Security/libsecurity_apple_csp/lib/bfContext.h

   1 /*
   2  * Copyright (c) 2000-2001,2011,2013-2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /*
  20  * bfContext.h - glue between BlockCrytpor and ssleay Blowfish
  21  *                               implementation
  22  */
  23
  24 #ifndef _BF_CONTEXT_H_
  25 #define _BF_CONTEXT_H_
  26
  27 #include "AppleCSPContext.h"
  28 #include "BlockCryptor.h"
  29 #include <openssl/blowfish.h>
  30
  31 class BlowfishContext : public BlockCryptor {
  32 public:
  33         BlowfishContext(AppleCSPSession &session) :
  34                 BlockCryptor(session),
  35                 mInitFlag(false),
  36                 mRawKeySize(0)  { }
  37         ~BlowfishContext();
  38
  39         // called by CSPFullPluginSession
  40         void init(const Context &context, bool encoding = true);
  41
  42         // As an optimization, we allow reuse of a modified context.
  43         // The main thing we avoid is a redundant key scheduling. We
  44         // save the current raw keys bits in mRawKey and compare on
  45         // re-init.
  46         bool changed(const Context &context)     { return true; }
  47
  48         // called by BlockCryptor
  49         void encryptBlock(
  50                 const void              *plainText,             // length implied (one block)
  51                 size_t                  plainTextLen,
  52                 void                    *cipherText,
  53                 size_t                  &cipherTextLen, // in/out, throws on overflow
  54                 bool                    final);
  55         void decryptBlock(
  56                 const void              *cipherText,    // length implied (one cipher block)
  57                 size_t                  cipherTextLen,
  58                 void                    *plainText,
  59                 size_t                  &plainTextLen,  // in/out, throws on overflow
  60                 bool                    final);
  61
  62 private:
  63         void deleteKey();
  64
  65         /* scheduled key */
  66         BF_KEY                          mBfKey;
  67         bool                            mInitFlag;                      // for easy reuse
  68
  69         /*
  70          * Raw key bits saved here and checked on re-init to avoid
  71          * extra key schedule
  72          */
  73         uint8                           mRawKey[BF_MAX_KEY_SIZE_BYTES];
  74         uint32                          mRawKeySize;
  75
  76
  77 };      /* BlowfishContext */
  78
  79 #endif //_BF_CONTEXT_H_