sl@0: /*
sl@0: * Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: * ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the 
sl@0: * Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: /**
sl@0:  @file
sl@0:  @publishedPartner
sl@0:  @released
sl@0: */
sl@0: 
sl@0: #ifndef __CRYPTOSTRENGTH_H__
sl@0: #define __CRYPTOSTRENGTH_H__
sl@0: 
sl@0: /**
sl@0:  * Some builds of the crypto library have restrictions that only allow weak
sl@0:  * ciphers to be used.  This class provides static helper functions for
sl@0:  * determining these restrictions.
sl@0:  */
sl@0: class TCrypto
sl@0: 	{
sl@0: public:
sl@0: 	/**
sl@0: 	 * Defines the strength of the cipher. 
sl@0: 	 */
sl@0: 	enum TStrength 
sl@0: 		{ 
sl@0: 		EWeak, EStrong
sl@0: 		};
sl@0: public:
sl@0: 	/**
sl@0: 	 * Gets the allowed cipher strength.
sl@0: 	 *
sl@0: 	 * @return The allowed cipher strength.	
sl@0: 	 */	
sl@0: 	static IMPORT_C TCrypto::TStrength Strength();
sl@0: 
sl@0: 	/**
sl@0: 	 * Indicates whether a symmetric key is small enough to be allowed. Note
sl@0: 	 * that this function leaves if the key is too large - in other words it can
sl@0: 	 * never return EFalse.
sl@0: 	 * 
sl@0: 	 * @param aSymmetricKeyBits	    The size (in bits) of the symmetric key
sl@0: 	 * @return						Whether the key is small enough to be allowed
sl@0: 	 * 
sl@0: 	 * @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the
sl@0: 	 *								cipher strength restrictions of the crypto library.
sl@0: 	 */
sl@0: 	static IMPORT_C TBool IsSymmetricWeakEnoughL(TInt aSymmetricKeyBits);
sl@0: 
sl@0: 	/**
sl@0: 	 * Indicates whether an asymmetric key is small enough to be allowed.  Note
sl@0: 	 * that this function leaves if the key is too large - in other words it can
sl@0: 	 * never return EFalse.
sl@0: 	 *
sl@0: 	 * @param aAsymmetricKeyBits	The size (in bits) of the asymmetric key
sl@0: 	 * @return						Whether the key is small enough to be allowed
sl@0: 	 * 
sl@0: 	 * @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the
sl@0: 	 *								cipher strength restrictions of the crypto library.
sl@0: 	 */
sl@0: 	static IMPORT_C TBool IsAsymmetricWeakEnoughL(TInt aAsymmetricKeyBits);
sl@0: 	};
sl@0: 
sl@0: #endif //__CRYPTOSTRENGTH_H__