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/*************************************************
* ECC Key implemenation *
* (C) 2007 Manuel Hartl / FlexSecure GmbH *
* *
* Falko Strenzke *
* strenzke@flexsecure.de *
*************************************************/
#include <botan/ecc_key.h>
#include <botan/x509_key.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");
}
}
/**
* 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();
}
}
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