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  /*
  //
  //  Purpose:
  //     Cryptography Primitive.
  //     RC4 Internal Definitions and Function Prototypes
  //
  */
  
  #if !defined(_ARCFOUR_H)
  #define _ARCFOUR_H
  #define _ARCFOUR_H
  
  #if ((_IPP==_IPP_W7) || (_IPP==_IPP_T7))
     #define rc4word   Ipp8u
  
  
  #elif ((_IPP>=_IPP_V8) || (_IPP32E>=_IPP32E_M7))
     #define rc4word   Ipp32u
  
  #else
     #define rc4word   Ipp8u
  #endif
  
  /*
  // ARCFOUR context
  */
  struct _cpARCfour {
     IppCtxId    idCtx;      /* RC4 identifier  */
  
     Ipp32u      cntX;       /* algorithm's counter x  */
     Ipp32u      cntY;       /* algorithm's counter y  */
     rc4word     Sbox[256];  /* current state block.*/
     Ipp8u       Sbox0[256]; /* initial state block */
  };
  
  /* alignment */
  #define RC4_ALIGNMENT ((int)(sizeof(Ipp32u)))
  
  /*
  // Useful macros
  */
  #define RC4_ID(ctx)        ((ctx)->idCtx)
  #define RC4_CNTX(ctx)      ((ctx)->cntX)
  #define RC4_CNTY(ctx)      ((ctx)->cntY)
  #define RC4_SBOX(ctx)      ((ctx)->Sbox)
  #define RC4_SBOX0(ctx)     ((ctx)->Sbox0)
  
  #define RC4_VALID_ID(ctx)  (RC4_ID((ctx))==idCtxARCFOUR)
  
  /*
  // internal functions
  */
  #define ARCFourProcessData OWNAPI(ARCFourProcessData)
     void ARCFourProcessData(const Ipp8u *pSrc, Ipp8u *pDst, int length, IppsARCFourState *pCtx);
  
  #endif /* _ARCFOUR_H */
  