/*

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

 * All rights reserved.

 * This component and the accompanying materials are made available

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

 * which accompanies this distribution, and is available

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

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: 

 * software SHA2 implementation

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

 * FIPS 180-2 (With change notice)

 *

 */

 /**

  @file

 */

 #include <hash.h>

 #include "sha224and256.h"

 #include "sha384and512.h"

 // Initial Hash Values of SHA2 algorithms

 /**

  * Initial Hash Value for SHA-224

  * 

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

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

  * prime numbers.

  * 

  * FIPS 180-2 Appendix

  * FIPS 180-3 Section 5.3.2

  */

 const TUint SHA224InitVals[] = 

     			{

     			0xc1059ed8, // A

     			0x367cd507, // B

     			0x3070dd17, // C

     			0xf70e5939, // D

     			0xffc00b31, // E

     			0x68581511, // F

     			0x64f98fa7, // G

     			0xbefa4fa4  // H

     			};

 /**

  * Initial Hash Value for SHA-256

  * 

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

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

  * prime numbers.

  * 

  * FIPS 180-2 Section 5.3.2

  */

 const TUint SHA256InitVals[] = 

     			{

     			0x6a09e667, // A

     			0xbb67ae85, // B

     			0x3c6ef372, // C

     			0xa54ff53a, // D

     			0x510e527f, // E

     			0x9b05688c, // F

     			0x1f83d9ab, // G

     			0x5be0cd19  // H

     			};

 /**

  * Initial Hash Value for SHA-384

  * 

  *  These words were obtained by taking the first sixty-four bits 

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

  * prime numbers.

  * 

  * FIPS 180-2 Section 5.3.3

  */

 const TUint64 SHA384InitVals[] = 

     			{

     			UI64LIT(0xcbbb9d5dc1059ed8), // A

     			UI64LIT(0x629a292a367cd507), // B

     			UI64LIT(0x9159015a3070dd17), // C

     			UI64LIT(0x152fecd8f70e5939), // D

     			UI64LIT(0x67332667ffc00b31), // E

     			UI64LIT(0x8eb44a8768581511), // F

     			UI64LIT(0xdb0c2e0d64f98fa7), // G

     			UI64LIT(0x47b5481dbefa4fa4)  // H

     			};

 /**

  * Initial Hash Value for SHA-512

  * 

  * These words were obtained by taking the first sixty-four bits 

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

  * prime numbers.

  * 

  * FIPS 180-2 Section 5.3.4

  */

 const TUint64 SHA512InitVals[] = 

     			{

     			UI64LIT(0x6a09e667f3bcc908), // A

     			UI64LIT(0xbb67ae8584caa73b), // B

     			UI64LIT(0x3c6ef372fe94f82b), // C

     			UI64LIT(0xa54ff53a5f1d36f1), // D

     			UI64LIT(0x510e527fade682d1), // E

     			UI64LIT(0x9b05688c2b3e6c1f), // F

     			UI64LIT(0x1f83d9abfb41bd6b), // G

     			UI64LIT(0x5be0cd19137e2179)  // H

     			};

 EXPORT_C CSHA2* CSHA2::NewL(TSH2Algo aAlgorithmId)

 	{

 	CSHA2* self = CSHA2::NewLC(aAlgorithmId);

 	CleanupStack::Pop(self);

 	return self;						

 	}

 EXPORT_C CSHA2* CSHA2::NewLC(TSH2Algo aAlgorithmId)

 	{

 	CSHA2* self = new (ELeave) CSHA2();

 	CleanupStack::PushL(self);

 	self->ConstructL(aAlgorithmId);

 	return self;						

 	}

 void CSHA2::ConstructL(const CSHA2& aSHA2)

 	{

 	iAlgorithmType = aSHA2.iAlgorithmType;

 	iInitValues = aSHA2.iInitValues;

 	iHashSize = aSHA2.iHashSize;

     switch(iAlgorithmType)

 		{

 		case E224Bit:

 		case E256Bit:

 			{

 			const CSHA224And256* const impl = static_cast<CSHA224And256*>(aSHA2.iImplementation);

 			iImplementation = new (ELeave) CSHA224And256(*impl);

 			break;

 			}

 		case E384Bit:

 		case E512Bit:

 			{

 			const CSHA384And512* const impl = static_cast<CSHA384And512*>(aSHA2.iImplementation);

 			iImplementation = new (ELeave) CSHA384And512(*impl);

 			break;

 			}

 		default:

 			{

 			User::Leave(KErrNotSupported);

 			}

 		}

 	}

 void CSHA2::ConstructL(TSH2Algo aAlgorithmId)

     {

     switch(aAlgorithmId)

     	{

     	case E224Bit:

     		{

     		iImplementation = CSHA224And256::NewL();

     		iInitValues = SHA224InitVals;

     		iAlgorithmType = E224Bit;

     		iHashSize = KSHA224HashSize;

     		break;

     		}

     	case E256Bit:

     		{

     		iImplementation = CSHA224And256::NewL();

     		iInitValues = SHA256InitVals;

     		iAlgorithmType = E256Bit;

     		iHashSize = KSHA256HashSize;

     		break;

     		}

     	case E384Bit:

     		{

     		iImplementation = CSHA384And512::NewL();

     		iInitValues = SHA384InitVals;

     		iAlgorithmType = E384Bit;

     		iHashSize = KSHA384HashSize;

     		break;

     		}

     	case E512Bit:

     		{

     		iImplementation = CSHA384And512::NewL();

     		iInitValues = SHA512InitVals;

     		iAlgorithmType = E512Bit;

     		iHashSize = KSHA512HashSize;

     		break;

     		}

     	default:

     		{

     		User::Leave(KErrNotSupported);

     		}

     	}

     Reset();

     }

 EXPORT_C CSHA2::~CSHA2()

 	{

 	delete iImplementation;

 	}

 EXPORT_C CMessageDigest* CSHA2::ReplicateL()

 	{	 

 	return CSHA2::NewL(iAlgorithmType);

 	}

 EXPORT_C TPtrC8 CSHA2::Hash(const TDesC8& aMessage)

 	{

 	TPtrC8 ptr(KNullDesC8());

 	iImplementation->Update(aMessage.Ptr(),aMessage.Size());

 	iImplementation->StoreState();

 	ptr.Set(iImplementation->Final().Ptr(), iHashSize);

 	iImplementation->RestoreState();

 	return ptr;

 	}

 EXPORT_C CMessageDigest* CSHA2::CopyL()

 	{

 	CSHA2* hash = new(ELeave) CSHA2();

 	CleanupStack::PushL(hash);

 	hash->ConstructL(*this);

 	CleanupStack::Pop(hash);

 	return hash;

 	}

 EXPORT_C TInt CSHA2::BlockSize(void)

 	{

 	TInt blockSize = KSHA256BlockSize;

 	if(E384Bit == iAlgorithmType || E512Bit == iAlgorithmType)

 		{

 		blockSize = KSHA512BlockSize;

 		}

 	return blockSize;

 	}

 EXPORT_C TInt CSHA2::HashSize(void)

 	{

 	return iHashSize;

 	}

 EXPORT_C void CSHA2::Reset()

 	{

 	iImplementation->Reset(iInitValues);

 	}

 EXPORT_C void CSHA2::Update(const TDesC8& aMessage)

 	{

 	iImplementation->Update(aMessage.Ptr(),aMessage.Size());	

 	}

 EXPORT_C TPtrC8 CSHA2::Final(void)

 	{

 	TPtrC8 ptr(KNullDesC8());

 	ptr.Set(iImplementation->Final().Ptr(), iHashSize);

 	Reset();

 	return ptr;

 	}

 EXPORT_C TPtrC8 CSHA2::Final(const TDesC8& aMessage)

 	{

 	iImplementation->Update(aMessage.Ptr(),aMessage.Size());			

 	TPtrC8 ptr(KNullDesC8());

 	ptr.Set(iImplementation->Final().Ptr(), iHashSize);

 	Reset();

 	return ptr;

 	}

 void CSHA2::RestoreState()

 	{

 	iImplementation->RestoreState();

 	}

 void CSHA2::StoreState()

 	{

 	iImplementation->StoreState();

 	}

 // Implemented in hmacimpl.cpp or softwarehashbase.cpp

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

 #ifdef _BullseyeCoverage

 #pragma suppress_warnings on

 #pragma BullseyeCoverage off

 #pragma suppress_warnings off

 #endif