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  /* 
  //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
  //     Operations over GF(p).
  // 
  //     Context:
  //        ippsGFpIsUnityElement()
  // 
  */
  #include "owndefs.h"
  #include "owncp.h"
  
  #include "pcpgfpstuff.h"
  #include "pcpgfpxstuff.h"
  #include "pcptool.h"
  
  
  /*F*
  // Name: ippsGFpIsUnityElement
  //
  // Purpose: Compare GF Element with unity element
  //
  // Returns:                   Reason:
  //    ippStsNullPtrErr           NULL == pGFp
  //                               NULL == pA
  //                               NULL == pResult
  //
  //    ippStsContextMatchErr      invalid pGFp->idCtx
  //                               invalid pA->idCtx
  //
  //    ippStsOutOfRangeErr        GFPE_ROOM() != GFP_FELEN()
  //
  //    ippStsNoErr                no error
  //
  // Parameters:
  //    pA         Pointer to the context of the finite field element.
  //    pResult    Pointer to the result of the comparison
  //    pGFp       Pointer to the context of the finite field.
  //
  *F*/
  
  IPPFUN(IppStatus, ippsGFpIsUnityElement,(const IppsGFpElement* pA,
                                       int* pResult,
                                       const IppsGFpState* pGFp))
  {
     IPP_BAD_PTR3_RET(pA, pResult, pGFp);
     pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
     IPP_BADARG_RET( !GFP_TEST_ID(pGFp), ippStsContextMatchErr );
     IPP_BADARG_RET( !GFPE_TEST_ID(pA), ippStsContextMatchErr );
     {
        gsModEngine* pGFE = GFP_PMA(pGFp);
        IPP_BADARG_RET( GFPE_ROOM(pA)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
        {
           gsModEngine* pBasicGFE = cpGFpBasic(pGFE);
           int basicElmLen = GFP_FELEN(pBasicGFE);
           BNU_CHUNK_T* pUnity = GFP_MNT_R(pBasicGFE);
  
           int elmLen = GFP_FELEN(pGFE);
           int flag;
  
           FIX_BNU(pUnity, basicElmLen);
           FIX_BNU(GFPE_DATA(pA), elmLen);
  
           flag = (basicElmLen==elmLen) && (0 == cpGFpElementCmp(GFPE_DATA(pA), pUnity, elmLen));
           *pResult = (1==flag)? IPP_IS_EQ : IPP_IS_NE;
           return ippStsNoErr;
        }
     }
  }
  