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os/security/crypto/weakcryptospi/source/symmetric/rc2shim.h
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     1 /*

     2 * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 * RC2 shim classes definition

    16 *

    17 */

    18 

    19 

    20 /**

    21  @file

    22  @internalComponent

    23  @released

    24 */

    25 

    26 #ifndef __RC2SHIM_H__

    27 #define __RC2SHIM_H__

    28 

    29 #include <rc2.h>

    30 

    31 namespace CryptoSpi

    32 	{

    33 	class CCryptoParams;

    34 	class CSymmetricCipher;

    35 	class CKey;

    36 	}

    37 	

    38 NONSHARABLE_CLASS(CRC2EncryptorShim) : public CRC2Encryptor

    39 {

    40 public:

    41 	/**

    42 	Creates an CRC2EncryptorShim object which has the same interface

    43 	as RC2 Encryptor but delegates all work to a Crypto SPI plug-in.

    44 	

    45 	@param aKey The encryption key

    46 	@return A pointer to a CRC2EncryptorShim instance

    47 	*/

    48 	static CRC2EncryptorShim* NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);

    49 	

    50 	/**

    51 	Creates an CRC2EncryptorShim object which has the same interface

    52 	as RC2 Encryptor but delegates all work to a Crypto SPI plug-in.

    53 	

    54 	A pointer to the new object is placed on the cleanup stack

    55 	

    56 	@param aKey The encryption key

    57 	@return A pointer to a CRC2EncryptorShim instance

    58 	*/

    59 	static CRC2EncryptorShim* NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits);

    60 	

    61 	// From CBlockTransform

    62 	TInt BlockSize() const;

    63 	void Transform(TDes8& aBlock);

    64 	void Reset(void);

    65 	TInt KeySize(void) const;

    66 	

    67 	/// Destructor

    68 	~CRC2EncryptorShim();

    69 		

    70 private:

    71 	/// Constructor

    72 	CRC2EncryptorShim();

    73 	void ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);	

    74 	

    75 	// From CBase

    76 	TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);

    77 	

    78 private:

    79 	/// SPI delegate

    80 	CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;

    81 		

    82 	/// SPI requires all key to passed as key-objects

    83 	CryptoSpi::CKey* iKey;		

    84 	

    85 	/// Temporary output block, SPI does not overwrite input

    86 	/// RC2 uses 64bit blocks

    87 	TBuf8<16> iOutputBlock;

    88 	

    89 	/// The effective key length is passed as an algorithm

    90 	/// parameter. This allows it to be externalised.

    91 	CryptoSpi::CCryptoParams* iAlgorithmParams;	

    92 };

    93 

    94 NONSHARABLE_CLASS(CRC2DecryptorShim) : public CRC2Decryptor

    95 {

    96 public:

    97 	/**

    98 	Creates an CRC2DecryptorShim object which has the same interface

    99 	as RC2 Decryptor but delegates all work to a Crypto SPI plug-in.

   100 	

   101 	@param aKey The decryption key

   102 	@return A pointer to a CRC2DecryptorShim instance

   103 	*/

   104 	static CRC2DecryptorShim* NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);

   105 	

   106 	/**

   107 	Creates an CRC2DecryptorShim object which has the same interface

   108 	as RC2 Decryptor but delegates all work to a Crypto SPI plug-in.

   109 	

   110 	A pointer to the new object is placed on the cleanup stack

   111 	

   112 	@param aKey The decryption key

   113 	@return A pointer to a CRC2DecryptorShim instance

   114 	*/

   115 	static CRC2DecryptorShim* NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits);

   116 	

   117 	// From CBlockTransform

   118 	TInt BlockSize() const;

   119 	void Transform(TDes8& aBlock);

   120 	void Reset(void);

   121 	TInt KeySize(void) const;

   122 	

   123 	/// Destructor

   124 	~CRC2DecryptorShim();

   125 	

   126 private:

   127 	/// Constructor	

   128 	CRC2DecryptorShim();	

   129 	void ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);	

   130 	

   131 	/**

   132 	From CBase, to allow CBufferedTransform & CBlockChainingMode

   133 	to determine whether the functionality may be delegated to

   134 	the SPI object.

   135 	*/ 

   136 	TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);

   137 	

   138 private:	

   139 	/// SPI delegate

   140 	CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;

   141 		

   142 	/// SPI requires all key to passed as key-objects

   143 	CryptoSpi::CKey* iKey;		

   144 	

   145 	/// Temporary output block, SPI does not overwrite input

   146 	/// RC2 uses 64bit blocks

   147 	TBuf8<16> iOutputBlock;

   148 	

   149 	/// The effective key length is passed as an algorithm

   150 	/// parameter. This allows it to be externalised.

   151 	CryptoSpi::CCryptoParams* iAlgorithmParams;

   152 };

   153 

   154 #endif // __RC2SHIM_H__
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