1 /*

     2 * Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 * Common implementation of SHA224 and SHA256

    16 * RFC 4634 (US Secure Hash Algorithms (SHA and HMAC-SHA))

    17 *

    18 */

    19 

    20 

    21 

    22 

    23 /**

    24  @file

    25 */

    26 

    27 

    28 #include "sha224and256.h"

    29 

    30 /**

    31  * SHA256 Constants

    32  * 

    33  * SHA-256 uses a sequence of sixty-four constant 32-bit words. 

    34  * These words represent the first thirty-two bits of the fractional 

    35  * parts of the cube roots of the first sixtyfour prime numbers.

    36  * 

    37  * FIPS 180-2 Section 4.2.2

    38  */

    39 const TUint K[64] = 

    40 	{

    41 	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,	

    42 	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,

    43 	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,

    44 	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,

    45 	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,

    46 	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,

    47 	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,

    48 	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,

    49 	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,

    50 	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,

    51 	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 

    52 	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,

    53 	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 

    54 	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,

    55 	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,

    56 	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2

    57 	};

    58 

    59 /**

    60  * Define the SHA SIGMA and sigma macros 

    61  * 

    62  * FIPS 180-2 section 4.1.2

    63  */

    64 // Equation 4.4

    65 inline TUint SHA256_SIGMA0(TUint aWord)

    66 	{

    67 	return (SHA_ROTR<TUint>( 2,aWord) ^ SHA_ROTR<TUint>(13,aWord) ^ SHA_ROTR<TUint>(22,aWord));

    68 	}

    69 // Equation 4.5

    70 inline TUint SHA256_SIGMA1(TUint aWord)

    71 	{

    72 	return (SHA_ROTR<TUint>( 6,aWord) ^ SHA_ROTR<TUint>(11,aWord) ^ SHA_ROTR<TUint>(25,aWord));

    73 	}

    74 // Equation 4.6

    75 inline TUint SHA256_sigma0(TUint aWord)

    76 	{

    77 	return (SHA_ROTR<TUint>( 7,aWord) ^ SHA_ROTR<TUint>(18,aWord) ^ SHA_SHR<TUint>( 3,aWord));

    78 	}

    79 // Equation 4.7

    80 inline TUint SHA256_sigma1(TUint aWord)

    81 	{

    82 	return (SHA_ROTR<TUint>(17,aWord) ^ SHA_ROTR<TUint>(19,aWord) ^ SHA_SHR<TUint>(10,aWord));

    83 	}

    84 

    85 

    86 // Macros

    87 inline TUint MakeWord(const TUint8* aData)

    88 	{

    89 	return (aData[0] << 24 | aData[1] << 16 | aData[2] << 8 | aData[3]);

    90 	}

    91 

    92 	

    93 CSHA224And256* CSHA224And256::NewL()

    94 	{

    95 	CSHA224And256* self=new (ELeave) CSHA224And256();

    96 	return self;						

    97 	}

    98 														

    99 CSHA224And256::CSHA224And256() : iHash(KSHA256HashSize)

   100 	{		

   101 	}

   102 	

   103 CSHA224And256::CSHA224And256(const CSHA224And256& aSHAImpl)

   104 				: 	iHash(aSHAImpl.iHash),

   105 					iA(aSHAImpl.iA),

   106 					iB(aSHAImpl.iB),

   107 					iC(aSHAImpl.iC),

   108 					iD(aSHAImpl.iD),

   109 					iE(aSHAImpl.iE),

   110 					iF(aSHAImpl.iF),

   111 					iG(aSHAImpl.iG),

   112 					iH(aSHAImpl.iH),

   113 					iNl(aSHAImpl.iNl),

   114 					iNh(aSHAImpl.iNh)

   115 	{

   116 	Mem::Copy(iData, aSHAImpl.iData, KSHA256BlockSize*sizeof(TUint));

   117 	}

   118 	

   119 void CSHA224And256::Reset(const TAny* aValArray)

   120 	{

   121 	const TUint* values = static_cast<const TUint*>(aValArray);

   122 	iA=values[0];

   123 	iB=values[1];

   124 	iC=values[2];

   125 	iD=values[3];

   126 	iE=values[4];

   127 	iF=values[5];

   128 	iG=values[6];

   129 	iH=values[7];

   130 	iNh=0;

   131 	iNl=0;

   132 	}

   133 

   134 // This assumes a big-endian architecture

   135 void CSHA224And256::Update(const TUint8* aData,TUint aLength)

   136 	{

   137 	while((aLength / 4) > 0 && (iNl % 4 == 0))

   138 		{

   139 		iData[iNl>>2] = MakeWord(aData);

   140 		iNl+=4;

   141 		aData+=4;

   142 		aLength-=4;

   143 		if(iNl==KSHA256BlockSize) 

   144 			{

   145 			Block();

   146 			AddLength(KSHA256BlockSize);

   147 			}

   148 		}

   149 

   150 	while(aLength--)

   151 		{

   152 		if(!(iNl&0x03))

   153 			{

   154 			iData[iNl >> 2] = 0;

   155 			}

   156 		iData[iNl >> 2] |= *aData << ((3 - iNl&0x03) << 3) ;

   157 		++aData;

   158 		++iNl;

   159 		if(iNl==KSHA256BlockSize) 

   160 			{

   161 			Block();

   162 			AddLength(KSHA256BlockSize);

   163 			}

   164 		}

   165 	}

   166 

   167 //This function will panic if the total input length is longer than 2^64 in bits

   168 _LIT(KPanicString, "Message length exceeds supported length");

   169 inline void CSHA224And256::AddLength(const TUint aLength)

   170 	{

   171 	TUint64 temp = iNh;

   172 	iNh += aLength << 3;

   173 	__ASSERT_ALWAYS((temp <= iNh), User::Panic(KPanicString, KErrOverflow));

   174 	}

   175 

   176 

   177 static inline void CSHA256_16(	const TUint aA, 

   178 								const TUint aB, 

   179 								const TUint aC,

   180 								TUint& aD, 

   181 								const TUint aE, 

   182 								const TUint aF,

   183 								const TUint aG, 

   184 								TUint& aH,

   185 								TUint aTemp1,

   186 								TUint aTemp2,

   187 								const TUint aK,

   188 								const TUint aWord)

   189 	{

   190 	aTemp1 = aH + SHA256_SIGMA1(aE) + SHA_Ch(aE,aF,aG) + aK + aWord;

   191 	aTemp2 = SHA256_SIGMA0(aA) + SHA_Maj(aA,aB,aC);

   192 	aD = aD + aTemp1;

   193 	aH = aTemp1 + aTemp2;

   194 	}

   195 

   196 static inline void CSHA256_48(	const TUint aA, 

   197 								const TUint aB, 

   198 								const TUint aC,

   199 								TUint& aD, 

   200 								const TUint aE, 

   201 								const TUint aF,

   202 								const TUint aG, 

   203 								TUint& aH,

   204 								TUint aTemp1,

   205 								TUint aTemp2,

   206 								const TUint aK,

   207 								TUint& aWord0,

   208 								const TUint aWord2,

   209 								const TUint aWord7,

   210 								const TUint aWord15,

   211 								const TUint aWord16)

   212 	{

   213 	aWord0 = SHA256_sigma1(aWord2) + aWord7 + SHA256_sigma0(aWord15) + aWord16;

   214 	CSHA256_16(aA, aB, aC, aD, aE, aF, aG, aH, aTemp1, aTemp2, aK, aWord0);

   215 	}

   216 

   217 /**

   218  * This function actually calculates the hash.

   219  * Function is defined in FIPS 180-2 section 6.2.2

   220  * 

   221  * This function is the expanded version of the following loop.

   222  *	for(TUint i = 0; i < 64; ++i)

   223  *		{

   224  *		if(i >= 16)

   225  *			{

   226  * 			iData[i] = SHA256_sigma1(iData[i-2]) + iData[i-7] + SHA256_sigma0(iData[i-15]) + iData[i-16];

   227  *			}

   228  *

   229  *		temp1 = tempH + SHA256_SIGMA1(tempE) + SHA_Ch(tempE,tempF,tempG) + K[i] + iData[i];

   230  *		temp2 = SHA256_SIGMA0(tempA) + SHA_Maj(tempA,tempB,tempC);

   231  *	    tempH = tempG;

   232  *	    tempG = tempF;

   233  *	    tempF = tempE;

   234  *	    tempE = tempD + temp1;

   235  *	    tempD = tempC;

   236  *	    tempC = tempB;

   237  *	    tempB = tempA;

   238  *	    tempA = temp1 + temp2;		

   239  *		}

   240  */

   241 void CSHA224And256::Block()

   242 	{

   243 	TUint tempA=iA;

   244 	TUint tempB=iB;

   245 	TUint tempC=iC;

   246 	TUint tempD=iD;

   247 	TUint tempE=iE;

   248 	TUint tempF=iF;

   249 	TUint tempG=iG;

   250 	TUint tempH=iH;

   251 	TUint temp1=0;

   252 	TUint temp2=0;

   253 	

   254 	CSHA256_16(tempA,tempB,tempC,tempD,tempE,tempF,tempG,tempH,temp1,temp2,K[0],iData[0]);

   255 	CSHA256_16(tempH,tempA,tempB,tempC,tempD,tempE,tempF,tempG,temp1,temp2,K[1],iData[1]);

   256 	CSHA256_16(tempG,tempH,tempA,tempB,tempC,tempD,tempE,tempF,temp1,temp2,K[2],iData[2]);

   257 	CSHA256_16(tempF,tempG,tempH,tempA,tempB,tempC,tempD,tempE,temp1,temp2,K[3],iData[3]);

   258 	CSHA256_16(tempE,tempF,tempG,tempH,tempA,tempB,tempC,tempD,temp1,temp2,K[4],iData[4]);

   259 	CSHA256_16(tempD,tempE,tempF,tempG,tempH,tempA,tempB,tempC,temp1,temp2,K[5],iData[5]);

   260 	CSHA256_16(tempC,tempD,tempE,tempF,tempG,tempH,tempA,tempB,temp1,temp2,K[6],iData[6]);

   261 	CSHA256_16(tempB,tempC,tempD,tempE,tempF,tempG,tempH,tempA,temp1,temp2,K[7],iData[7]);

   262 

   263 	CSHA256_16(tempA,tempB,tempC,tempD,tempE,tempF,tempG,tempH,temp1,temp2,K[8],iData[8]);

   264 	CSHA256_16(tempH,tempA,tempB,tempC,tempD,tempE,tempF,tempG,temp1,temp2,K[9],iData[9]);

   265 	CSHA256_16(tempG,tempH,tempA,tempB,tempC,tempD,tempE,tempF,temp1,temp2,K[10],iData[10]);

   266 	CSHA256_16(tempF,tempG,tempH,tempA,tempB,tempC,tempD,tempE,temp1,temp2,K[11],iData[11]);

   267 	CSHA256_16(tempE,tempF,tempG,tempH,tempA,tempB,tempC,tempD,temp1,temp2,K[12],iData[12]);

   268 	CSHA256_16(tempD,tempE,tempF,tempG,tempH,tempA,tempB,tempC,temp1,temp2,K[13],iData[13]);

   269 	CSHA256_16(tempC,tempD,tempE,tempF,tempG,tempH,tempA,tempB,temp1,temp2,K[14],iData[14]);

   270 	CSHA256_16(tempB,tempC,tempD,tempE,tempF,tempG,tempH,tempA,temp1,temp2,K[15],iData[15]);

   271 

   272 	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,

   273 				K[16], iData[16], iData[14], iData[9], iData[1], iData[0]);

   274 	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,

   275 				K[17], iData[17], iData[15], iData[10], iData[2], iData[1]);

   276 	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,

   277 				K[18], iData[18], iData[16], iData[11], iData[3], iData[2]);

   278 	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,

   279 				K[19], iData[19], iData[17], iData[12], iData[4], iData[3]);

   280 	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,

   281 				K[20], iData[20], iData[18], iData[13], iData[5], iData[4]);

   282 	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,

   283 				K[21], iData[21], iData[19], iData[14], iData[6], iData[5]);

   284 	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,

   285 				K[22], iData[22], iData[20], iData[15], iData[7], iData[6]);

   286 	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,

   287 				K[23], iData[23], iData[21], iData[16], iData[8], iData[7]);

   288 

   289 	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,

   290 				K[24], iData[24], iData[22], iData[17], iData[9], iData[8]);

   291 	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,

   292 				K[25], iData[25], iData[23], iData[18], iData[10], iData[9]);

   293 	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,

   294 				K[26], iData[26], iData[24], iData[19], iData[11], iData[10]);

   295 	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,

   296 				K[27], iData[27], iData[25], iData[20], iData[12], iData[11]);

   297 	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,

   298 				K[28], iData[28], iData[26], iData[21], iData[13], iData[12]);

   299 	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,

   300 				K[29], iData[29], iData[27], iData[22], iData[14], iData[13]);

   301 	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,

   302 				K[30], iData[30], iData[28], iData[23], iData[15], iData[14]);

   303 	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,

   304 				K[31], iData[31], iData[29], iData[24], iData[16], iData[15]);

   305 

   306 	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,

   307 				K[32], iData[32], iData[30], iData[25], iData[17], iData[16]);

   308 	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,

   309 				K[33], iData[33], iData[31], iData[26], iData[18], iData[17]);

   310 	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,

   311 				K[34], iData[34], iData[32], iData[27], iData[19], iData[18]);

   312 	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,

   313 				K[35], iData[35], iData[33], iData[28], iData[20], iData[19]);

   314 	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,

   315 				K[36], iData[36], iData[34], iData[29], iData[21], iData[20]);

   316 	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,

   317 				K[37], iData[37], iData[35], iData[30], iData[22], iData[21]);

   318 	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,

   319 				K[38], iData[38], iData[36], iData[31], iData[23], iData[22]);

   320 	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,

   321 				K[39], iData[39], iData[37], iData[32], iData[24], iData[23]);

   322 

   323 	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,

   324 				K[40], iData[40], iData[38], iData[33], iData[25], iData[24]);

   325 	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,

   326 				K[41], iData[41], iData[39], iData[34], iData[26], iData[25]);

   327 	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,

   328 				K[42], iData[42], iData[40], iData[35], iData[27], iData[26]);

   329 	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,

   330 				K[43], iData[43], iData[41], iData[36], iData[28], iData[27]);

   331 	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,

   332 				K[44], iData[44], iData[42], iData[37], iData[29], iData[28]);

   333 	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,

   334 				K[45], iData[45], iData[43], iData[38], iData[30], iData[29]);

   335 	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,

   336 				K[46], iData[46], iData[44], iData[39], iData[31], iData[30]);

   337 	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,

   338 				K[47], iData[47], iData[45], iData[40], iData[32], iData[31]);

   339 

   340 	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,

   341 				K[48], iData[48], iData[46], iData[41], iData[33], iData[32]);

   342 	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,

   343 				K[49], iData[49], iData[47], iData[42], iData[34], iData[33]);

   344 	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,

   345 				K[50], iData[50], iData[48], iData[43], iData[35], iData[34]);

   346 	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,

   347 				K[51], iData[51], iData[49], iData[44], iData[36], iData[35]);

   348 	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,

   349 				K[52], iData[52], iData[50], iData[45], iData[37], iData[36]);

   350 	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,

   351 				K[53], iData[53], iData[51], iData[46], iData[38], iData[37]);

   352 	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,

   353 				K[54], iData[54], iData[52], iData[47], iData[39], iData[38]);

   354 	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,

   355 				K[55], iData[55], iData[53], iData[48], iData[40], iData[39]);

   356 

   357 	CSHA256_48(	tempA, tempB, tempC, tempD, tempE, tempF, tempG, tempH, temp1, temp2,

   358 				K[56], iData[56], iData[54], iData[49], iData[41], iData[40]);

   359 	CSHA256_48(	tempH, tempA, tempB, tempC, tempD, tempE, tempF, tempG, temp1, temp2,

   360 				K[57], iData[57], iData[55], iData[50], iData[42], iData[41]);

   361 	CSHA256_48(	tempG, tempH, tempA, tempB, tempC, tempD, tempE, tempF, temp1, temp2,

   362 				K[58], iData[58], iData[56], iData[51], iData[43], iData[42]);

   363 	CSHA256_48(	tempF, tempG, tempH, tempA, tempB, tempC, tempD, tempE, temp1, temp2,

   364 				K[59], iData[59], iData[57], iData[52], iData[44], iData[43]);

   365 	CSHA256_48(	tempE, tempF, tempG, tempH, tempA, tempB, tempC, tempD, temp1, temp2,

   366 				K[60], iData[60], iData[58], iData[53], iData[45], iData[44]);

   367 	CSHA256_48(	tempD, tempE, tempF, tempG, tempH, tempA, tempB, tempC, temp1, temp2,

   368 				K[61], iData[61], iData[59], iData[54], iData[46], iData[45]);

   369 	CSHA256_48(	tempC, tempD, tempE, tempF, tempG, tempH, tempA, tempB, temp1, temp2,

   370 				K[62], iData[62], iData[60], iData[55], iData[47], iData[46]);

   371 	CSHA256_48(	tempB, tempC, tempD, tempE, tempF, tempG, tempH, tempA, temp1, temp2,

   372 				K[63], iData[63], iData[61], iData[56], iData[48], iData[47]);

   373 

   374 	iA+=tempA;

   375 	iB+=tempB;

   376 	iC+=tempC;

   377 	iD+=tempD;

   378 	iE+=tempE;

   379 	iF+=tempF;

   380 	iG+=tempG;

   381 	iH+=tempH;

   382 

   383 	iNl=0;

   384 	}

   385 

   386 /**

   387  * According to the standard, the message must be padded to an

   388  * even 512 bits. The first padding bit must be a '1'. The last

   389  * 64 bits represent the length of the original message. All bits 

   390  * in between should be 0. This helper function will pad the 

   391  * message according to those rules by filling the iData array 

   392  * accordingly. 

   393  */ 

   394 void CSHA224And256::PadMessage()

   395 	{

   396 	const TUint padByte = 0x80;

   397 	

   398 	if(!(iNl&0x03))

   399 		{

   400 		iData[iNl >> 2] = 0;

   401 		}

   402 	iData[iNl >> 2] |= padByte << ((3 - iNl&0x03) << 3) ;

   403 

   404 	if (iNl >= (KSHA256BlockSize - 2*sizeof(TUint))) 

   405 		{

   406 		if (iNl < (KSHA256BlockSize - sizeof(TUint)))

   407 			iData[(KSHA256BlockSize >> 2) - 1]=0;		

   408 		Block();

   409 		Mem::FillZ(iData, KSHA256BlockSize);

   410 		} 

   411 	else

   412 		{

   413 		const TUint offset=(iNl+4)>>2; //+4 to account for the word added in the

   414 		//switch statement above

   415 		Mem::FillZ(iData+offset,(KSHA256BlockSize - offset*sizeof(TUint)));

   416 		}

   417 

   418 	//Length in bits

   419 	TUint64 msgLength = iNh;

   420 

   421 	iData[(KSHA256BlockSize >> 2) - 2] = (msgLength) >> 32;

   422 	iData[(KSHA256BlockSize >> 2) - 1] = (msgLength & 0xFFFFFFFF);	

   423 	}

   424 

   425 inline void CSHA224And256::CopyWordToHash(TUint aVal, TUint aIndex)

   426 	{

   427 	TUint value = MakeWord(reinterpret_cast<TUint8*>(&aVal));

   428 	Mem::Copy(const_cast<TUint8*>(iHash.Ptr())+ (4*aIndex), &value, sizeof(aVal));

   429 	}

   430 

   431 const TDes8& CSHA224And256::Final()

   432 	{

   433 	AddLength(iNl);

   434 	PadMessage();

   435 	Block();

   436 	//

   437 	// Generate hash value into iHash

   438 	//

   439 	CopyWordToHash(iA, 0);

   440 	CopyWordToHash(iB, 1);

   441 	CopyWordToHash(iC, 2);

   442 	CopyWordToHash(iD, 3);

   443 	CopyWordToHash(iE, 4);

   444 	CopyWordToHash(iF, 5);

   445 	CopyWordToHash(iG, 6);

   446 	CopyWordToHash(iH, 7);

   447 	

   448 	return iHash;

   449 	}

   450 

   451 void CSHA224And256::RestoreState()

   452 	{

   453 	iA = iACopy;

   454 	iB = iBCopy;

   455 	iC = iCCopy;

   456 	iD = iDCopy;

   457 	iE = iECopy;

   458 	iF = iFCopy;

   459 	iG = iGCopy;

   460 	iH = iHCopy;

   461 	iNl = iNlCopy;

   462 	iNh = iNhCopy;	

   463 	Mem::Copy(iData, iDataCopy, KSHA256BlockSize*sizeof(TUint)); 

   464 	}

   465 

   466 void CSHA224And256::StoreState()

   467 	{

   468 	iACopy = iA;

   469 	iBCopy = iB;

   470 	iCCopy = iC;

   471 	iDCopy = iD;

   472 	iECopy = iE;

   473 	iFCopy = iF;

   474 	iGCopy = iG;

   475 	iHCopy = iH;

   476 	iNlCopy = iNl;

   477 	iNhCopy = iNh;	

   478 	Mem::Copy(iDataCopy, iData, KSHA256BlockSize*sizeof(TUint));

   479 	}

   480 

   481 // Implemented in hmacimpl.cpp or softwarehashbase.cpp

   482 // but required as derived from MHash. No coverage here.

   483 #ifdef _BullseyeCoverage

   484 #pragma suppress_warnings on

   485 #pragma BullseyeCoverage off

   486 #pragma suppress_warnings off

   487 #endif