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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.
*/
/*****************************************************************************
BotanDSAPrivateKey.cpp
Botan DSA private key class
*****************************************************************************/
#include "config.h"
#include "log.h"
#include "BotanDSAPrivateKey.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/oids.h>
#include <botan/version.h>
// Constructors
BotanDSAPrivateKey::BotanDSAPrivateKey()
{
dsa = NULL;
}
BotanDSAPrivateKey::BotanDSAPrivateKey(const Botan::DSA_PrivateKey* inDSA)
{
dsa = NULL;
setFromBotan(inDSA);
}
// Destructor
BotanDSAPrivateKey::~BotanDSAPrivateKey()
{
delete dsa;
}
// The type
/*static*/ const char* BotanDSAPrivateKey::type = "Botan DSA Private Key";
// Set from Botan representation
void BotanDSAPrivateKey::setFromBotan(const Botan::DSA_PrivateKey* inDSA)
{
ByteString inP = BotanUtil::bigInt2ByteString(inDSA->group_p());
setP(inP);
ByteString inQ = BotanUtil::bigInt2ByteString(inDSA->group_q());
setQ(inQ);
ByteString inG = BotanUtil::bigInt2ByteString(inDSA->group_g());
setG(inG);
ByteString inX = BotanUtil::bigInt2ByteString(inDSA->get_x());
setX(inX);
}
// Check if the key is of the given type
bool BotanDSAPrivateKey::isOfType(const char* inType)
{
return !strcmp(type, inType);
}
// Setters for the DSA private key components
void BotanDSAPrivateKey::setX(const ByteString& inX)
{
DSAPrivateKey::setX(inX);
if (dsa)
{
delete dsa;
dsa = NULL;
}
}
// Setters for the DSA domain parameters
void BotanDSAPrivateKey::setP(const ByteString& inP)
{
DSAPrivateKey::setP(inP);
if (dsa)
{
delete dsa;
dsa = NULL;
}
}
void BotanDSAPrivateKey::setQ(const ByteString& inQ)
{
DSAPrivateKey::setQ(inQ);
if (dsa)
{
delete dsa;
dsa = NULL;
}
}
void BotanDSAPrivateKey::setG(const ByteString& inG)
{
DSAPrivateKey::setG(inG);
if (dsa)
{
delete dsa;
dsa = NULL;
}
}
// Encode into PKCS#8 DER
ByteString BotanDSAPrivateKey::PKCS8Encode()
{
ByteString der;
createBotanKey();
if (dsa == NULL) return der;
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
const Botan::secure_vector<Botan::byte> ber = Botan::PKCS8::BER_encode(*dsa);
#else
const Botan::SecureVector<Botan::byte> ber = Botan::PKCS8::BER_encode(*dsa);
#endif
der.resize(ber.size());
memcpy(&der[0], &ber[0], ber.size());
return der;
}
// Decode from PKCS#8 BER
bool BotanDSAPrivateKey::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::DSA_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("DSA"))
{
ERROR_MSG("Decoded private key not DSA");
return false;
}
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,34)
key = new Botan::DSA_PrivateKey(alg_id, keydata);
#else
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
key = new Botan::DSA_PrivateKey(alg_id, keydata, *rng->getRNG());
#endif
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::DSA_PrivateKey* BotanDSAPrivateKey::getBotanKey()
{
if (!dsa)
{
createBotanKey();
}
return dsa;
}
// Create the Botan representation of the key
void BotanDSAPrivateKey::createBotanKey()
{
// y is not needed
// Todo: Either q or x is needed. Both is not needed
if (p.size() != 0 &&
q.size() != 0 &&
g.size() != 0 &&
x.size() != 0)
{
if (dsa)
{
delete dsa;
dsa = NULL;
}
try
{
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
dsa = new Botan::DSA_PrivateKey(*rng->getRNG(),
Botan::DL_Group(BotanUtil::byteString2bigInt(p),
BotanUtil::byteString2bigInt(q),
BotanUtil::byteString2bigInt(g)),
BotanUtil::byteString2bigInt(x));
}
catch (...)
{
ERROR_MSG("Could not create the Botan private key");
}
}
}
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