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#ifndef __CRYPTO_SHACOMMON_H_
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#define __CRYPTO_SHACOMMON_H_
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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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@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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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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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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* 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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* 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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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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#endif //__CRYPTO_SHACOMMON_H_
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