OSX/libsecurity_apple_csp/lib/ascContext.h

   1 /*
   2  * Copyright (c) 2001,2011,2013-2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 #ifdef  ASC_CSP_ENABLE
  26
  27 #ifndef _ASC_CONTEXT_H_
  28 #define _ASC_CONTEXT_H_
  29
  30 #include "AppleCSPContext.h"
  31 #include <security_comcryption/comcryption.h>
  32
  33 /* symmetric encrypt/decrypt context */
  34 class ASCContext : public AppleCSPContext {
  35 public:
  36         ASCContext(AppleCSPSession &session) :
  37                 AppleCSPContext(session),
  38                 mCcObj(NULL)    { }
  39         ~ASCContext();
  40
  41         // called by CSPFullPluginSession
  42         void init(
  43                 const Context   &context,
  44                 bool encoding = true);
  45         void update(
  46                 void                    *inp,
  47                 size_t                  &inSize,                        // in/out
  48                 void                    *outp,
  49                 size_t                  &outSize);                      // in/out
  50         void final(
  51                 CssmData                &out);
  52
  53         size_t inputSize(
  54                 size_t                  outSize);                       // input for given output size
  55         size_t outputSize(
  56                 bool                    final = false,
  57                 size_t                  inSize = 0);            // output for given input size
  58         void minimumProgress(
  59                 size_t                  &in,
  60                 size_t                  &out);                          // minimum progress chunks
  61
  62 private:
  63         comcryptObj                     mCcObj;
  64
  65         /*
  66          * For first implementation, we have to cope with the fact that the final
  67          * decrypt call down to the comcryption engine requires *some* ciphertext.
  68          * On decrypt, we'll just save one byte on each update in preparation for
  69          * the final call. Hopefull we'll have time to fix deComcryptData() so this
  70          * is unneccesary.
  71          */
  72         unsigned char           mDecryptBuf;
  73         bool                            mDecryptBufValid;
  74
  75 };      /* RC4Context */
  76
  77 #endif  /*_ASC_CONTEXT_H_ */
  78 #endif  /* ASC_CSP_ENABLE */