Symaptic: os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/sha224and256impl.cpp@bde4ae8d615e

     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 */

    21 /**

    22  @file

    23 */

    26 #include <cryptospi/hashplugin.h>

    27 #include "pluginconfig.h"

    28 #include "sha224and256impl.h"

    30 using namespace SoftwareCrypto;

    32 /**

    33  * SHA256 Constants

    34  *

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

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

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

    38  *

    39  * FIPS 180-2 Section 4.2.2

    40  */

    41 const TUint K[64] =

    42 	{

    43 	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,

    44 	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,

    45 	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,

    46 	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,

    47 	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,

    48 	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,

    49 	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,

    50 	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,

    51 	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,

    52 	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,

    53 	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,

    54 	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,

    55 	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,

    56 	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,

    57 	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,

    58 	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2

    59 	};

    61 /**

    62  * Define the SHA SIGMA and sigma macros

    63  *

    64  * FIPS 180-2 section 4.1.2

    65  */

    66 // Equation 4.4

    67 inline TUint SHA256_SIGMA0(TUint aWord)

    68 	{

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

    70 	}

    71 // Equation 4.5

    72 inline TUint SHA256_SIGMA1(TUint aWord)

    73 	{

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

    75 	}

    76 // Equation 4.6

    77 inline TUint SHA256_sigma0(TUint aWord)

    78 	{

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

    80 	}

    81 // Equation 4.7

    82 inline TUint SHA256_sigma1(TUint aWord)

    83 	{

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

    85 	}

    88 // Macros

    89 inline TUint MakeWord(const TUint8* aData)

    90 	{

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

    92 	}

    95 CSHA224And256Impl* CSHA224And256Impl::NewL()

    96 	{

    97 	CSHA224And256Impl* self=new (ELeave) CSHA224And256Impl();

    98 	return self;

    99 	}

   101 CSHA224And256Impl::CSHA224And256Impl() : iHash(KSHA256HashSize)

   102 	{

   103 	}

   105 CSHA224And256Impl::CSHA224And256Impl(const CSHA224And256Impl& aSHA256Impl)

   106 				: 	iHash(aSHA256Impl.iHash),

   107 					iA(aSHA256Impl.iA),

   108 					iB(aSHA256Impl.iB),

   109 					iC(aSHA256Impl.iC),

   110 					iD(aSHA256Impl.iD),

   111 					iE(aSHA256Impl.iE),

   112 					iF(aSHA256Impl.iF),

   113 					iG(aSHA256Impl.iG),

   114 					iH(aSHA256Impl.iH),

   115 					iNl(aSHA256Impl.iNl),

   116 					iNh(aSHA256Impl.iNh)

   117 	{

   118 	Mem::Copy(iData, aSHA256Impl.iData, KSHA256BlockSize*sizeof(TUint));

   119 	}

   121 void CSHA224And256Impl::Reset(const TAny* aValArray)

   122 	{

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

   124 	/**

   125 	 * Initial Hash Value

   126 	 *

   127 	 * These words were obtained by taking the first thirty-two bits

   128 	 * of the fractional parts of the square roots of the first eight

   129 	 * prime numbers.

   130 	 *

   131 	 * FIPS 180-2 Section 5.3.2

   132 	 */

   133 	iA=values[0];

   134 	iB=values[1];

   135 	iC=values[2];

   136 	iD=values[3];

   137 	iE=values[4];

   138 	iF=values[5];

   139 	iG=values[6];

   140 	iH=values[7];

   141 	iNh=0;

   142 	iNl=0;

   143 	}

   145 // This assumes a big-endian architecture

   146 void CSHA224And256Impl::Update(const TUint8* aData,TUint aLength)

   147 	{

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

   149 		{

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

   151 		iNl+=4;

   152 		aData+=4;

   153 		aLength-=4;

   154 		if(iNl==KSHA256BlockSize)

   155 			{

   156 			Block();

   157 			AddLength(KSHA256BlockSize);

   158 			}

   159 		}

   161 	while(aLength--)

   162 		{

   163 		if(!(iNl&0x03))

   164 			{

   165 			iData[iNl >> 2] = 0;

   166 			}

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

   168 		++aData;

   169 		++iNl;

   170 		if(iNl==KSHA256BlockSize)

   171 			{

   172 			Block();

   173 			AddLength(KSHA256BlockSize);

   174 			}

   175 		}

   176 	}

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

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

   180 inline void CSHA224And256Impl::AddLength(const TUint aLength)

   181 	{

   182 	TUint64 temp = iNh;

   183 	iNh += aLength << 3;

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

   185 	}

   188 static inline void CSHA256_16(	const TUint aA,

   189 								const TUint aB,

   190 								const TUint aC,

   191 								TUint& aD,

   192 								const TUint aE,

   193 								const TUint aF,

   194 								const TUint aG,

   195 								TUint& aH,

   196 								TUint aTemp1,

   197 								TUint aTemp2,

   198 								const TUint aK,

   199 								const TUint aWord)

   200 	{

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

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

   203 	aD = aD + aTemp1;

   204 	aH = aTemp1 + aTemp2;

   205 	}

   207 static inline void CSHA256_48(	const TUint aA,

   208 								const TUint aB,

   209 								const TUint aC,

   210 								TUint& aD,

   211 								const TUint aE,

   212 								const TUint aF,

   213 								const TUint aG,

   214 								TUint& aH,

   215 								TUint aTemp1,

   216 								TUint aTemp2,

   217 								const TUint aK,

   218 								TUint& aWord0,

   219 								const TUint aWord2,

   220 								const TUint aWord7,

   221 								const TUint aWord15,

   222 								const TUint aWord16)

   223 	{

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

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

   226 	}

   228 /**

   229  * This function actually calculates the hash.

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

   231  *

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

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

   234  *		{

   235  *		if(i >= 16)

   236  *			{

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

   238  *			}

   239  *

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

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

   242  *	    tempH = tempG;

   243  *	    tempG = tempF;

   244  *	    tempF = tempE;

   245  *	    tempE = tempD + temp1;

   246  *	    tempD = tempC;

   247  *	    tempC = tempB;

   248  *	    tempB = tempA;

   249  *	    tempA = temp1 + temp2;

   250  *		}

   251  */

   252 void CSHA224And256Impl::Block()

   253 	{

   254 	TUint tempA=iA;

   255 	TUint tempB=iB;

   256 	TUint tempC=iC;

   257 	TUint tempD=iD;

   258 	TUint tempE=iE;

   259 	TUint tempF=iF;

   260 	TUint tempG=iG;

   261 	TUint tempH=iH;

   262 	TUint temp1=0;

   263 	TUint temp2=0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   385 	iA+=tempA;

   386 	iB+=tempB;

   387 	iC+=tempC;

   388 	iD+=tempD;

   389 	iE+=tempE;

   390 	iF+=tempF;

   391 	iG+=tempG;

   392 	iH+=tempH;

   394 	iNl=0;

   395 	}

   397 /**

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

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

   400  * 64 bits represent the length of the original message. All bits

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

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

   403  * accordingly.

   404  */

   405 void CSHA224And256Impl::PadMessage()

   406 	{

   407 	const TUint padByte = 0x80;

   409 	if(!(iNl&0x03))

   410 		{

   411 		iData[iNl >> 2] = 0;

   412 		}

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

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

   416 		{

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

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

   419 		Block();

   420 		Mem::FillZ(iData, KSHA256BlockSize);

   421 		}

   422 	else

   423 		{

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

   425 		//switch statement above

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

   427 		}

   429 	//Length in bits

   430 	TUint64 msgLength = iNh;

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

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

   434 	}

   436 inline void CSHA224And256Impl::CopyWordToHash(TUint aVal, TUint aIndex)

   437 	{

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

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

   440 	}

   442 const TDes8& CSHA224And256Impl::Final()

   443 	{

   444 	AddLength(iNl);

   445 	PadMessage();

   446 	Block();

   447 	//

   448 	// Generate hash value into iHash

   449 	//

   450 	CopyWordToHash(iA, 0);

   451 	CopyWordToHash(iB, 1);

   452 	CopyWordToHash(iC, 2);

   453 	CopyWordToHash(iD, 3);

   454 	CopyWordToHash(iE, 4);

   455 	CopyWordToHash(iF, 5);

   456 	CopyWordToHash(iG, 6);

   457 	CopyWordToHash(iH, 7);

   459 	return iHash;

   460 	}

   462 void CSHA224And256Impl::RestoreState()

   463 	{

   464 	iA = iACopy;

   465 	iB = iBCopy;

   466 	iC = iCCopy;

   467 	iD = iDCopy;

   468 	iE = iECopy;

   469 	iF = iFCopy;

   470 	iG = iGCopy;

   471 	iH = iHCopy;

   472 	iNl = iNlCopy;

   473 	iNh = iNhCopy;

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

   475 	}

   477 void CSHA224And256Impl::StoreState()

   478 	{

   479 	iACopy = iA;

   480 	iBCopy = iB;

   481 	iCCopy = iC;

   482 	iDCopy = iD;

   483 	iECopy = iE;

   484 	iFCopy = iF;

   485 	iGCopy = iG;

   486 	iHCopy = iH;

   487 	iNlCopy = iNl;

   488 	iNhCopy = iNh;

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

   490 	}

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

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

   494 #ifdef _BullseyeCoverage

   495 #pragma suppress_warnings on

   496 #pragma BullseyeCoverage off

   497 #pragma suppress_warnings off

   498 #endif

author	sl@SLION-WIN7.fritz.box
	Fri, 15 Jun 2012 03:10:57 +0200
changeset 0	bde4ae8d615e
permissions	-rw-r--r--