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/*
* Copyright (c) 2010 .SE (The Internet Infrastructure Foundation)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*****************************************************************************
BotanECDSAPrivateKey.cpp
Botan ECDSA private key class
*****************************************************************************/
#include "config.h"
#ifdef WITH_ECC
#include "log.h"
#include "BotanECDSAPrivateKey.h"
#include "BotanCryptoFactory.h"
#include "BotanRNG.h"
#include "BotanUtil.h"
#include <string.h>
#include <botan/pkcs8.h>
#include <botan/ber_dec.h>
#include <botan/der_enc.h>
#include <botan/asn1_oid.h>
#include <botan/oids.h>
#include <botan/version.h>
// Constructors
BotanECDSAPrivateKey::BotanECDSAPrivateKey()
{
eckey = NULL;
}
BotanECDSAPrivateKey::BotanECDSAPrivateKey(const Botan::ECDSA_PrivateKey* inECKEY)
{
eckey = NULL;
setFromBotan(inECKEY);
}
// Destructor
BotanECDSAPrivateKey::~BotanECDSAPrivateKey()
{
delete eckey;
}
// The type
/*static*/ const char* BotanECDSAPrivateKey::type = "Botan ECDSA Private Key";
// Get the base point order length
unsigned long BotanECDSAPrivateKey::getOrderLength() const
{
try
{
Botan::EC_Group group = BotanUtil::byteString2ECGroup(ec);
return group.get_order().bytes();
}
catch (...)
{
ERROR_MSG("Can't get EC group for order length");
return 0;
}
}
// Set from Botan representation
void BotanECDSAPrivateKey::setFromBotan(const Botan::ECDSA_PrivateKey* inECKEY)
{
ByteString inEC = BotanUtil::ecGroup2ByteString(inECKEY->domain());
setEC(inEC);
ByteString inD = BotanUtil::bigInt2ByteString(inECKEY->private_value());
setD(inD);
}
// Check if the key is of the given type
bool BotanECDSAPrivateKey::isOfType(const char* inType)
{
return !strcmp(type, inType);
}
// Setters for the ECDSA private key components
void BotanECDSAPrivateKey::setD(const ByteString& inD)
{
ECPrivateKey::setD(inD);
if (eckey)
{
delete eckey;
eckey = NULL;
}
}
// Setters for the ECDSA public key components
void BotanECDSAPrivateKey::setEC(const ByteString& inEC)
{
ECPrivateKey::setEC(inEC);
if (eckey)
{
delete eckey;
eckey = NULL;
}
}
// Encode into PKCS#8 DER
ByteString BotanECDSAPrivateKey::PKCS8Encode()
{
ByteString der;
createBotanKey();
if (eckey == NULL) return der;
// Force EC_DOMPAR_ENC_OID
const size_t PKCS8_VERSION = 0;
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(2,0,0)
const std::vector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(eckey->get_oid(), parameters);
const Botan::secure_vector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->private_key_bits(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#elif BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
const std::vector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(eckey->get_oid(), parameters);
const Botan::secure_vector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->pkcs8_private_key(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#else
const Botan::MemoryVector<Botan::byte> parameters = eckey->domain().DER_encode(Botan::EC_DOMPAR_ENC_OID);
const Botan::AlgorithmIdentifier alg_id(eckey->get_oid(), parameters);
const Botan::SecureVector<Botan::byte> ber =
Botan::DER_Encoder()
.start_cons(Botan::SEQUENCE)
.encode(PKCS8_VERSION)
.encode(alg_id)
.encode(eckey->pkcs8_private_key(), Botan::OCTET_STRING)
.end_cons()
.get_contents();
#endif
der.resize(ber.size());
memcpy(&der[0], &ber[0], ber.size());
return der;
}
// Decode from PKCS#8 BER
bool BotanECDSAPrivateKey::PKCS8Decode(const ByteString& ber)
{
Botan::DataSource_Memory source(ber.const_byte_str(), ber.size());
if (source.end_of_data()) return false;
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
Botan::secure_vector<Botan::byte> keydata;
#else
Botan::SecureVector<Botan::byte> keydata;
#endif
Botan::AlgorithmIdentifier alg_id;
Botan::ECDSA_PrivateKey* key = NULL;
try
{
Botan::BER_Decoder(source)
.start_cons(Botan::SEQUENCE)
.decode_and_check<size_t>(0, "Unknown PKCS #8 version number")
.decode(alg_id)
.decode(keydata, Botan::OCTET_STRING)
.discard_remaining()
.end_cons();
if (keydata.empty())
throw Botan::Decoding_Error("PKCS #8 private key decoding failed");
if (Botan::OIDS::lookup(alg_id.oid).compare("ECDSA"))
{
ERROR_MSG("Decoded private key not ECDSA");
return false;
}
key = new Botan::ECDSA_PrivateKey(alg_id, keydata);
if (key == NULL) return false;
setFromBotan(key);
delete key;
}
catch (std::exception& e)
{
ERROR_MSG("Decode failed on %s", e.what());
return false;
}
return true;
}
// Retrieve the Botan representation of the key
Botan::ECDSA_PrivateKey* BotanECDSAPrivateKey::getBotanKey()
{
if (!eckey)
{
createBotanKey();
}
return eckey;
}
// Create the Botan representation of the key
void BotanECDSAPrivateKey::createBotanKey()
{
if (ec.size() != 0 &&
d.size() != 0)
{
if (eckey)
{
delete eckey;
eckey = NULL;
}
try
{
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
Botan::EC_Group group = BotanUtil::byteString2ECGroup(ec);
eckey = new Botan::ECDSA_PrivateKey(*rng->getRNG(),
group,
BotanUtil::byteString2bigInt(d));
}
catch (...)
{
ERROR_MSG("Could not create the Botan public key");
}
}
}
#endif
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