/*
 * Copyright (c) 2010 .SE (The Internet Infrastructure Foundation)
 * All rights reserved.
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 * modification, are permitted provided that the following conditions
 * are met:
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 * 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
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/*****************************************************************************
 BotanDSAPublicKey.cpp

 Botan DSA public key class
 *****************************************************************************/

#include "config.h"
#include "log.h"
#include "BotanDSAPublicKey.h"
#include "BotanUtil.h"
#include <string.h>

// Constructors
BotanDSAPublicKey::BotanDSAPublicKey()
{
	dsa = NULL;
}

BotanDSAPublicKey::BotanDSAPublicKey(const Botan::DSA_PublicKey* inDSA)
{
	dsa = NULL;

	setFromBotan(inDSA);
}

// Destructor
BotanDSAPublicKey::~BotanDSAPublicKey()
{
	delete dsa;
}

// The type
/*static*/ const char* BotanDSAPublicKey::type = "Botan DSA Public Key";

// Set from Botan representation
void BotanDSAPublicKey::setFromBotan(const Botan::DSA_PublicKey* 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 inY = BotanUtil::bigInt2ByteString(inDSA->get_y());
	setY(inY);
}

// Check if the key is of the given type
bool BotanDSAPublicKey::isOfType(const char* inType)
{
	return !strcmp(type, inType);
}

// Setters for the DSA public key components
void BotanDSAPublicKey::setP(const ByteString& inP)
{
	DSAPublicKey::setP(inP);

	if (dsa)
	{
		delete dsa;
		dsa = NULL;
	}
}

void BotanDSAPublicKey::setQ(const ByteString& inQ)
{
	DSAPublicKey::setQ(inQ);

	if (dsa)
	{
		delete dsa;
		dsa = NULL;
	}
}

void BotanDSAPublicKey::setG(const ByteString& inG)
{
	DSAPublicKey::setG(inG);

	if (dsa)
	{
		delete dsa;
		dsa = NULL;
	}
}

void BotanDSAPublicKey::setY(const ByteString& inY)
{
	DSAPublicKey::setY(inY);

	if (dsa)
	{
		delete dsa;
		dsa = NULL;
	}
}

// Retrieve the Botan representation of the key
Botan::DSA_PublicKey* BotanDSAPublicKey::getBotanKey()
{
	if (!dsa)
	{
		createBotanKey();
	}

	return dsa;
}

// Create the Botan representation of the key
void BotanDSAPublicKey::createBotanKey()
{
	// We actually do not need to check q, since it can be set zero
	if (p.size() != 0 &&
	    g.size() != 0 &&
	    y.size() != 0)
	{
		if (dsa)
		{
			delete dsa;
			dsa = NULL;
		}

		try
		{
			dsa = new Botan::DSA_PublicKey(Botan::DL_Group(BotanUtil::byteString2bigInt(p),
							BotanUtil::byteString2bigInt(q),
							BotanUtil::byteString2bigInt(g)),
							BotanUtil::byteString2bigInt(y));
		}
		catch (...)
		{
			ERROR_MSG("Could not create the Botan public key");
		}
	}
}