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/*
* ECC Key implemenation
* (C) 2007 Manuel Hartl, FlexSecure GmbH
* Falko Strenzke, FlexSecure GmbH
* 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/ecc_key.h>
#include <botan/x509_key.h>
#include <botan/numthry.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/secmem.h>
#include <botan/point_gfp.h>
namespace Botan {
EC_PublicKey::EC_PublicKey(const EC_Domain_Params& dom_par,
const PointGFp& pub_point) :
domain_params(dom_par), public_key(pub_point),
domain_encoding(EC_DOMPAR_ENC_EXPLICIT)
{
if(domain().get_curve() != public_point().get_curve())
throw Invalid_Argument("EC_PublicKey: curve mismatch in constructor");
try
{
public_key.check_invariants();
}
catch(Illegal_Point)
{
throw Invalid_State("Public key failed invariant check");
}
}
AlgorithmIdentifier EC_PublicKey::algorithm_identifier() const
{
return AlgorithmIdentifier(get_oid(), DER_domain());
}
MemoryVector<byte> EC_PublicKey::x509_subject_public_key() const
{
return EC2OSP(public_point(), PointGFp::COMPRESSED);
}
void EC_PublicKey::X509_load_hook()
{
try
{
public_point().check_invariants();
}
catch(Illegal_Point)
{
throw Decoding_Error("Invalid public point; not on curve");
}
}
EC_PublicKey::EC_PublicKey(const AlgorithmIdentifier& alg_id,
const MemoryRegion<byte>& key_bits)
{
domain_params = EC_Domain_Params(alg_id.parameters);
public_key = PointGFp(OS2ECP(key_bits, domain().get_curve()));
try
{
public_point().check_invariants();
}
catch(Illegal_Point)
{
throw Decoding_Error("Invalid public point; not on curve");
}
}
void EC_PublicKey::set_parameter_encoding(EC_Domain_Params_Encoding form)
{
if(form != EC_DOMPAR_ENC_EXPLICIT &&
form != EC_DOMPAR_ENC_IMPLICITCA &&
form != EC_DOMPAR_ENC_OID)
throw Invalid_Argument("Invalid encoding form for EC-key object specified");
if((form == EC_DOMPAR_ENC_OID) && (domain_params.get_oid() == ""))
throw Invalid_Argument("Invalid encoding form OID specified for "
"EC-key object whose corresponding domain "
"parameters are without oid");
domain_encoding = form;
}
const BigInt& EC_PrivateKey::private_value() const
{
if(private_key == 0)
throw Invalid_State("EC_PrivateKey::private_value - uninitialized");
return private_key;
}
/**
* EC_PrivateKey generator
**/
EC_PrivateKey::EC_PrivateKey(const EC_Domain_Params& dom_par,
const BigInt& priv_key) :
EC_PublicKey(dom_par, dom_par.get_base_point() * private_key),
private_key(priv_key)
{
}
/**
* EC_PrivateKey generator
**/
EC_PrivateKey::EC_PrivateKey(RandomNumberGenerator& rng,
const EC_Domain_Params& dom_par)
{
domain_params = dom_par;
private_key = BigInt::random_integer(rng, 1, domain().get_order());
public_key = domain().get_base_point() * private_key;
try
{
public_key.check_invariants();
}
catch(Illegal_Point)
{
throw Internal_Error("ECC private key generation failed");
}
}
MemoryVector<byte> EC_PrivateKey::pkcs8_private_key() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(BigInt(1))
.encode(BigInt::encode_1363(private_key, private_key.bytes()),
OCTET_STRING)
.end_cons()
.get_contents();
}
/**
* 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->domain_params = EC_Domain_Params(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();
if(version != 1)
throw Decoding_Error("Wrong key format version for EC key");
key->private_key = BigInt::decode(octstr_secret,
octstr_secret.size());
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)
{
public_key = domain().get_base_point() * private_key;
}
}
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