/* * 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. */ // // context - manage CSSM (cryptographic) contexts every which way // #ifndef _H_CSSMCONTEXT #define _H_CSSMCONTEXT #include "cssmint.h" #include "cspattachment.h" #include <Security/context.h> #ifdef _CPP_CSSMCONTEXT # pragma export on #endif // // A HandleContext adds handle semantics to the Context object. // Note that not every Context is a HandleContext - the Contexts we hand // to our API customers for fondling are not. Also note that a HandleContext // not a PODWrapper. // HandleContext has an allocation method taking a CssmAllocator. To destroy // a HandleObject, call HandleObject::destroy(the-context, the-allocator). // You are responsible for picking the same allocator used on construction. // // THREADS: HandleContexts are assumed to have single-thread use. That means that // operations on HandleContexts are NOT interlocked automatically; two users of // the same context must do any arbitration themselves. A HandleContext is howerver // safely interlocked against other objects, in particular its CSPAttachment. // The upshot is that you're safe using a HandleContext unless someone else is trying // to use the same context in parallel. // class HandleContext : public HandleObject, public Context { public: HandleContext(CSPAttachment &attach, CSSM_CONTEXT_TYPE type, CSSM_ALGORITHMS algorithmId) : Context(type, algorithmId), attachment(attach), extent(0) { } virtual ~HandleContext(); CSPAttachment &attachment; void mergeAttributes(const CSSM_CONTEXT_ATTRIBUTE *attributes, uint32 count); CSSM_RETURN validateChange(CSSM_CONTEXT_EVENT event); void *operator new (size_t size, CssmAllocator &alloc) { return alloc.malloc(size); } void operator delete (void *addr, size_t, CssmAllocator &alloc) { return alloc.free(addr); } static void destroy(HandleContext *context, CssmAllocator &alloc) { context->~HandleContext(); alloc.free(context); } class Maker; // deluxe builder protected: // Locking protocol, courtesy of HandleObject. // This locks the underlying attachment. void lock(); bool tryLock(); private: void *extent; // extra storage extent in use }; inline HandleContext &enterContext(CSSM_CC_HANDLE h) { return findHandleAndLock<HandleContext>(h, CSSM_ERRCODE_INVALID_CONTEXT_HANDLE); } // // A Maker is a deluxe wrapper around Builder. It creates whole HandleContext // objects in one swell foop, handling object locking, construction, error // recovery, and all that jazz. A Maker cannot create plain Context objects. // class HandleContext::Maker : public Context::Builder { public: Maker(CSSM_CSP_HANDLE handle) : Context::Builder(findHandleAndLock<CSPAttachment>(handle, CSSM_ERRCODE_INVALID_CSP_HANDLE)), attachment(static_cast<CSPAttachment &>(allocator)), // order dependency(!) locker(attachment, true) { attachment.finishEnter(); } CSPAttachment &attachment; CSSM_CC_HANDLE operator () (CSSM_CONTEXT_TYPE type, CSSM_ALGORITHMS algorithm); private: StLock<CountingMutex, &CountingMutex::enter, &CountingMutex::exit> locker; }; #endif //_H_CSSMCONTEXT