1 /*

     2 * Copyright (c) 2003-2009 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 * ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the 

    16 * Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.

    17 *

    18 */

    19 

    20 

    21 /**

    22  @file

    23  @publishedPartner

    24  @released

    25 */

    26 

    27 #ifndef __CRYPTOSTRENGTH_H__

    28 #define __CRYPTOSTRENGTH_H__

    29 

    30 /**

    31  * Some builds of the crypto library have restrictions that only allow weak

    32  * ciphers to be used.  This class provides static helper functions for

    33  * determining these restrictions.

    34  */

    35 class TCrypto

    36 	{

    37 public:

    38 	/**

    39 	 * Defines the strength of the cipher. 

    40 	 */

    41 	enum TStrength 

    42 		{ 

    43 		EWeak, EStrong

    44 		};

    45 public:

    46 	/**

    47 	 * Gets the allowed cipher strength.

    48 	 *

    49 	 * @return The allowed cipher strength.	

    50 	 */	

    51 	static IMPORT_C TCrypto::TStrength Strength();

    52 

    53 	/**

    54 	 * Indicates whether a symmetric key is small enough to be allowed. Note

    55 	 * that this function leaves if the key is too large - in other words it can

    56 	 * never return EFalse.

    57 	 * 

    58 	 * @param aSymmetricKeyBits	    The size (in bits) of the symmetric key

    59 	 * @return						Whether the key is small enough to be allowed

    60 	 * 

    61 	 * @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the

    62 	 *								cipher strength restrictions of the crypto library.

    63 	 */

    64 	static IMPORT_C TBool IsSymmetricWeakEnoughL(TInt aSymmetricKeyBits);

    65 

    66 	/**

    67 	 * Indicates whether an asymmetric key is small enough to be allowed.  Note

    68 	 * that this function leaves if the key is too large - in other words it can

    69 	 * never return EFalse.

    70 	 *

    71 	 * @param aAsymmetricKeyBits	The size (in bits) of the asymmetric key

    72 	 * @return						Whether the key is small enough to be allowed

    73 	 * 

    74 	 * @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the

    75 	 *								cipher strength restrictions of the crypto library.

    76 	 */

    77 	static IMPORT_C TBool IsAsymmetricWeakEnoughL(TInt aAsymmetricKeyBits);

    78 	};

    79 

    80 #endif //__CRYPTOSTRENGTH_H__