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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     AES-XTS Internal Definitions
// 
// 
*/

#if !defined(_PCP_AES_XTS_H)
#define _PCP_AES_XTS_H

#include "owncp.h"
#include "pcpaesm.h"

#define _NEW_XTS_API_3
#if defined (_NEW_XTS_API_3)
/*
// AES-XTS State
*/
#if !defined(AES_BLK_SIZE)
#define AES_BLK_SIZE (IPP_AES_BLOCK_BITSIZE/BITSIZE(Ipp8u))
#endif

#define AES_BLKS_PER_BUFFER (32)

struct _cpAES_XTS
{
   IppCtxId  idCtx;
   int       duBitsize;                   /* size of data unit (in bits) */
   __ALIGN16 IppsAESSpec datumAES;        /* datum AES context */
   __ALIGN16 IppsAESSpec tweakAES;        /* tweak AES context */
};

/* valid AES_XTS context ID */
#define VALID_AES_XTS_ID(ctx)   ((ctx)->idCtx==idCtxAESXTS)

/* size of AES-XTS context */
__INLINE int cpSizeof_AES_XTS_Ctx(void)
{
   return sizeof(IppsAES_XTSSpec) +(AES_ALIGNMENT-1);
}

static int IsLegalGeometry(int startCipherBlkNo, int bitLen, int duBitsize)
{
   int duBlocks = (duBitsize+IPP_AES_BLOCK_BITSIZE-1)/IPP_AES_BLOCK_BITSIZE;
   int legalBlk = (0<=startCipherBlkNo && startCipherBlkNo<duBlocks) && ((startCipherBlkNo*IPP_AES_BLOCK_BITSIZE+bitLen)<=duBitsize);
   int legalLen = 0;
   if(0 == duBitsize%IPP_AES_BLOCK_BITSIZE) {
      legalLen = (0 == bitLen%IPP_AES_BLOCK_BITSIZE);
   }
   else
      if(bitLen%IPP_AES_BLOCK_BITSIZE)
         legalLen = (startCipherBlkNo*IPP_AES_BLOCK_BITSIZE+bitLen == duBitsize);
   return legalBlk && legalLen;
}


#endif /* _NEW_XTS_API_ */

#endif /* _PCP_AES_XTS_H */