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 <security_comcryption/comcryption.h>
  14
  15 /* symmetric encrypt/decrypt context */
  16 class ASCContext : public AppleCSPContext {
  17 public:
  18         ASCContext(AppleCSPSession &session) :
  19                 AppleCSPContext(session),
  20                 mCcObj(NULL)    { }
  21         ~ASCContext();
  22
  23         // called by CSPFullPluginSession
  24         void init(
  25                 const Context   &context,
  26                 bool encoding = true);
  27         void update(
  28                 void                    *inp,
  29                 size_t                  &inSize,                        // in/out
  30                 void                    *outp,
  31                 size_t                  &outSize);                      // in/out
  32         void final(
  33                 CssmData                &out);
  34
  35         size_t inputSize(
  36                 size_t                  outSize);                       // input for given output size
  37         size_t outputSize(
  38                 bool                    final = false,
  39                 size_t                  inSize = 0);            // output for given input size
  40         void minimumProgress(
  41                 size_t                  &in,
  42                 size_t                  &out);                          // minimum progress chunks
  43
  44 private:
  45         comcryptObj                     mCcObj;
  46
  47         /*
  48          * For first implementation, we have to cope with the fact that the final
  49          * decrypt call down to the comcryption engine requires *some* ciphertext.
  50          * On decrypt, we'll just save one byte on each update in preparation for
  51          * the final call. Hopefull we'll have time to fix deComcryptData() so this
  52          * is unneccesary.
  53          */
  54         unsigned char           mDecryptBuf;
  55         bool                            mDecryptBufValid;
  56
  57 };      /* RC4Context */
  58
  59 #endif  /*_ASC_CONTEXT_H_ */
  60 #endif  /* ASC_CSP_ENABLE */