author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 26 Jan 2010 15:23:49 +0200 | |
changeset 0 | af10295192d8 |
child 11 | db85996de7c4 |
permissions | -rw-r--r-- |
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// Copyright (c) 2005-2009 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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// crypto.h - IPSEC API towards cryptographic libraries |
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// |
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/** |
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@internalComponent |
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*/ |
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#ifndef __CRYPTO_H__ |
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#define __CRYPTO_H__ |
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/** |
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// @file crypto.h |
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// |
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// The basic API for cryptographic algorithm library. |
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// |
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// IPSEC hook itself does not contain any cryptographic algorithms. |
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// The available algorithms are dynamically imported to the IPSEC |
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// by binding the IPSEC (pfkey) to one or more cryptographic libraries, |
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// each of which are implemented as a protocol.. |
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// |
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// This header describes the basic API and base classes for building |
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// such cryptographic algorithm libraries as protocol modules for IPSEC. |
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// |
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// In the TServerProtocolDesc of such protocol, the following fields |
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// are significant for the IPSEC: |
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// |
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// @li TServerProtocolDesc::iName (protocol name) is the symbolic |
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// name of the library. When multiple libraries are used, |
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// they should have different names. |
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// @li TServerProtocolDesc::iAddrFamily should be KAfCrypto |
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// @li TServerProtocolDesc::iProtocol must be KProtocolCrypto |
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// |
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// The remaining fields can be freely initialized to any values |
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// that satisfy the SocketServer requirements. The chosen values |
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// will have no effect on the IPSEC functionality. |
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// |
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// The cryptographic library protocol can be implemented in any |
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// protocol module (PRT file) along with other protocols. The |
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// value KProtocolCrypto alone in iProtocol tells that the protocol |
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// supports the API defined by this definition. |
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// |
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// An example of possible Ipsec configuration (ESK file) |
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// @verbatim |
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[sockman] |
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protocols= secpol,pfkey,lib1,lib2 |
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[pfkey] |
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filename= ipsec6.prt |
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index= 2 |
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bindto= lib1,lib2 |
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[secpol] |
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filename= ipsec6.prt |
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index= 1 |
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bindto= pfkey,ip6 |
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[lib1] |
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filename= eaysymb.prt |
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index= 1 |
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[lib2] |
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filename= newcrypto.prt |
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index= 1 |
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@endverbatim |
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@internalTechnology |
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@released |
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*/ |
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#include <e32base.h> |
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#include <es_prot.h> |
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#include "cryptospidef.h" |
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#include "cryptosymmetriccipherapi.h" |
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#include "cryptomacapi.h" |
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/** |
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// The protocol number for a library. |
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*/ |
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const TUint KProtocolCrypto = 0x104; |
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/** |
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// The protocol family for the library. |
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*/ |
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const TUint KAfCrypto = 0x0803; |
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typedef TBuf<0x20> TAlgorithmName; |
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/** |
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* @name Well Known Algorithm Names |
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* The cryptographic libary can choose the names for it's algorithms freely, |
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* but it will cause less confusion, if the well known standard algoriths |
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* are named uniformly. |
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*/ |
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//@{ |
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/** |
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* Single DES in CBC-Mode. |
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* - key: 8 |
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* - block: 8 |
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* - IV: 8 |
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*/ |
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_LIT(KIpsecName_DES_CBC, "descbc"); |
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/** |
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* Triple DES in CBC-Mode. |
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* - key: 24 |
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* - block: 8 |
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* - IV: 8 |
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*/ |
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_LIT(KIpsecName_3DES_CBC, "3descbc"); |
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/** |
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* Blowfish in CBC-Mode. |
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* - key: variable in 8..72 |
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* - block: 8 |
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* - IV: 8 |
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*/ |
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_LIT(KIpsecName_BLOWFISH_CBC, "blowfish"); |
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/** |
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* IDEA in CBC-Mode. |
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* - key: 16 |
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* - block: 8 |
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* - IV: 8 |
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*/ |
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_LIT(KIpsecName_IDEA_CBC, "idea"); |
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/** |
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* AES in CBC-Mode. |
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* - key: 16, 24 or 32 |
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* - block: 16 |
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* - IV: 16 |
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*/ |
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_LIT(KIpsecName_AES_CBC, "aescbc"); |
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/** |
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* AES in CTR-Mode. |
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* - key 16, 24 or 32 (+ append 4 octets for the NONCE) |
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* - block: 16 |
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* - IV: 8 |
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*/ |
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_LIT(KIpsecName_AES_CTR, "aesctr"); |
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/** |
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* RC5 in CBC-Mode. |
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* - key: variable 5..255 |
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* - block: 8 |
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* - IV: 8 |
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*/ |
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_LIT(KIpsecName_RC5, "rc5"); |
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/** |
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* SHA1 Digest. |
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* - digest length: 20 |
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* - block: 64 |
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*/ |
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_LIT(KIpsecName_SHA1, "sha1"); |
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/** |
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* SHA2-256 Digest. |
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* - digest length: 32 |
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* - block: 64 |
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*/ |
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_LIT(KIpsecName_SHA2_256, "sha2-256"); |
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/** |
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* MD5 Digest. |
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* - digest length: 16 |
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* - block: 64 |
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*/ |
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_LIT(KIpsecName_MD5, "md5"); |
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/** |
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* |
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* |
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*/ |
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#ifdef SYMBIAN_IPSEC_VOIP_SUPPORT |
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_LIT(KIpsecName_AES_XCBC_MAC, "aesxcbcmac") ; |
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#endif //SYMBIAN_IPSEC_VOIP_SUPPORT |
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//@} |
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|
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typedef enum |
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{ |
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EAlgorithmClass_Digest, //< Message Digest algorithm |
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EAlgorithmClass_Cipher, //< Symmetric Cipher algorithm |
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#ifdef SYMBIAN_IPSEC_VOIP_SUPPORT |
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EAlgorithmClass_Mac , |
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#endif //SYMBIAN_IPSEC_VOIP_SUPPORT |
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// |
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// New types are possible by adding the symbol here |
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// and defining the corresponding abstract class |
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// (similar to CMessageDigestCrypto and CSymmetricCipher) |
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// |
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} TAlgorithmClass; |
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|
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// TAlgorithmDesc (and related types) |
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/** |
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// A description of available algorithm. |
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// |
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// Similar to ProtocolList, a protocol supporting this API must |
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// return a description of each implemented algorithm as an |
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// array of TAlgorithmDesc objects as a result of AlgorithmList |
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// call. |
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*/ |
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class TAlgorithmDesc |
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{ |
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public: |
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TAlgorithmName iName; //< Name of the algorithm |
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TAlgorithmClass iAlgType; //< Class of the algorithm (cipher/digest) |
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TUint iMinBits; //< Min Length of the key in bits (all keys total) |
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TUint iMaxBits; //< Max Length of the key in bits (all keys total) |
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TUint iBlock; //< Length of the block in bytes |
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TUint iVector; //< Initialization Vector length (bytes) |
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}; |
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|
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// Each of the following includes virtual destructor |
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// just in case there is a need for a cleanup code |
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// when the object is deleted using a pointer to |
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// the base virtual class. |
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|
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// CMessageDigestCrypto |
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// ******************** |
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/** |
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// Base Message Digest (abstract) class. |
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// |
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// All message digest algorithms must be derived from this |
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// base class, which defines the IPSEC required API for |
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// message digests (used by AH and ESP with authentication |
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// implementations). |
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// |
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// Because IPSEC needs to run digest for each packet |
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// independently, it is important that the implementation |
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// can reset the computation by Init() without needing |
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// to do any additional allocations. |
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*/ |
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class CMessageDigestCrypto : public CBase |
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{ |
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// NOTE: This class was originally designed based on assumption |
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// that the derived class implementing the digest includes all |
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// state in member variables and does not need to allocate |
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// additional space -- thus no ConstructL method. |
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public: |
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/** |
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// Set digest into initial state. |
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// |
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// IPSEC calls this method to start a new digest |
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// computation for each IP packet that needs |
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// digest computation. |
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*/ |
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virtual void Init()=0; |
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/** |
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// Add segment of data to the digest. |
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// |
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// The octets in aMessage must be added to the digest |
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// value. The length of the aMessage can be anything |
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// from 0 or more octets. If the digest algorithm has |
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// any inherent block requirements, then this method |
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// must handle it (specifically, the digest must work |
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// correctly, even if the data is fed to it one byte |
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// at time). |
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// |
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// @param aMessage |
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// describe the segment of octets to be added into |
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// the digest (length >= 0). |
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*/ |
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virtual void Update(const TDesC8& aMessage)=0; |
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/** |
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// Wrap up the digest and return the result. |
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// |
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// @param aDigest |
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// a buffer to return the final computed digest value. |
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*/ |
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virtual void Final(TDes8& aDigest)=0; |
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virtual ~CMessageDigestCrypto() {} |
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}; |
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|
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#ifdef SYMBIAN_IPSEC_VOIP_SUPPORT |
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class CMacCrypto : public CBase |
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{ |
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public: |
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/** |
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// Set digest into initial state. |
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// |
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// IPSEC calls this method to start a new digest |
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// computation for each IP packet that needs |
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// digest computation. |
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*/ |
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virtual void Init()=0; |
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/** |
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// Add segment of data to the digest. |
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// |
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// The octets in aMessage must be added to the digest |
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// value. The length of the aMessage can be anything |
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// from 0 or more octets. If the digest algorithm has |
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// any inherent block requirements, then this method |
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// must handle it (specifically, the digest must work |
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// correctly, even if the data is fed to it one byte |
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// at time). |
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// |
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// @param aMessage |
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// describe the segment of octets to be added into |
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// the digest (length >= 0). |
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*/ |
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virtual void Update(const TDesC8& aMessage)=0; |
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/** |
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// Wrap up the digest and return the result. |
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// |
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// @param aDigest |
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// a buffer to return the final computed digest value. |
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*/ |
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virtual void Final(TDes8& aDigest)=0; |
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virtual ~CMacCrypto() {} |
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}; |
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#endif //SYMBIAN_IPSEC_VOIP_SUPPORT |
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|
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// CSymmetricCipher |
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// **************** |
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/** |
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// Base Symmetric Cipher (abstract) class. |
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// |
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// All cipher algorithms must be derived from this |
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// base class, which defines the IPSEC required API for |
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// cipher algorithms (used by ESP implementation). |
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328 |
// |
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// Because IPSEC needs to run cipher for each packet |
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// independently, it is important that the implementation |
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// can reset the computation by InitL() without needing |
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// to do any additional allocations [which means that |
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// it being a leaving function is a bad sign!] |
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*/ |
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class CSymmetricCipher : public CBase |
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{ |
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337 |
public: |
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enum TAction { EEncrypt, EDecrypt }; |
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339 |
/** |
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// Define the cipher key. |
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341 |
// |
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// Because setting the key can be time consuming, |
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// this is only called once after instantiation of the |
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// class. Then, each packet is started with a call |
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// to InitL. |
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346 |
// |
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// @param aKey |
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// the cipher key. The length of the key is |
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// defined by the length of this descriptor, |
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// and is always multiple of 8 bits. |
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// @return |
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// @li > 0, the key is weak (but set anyway) |
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// @li = 0, all ok |
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// @li < 0, the key not usable (not set) |
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*/ |
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virtual TInt Setkey(const TDesC8& aKey)=0; |
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357 |
/** |
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// Reset the cipher engine to initial state. |
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359 |
// |
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360 |
// As this method is called for each packet, it |
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// should not do any memory allocation or heavy |
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// computations. |
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363 |
// |
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// @param aIV initial vector. |
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// @param aMode tells whether initialize is for decrypt or encrypt. |
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366 |
*/ |
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virtual void Init(const TDesC8 &aIV, TAction aMode)=0; |
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368 |
/** |
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369 |
// Perform encryption or decryption. |
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370 |
// |
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371 |
// Because algorithms are expected to work blocks, the |
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// caller will guarantee that ALL Outbuf's given to Update |
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// will exist up to Finish call (or at least as long as at |
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// least blocksize octets have been given to Update after it). |
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// The implementation of the algorithm can store pointer(s) to |
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// aOutbuf described memory area, and return data to such |
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// memory area on some later Update or Finish call. |
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378 |
// |
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379 |
// The lengths of buffers are always equal, e.g. aInbuf.Length() |
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// octets will always fit into aOutbuf. This length can be anything |
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// from zero upwards. The cipher must work even if octets were |
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// fed to it one by one. |
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383 |
// |
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// @param aOutbuf result of the decrypt/encrypt |
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// @param aInbuf input to decrypt/encrypt |
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386 |
*/ |
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387 |
virtual void Update(TDes8& aOutbuf,const TDesC8& aInbuf)=0; |
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388 |
/** |
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389 |
// Finish encryption or decryption. |
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390 |
// |
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391 |
// Calling Finish is optional, it is needed if the total |
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392 |
// bytes is not multiple of the blocksize, or if one wants |
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// to get the final IV. |
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394 |
// |
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395 |
// IPSEC does use the final IV. |
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396 |
// |
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397 |
// @param aIV the place to return the final IV. |
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398 |
*/ |
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399 |
virtual void Finish(TDes8& aIV)=0; |
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virtual ~CSymmetricCipher() {} |
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401 |
}; |
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402 |
|
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403 |
// CProtocolCrypto |
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404 |
// *************** |
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405 |
/** |
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406 |
// Base class of the protocol implementing an algorithm library as a protocol |
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407 |
// |
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408 |
// All algorithm libraries must be derived from this base class. |
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409 |
*/ |
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class CProtocolCrypto : public CProtocolBase |
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411 |
{ |
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412 |
public: |
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413 |
/** |
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414 |
// Return the list of supported algorithms. |
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415 |
// |
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416 |
// IPSEC calls this method once during the binding |
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// process to find out the algorithms that are supported |
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// by this library. |
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419 |
// |
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420 |
// @retval aList |
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// a pointer to a new allocated array of TAlgorithmDesc. |
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// This array contains the descriptions of the supported |
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// algorithms. Can also return NULL, if not algorithms |
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// are supported at this point. The calling IPSEC will |
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// release this array, when it is not needed. |
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426 |
// |
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427 |
// @returns |
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// the length of the the array. May also return <= 0, |
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429 |
// in which case IPSEC will not be using any algorithms |
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// from this library. |
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*/ |
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virtual TUint AlgorithmList(TAlgorithmDesc *&aList) = 0; |
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/** |
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// Create an instance of cipher algorithm |
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// |
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// When IPSEC requires a use of specific algorithm, it |
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// asks a new instance of the algorithm by calling this |
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// method. |
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// |
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// @param aAlg |
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// index of the algorithm in the array of descriptions |
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// that was returned by the AlgorithmList(). |
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// |
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// @param aKey - The key value to be used in the encryption/decryption operation |
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// @return |
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// @li NULL, if algorithm could not be instantiated |
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// @li non-NULL (= new algorithm engine instance), if algorithm instantiated |
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*/ |
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virtual CryptoSpi::CSymmetricCipher* SymmetricCipherL(TUint aAlg, const TDesC8 &aKey)=0; |
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#ifdef SYMBIAN_IPSEC_VOIP_SUPPORT |
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virtual CryptoSpi::CMac* GetMacImplementationL(const TDesC8& aKey)=0; |
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#endif |
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/** |
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// Create an instance of digest algorithm |
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// |
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// When IPSEC requires a use of specific algorithm, it |
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// asks a new instance of the algorithm by calling this |
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// method. |
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// |
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// @param aAlg |
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// index of the algorithm in the array of descriptions |
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// that was returned by the AlgorithmList(). |
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// |
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// @return |
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// @li NULL, if algorithm could not be instantiated |
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// @li non-NULL (= new algorithm engine instance), if algorithm instantiated |
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*/ |
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virtual CMessageDigestCrypto* MessageDigest(TUint aAlg)=0; |
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protected: |
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virtual ~CProtocolCrypto() {} |
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}; |
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|
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#endif |