/* * 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. */ /* * castContext.h - glue between BlockCrytpor and ssleay CAST-128 (CAST5) * implementation * * Written by Doug Mitchell 4/24/2003 * * Here's what RFC 2144 has to say about CAST128 and CAST5 nomenclature: * * In order to avoid confusion when variable keysize operation is * used, the name CAST-128 is to be considered synonymous with the * name CAST5; this allows a keysize to be appended without ambiguity. * Thus, for example, CAST-128 with a 40-bit key is to be referred to * as CAST5-40; where a 128-bit key is explicitly intended, the * name CAST5-128 should be used. * * This module implements a variable key length, from 40 bits to 128 bits, * and can thus be said to implement both CAST-128 and CAST5. */ #ifndef _CAST_CONTEXT_H_ #define _CAST_CONTEXT_H_ #include "AppleCSPContext.h" #include "BlockCryptor.h" #include <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.h> #include <CommonCrypto/CommonCryptor.h> #include "/usr/local/include/CommonCrypto/CommonCryptorSPI.h" class CastContext : public BlockCryptor { public: CastContext(AppleCSPSession &session); virtual ~CastContext(); // 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) size_t cipherTextLen, void *plainText, size_t &plainTextLen, // in/out, throws on overflow bool final); private: void deleteKey(); /* scheduled key */ CCCryptorRef mCastKey; bool mInitFlag; // for easy reuse /* * Raw key bits saved here and checked on re-init to avoid * extra key schedule */ uint8 mRawKey[kCCKeySizeMaxCAST]; uint32 mRawKeySize; }; /* CastContext */ #endif //_CAST_CONTEXT_H_