X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/Security/libsecurity_apple_csp/lib/castContext.h?ds=inline

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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.
+ */
+
+
+/*
+ * castContext.h - glue between BlockCrytpor and ssleay CAST-128 (CAST5)
+ *				 implementation
+ *
+ *
+ * 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 <CommonCrypto/CommonCryptor.h>
+#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_