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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.
*/
/*****************************************************************************
BotanEDPublicKey.cpp
Botan EDDSA public key class
*****************************************************************************/
#include "config.h"
#ifdef WITH_EDDSA
#include "log.h"
#include "BotanEDPublicKey.h"
#include "BotanUtil.h"
#include "DerUtil.h"
#include <string.h>
#include <botan/curve25519.h>
#include <botan/ed25519.h>
// #include <botan/curve448.h>
// #include <botan/ed448.h>
const Botan::OID x25519_oid("1.3.101.110");
// const Botan::OID x448_oid("1.3.101.111");
const Botan::OID ed25519_oid("1.3.101.112");
// const Botan::OID ed448_oid("1.3.101.113");
// Constructors
BotanEDPublicKey::BotanEDPublicKey()
{
edkey = NULL;
}
BotanEDPublicKey::BotanEDPublicKey(const Botan::Public_Key* inEDKEY)
{
edkey = NULL;
setFromBotan(inEDKEY);
}
// Destructor
BotanEDPublicKey::~BotanEDPublicKey()
{
delete edkey;
}
// The type
/*static*/ const char* BotanEDPublicKey::type = "Botan EDDSA Public Key";
// Get the base point order length
unsigned long BotanEDPublicKey::getOrderLength() const
{
// Only Ed25519 is supported
return 32;
}
// Set from Botan representation
void BotanEDPublicKey::setFromBotan(const Botan::Public_Key* inEDKEY)
{
Botan::OID oid;
std::vector<uint8_t> pub;
for (;;)
{
const Botan::Curve25519_PublicKey* x25519 = dynamic_cast<const Botan::Curve25519_PublicKey*>(inEDKEY);
if (x25519) {
oid = x25519_oid;
pub = x25519->public_value();
break;
}
const Botan::Ed25519_PublicKey* ed25519 = dynamic_cast<const Botan::Ed25519_PublicKey*>(inEDKEY);
if (ed25519) {
oid = ed25519_oid;
pub = ed25519->get_public_key();
break;
}
return;
}
ByteString inEC = BotanUtil::oid2ByteString(oid);
setEC(inEC);
ByteString inA;
inA.resize(pub.size());
memcpy(&inA[0], &pub[0], pub.size());
setA(DERUTIL::raw2Octet(inA));
}
// Check if the key is of the given type
bool BotanEDPublicKey::isOfType(const char* inType)
{
return !strcmp(type, inType);
}
// Setters for the EDDSA public key components
void BotanEDPublicKey::setEC(const ByteString& inEC)
{
EDPublicKey::setEC(inEC);
if (edkey)
{
delete edkey;
edkey = NULL;
}
}
void BotanEDPublicKey::setA(const ByteString& inA)
{
EDPublicKey::setA(inA);
if (edkey)
{
delete edkey;
edkey = NULL;
}
}
// Retrieve the Botan representation of the key
Botan::Public_Key* BotanEDPublicKey::getBotanKey()
{
if (!edkey)
{
createBotanKey();
}
return edkey;
}
// Create the Botan representation of the key
void BotanEDPublicKey::createBotanKey()
{
if (ec.size() != 0 &&
a.size() != 0)
{
if (edkey)
{
delete edkey;
edkey = NULL;
}
try
{
ByteString raw = DERUTIL::octet2Raw(a);
size_t len = raw.size();
if (len == 0) return;
std::vector<uint8_t> pub(len);
memcpy(&pub[0], raw.const_byte_str(), len);
Botan::OID oid = BotanUtil::byteString2Oid(ec);
if (oid == x25519_oid)
{
edkey = new Botan::Curve25519_PublicKey(pub);
}
else if (oid == ed25519_oid)
{
edkey = new Botan::Ed25519_PublicKey(pub);
}
}
catch (...)
{
ERROR_MSG("Could not create the Botan public key");
}
}
}
#endif
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