/*
 * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
 * 
 * The contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License. Please obtain
 * a copy of the License at http://www.apple.com/publicsource and read it before
 * using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
 * specific language governing rights and limitations under the License.
 */


//
// devrandom - RNG operations based on /dev/random
//
#ifndef _H_DEVRANDOM
#define _H_DEVRANDOM

#include <Security/utilities.h>
#include <Security/unix++.h>
#include <Security/globalizer.h>


namespace Security {


//
// This RNG uses /dev/random.
// It is not repeatable. AddEntropy() contributes random entropy to a global pool (only).
//
class DevRandomGenerator {
public:
    DevRandomGenerator(bool writable = false);
    
    void random(void *data, size_t length);
    void addEntropy(const void *data, size_t length);

private:
    static ModuleNexus<UnixPlusPlus::FileDesc> mDevRandom;
};


}; 	// end namespace Security


#endif //_H_DEVRANDOM
