PublicKey::ECDSA_PublicKey ( ECDSA_PublicKey const& other )
: Public_Key(),
EC_PublicKey(),
PK_Verifying_wo_MR_Key()
{
set_all_values ( other );
}
ECDSA_PublicKey const& ECDSA_PublicKey::operator= ( ECDSA_PublicKey const& rhs )
{
set_all_values ( rhs );
return *this;
}
bool ECDSA_PublicKey::verify ( const byte message[], u32bit mess_len, const byte signature [], u32bit sig_len ) const
{
affirm_init();
ECDSA_Signature sig;
std::auto_ptr<ECDSA_Signature_Decoder> dec(sig.x509_decoder());
SecureVector<byte> sv_sig;
sv_sig.set ( signature, sig_len );
dec->signature_bits ( sv_sig );
SecureVector<byte> sv_plain_sig = sig.get_concatenation();
return m_ecdsa_core.verify ( sv_plain_sig, sv_plain_sig.size(), message, mess_len );
}
ECDSA_PublicKey::ECDSA_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 ) );
m_param_enc = ENC_EXPLICIT;
m_ecdsa_core = ECDSA_Core ( *mp_dom_pars, BigInt ( 0 ), *mp_public_point );
}
void ECDSA_PublicKey::X509_load_hook()
{
EC_PublicKey::X509_load_hook();
EC_PublicKey::affirm_init();
m_ecdsa_core = ECDSA_Core ( *mp_dom_pars, BigInt ( 0 ), *mp_public_point );
}
u32bit ECDSA_PublicKey::max_input_bits() const
{
if(!mp_dom_pars.get())
{
throw Invalid_State("ECDSA_PublicKey::max_input_bits(): domain parameters not set");
}
return mp_dom_pars->get_order().bits();
}
/*************************
* ECDSA_PrivateKey *
*************************/
void ECDSA_PrivateKey::affirm_init() const // virtual
{
EC_PrivateKey::affirm_init();
}
void ECDSA_PrivateKey::PKCS8_load_hook ( bool generated )
{
EC_PrivateKey::PKCS8_load_hook ( generated );
EC_PrivateKey::affirm_init();
m_ecdsa_core = ECDSA_Core ( *mp_dom_pars, m_private_value, *mp_public_point );
}
void ECDSA_PrivateKey::set_all_values ( ECDSA_PrivateKey const& other )
{
m_private_value = other.m_private_value;
m_param_enc = other.m_param_enc;
m_ecdsa_core = other.m_ecdsa_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 ) ) );
}
}
ECDSA_PrivateKey::ECDSA_PrivateKey(ECDSA_PrivateKey const& other)
: Public_Key(),
EC_PublicKey(),
Private_Key(),
ECDSA_PublicKey(),
EC_PrivateKey(),
PK_Signing_Key()
{
set_all_values(other);
}
ECDSA_PrivateKey const& ECDSA_PrivateKey::operator= (ECDSA_PrivateKey const& rhs)
{
set_all_values(rhs);
return *this;
}
SecureVector<byte> ECDSA_PrivateKey::sign ( const byte message [], u32bit mess_len, RandomNumberGenerator&) const
{
affirm_init();
SecureVector<byte> sv_sig = m_ecdsa_core.sign ( message, mess_len );
//code which der encodes the signature returned
ECDSA_Signature sig = decode_concatenation( sv_sig );
std::auto_ptr<ECDSA_Signature_Encoder> enc(sig.x509_encoder());
return enc->signature_bits();
}
/*********************************
* 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;
}
/**
* Derive a key
*/
SecureVector<byte> ECKAEG_PrivateKey::derive_key(const Public_Key& key) const
{
affirm_init();
const EC_PublicKey * p_ec_pk = dynamic_cast<const EC_PublicKey*>(&key);
if(!p_ec_pk)
{
throw Invalid_Argument("ECKAEG_PrivateKey::derive_key(): argument must be an EC_PublicKey");
}
p_ec_pk->affirm_init();
return m_eckaeg_core.agree ( p_ec_pk->get_public_point() );
}
}
|