#ifndef __CRYPTO_SHACOMMON_H_+
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#define __CRYPTO_SHACOMMON_H_+
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+
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#include <e32base.h>/*+
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* Copyright (c) 2007-2009 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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* Same as used in SHA1+
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* SHA_CH		> CSHA1_F+
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* SHA_Maj		> CSHA1_H+
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* SHA_Parity	> CSHA1_G+
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* The following definitions are equivalent and potentially faster.+
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* #define SHA_Ch(x, y, z)      (((x) & ((y) ^ (z))) ^ (z))+
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* #define SHA_Maj(x, y, z)     (((x) & ((y) | (z))) | ((y) & (z)))+
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* These functions are defined in FIPS 180-2 Section 4.1+
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* Equation 4.1, 4.2, 4.3, 4.8, 4.9+
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*+
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*/+
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+
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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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 @released+
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*/+
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template<typename T>+
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inline T SHA_Ch(T aX, T aY, T aZ)+
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	{+
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	return ((aX & aY) ^ ((~aX) & aZ));+
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	}+
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+
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template<typename T>+
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inline T SHA_Maj(T aX, T aY, T aZ)+
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	{+
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	return ((aX & aY) ^ (aX & aZ) ^ (aY & aZ));+
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	}+
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+
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template<typename T>+
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inline T SHA_Parity(T aX, T aY, T aZ)+
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	{+
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	return (aX ^ aY ^ aZ);+
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	}+
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+
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/**+
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 * Define the SHA shift, and rotate right macro +
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 * Defined in FIPS 180-2 Section 3.2+
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 */+
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/** +
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 * SHA Right Shift operation: The right shift operation SHR^n(x), +
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 * where x is a w-bit word and n is an integer with 0 <= n < w, +
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 * is defined by  SHR^n(x) = x >> n.+
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 */+
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template<typename T>+
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inline T SHA_SHR(T aBits, T aWord)+
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	{+
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	return (aWord >> aBits);+
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	}+
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+
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/**+
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 * SHA Rotate Right Operation: The rotate right (circular right shift) operation+
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 * ROTR^n(x), where x is a w-bit word and n is an integer with 0 <= n < w, +
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 * is defined by ROTR n(x)=(x >> n) || (x << w - n).+
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 */+
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template<typename T>+
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inline T SHA_ROTR(T aBits, T aWord)+
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	{+
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	TInt totalBits = sizeof(T) << 3;+
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	return ((aWord >> aBits) | (aWord << (totalBits-aBits)));+
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	}+
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+
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NONSHARABLE_CLASS(MSHA2Impl)+
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	{+
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public:+
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	/**+
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	 * This function will reset the state of hash.+
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	 */+
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	virtual void Reset(const TAny*) = 0;+
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	/**+
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	 * This function will finalize the hash and return+
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	 * the calculated hash.+
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	 * @return Final hash+
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	 */ +
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	virtual const TDesC8& Final() = 0;+
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	/**+
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	 * This function will add the message to the internal+
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	 * buffer and if the block size is reached then calcualte+
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	 * the hash till that point.+
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	 * @param aMessage Message to be updated.+
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	 * @param aLength Length of the message to be updated.+
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	 */ +
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	virtual void Update(const TUint8* aMessage, TUint aLength) = 0;+
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	/**+
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	 * This function will save the internal state of the hash.+
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	 */ +
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	virtual void StoreState() = 0;+
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	/**+
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	 * This function will retrieve the saved the internal state +
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	 * of the hash.+
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	 */ +
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	virtual void RestoreState() = 0;+
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	/**+
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	 * virtual distructor.+
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	 */+
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	virtual ~MSHA2Impl(){}+
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	};+
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+
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#endif //__CRYPTO_SHACOMMON_H_+
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