/*
 * 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.
 */


/*
 * DigestObject.h - generic virtual Digest base class 
 */

#ifndef	_DIGEST_OBJECT_H_
#define _DIGEST_OBJECT_H_

#include <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.h>
#include <Security/context.h>

/* common virtual digest class */
class DigestObject {
public:
	DigestObject() : mInitFlag(false), mIsDone(false) { }
	virtual ~DigestObject() { }
	
	/* 
	 * The remaining functions must be implemented by subclass. 
	 */
	/* init is reusable */
	virtual void digestInit() = 0;

	/* add some data */
	virtual void digestUpdate(
		const void *data, 
		size_t 		len) = 0;
	
	/* obtain digest (once only per init, update, ... cycle) */
	virtual void digestFinal(
		void 		*digest) = 0;  	/* RETURNED, alloc'd by caller */
										
	virtual size_t digestSizeInBytes() const = 0;

protected:
	bool			mInitFlag;
	bool			mIsDone;	
			
	bool			initFlag() 				{ return mInitFlag; }
	void			setInitFlag(bool flag) 	{ mInitFlag = flag; }
	bool			isDone() 				{ return mIsDone; }
	void			setIsDone(bool done) 	{ mIsDone = done; }
};

#endif	/* _DIGEST_OBJECT_H_ */