libsecurity_apple_csp/lib/ascContext.h

   1 /*
   2  * ascContext.h - glue between BlockCrytpor and ComCryption (a.k.a. Apple
   3  *                                Secure Compression).
   4  * Written by Doug Mitchell 4/4/2001
   5  */
   6
   7 #ifdef  ASC_CSP_ENABLE
   8
   9 #ifndef _ASC_CONTEXT_H_
  10 #define _ASC_CONTEXT_H_
  11
  12 #include "AppleCSPContext.h"
  13 #include <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.h>
  14 #include <security_comcryption/comcryption.h>
  15
  16 /* symmetric encrypt/decrypt context */
  17 class ASCContext : public AppleCSPContext {
  18 public:
  19         ASCContext(AppleCSPSession &session) :
  20                 AppleCSPContext(session),
  21                 mCcObj(NULL)    { }
  22         ~ASCContext();
  23
  24         // called by CSPFullPluginSession
  25         void init(
  26                 const Context   &context,
  27                 bool encoding = true);
  28         void update(
  29                 void                    *inp,
  30                 size_t                  &inSize,                        // in/out
  31                 void                    *outp,
  32                 size_t                  &outSize);                      // in/out
  33         void final(
  34                 CssmData                &out);
  35
  36         size_t inputSize(
  37                 size_t                  outSize);                       // input for given output size
  38         size_t outputSize(
  39                 bool                    final = false,
  40                 size_t                  inSize = 0);            // output for given input size
  41         void minimumProgress(
  42                 size_t                  &in,
  43                 size_t                  &out);                          // minimum progress chunks
  44
  45 private:
  46         comcryptObj                     mCcObj;
  47
  48         /*
  49          * For first implementation, we have to cope with the fact that the final
  50          * decrypt call down to the comcryption engine requires *some* ciphertext.
  51          * On decrypt, we'll just save one byte on each update in preparation for
  52          * the final call. Hopefull we'll have time to fix deComcryptData() so this
  53          * is unneccesary.
  54          */
  55         unsigned char           mDecryptBuf;
  56         bool                            mDecryptBufValid;
  57
  58 };      /* RC4Context */
  59
  60 #endif  /*_ASC_CONTEXT_H_ */
  61 #endif  /* ASC_CSP_ENABLE */