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/*
//
//  Purpose:
//     Cryptography Primitive.
//     Internal Definitions of SSE Montgomery Exp
//
*/
#include "owncp.h"

#if (_IPP>=_IPP_W7)

#include "pcpbnuimpl.h"
#include "pcpngmontexpstuff.h"

#define RSA_SSE2_MIN_BITSIZE  (256)
#define RSA_SSE2_MAX_BITSIZE  (13*1024)

#define NORM_DIGSIZE_SSE2 (BITSIZE(Ipp32u))
#define NORM_BASE_SSE2   ((Ipp64u)1<<NORM_DIGSIZE_SSE2)
#define NORM_MASK_SSE2 (NORM_BASE_SSE2-1)

#define EXP_DIGIT_SIZE_SSE2   (27)
#define EXP_DIGIT_BASE_SSE2   (1<<EXP_DIGIT_SIZE_SSE2)
#define EXP_DIGIT_MASK_SSE2   (EXP_DIGIT_BASE_SSE2-1)


/* number of "diSize" chunks in "bitSize" bit string */
__INLINE int cpDigitNum_sse2(int bitSize, int digSize)
{ return (bitSize + digSize-1)/digSize; }

/* number of "RSA_SSE2_DIGIT_SIZE" chunks in "bitSize" bit string matched for AMM */
__INLINE cpSize numofVariable_sse2(int modulusBits)
{
   cpSize ammBitSize = 2 + cpDigitNum_sse2(modulusBits, BITSIZE(BNU_CHUNK_T)) * BITSIZE(BNU_CHUNK_T);
   cpSize redNum = cpDigitNum_sse2(ammBitSize, EXP_DIGIT_SIZE_SSE2);
   return redNum;
}

/* buffer corresponding to numofVariable_sse2() */
__INLINE cpSize numofVariableBuff_sse2(int numV)
{
   return numV +4 +(numV&1);
}

/* exponentiation buffer size */
#define gsMontExpBinBuffer_sse2 OWNAPI(gsMontExpBinBuffer_sse2)
#define gsMontExpWinBuffer_sse2 OWNAPI(gsMontExpWinBuffer_sse2)
cpSize  gsMontExpBinBuffer_sse2(int modulusBits);
cpSize  gsMontExpWinBuffer_sse2(int modulusBits);

/* exponentiations */
#define gsMontExpBin_BNU_sse2 OWNAPI(gsMontExpBin_BNU_sse2)
cpSize  gsMontExpBin_BNU_sse2(BNU_CHUNK_T* dataY,
                        const BNU_CHUNK_T* dataX, cpSize nsX,
                        const BNU_CHUNK_T* dataE, cpSize nsE,
                              gsModEngine* pMont,
                              BNU_CHUNK_T* pBufferT);

#define gsMontExpBin_BNU_sscm_sse2 OWNAPI(gsMontExpBin_BNU_sscm_sse2)
cpSize  gsMontExpBin_BNU_sscm_sse2(BNU_CHUNK_T* dataY,
                        const BNU_CHUNK_T* dataX, cpSize nsX,
                        const BNU_CHUNK_T* dataE, cpSize nsE,
                              gsModEngine* pMont,
                              BNU_CHUNK_T* pBufferT);

#define gsMontExpWin_BNU_sse2 OWNAPI(gsMontExpWin_BNU_sse2)
cpSize  gsMontExpWin_BNU_sse2(BNU_CHUNK_T* dataY,
                             const BNU_CHUNK_T* dataX, cpSize nsX,
                             const BNU_CHUNK_T* dataE, cpSize nsE,
                                   gsModEngine* pMont,
                                   BNU_CHUNK_T* pBufferT);

#define gsMontExpWin_BNU_sscm_sse2 OWNAPI(gsMontExpWin_BNU_sscm_sse2)
cpSize  gsMontExpWin_BNU_sscm_sse2(BNU_CHUNK_T* dataY,
                             const BNU_CHUNK_T* dataX, cpSize nsX,
                             const BNU_CHUNK_T* dataE, cpSize nsE,
                                   gsModEngine* pMont,
                                   BNU_CHUNK_T* pBuffer);

#endif /* _IPP_W7 */