X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/Security/libsecurity_apple_csp/lib/bfContext.h

diff --git a/Security/libsecurity_apple_csp/lib/bfContext.h b/Security/libsecurity_apple_csp/lib/bfContext.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.
+ */
+
+
+/*
+ * bfContext.h - glue between BlockCrytpor and ssleay Blowfish
+ *				 implementation
+ */
+ 
+#ifndef _BF_CONTEXT_H_
+#define _BF_CONTEXT_H_
+
+#include "AppleCSPContext.h"
+#include "BlockCryptor.h"
+#include <openssl/blowfish.h>
+
+class BlowfishContext : public BlockCryptor {
+public:
+	BlowfishContext(AppleCSPSession &session) :
+		BlockCryptor(session),
+		mInitFlag(false),
+		mRawKeySize(0)	{ }
+	~BlowfishContext();
+	
+	// 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 */
+	BF_KEY				mBfKey;
+	bool				mInitFlag;			// for easy reuse
+
+	/* 
+	 * Raw key bits saved here and checked on re-init to avoid 
+	 * extra key schedule 
+	 */
+	uint8				mRawKey[BF_MAX_KEY_SIZE_BYTES];
+	uint32				mRawKeySize;
+
+	
+};	/* BlowfishContext */
+
+#endif //_BF_CONTEXT_H_