X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/5dd5f9ec28f304ca377c42fd7f711d6cf12b90e1..5c19dc3ae3bd8e40a9c028b0deddd50ff337692c:/OSX/libsecurity_apple_csp/lib/gladmanContext.h

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+/*
+ * Copyright (c) 2000-2001,2011,2013-2014 Apple 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_cdsa_plugin/CSPsession.h>
+#include "AppleCSP.h"
+#include "AppleCSPContext.h"
+#include "AppleCSPSession.h"
+#include "BlockCryptor.h"
+#include <CommonCrypto/CommonCryptor.h>
+#include <CommonCrypto/CommonCryptorSPI.h>
+#include "aesCommon.h"
+
+#define GLADMAN_BLOCK_SIZE_BYTES	DEFAULT_AES_BLOCK_BYTES
+
+/* Symmetric encryption context */
+class GAESContext : public BlockCryptor {
+public:
+	GAESContext(AppleCSPSession &session);
+	virtual ~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)
+		size_t			cipherTextLen,	
+		void			*plainText,	
+		size_t			&plainTextLen,		// in/out, throws on overflow
+		bool			final);
+	
+private:
+	void deleteKey();
+	
+	/* scheduled key */
+    CCCryptorRef	mAesKey;	
+	bool				mInitFlag;			// for easy reuse
+	
+	/* 
+	 * Raw key bits saved here and checked on re-init to avoid extra key 
+	 * schedule on re-init. We also have to do a new key schedule if 
+	 * changing between encrypting and decrypting since the key schedules
+	 * differ for the two.
+	 */
+	uint8				mRawKey[MAX_AES_KEY_BITS / 8];
+	uint32				mRawKeySize;
+	bool				mWasEncrypting;
+};	/* AESContext */
+
+#endif //_H_GLADMAN_CONTEXT