author | hgs |
Fri, 06 Aug 2010 15:42:13 +0300 | |
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parent 0 | 1bce908db942 |
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/* |
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* Copyright (c) 2006-2007 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 "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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* |
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*/ |
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#ifndef CNATFWUNSAFMESSAGEINTEGRITYATTRIBUTE_H |
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#define CNATFWUNSAFMESSAGEINTEGRITYATTRIBUTE_H |
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// INCLUDES |
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#include <in_sock.h> |
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#include <hash.h> |
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#include "natfwunsafattribute.h" |
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#include "natfwinternaldefs.h" //UNIT_TEST |
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// FORWARD DECLARATIONS |
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// CLASS DECLARATION |
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/** |
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* Class for NATFWUNSAF MESSAGE-INTEGRITY attribute. |
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*/ |
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class CNATFWUNSAFMessageIntegrityAttribute : public CNATFWUNSAFAttribute |
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{ |
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public: |
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//STUN RFC: size is 20 bytes |
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typedef TBuf8<SHA1_HASH> TSHA1_Hash; |
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public: // Constructors and destructor |
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/** |
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* Constructs a CNATFWUNSAFMessageIntegrityAttribute from |
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* its value part's binary representation |
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* @param aValue a value part of a MESSAGE-INTEGRITY-attribute |
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* @return A new instance of CNATFWUNSAFMessageIntegrityAttribute, |
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* ownership is transferred. |
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*/ |
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static CNATFWUNSAFMessageIntegrityAttribute* DecodeL( |
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const TDesC8& aValue); |
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/** |
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* Decodes a UNSAF attribute from a byte stream. |
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* This version is for lookup table. |
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* @param aByteStream Byte stream, containing attribute type, length and |
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* value. |
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* @return Decoded UNSAF attribute, ownership is transferred. |
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*/ |
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static CNATFWUNSAFAttribute* DecodeAttributeL( |
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const TDesC8& aByteStream); |
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/** |
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* Creates a new instance of CNATFWUNSAFMessageIntegrityAttribute |
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* @param aSharedSecret Key for computing HMAC |
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* @param aNATFWUNSAFMessage Message to be hashed |
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* @param aLongTerm Flag for using long term shared secret |
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* @return A new instance of CNATFWUNSAFMessageIntegrityAttribute, |
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* ownership is transferred. |
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*/ |
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IMPORT_C static CNATFWUNSAFMessageIntegrityAttribute* |
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NewL(const TDesC8& aSharedSecret, |
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CBufBase& aNATFWUNSAFMessage, |
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TBool aLongTerm=EFalse); |
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/** |
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* Creates a new instance of CNATFWUNSAFMessageIntegrityAttribute and |
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* pushes it to the CleanupStack. |
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* @param aSharedSecret Key for computing HMAC |
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* @param aNATFWUNSAFMessage Message to be hashed |
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* @param aLongTerm Flag for using long term shared secret |
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* @return A new instance of CNATFWUNSAFMessageIntegrityAttribute, |
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* ownership is transferred. |
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*/ |
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IMPORT_C static CNATFWUNSAFMessageIntegrityAttribute* |
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NewLC(const TDesC8& aSharedSecret, |
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CBufBase& aNATFWUNSAFMessage, |
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TBool aLongTerm=EFalse); |
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/** |
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* Destructor, deletes the resources of |
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* CNATFWUNSAFMessageIntegrityAttribute. |
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*/ |
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~CNATFWUNSAFMessageIntegrityAttribute(); |
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public: // From CNATFWUNSAFAttribute |
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CNATFWUNSAFAttribute::TType Type() const; |
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HBufC8* EncodeValueL() const; |
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public: // New functions |
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/** |
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* Computes a HMAC for aNATFWUNSAFMessage using aSharedSecret as a key, |
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* and compares the result with the value of this |
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* CNATFWUNSAFMessageIntegrityAttribute instance. |
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* @param aNATFWUNSAFMessage UNSAF message as byte stream |
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* @param aSharedSecret Key for computing the HMAC |
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* @return ETrue Message integrity check passes |
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* EFalse Otherwise, HMAC differs |
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*/ |
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IMPORT_C TBool CheckMessageIntegrityL(const TDesC8& aNATFWUNSAFMessage, |
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const TDesC8& aSharedSecret) const; |
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|
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/** |
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* Sets either long or short term credentials to use. This has an impact |
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* on how the key for HMAC is calculated. The users of this object |
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* should set this flag on whenever they receive a message containing a |
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* REALM attribute. |
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* @param aLongTerm ETrue if long term credentials are to be used |
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* EFalse if short term credentials are to be used |
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*/ |
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IMPORT_C void UseLongTermCredentials(TBool aLongTerm); |
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|
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protected: // New functions |
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/** |
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* Decodes the value part of the attribute and updates iHash |
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* accordingly. |
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* @param aValue value to be decoded |
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*/ |
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void DecodeValueL(const TDesC8& aValue); |
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|
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/** |
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* Check the attribute's length field has a valid value. |
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* @param aByteStream Stream containing attribute in binary format, |
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* starting from the type-field. |
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* @leave KErrCorrupt If the length field in aByteStream is invalid |
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*/ |
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static void CheckLengthL(const TDesC8& aByteStream); |
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private: // Enumerations |
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|
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enum THashBlock |
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{ |
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// The size of the data to be hashed, is a multiple of 64 bytes |
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EInputBlockSize = 64 |
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}; |
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private: // Constructors |
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CNATFWUNSAFMessageIntegrityAttribute(); |
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/** |
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* Second phase constructor. |
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* @param aSharedSecret Key for computing HMAC |
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* @param aNATFWUNSAFMessage Message to be hashed |
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* @param aLongTerm Flag for using long term shared secret |
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*/ |
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void ConstructL(const TDesC8& aSharedSecret, |
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CBufBase& aNATFWUNSAFMessage, |
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TBool aLongTerm); |
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|
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private: // New functions, for internal use |
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|
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/** |
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* Compute a SHA1-HMAC hash over aNATFWUNSAFMessage, |
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* using aSharedSecret as a key. |
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* Write the result into aHash. |
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* @param aSharedSecret Key for computing HMAC |
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* @param aNATFWUNSAFMessage Message to be hashed |
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* @param aHash Resulting hash is written here |
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*/ |
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void ComputeShortTermHMACL(const TDesC8& aSharedSecret, |
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CBufBase& aNATFWUNSAFMessage, |
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TSHA1_Hash& aHash) const; |
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|
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/** |
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* Compute a SHA1-HMAC hash over aNATFWUNSAFMessage, |
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* using the MD-5 hashed aSharedSecret as a key. |
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* Write the result into aHash. |
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* @param aSharedSecret Key for computing HMAC |
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* @param aNATFWUNSAFMessage Message to be hashed |
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* @param aHash Resulting hash is written here |
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*/ |
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void ComputeLongTermHMACL(const TDesC8& aSharedSecret, |
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CBufBase& aNATFWUNSAFMessage, |
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TSHA1_Hash& aHash) const; |
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|
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void DoComputeSHA1L(TSHA1_Hash& aHash, |
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CHMAC* aHmac, |
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CBufBase& aNATFWUNSAFMessage) const; |
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private: // Data |
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TSHA1_Hash iHash; |
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TBool iLongTerm; |
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|
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private: // For testing purposes |
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UNIT_TEST(UT_CNATFWUNSAFMessageIntegrityAttribute) |
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}; |
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#endif // CNATFWUNSAFMESSAGEINTEGRITYATTRIBUTE_H |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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