[apple/security.git] / libsecurity_apple_csp / lib / bfContext.h

/*
 * 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.
 */


/*
 * bfContext.h - glue between BlockCrytpor and ssleay Blowfish
 *				 implementation
 * Written by Doug Mitchell 4/23/2003
 */
 
#ifndef _BF_CONTEXT_H_
#define _BF_CONTEXT_H_

#include "AppleCSPContext.h"
#include "BlockCryptor.h"
#include <openssl/blowfish.h>

class BlowfishContext : public BlockCryptor {
public:
	BlowfishContext(AppleCSPSession &session) :
		BlockCryptor(session),
		mInitFlag(false),
		mRawKeySize(0)	{ }
	~BlowfishContext();
	
	// called by CSPFullPluginSession
	void init(const Context &context, bool encoding = true);

	// As an optimization, we allow reuse of a modified context. 
	// The main thing we avoid is a redundant key scheduling. We 
	// save the current raw keys bits in mRawKey and compare on 
	// re-init.
	bool changed(const Context &context)	 { return true; }

	// called by BlockCryptor
	void encryptBlock(
		const void		*plainText,		// length implied (one block)
		size_t			plainTextLen,
		void			*cipherText,	
		size_t			&cipherTextLen,	// in/out, throws on overflow
		bool			final);
	void decryptBlock(
		const void		*cipherText,	// length implied (one cipher block)
		size_t			cipherTextLen,
		void			*plainText,	
		size_t			&plainTextLen,	// in/out, throws on overflow
		bool			final);
	
private:
	void deleteKey();

	/* scheduled key */
	BF_KEY				mBfKey;
	bool				mInitFlag;			// for easy reuse

	/* 
	 * Raw key bits saved here and checked on re-init to avoid 
	 * extra key schedule 
	 */
	uint8				mRawKey[BF_MAX_KEY_SIZE_BYTES];
	uint32				mRawKeySize;

	
};	/* BlowfishContext */

#endif //_BF_CONTEXT_H_
Commit	Line	Data
b1ab9ed8 A	1	/*
	2	* Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
	3	*
	4	* The contents of this file constitute Original Code as defined in and are
	5	* subject to the Apple Public Source License Version 1.2 (the 'License').
	6	* You may not use this file except in compliance with the License. Please obtain
	7	* a copy of the License at http://www.apple.com/publicsource and read it before
	8	* using this file.
	9	*
	10	* This Original Code and all software distributed under the License are
	11	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
	12	* OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
	13	* LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
	14	* PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
	15	* specific language governing rights and limitations under the License.
	16	*/
	17
	18
	19	/*
	20	* bfContext.h - glue between BlockCrytpor and ssleay Blowfish
	21	* implementation
	22	* Written by Doug Mitchell 4/23/2003
	23	*/
	24
	25	#ifndef _BF_CONTEXT_H_
	26	#define _BF_CONTEXT_H_
	27
	28	#include "AppleCSPContext.h"
	29	#include "BlockCryptor.h"
b1ab9ed8 A	30	#include <openssl/blowfish.h>
	31
	32	class BlowfishContext : public BlockCryptor {
	33	public:
	34	BlowfishContext(AppleCSPSession &session) :
	35	BlockCryptor(session),
	36	mInitFlag(false),
	37	mRawKeySize(0) { }
	38	~BlowfishContext();
	39
	40	// called by CSPFullPluginSession
	41	void init(const Context &context, bool encoding = true);
	42
	43	// As an optimization, we allow reuse of a modified context.
	44	// The main thing we avoid is a redundant key scheduling. We
	45	// save the current raw keys bits in mRawKey and compare on
	46	// re-init.
	47	bool changed(const Context &context) { return true; }
	48
	49	// called by BlockCryptor
	50	void encryptBlock(
	51	const void *plainText, // length implied (one block)
	52	size_t plainTextLen,
	53	void *cipherText,
	54	size_t &cipherTextLen, // in/out, throws on overflow
	55	bool final);
	56	void decryptBlock(
	57	const void *cipherText, // length implied (one cipher block)
	58	size_t cipherTextLen,
	59	void *plainText,
	60	size_t &plainTextLen, // in/out, throws on overflow
	61	bool final);
	62
	63	private:
	64	void deleteKey();
	65
	66	/* scheduled key */
	67	BF_KEY mBfKey;
	68	bool mInitFlag; // for easy reuse
	69
	70	/*
	71	* Raw key bits saved here and checked on re-init to avoid
	72	* extra key schedule
	73	*/
	74	uint8 mRawKey[BF_MAX_KEY_SIZE_BYTES];
	75	uint32 mRawKeySize;
	76
	77
	78	}; /* BlowfishContext */
	79
	80	#endif //_BF_CONTEXT_H_