cryptomgmtlibs/securityutils/inc/base64.h
author Santosh Patil <santosh.v.patil@nokia.com>
Wed, 08 Jul 2009 11:25:26 +0100
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child 6 50f2ff6984be
permissions -rw-r--r--
Move the Security package to EPL, and add the implementations of the cryptographic algorithms
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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//
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// base64.h
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//
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/**
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* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Symbian Foundation License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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* Base64 encoding and decoding functions.
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* 
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*
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*/
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/**
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 @file
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 @internalComponent
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*/
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#ifndef __BASE64_H__
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#define __BASE64_H__
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#include <e32base.h>
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/**
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 * This class performs Base64 encoding and decoding. The implementation
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 * has been obtained from messaging.
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 */
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class TBase64
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	{
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public:
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	/**
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	 * Constructs the codec object.
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	 */
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	IMPORT_C TBase64();
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	/**
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	 * Initializes the codec.
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	 */
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	IMPORT_C void Initialize();
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	/**
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	 * Encodes binary data using base64 encoding.
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	 * @param aSrcString Data to encode.
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	 * @return Newly allocated buffer containing base64 encoding of
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	 *     the data (on the cleanup stack).
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	 * @note The function leaves in case of an error.
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	 */
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	IMPORT_C HBufC8* EncodeLC(const TDesC8& aSrcString);
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	/**
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	 * Decodes base64-encoded binary data.
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	 * @param aSrcString Data to decode.
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	 * @param aNeedMoreData Receives ETrue if the encoded string is
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	 *     not long enough to decode in full, EFalse otherwise.
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	 * @return Newly allocated buffer containing decoded binary data
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	 *     (on the cleanup stack).
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	 * @note The function leaves in case of an error.
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	 */
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	IMPORT_C HBufC8* DecodeLC(const TDesC8& aSrcString, TBool& aNeedMoreData);
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private:
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	enum {EPadChar = 64};
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	enum EMaskValues {ESixBitMask = 0x3F, EEightBitMask = 0xFF};
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	enum EMaskShiftValues {ESix = 6, EFour = 4, ETwo = 2, EZero = 0};
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	static const TUint8 iAlphabet[];
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	TInt iShiftStored;
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	TInt iMaskShiftStored;
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	};
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#endif // __BASE64_H__