/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ // // gladmanContext.h - Gladman AES context class // #ifndef _H_GLADMAN_CONTEXT #define _H_GLADMAN_CONTEXT #include <Security/CSPsession.h> #include "AppleCSP.h" #include "AppleCSPContext.h" #include "AppleCSPSession.h" #include "BlockCryptor.h" #include "rijndaelGladman.h" #include "aesCommon.h" #define GLADMAN_BLOCK_SIZE_BYTES DEFAULT_AES_BLOCK_BYTES /* Symmetric encryption context */ class GAESContext : public BlockCryptor { public: GAESContext(AppleCSPSession &session); ~GAESContext(); // called by CSPFullPluginSession void init(const Context &context, bool encoding = true); // As an optimization, we allow reuse of a modified context. The main thing // we avoid is a redundant key scheduling. We save the current raw keys bits // in mRawKey and compare on re-init. bool changed(const Context &context) { return true; } // called by BlockCryptor void encryptBlock( const void *plainText, // length implied (one block) size_t plainTextLen, void *cipherText, size_t &cipherTextLen, // in/out, throws on overflow bool final); void decryptBlock( const void *cipherText, // length implied (one cipher block) void *plainText, size_t &plainTextLen, // in/out, throws on overflow bool final); private: void deleteKey(); /* scheduled key */ GAesKey mAesKey; bool mKeyValid; bool mInitFlag; // for easy reuse /* raw key bits saved here and checked on re-init to avoid extra key schedule */ uint8 mRawKey[MAX_AES_KEY_BITS / 8]; uint32 mRawKeySize; }; /* AESContext */ #endif //_H_GLADMAN_CONTEXT