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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 {
void EC_PublicKey::X509_load_hook()
{
try
{
public_point().check_invariants();
}
catch(Illegal_Point)
{
throw Decoding_Error("Invalid public point; not on curve");
}
}
X509_Encoder* EC_PublicKey::x509_encoder() const
{
class EC_Key_Encoder : public X509_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
return AlgorithmIdentifier(key->get_oid(),
key->domain().DER_encode(key->domain_format()));
}
MemoryVector<byte> key_bits() const
{
return EC2OSP(key->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->domain_params = EC_Domain_Params(alg_id.parameters);
}
void key_bits(const MemoryRegion<byte>& bits)
{
key->public_key = PointGFp(
OS2ECP(bits, key->domain().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_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("cannot use EC_PrivateKey when private key is uninitialized");
return private_key;
}
/**
* EC_PrivateKey generator
**/
void EC_PrivateKey::generate_private_key(RandomNumberGenerator& rng)
{
if(!domain().initialized())
throw Invalid_State("Cannot generate new EC key, domain unset");
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& e)
{
throw Invalid_State(algo_name() + " key generation failed");
}
}
/**
* 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
{
return AlgorithmIdentifier(key->get_oid(),
key->domain().DER_encode(EC_DOMPAR_ENC_EXPLICIT));
}
MemoryVector<byte> key_bits() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(BigInt(1))
.encode(BigInt::encode_1363(key->private_key, key->private_key.bytes()),
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->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();
key->private_key = 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)
{
public_key = domain().get_base_point() * private_key;
}
}
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