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     40 
     41 /*
     42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
     43 //     Operations over GF(p) ectension.
     44 //
     45 //     Context:
     46 //        pcpgfpxinitbinomial.c()
     47 //
     48 */
     49 
     50 #include "owndefs.h"
     51 #include "owncp.h"
     52 #include "pcpgfpstuff.h"
     53 #include "pcpgfpxstuff.h"
     54 #include "pcptool.h"
     55 
     56 
     57 /*F*
     58 // Name: ippsGFpxInitBinomial
     59 //
     60 // Purpose: initializes finite field extension GF(p^d)
     61 //
     62 // Returns:                   Reason:
     63 //    ippStsNullPtrErr           NULL == pGFpx
     64 //                               NULL == pGroundGF
     65 //                               NULL == pGroundElm
     66 //                               NULL == pGFpMethod
     67 //
     68 //    ippStsContextMatchErr      incorrect pGroundGF's context ID
     69 //                               incorrect pGroundElm's context ID
     70 //
     71 //    ippStsOutOfRangeErr        size of pGroundElm does not equal to size of pGroundGF element
     72 //
     73 //    ippStsBadArgErr            IPP_MIN_GF_EXTDEG > extDeg || extDeg > IPP_MAX_GF_EXTDEG
     74 //                                  (IPP_MIN_GF_EXTDEG==2, IPP_MAX_GF_EXTDEG==8)
     75 //
     76 //                               cpID_Poly!=pGFpMethod->modulusID  -- method does not refferenced to polynomial one
     77 //                               pGFpMethod->modulusBitDeg!=extDeg -- fixed method does not match to degree extension
     78 //
     79 //    ippStsNoErr                no error
     80 //
     81 // Parameters:
     82 //    pGroundGF      pointer to the context of the finite field is being extension
     83 //    extDeg         degree of extension
     84 //    pGroundElm     pointer to the IppsGFpElement context containing the trailing coefficient of the field binomial.
     85 //    pGFpMethod     pointer to the basic arithmetic metods
     86 //    pGFpx          pointer to Finite Field context is being initialized
     87 *F*/
     88 IPPFUN(IppStatus, ippsGFpxInitBinomial,(const IppsGFpState* pGroundGF, int extDeg,
     89                                         const IppsGFpElement* pGroundElm,
     90                                         const IppsGFpMethod* pGFpMethod,
     91                                         IppsGFpState* pGFpx))
     92 {
     93    IPP_BAD_PTR4_RET(pGFpx, pGroundGF, pGroundElm, pGFpMethod);
     94 
     95    pGFpx = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFpx, GFP_ALIGNMENT) );
     96    pGroundGF = (IppsGFpState*)( IPP_ALIGNED_PTR(pGroundGF, GFP_ALIGNMENT) );
     97    IPP_BADARG_RET( !GFP_TEST_ID(pGroundGF), ippStsContextMatchErr );
     98 
     99    IPP_BADARG_RET( !GFPE_TEST_ID(pGroundElm), ippStsContextMatchErr );
    100    IPP_BADARG_RET(GFPE_ROOM(pGroundElm)!=GFP_FELEN(GFP_PMA(pGroundGF)), ippStsOutOfRangeErr);
    101 
    102    IPP_BADARG_RET( extDeg<IPP_MIN_GF_EXTDEG || extDeg>IPP_MAX_GF_EXTDEG, ippStsBadArgErr);
    103 
    104    /* test method is binomial based */
    105    IPP_BADARG_RET(cpID_Binom != (pGFpMethod->modulusID & cpID_Binom), ippStsBadArgErr);
    106 
    107    /* test if method assums fixed degree extension */
    108    IPP_BADARG_RET(pGFpMethod->modulusBitDeg && (extDeg!=pGFpMethod->modulusBitDeg), ippStsBadArgErr);
    109 
    110    /* init context */
    111    InitGFpxCtx(pGroundGF, extDeg, pGFpMethod, pGFpx);
    112 
    113    /* store low-order coefficient of irresucible into the context */
    114    cpGFpElementCopy(GFP_MODULUS(GFP_PMA(pGFpx)), GFPE_DATA(pGroundElm), GFP_FELEN(GFP_PMA(pGroundGF)));
    115 
    116    return ippStsNoErr;
    117 }
    118