/*
 * Copyright (c) 2010-2011 Juli Mallett. 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
 */

#ifndef	CRYPTO_CRYPTO_RANDOM_H
#define	CRYPTO_CRYPTO_RANDOM_H

#include <event/action.h>
#include <event/event_callback.h>

////////////////////////////////////////////////////////////////////////////////
//                                                                            //
// File:           crypto_random.h                                            //
// Description:    basic encryption machinery                                 //
// Project:        WANProxy XTech                                             //
// Adapted by:     Andreu Vidal Bramfeld-Software                             //
// Last modified:  2015-04-01                                                 //
//                                                                            //
////////////////////////////////////////////////////////////////////////////////

class CryptoRandomMethod;

/*
 * XXX
 * Add a CryptoTypeBest, which will use whatever the best, available method is.
 */
enum CryptoRandomType {
	CryptoTypeRNG,
	CryptoTypePRNG,
};

class CryptoRandomSession {
protected:
	CryptoRandomSession(void)
	{ }

public:
	virtual ~CryptoRandomSession()
	{ }

	//virtual Action *generate(size_t, EventCallback *) = 0;
};

class CryptoRandomMethod {
protected:
	CryptoRandomMethod(void)
	{ }

	virtual ~CryptoRandomMethod()
	{ }
public:
	virtual bool generate(CryptoRandomType, size_t, Buffer *) const = 0;
	virtual CryptoRandomSession *session(CryptoRandomType) const = 0;

	/* XXX Registration API somehow.  */
	static const CryptoRandomMethod *default_method;
};

#endif /* !CRYPTO_CRYPTO_RANDOM_H */