/*

* Copyright (c) 2000-2009 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: 

* ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the 

* Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.

* This header contains the definition of the message digest classes

*

*/

/**

 @file 

 @publishedAll

 @released

*/

#ifndef __HASH_H__

#define __HASH_H__

#include <e32base.h>

/**

 * Base class for message digests.

 */

class CMessageDigest:public CBase

	{

	public:

	/**

	 *	Enumeration to identify hash functions (aka message-digest algorithms).

	 */

	enum THashId

	{

		/** 

		 * Message Digest algorithm developed by Rivest for digital signature

		 * applications (and optimized for 8-bit machines). 

		 * 

		 * Takes a message of arbitrary length and produces a 128-bit message digest. 

		 *

		 * See RFC 1319

		 */

		EMD2,

		/** 

		 * Message Digest algorithm developed by Rivest for digital signature

		 * applications (and optimized for 32-bit machines). 

		 * 

		 * Takes a message of arbitrary length and produces a 128-bit message digest. 

		 * 

		 * See RFC 1321

		 */

		EMD5,

		/** 

		 * Secure Hash Algorithm (version 1) is a message digest algorithm developed by 

		 * NIST, along with the NSA, for use with the Digital Signature Standard (DSS).

		 * 

		 * It takes a message of less than 2^64 bits in length and produces

		 * a 160-bit message digest.

		 *

		 * See FIPS 180-1 and RFC 3174

		 */

		ESHA1,

		/** 

		 * HMAC - Hash function based Message Authentication Code is a mechanism

		 * for message authentication using cryptographic hash functions. (A checksum.)

		 * 

		 * It can be used with any iterative cryptographic hash function,

   		 * e.g., MD5, SHA-1, in combination with a secret shared key

   		 * to produce a checksum that is appended to the message.

   		 * The cryptographic strength of HMAC depends on the properties

   		 * of the underlying hash function.

		 *

		 * See RFC 2104 

		 */

		HMAC,

		/** 

		 * Message Digest algorithm developed by Rivest for digital signature

		 * applications (and optimized for 32-bit machines). 

		 * 

		 * Takes a message of arbitrary length and produces a 128-bit message digest. 

		 * 

		 * See RFC 1320

		 */

		EMD4,

		/** 

		 * Secure Hash Algorithm - 224 (version 2) is a message digest algorithm developed by 

		 * NIST, along with the NSA, for use with the Digital Signature Standard (DSS).

		 * 

		 * It takes a message of less than 2^64 bits in length and produces

		 * a 224-bit message digest.

		 *

		 * See FIPS 180-2 (with change notice), RFC3874 and FIPS 180-3

		 */

		ESHA224,

		/** 

		 * Secure Hash Algorithm - 256 (version 2) is a message digest algorithm developed by 

		 * NIST, along with the NSA, for use with the Digital Signature Standard (DSS).

		 * 

		 * It takes a message of less than 2^64 bits in length and produces

		 * a 256-bit message digest.

		 *

		 * See FIPS 180-2 and RFC 4634

		 */

		ESHA256,

		/** 

		 * Secure Hash Algorithm - 384 (version 2) is a message digest algorithm developed by 

		 * NIST, along with the NSA, for use with the Digital Signature Standard (DSS).

		 * 

		 * It takes a message of less than 2^128 bits in length and produces

		 * a 384-bit message digest.

		 *

		 * See FIPS 180-2 and RFC 4634

		 */

		ESHA384,

		/** 

		 * Secure Hash Algorithm - 512 (version 2) is a message digest algorithm developed by 

		 * NIST, along with the NSA, for use with the Digital Signature Standard (DSS).

		 * 

		 * It takes a message of less than 2^128 bits in length and produces

		 * a 512-bit message digest.

		 *

		 * See FIPS 180-2 and RFC 4634

		 */

		ESHA512

	};

	public:

		/** 

		 * Creates a brand new reset CMessageDigest object containing no state

		 * information from the current object.  

		 * 

		 * To make a copy of a message digest with its internal state intact,

		 * see CopyL().

		 *

		 * @return A pointer to the new reset CMessageDigest object

		 */

		IMPORT_C virtual CMessageDigest* ReplicateL(void)=0;		

		/** 

		 * Adds aMessage to the internal representation of data to be hashed,

		 * then returns a TPtrC8 of the finalised hash of all the previously

		 * appended messages.

		 * 

		 * @param aMessage	Data to be included in the hash.

		 * @return			A descriptor pointer to the buffer containing the

		 *					resulting hash.

		 */

		IMPORT_C virtual TPtrC8 Hash(const TDesC8& aMessage)=0;

		/** 

		 * Creates a new CMessageDigest object with the exact same state as

		 * the current object.  

		 *

		 * This function copies all internal state of the message digest.

		 * To create a new CMessageDigest object without the state of

		 * the current object, see ReplicateL().

		 *

		 * @return A pointer to the new CMessageDigest object

		 */

		IMPORT_C virtual CMessageDigest* CopyL(void)=0;

		/** 

		 * Gets the internal block size of the message digest.

		 * 

		 * @return	Internal block size of message digest in bytes.

		 */

		IMPORT_C virtual TInt BlockSize(void)=0;

		/** 

		 * Gets the size of the message digest output.

		 *

		 * @return	Output size of the message digest in bytes.

		 */

		IMPORT_C virtual TInt HashSize(void)=0;

		/** 

		 * Resets the internal state of the message digest.  

		 *

		 * A reset hash object loses all internal state representing the hashed

		 * data. A reset message digest is suitable to begin a new, distinct hash

		 * of different data.  Any previously returned TPtrC8 from a call to

		 * Final() remains valid until any subsequent call to Update() or

		 * Final().

		 */

		IMPORT_C virtual void Reset(void)=0;

		/**

		 * Destructor.

		 */		

		IMPORT_C ~CMessageDigest(void);

	public:

		/** 

		 * Adds data to the internal representation of messages to be hashed.

		 *

		 * @param aMessage	Data to be included in the hash.

		 * @since v8.0

		 */

		IMPORT_C virtual void Update(const TDesC8& aMessage)=0;

		/** 

		 * Adds aMessage to the internal representation of data to be hashed,

		 * returns a TPtrC8 of the finalised hash of all the previously

		 * appended messages, and calls Reset().

		 * 

		 * @param aMessage	Data to be included in the hash 

		 * @return			A descriptor pointer to the buffer containing the

		 *					resulting hash.

		 * @since v8.0

		 */

		IMPORT_C virtual TPtrC8 Final(const TDesC8& aMessage)=0;

		/** 

		 * Gets a TPtrC8 of the finalised hash of all the previously

		 * appended messages and then calls Reset().

		 * 

		 * @return	A descriptor pointer to the buffer containing the

		 * 			resulting hash.

		 * @since v8.0

		 */

		IMPORT_C virtual TPtrC8 Final(void)=0;

	public:

		/**

		 * Restores the internal state of the message digest

		 * to a previously stored state.

		 *

		 * @see StoreState()

		 */

		virtual void RestoreState() = 0;

		/**

		 * Stores the internal state of the message digest. 

		 */

		virtual void StoreState() = 0;

		/**

		@internalComponent

		Used to retrieve the extended interfaces extension

		*/		

		TInt GetExtension(TUint aExtensionId, TAny*& a0, TAny* a1);		

	protected:

		/**

		 * Constructor

		 */

		IMPORT_C CMessageDigest(void);

		/**

		 * Copy constructor

		 *

		 * @param aMD	A CMessageDigest object

		 */

		IMPORT_C CMessageDigest(const CMessageDigest& aMD);

	};

/** 

The MD2 block size (in bytes) 

*/

const TInt MD2_BLOCK=16;

/** 

The size (in bytes) of the MD2 message digest 

*/

const TInt MD2_HASH=16;

/**

 * An MD2 message digest

 */

class CMD2:public CMessageDigest

	{

	public:

		/**

		 * Creates a new MD2 object.

		 *

		 * @return	A pointer to the new CMD2 object

		 */

		IMPORT_C static CMD2* NewL(void);

		IMPORT_C CMessageDigest* ReplicateL(void);

		IMPORT_C TPtrC8 Hash(const TDesC8& aMessage);

		/** Destructor */

		IMPORT_C ~CMD2(void);

		IMPORT_C CMessageDigest* CopyL(void);

		IMPORT_C TInt BlockSize(void);

		IMPORT_C TInt HashSize(void);

		IMPORT_C void Reset(void);

		IMPORT_C void Update(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final();

	public:

		void RestoreState();

		void StoreState();

	protected:	

		/** @internalComponent */

		CMD2(void);

	};

/** 

The MD5 block size (in bytes)

*/

const TUint MD5_LBLOCK=16;

/** 

The size (in bytes) of the MD5 message digest 

*/

const TUint MD5_HASH=16;

/**

 * An MD5 message digest

 *

 * Takes a message of arbitrary length as input and produces a 128-bit message digest. 

 * 

 * The total input length of data should not be longer than 2^32 in bits(2^31 in bytes)

 * which is roughly half a gig.

 *

 */

class CMD5:public CMessageDigest

	{

	public:

		/**

		 * Creates a new MD5 object.

		 *

		 * @return	A pointer to the new CMD5 object

		 */

		IMPORT_C static CMD5* NewL(void);

		IMPORT_C CMessageDigest* ReplicateL(void);

		IMPORT_C TPtrC8 Hash(const TDesC8& aMessage);

		/** Destructor */

		IMPORT_C ~CMD5(void);

		IMPORT_C CMessageDigest* CopyL(void);

		IMPORT_C TInt BlockSize(void);

		IMPORT_C TInt HashSize(void);

		IMPORT_C void Reset(void);

		IMPORT_C void Update(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final();

	public:

		void RestoreState();

		void StoreState();

	protected:

		/** @internalComponent */

		CMD5(void);

	};

/** 

The SHA-1 block size (in bytes) 

*/

const TUint SHA1_LBLOCK=16;

/** 

The size (in bytes) of the SHA-1 message digest 

*/

const TUint SHA1_HASH=20;

/** 

The size (in bytes) of the SHA message digest 

*/

const TUint SHA_HASH=SHA1_HASH;

/**

 * A SHA-1 message digest

 */

class CSHA1:public CMessageDigest

	{

	public:

		/**

		 * Creates a new SHA-1 object.

		 *

		 * @return	A pointer to the new SHA-1 object

		 */

		IMPORT_C static CSHA1* NewL(void);

		IMPORT_C CMessageDigest* ReplicateL(void);

		IMPORT_C TPtrC8 Hash(const TDesC8& aMessage);

		/** Destructor */

		IMPORT_C ~CSHA1(void);

		IMPORT_C CMessageDigest* CopyL(void);

		IMPORT_C TInt BlockSize(void);

		IMPORT_C TInt HashSize(void);

		IMPORT_C void Reset(void);

		IMPORT_C void Update(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final();

	public:

		void RestoreState();

		void StoreState();

	protected:

		/** @internalComponent */

		CSHA1(void);

	};

enum TSH2Algo

	{

	E224Bit,

	E256Bit,

	E384Bit,

	E512Bit

	};

/**

 * A SHA-2 message digest

 * 

 * SHA-2 is comprised of SHA-224, SHA256, SHA384 and SHA512

 */

class CSHA2 : public CMessageDigest

	{

	public:

		/**

		 * Creates a new SHA-1 object.

		 *

		 * @return	A pointer to the new SHA-1 object

		 */

		IMPORT_C static CSHA2* NewL(TSH2Algo aAlgorithmId);

		IMPORT_C static CSHA2* NewLC(TSH2Algo aAlgorithmId);

		/** Destructor */

		IMPORT_C ~CSHA2(void);

	public:

		void RestoreState();

		void StoreState();		

	protected:

		/** @internalComponent */

		CSHA2(void);

	};	

/**

 * A SHA message digest

 *

 * @deprecated Replaced by CSHA1

 */

class CSHA:public CMessageDigest

	{

	public:

		/**

		 * Creates a new SHA object.

		 *

		 * @return	A pointer to the new SHA object

		 */

		IMPORT_C static CSHA* NewL(void);

		IMPORT_C CMessageDigest* ReplicateL(void);

		IMPORT_C TPtrC8 Hash(const TDesC8& aMessage);

		/** Destructor */

		IMPORT_C ~CSHA(void);

		IMPORT_C CMessageDigest* CopyL(void);

		IMPORT_C TInt BlockSize(void);

		IMPORT_C TInt HashSize(void);

		IMPORT_C void Reset(void);

		IMPORT_C void Update(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final();

	public:

		void RestoreState();

		void StoreState();

	};

/**

 * This is the maximum block size currently supported by HMAC implementation.

 */ 

const TUint KMaxBlockSize=128;

/**

 * An HMAC (Hashed Message Authentication Code)

 */

class CHMAC:public CMessageDigest

	{

	public:

		/**

		 * Creates a new HMAC object from a specified type of message digest 

		 * and authentication key.

		 * 

		 * @param aKey		Authentication key.

		 * @param aDigest	A message digest to construct the HMAC from.

		 * @return			A pointer to the new CHMAC object. 

		 *					The resulting HMAC object takes ownership of aDigest

		 *					and is responsible for its deletion.

		 */

		IMPORT_C static CHMAC* NewL(const TDesC8& aKey,CMessageDigest* aDigest);

		IMPORT_C CMessageDigest* ReplicateL(void);

		IMPORT_C TPtrC8 Hash(const TDesC8& aMessage);

		/** Destructor */

		IMPORT_C ~CHMAC(void);

		IMPORT_C CMessageDigest* CopyL(void);

		IMPORT_C TInt BlockSize(void);

		IMPORT_C TInt HashSize(void);

		IMPORT_C void Reset(void);

		IMPORT_C void Update(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final(const TDesC8& aMessage);

		IMPORT_C TPtrC8 Final();

	public:

		void RestoreState();

		void StoreState();

	protected:

		/** @internalComponent */

		CHMAC(void);

		/** @internalComponent */

		CHMAC(CMessageDigest* aDigest);

		/** @internalComponent */

		CHMAC(const CHMAC& aHMAC);

		/** @internalComponent */

		void InitialiseL(const TDesC8& aKey);

	private:

		void InitBlockSizeL();

	private:

		CMessageDigest* iDigest;

		TBuf8<KMaxBlockSize> iInnerPad;

		TBuf8<KMaxBlockSize> iOuterPad;

		TBuf8<KMaxBlockSize> iInnerPadCopy;

		TBuf8<KMaxBlockSize> iOuterPadCopy;		

		TInt iBlockSize;

	};

/** 

The MD4 block size (in bytes)

*/

const TUint MD4_LBLOCK=16;