os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/sha224and256impl.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution.
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/*
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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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* Common implementation of SHA224 and SHA256
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* RFC 4634 (US Secure Hash Algorithms (SHA and HMAC-SHA))
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*
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*/
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/**
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 @file
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*/
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#include <cryptospi/hashplugin.h>
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#include "pluginconfig.h"
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#include "sha224and256impl.h"
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using namespace SoftwareCrypto;
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/**
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 * SHA256 Constants
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 * 
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 * SHA-256 uses a sequence of sixty-four constant 32-bit words. 
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 * These words represent the first thirty-two bits of the fractional 
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 * parts of the cube roots of the first sixtyfour prime numbers.
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 * 
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 * FIPS 180-2 Section 4.2.2
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 */
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const TUint K[64] = 
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	{
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	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,	
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	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 
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	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 
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	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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	};
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/**
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 * Define the SHA SIGMA and sigma macros 
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 * 
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 * FIPS 180-2 section 4.1.2
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 */
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// Equation 4.4
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inline TUint SHA256_SIGMA0(TUint aWord)
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	{
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	return (SHA_ROTR<TUint>( 2,aWord) ^ SHA_ROTR<TUint>(13,aWord) ^ SHA_ROTR<TUint>(22,aWord));
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	}
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// Equation 4.5
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inline TUint SHA256_SIGMA1(TUint aWord)
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	{
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	return (SHA_ROTR<TUint>( 6,aWord) ^ SHA_ROTR<TUint>(11,aWord) ^ SHA_ROTR<TUint>(25,aWord));
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	}
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// Equation 4.6
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inline TUint SHA256_sigma0(TUint aWord)
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	{
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	return (SHA_ROTR<TUint>( 7,aWord) ^ SHA_ROTR<TUint>(18,aWord) ^ SHA_SHR<TUint>( 3,aWord));
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	}
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// Equation 4.7
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inline TUint SHA256_sigma1(TUint aWord)
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	{
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	return (SHA_ROTR<TUint>(17,aWord) ^ SHA_ROTR<TUint>(19,aWord) ^ SHA_SHR<TUint>(10,aWord));
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	}
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// Macros
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inline TUint MakeWord(const TUint8* aData)
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	{
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	return (aData[0] << 24 | aData[1] << 16 | aData[2] << 8 | aData[3]);
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	}
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CSHA224And256Impl* CSHA224And256Impl::NewL()
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	{
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	CSHA224And256Impl* self=new (ELeave) CSHA224And256Impl();
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	return self;						
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	}
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CSHA224And256Impl::CSHA224And256Impl() : iHash(KSHA256HashSize)
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	{		
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	}
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CSHA224And256Impl::CSHA224And256Impl(const CSHA224And256Impl& aSHA256Impl)
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				: 	iHash(aSHA256Impl.iHash),
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					iA(aSHA256Impl.iA),
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					iB(aSHA256Impl.iB),
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					iC(aSHA256Impl.iC),
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					iD(aSHA256Impl.iD),
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					iE(aSHA256Impl.iE),
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					iF(aSHA256Impl.iF),
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					iG(aSHA256Impl.iG),
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					iH(aSHA256Impl.iH),
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					iNl(aSHA256Impl.iNl),
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					iNh(aSHA256Impl.iNh)
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	{
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	Mem::Copy(iData, aSHA256Impl.iData, KSHA256BlockSize*sizeof(TUint));
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	}
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void CSHA224And256Impl::Reset(const TAny* aValArray)
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	{
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	const TUint* values = static_cast<const TUint*>(aValArray);
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	/**
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	 * Initial Hash Value
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	 * 
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	 * These words were obtained by taking the first thirty-two bits 
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	 * of the fractional parts of the square roots of the first eight
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	 * prime numbers.
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	 * 
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	 * FIPS 180-2 Section 5.3.2
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	 */
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	iA=values[0];
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	iB=values[1];
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	iC=values[2];
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	iD=values[3];
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	iE=values[4];
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	iF=values[5];
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	iG=values[6];
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	iH=values[7];
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	iNh=0;
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	iNl=0;
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	}
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// This assumes a big-endian architecture
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void CSHA224And256Impl::Update(const TUint8* aData,TUint aLength)
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	{
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	while((aLength / 4) > 0 && (iNl % 4 == 0))
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		{
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		iData[iNl>>2] = MakeWord(aData);
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		iNl+=4;
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		aData+=4;
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		aLength-=4;
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		if(iNl==KSHA256BlockSize) 
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			{
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			Block();
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			AddLength(KSHA256BlockSize);
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			}
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		}
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	while(aLength--)
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		{
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		if(!(iNl&0x03))
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			{
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			iData[iNl >> 2] = 0;
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			}
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		iData[iNl >> 2] |= *aData << ((3 - iNl&0x03) << 3) ;
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		++aData;
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		++iNl;
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		if(iNl==KSHA256BlockSize) 
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			{
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			Block();
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			AddLength(KSHA256BlockSize);
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			}
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		}
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	}
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//This function will panic if the total input length is longer than 2^64 in bits
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_LIT(KPanicString, "Message length exceeds supported length");
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inline void CSHA224And256Impl::AddLength(const TUint aLength)
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	{
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	TUint64 temp = iNh;
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	iNh += aLength << 3;
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	__ASSERT_ALWAYS((temp <= iNh), User::Panic(KPanicString, KErrOverflow));
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	}
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static inline void CSHA256_16(	const TUint aA, 
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								const TUint aB, 
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								const TUint aC,
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								TUint& aD, 
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								const TUint aE, 
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								const TUint aF,
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								const TUint aG, 
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								TUint& aH,
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								TUint aTemp1,
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								TUint aTemp2,
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								const TUint aK,
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								const TUint aWord)
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	{
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	aTemp1 = aH + SHA256_SIGMA1(aE) + SHA_Ch(aE,aF,aG) + aK + aWord;
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	aTemp2 = SHA256_SIGMA0(aA) + SHA_Maj(aA,aB,aC);
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	aD = aD + aTemp1;
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	aH = aTemp1 + aTemp2;
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	}
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static inline void CSHA256_48(	const TUint aA, 
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								const TUint aB, 
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								const TUint aC,
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								TUint& aD, 
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								const TUint aE, 
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								const TUint aF,
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								const TUint aG, 
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								TUint& aH,
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								TUint aTemp1,
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								TUint aTemp2,
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								const TUint aK,
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								TUint& aWord0,
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								const TUint aWord2,
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								const TUint aWord7,
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								const TUint aWord15,
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								const TUint aWord16)
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	{
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	aWord0 = SHA256_sigma1(aWord2) + aWord7 + SHA256_sigma0(aWord15) + aWord16;
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	CSHA256_16(aA, aB, aC, aD, aE, aF, aG, aH, aTemp1, aTemp2, aK, aWord0);
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	}
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/**
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 * This function actually calculates the hash.
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 * Function is defined in FIPS 180-2 section 6.2.2
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 * 
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 * This function is the expanded version of the following loop.
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 *	for(TUint i = 0; i < 64; ++i)
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 *		{
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 *		if(i >= 16)
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 *			{
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 * 			iData[i] = SHA256_sigma1(iData[i-2]) + iData[i-7] + SHA256_sigma0(iData[i-15]) + iData[i-16];
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 *			}
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 *
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 *		temp1 = tempH + SHA256_SIGMA1(tempE) + SHA_Ch(tempE,tempF,tempG) + K[i] + iData[i];
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 *		temp2 = SHA256_SIGMA0(tempA) + SHA_Maj(tempA,tempB,tempC);
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 *	    tempH = tempG;
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 *	    tempG = tempF;
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 *	    tempF = tempE;
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 *	    tempE = tempD + temp1;
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 *	    tempD = tempC;
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 *	    tempC = tempB;
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 *	    tempB = tempA;
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 *	    tempA = temp1 + temp2;		
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 *		}
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 */
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void CSHA224And256Impl::Block()
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	{
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	TUint tempA=iA;
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	TUint tempB=iB;
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	TUint tempC=iC;
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	TUint tempD=iD;
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	TUint tempE=iE;
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	TUint tempF=iF;
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	TUint tempG=iG;
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	TUint tempH=iH;
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	TUint temp1=0;
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	TUint temp2=0;
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	CSHA256_16(tempA,tempB,tempC,tempD,tempE,tempF,tempG,tempH,temp1,temp2,K[0],iData[0]);
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	CSHA256_16(tempH,tempA,tempB,tempC,tempD,tempE,tempF,tempG,temp1,temp2,K[1],iData[1]);
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	CSHA256_16(tempG,tempH,tempA,tempB,tempC,tempD,tempE,tempF,temp1,temp2,K[2],iData[2]);
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	CSHA256_16(tempF,tempG,tempH,tempA,tempB,tempC,tempD,tempE,temp1,temp2,K[3],iData[3]);
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	CSHA256_16(tempE,tempF,tempG,tempH,tempA,tempB,tempC,tempD,temp1,temp2,K[4],iData[4]);
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	CSHA256_16(tempD,tempE,tempF,tempG,tempH,tempA,tempB,tempC,temp1,temp2,K[5],iData[5]);
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	CSHA256_16(tempC,tempD,tempE,tempF,tempG,tempH,tempA,tempB,temp1,temp2,K[6],iData[6]);
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	CSHA256_16(tempB,tempC,tempD,tempE,tempF,tempG,tempH,tempA,temp1,temp2,K[7],iData[7]);
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	CSHA256_16(tempA,tempB,tempC,tempD,tempE,tempF,tempG,tempH,temp1,temp2,K[8],iData[8]);
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	CSHA256_16(tempH,tempA,tempB,tempC,tempD,tempE,tempF,tempG,temp1,temp2,K[9],iData[9]);
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	CSHA256_16(tempG,tempH,tempA,tempB,tempC,tempD,tempE,tempF,temp1,temp2,K[10],iData[10]);
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	CSHA256_16(tempF,tempG,tempH,tempA,tempB,tempC,tempD,tempE,temp1,temp2,K[11],iData[11]);
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	CSHA256_16(tempE,tempF,tempG,tempH,tempA,tempB,tempC,tempD,temp1,temp2,K[12],iData[12]);
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	CSHA256_16(tempD,tempE,tempF,tempG,tempH,tempA,tempB,tempC,temp1,temp2,K[13],iData[13]);
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	CSHA256_16(tempC,tempD,tempE,tempF,tempG,tempH,tempA,tempB,temp1,temp2,K[14],iData[14]);
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	CSHA256_16(tempB,tempC,tempD,tempE,tempF,tempG,tempH,tempA,temp1,temp2,K[15],iData[15]);
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	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,
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				K[16], iData[16], iData[14], iData[9], iData[1], iData[0]);
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	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,
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				K[17], iData[17], iData[15], iData[10], iData[2], iData[1]);
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	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,
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				K[18], iData[18], iData[16], iData[11], iData[3], iData[2]);
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	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,
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				K[19], iData[19], iData[17], iData[12], iData[4], iData[3]);
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	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,
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				K[20], iData[20], iData[18], iData[13], iData[5], iData[4]);
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	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,
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				K[21], iData[21], iData[19], iData[14], iData[6], iData[5]);
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	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,
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				K[22], iData[22], iData[20], iData[15], iData[7], iData[6]);
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	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,
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				K[23], iData[23], iData[21], iData[16], iData[8], iData[7]);
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	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,
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				K[24], iData[24], iData[22], iData[17], iData[9], iData[8]);
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	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,
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				K[25], iData[25], iData[23], iData[18], iData[10], iData[9]);
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	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,
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				K[26], iData[26], iData[24], iData[19], iData[11], iData[10]);
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	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,
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				K[27], iData[27], iData[25], iData[20], iData[12], iData[11]);
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	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,
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				K[28], iData[28], iData[26], iData[21], iData[13], iData[12]);
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	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,
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				K[29], iData[29], iData[27], iData[22], iData[14], iData[13]);
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	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,
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				K[30], iData[30], iData[28], iData[23], iData[15], iData[14]);
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	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,
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				K[31], iData[31], iData[29], iData[24], iData[16], iData[15]);
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	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,
sl@0
   318
				K[32], iData[32], iData[30], iData[25], iData[17], iData[16]);
sl@0
   319
	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,
sl@0
   320
				K[33], iData[33], iData[31], iData[26], iData[18], iData[17]);
sl@0
   321
	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,
sl@0
   322
				K[34], iData[34], iData[32], iData[27], iData[19], iData[18]);
sl@0
   323
	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,
sl@0
   324
				K[35], iData[35], iData[33], iData[28], iData[20], iData[19]);
sl@0
   325
	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,
sl@0
   326
				K[36], iData[36], iData[34], iData[29], iData[21], iData[20]);
sl@0
   327
	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,
sl@0
   328
				K[37], iData[37], iData[35], iData[30], iData[22], iData[21]);
sl@0
   329
	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,
sl@0
   330
				K[38], iData[38], iData[36], iData[31], iData[23], iData[22]);
sl@0
   331
	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,
sl@0
   332
				K[39], iData[39], iData[37], iData[32], iData[24], iData[23]);
sl@0
   333
sl@0
   334
	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,
sl@0
   335
				K[40], iData[40], iData[38], iData[33], iData[25], iData[24]);
sl@0
   336
	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,
sl@0
   337
				K[41], iData[41], iData[39], iData[34], iData[26], iData[25]);
sl@0
   338
	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,
sl@0
   339
				K[42], iData[42], iData[40], iData[35], iData[27], iData[26]);
sl@0
   340
	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,
sl@0
   341
				K[43], iData[43], iData[41], iData[36], iData[28], iData[27]);
sl@0
   342
	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,
sl@0
   343
				K[44], iData[44], iData[42], iData[37], iData[29], iData[28]);
sl@0
   344
	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,
sl@0
   345
				K[45], iData[45], iData[43], iData[38], iData[30], iData[29]);
sl@0
   346
	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,
sl@0
   347
				K[46], iData[46], iData[44], iData[39], iData[31], iData[30]);
sl@0
   348
	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,
sl@0
   349
				K[47], iData[47], iData[45], iData[40], iData[32], iData[31]);
sl@0
   350
sl@0
   351
	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,
sl@0
   352
				K[48], iData[48], iData[46], iData[41], iData[33], iData[32]);
sl@0
   353
	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,
sl@0
   354
				K[49], iData[49], iData[47], iData[42], iData[34], iData[33]);
sl@0
   355
	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,
sl@0
   356
				K[50], iData[50], iData[48], iData[43], iData[35], iData[34]);
sl@0
   357
	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,
sl@0
   358
				K[51], iData[51], iData[49], iData[44], iData[36], iData[35]);
sl@0
   359
	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,
sl@0
   360
				K[52], iData[52], iData[50], iData[45], iData[37], iData[36]);
sl@0
   361
	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,
sl@0
   362
				K[53], iData[53], iData[51], iData[46], iData[38], iData[37]);
sl@0
   363
	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,
sl@0
   364
				K[54], iData[54], iData[52], iData[47], iData[39], iData[38]);
sl@0
   365
	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,
sl@0
   366
				K[55], iData[55], iData[53], iData[48], iData[40], iData[39]);
sl@0
   367
sl@0
   368
	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,
sl@0
   369
				K[56], iData[56], iData[54], iData[49], iData[41], iData[40]);
sl@0
   370
	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,
sl@0
   371
				K[57], iData[57], iData[55], iData[50], iData[42], iData[41]);
sl@0
   372
	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,
sl@0
   373
				K[58], iData[58], iData[56], iData[51], iData[43], iData[42]);
sl@0
   374
	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,
sl@0
   375
				K[59], iData[59], iData[57], iData[52], iData[44], iData[43]);
sl@0
   376
	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,
sl@0
   377
				K[60], iData[60], iData[58], iData[53], iData[45], iData[44]);
sl@0
   378
	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,
sl@0
   379
				K[61], iData[61], iData[59], iData[54], iData[46], iData[45]);
sl@0
   380
	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,
sl@0
   381
				K[62], iData[62], iData[60], iData[55], iData[47], iData[46]);
sl@0
   382
	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,
sl@0
   383
				K[63], iData[63], iData[61], iData[56], iData[48], iData[47]);
sl@0
   384
sl@0
   385
	iA+=tempA;
sl@0
   386
	iB+=tempB;
sl@0
   387
	iC+=tempC;
sl@0
   388
	iD+=tempD;
sl@0
   389
	iE+=tempE;
sl@0
   390
	iF+=tempF;
sl@0
   391
	iG+=tempG;
sl@0
   392
	iH+=tempH;
sl@0
   393
sl@0
   394
	iNl=0;
sl@0
   395
	}
sl@0
   396
sl@0
   397
/**
sl@0
   398
 * According to the standard, the message must be padded to an
sl@0
   399
 * even 512 bits. The first padding bit must be a '1'. The last
sl@0
   400
 * 64 bits represent the length of the original message. All bits 
sl@0
   401
 * in between should be 0. This helper function will pad the 
sl@0
   402
 * message according to those rules by filling the iData array 
sl@0
   403
 * accordingly. 
sl@0
   404
 */ 
sl@0
   405
void CSHA224And256Impl::PadMessage()
sl@0
   406
	{
sl@0
   407
	const TUint padByte = 0x80;
sl@0
   408
	
sl@0
   409
	if(!(iNl&0x03))
sl@0
   410
		{
sl@0
   411
		iData[iNl >> 2] = 0;
sl@0
   412
		}
sl@0
   413
	iData[iNl >> 2] |= padByte << ((3 - iNl&0x03) << 3) ;
sl@0
   414
sl@0
   415
	if (iNl >= (KSHA256BlockSize - 2*sizeof(TUint))) 
sl@0
   416
		{
sl@0
   417
		if (iNl < (KSHA256BlockSize - sizeof(TUint)))
sl@0
   418
			iData[(KSHA256BlockSize >> 2) - 1]=0;		
sl@0
   419
		Block();
sl@0
   420
		Mem::FillZ(iData, KSHA256BlockSize);
sl@0
   421
		} 
sl@0
   422
	else
sl@0
   423
		{
sl@0
   424
		const TUint offset=(iNl+4)>>2; //+4 to account for the word added in the
sl@0
   425
		//switch statement above
sl@0
   426
		Mem::FillZ(iData+offset,(KSHA256BlockSize - offset*sizeof(TUint)));
sl@0
   427
		}
sl@0
   428
sl@0
   429
	//Length in bits
sl@0
   430
	TUint64 msgLength = iNh;
sl@0
   431
sl@0
   432
	iData[(KSHA256BlockSize >> 2) - 2] = (msgLength) >> 32;
sl@0
   433
	iData[(KSHA256BlockSize >> 2) - 1] = (msgLength & 0xFFFFFFFF);	
sl@0
   434
	}
sl@0
   435
sl@0
   436
inline void CSHA224And256Impl::CopyWordToHash(TUint aVal, TUint aIndex)
sl@0
   437
	{
sl@0
   438
	TUint value = MakeWord(reinterpret_cast<TUint8*>(&aVal));
sl@0
   439
	Mem::Copy(const_cast<TUint8*>(iHash.Ptr())+ (4*aIndex), &value, sizeof(aVal));
sl@0
   440
	}
sl@0
   441
sl@0
   442
const TDes8& CSHA224And256Impl::Final()
sl@0
   443
	{
sl@0
   444
	AddLength(iNl);
sl@0
   445
	PadMessage();
sl@0
   446
	Block();
sl@0
   447
	//
sl@0
   448
	// Generate hash value into iHash
sl@0
   449
	//
sl@0
   450
	CopyWordToHash(iA, 0);
sl@0
   451
	CopyWordToHash(iB, 1);
sl@0
   452
	CopyWordToHash(iC, 2);
sl@0
   453
	CopyWordToHash(iD, 3);
sl@0
   454
	CopyWordToHash(iE, 4);
sl@0
   455
	CopyWordToHash(iF, 5);
sl@0
   456
	CopyWordToHash(iG, 6);
sl@0
   457
	CopyWordToHash(iH, 7);
sl@0
   458
	
sl@0
   459
	return iHash;
sl@0
   460
	}
sl@0
   461
sl@0
   462
void CSHA224And256Impl::RestoreState()
sl@0
   463
	{
sl@0
   464
	iA = iACopy;
sl@0
   465
	iB = iBCopy;
sl@0
   466
	iC = iCCopy;
sl@0
   467
	iD = iDCopy;
sl@0
   468
	iE = iECopy;
sl@0
   469
	iF = iFCopy;
sl@0
   470
	iG = iGCopy;
sl@0
   471
	iH = iHCopy;
sl@0
   472
	iNl = iNlCopy;
sl@0
   473
	iNh = iNhCopy;	
sl@0
   474
	Mem::Copy(iData, iDataCopy, KSHA256BlockSize*sizeof(TUint)); 
sl@0
   475
	}
sl@0
   476
sl@0
   477
void CSHA224And256Impl::StoreState()
sl@0
   478
	{
sl@0
   479
	iACopy = iA;
sl@0
   480
	iBCopy = iB;
sl@0
   481
	iCCopy = iC;
sl@0
   482
	iDCopy = iD;
sl@0
   483
	iECopy = iE;
sl@0
   484
	iFCopy = iF;
sl@0
   485
	iGCopy = iG;
sl@0
   486
	iHCopy = iH;
sl@0
   487
	iNlCopy = iNl;
sl@0
   488
	iNhCopy = iNh;	
sl@0
   489
	Mem::Copy(iDataCopy, iData, KSHA256BlockSize*sizeof(TUint));
sl@0
   490
	}
sl@0
   491
sl@0
   492
// Implemented in hmacimpl.cpp or softwarehashbase.cpp
sl@0
   493
// but required as derived from MHash. No coverage here.
sl@0
   494
#ifdef _BullseyeCoverage
sl@0
   495
#pragma suppress_warnings on
sl@0
   496
#pragma BullseyeCoverage off
sl@0
   497
#pragma suppress_warnings off
sl@0
   498
#endif
sl@0
   499