Security-57031.1.35.tar.gz

[apple/security.git] / 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_