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| |
| /* |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // Operations over GF(p) ectension. |
| // |
| // Context: |
| // pcpgfpxinitbinomial.c() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpgfpstuff.h" |
| #include "pcpgfpxstuff.h" |
| #include "pcptool.h" |
| |
| |
| /*F* |
| // Name: ippsGFpxInitBinomial |
| // |
| // Purpose: initializes finite field extension GF(p^d) |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr NULL == pGFpx |
| // NULL == pGroundGF |
| // NULL == pGroundElm |
| // NULL == pGFpMethod |
| // |
| // ippStsContextMatchErr incorrect pGroundGF's context ID |
| // incorrect pGroundElm's context ID |
| // |
| // ippStsOutOfRangeErr size of pGroundElm does not equal to size of pGroundGF element |
| // |
| // ippStsBadArgErr IPP_MIN_GF_EXTDEG > extDeg || extDeg > IPP_MAX_GF_EXTDEG |
| // (IPP_MIN_GF_EXTDEG==2, IPP_MAX_GF_EXTDEG==8) |
| // |
| // cpID_Poly!=pGFpMethod->modulusID -- method does not refferenced to polynomial one |
| // pGFpMethod->modulusBitDeg!=extDeg -- fixed method does not match to degree extension |
| // |
| // ippStsNoErr no error |
| // |
| // Parameters: |
| // pGroundGF pointer to the context of the finite field is being extension |
| // extDeg degree of extension |
| // pGroundElm pointer to the IppsGFpElement context containing the trailing coefficient of the field binomial. |
| // pGFpMethod pointer to the basic arithmetic metods |
| // pGFpx pointer to Finite Field context is being initialized |
| *F*/ |
| IPPFUN(IppStatus, ippsGFpxInitBinomial,(const IppsGFpState* pGroundGF, int extDeg, |
| const IppsGFpElement* pGroundElm, |
| const IppsGFpMethod* pGFpMethod, |
| IppsGFpState* pGFpx)) |
| { |
| IPP_BAD_PTR4_RET(pGFpx, pGroundGF, pGroundElm, pGFpMethod); |
| |
| pGFpx = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFpx, GFP_ALIGNMENT) ); |
| pGroundGF = (IppsGFpState*)( IPP_ALIGNED_PTR(pGroundGF, GFP_ALIGNMENT) ); |
| IPP_BADARG_RET( !GFP_TEST_ID(pGroundGF), ippStsContextMatchErr ); |
| |
| IPP_BADARG_RET( !GFPE_TEST_ID(pGroundElm), ippStsContextMatchErr ); |
| IPP_BADARG_RET(GFPE_ROOM(pGroundElm)!=GFP_FELEN(GFP_PMA(pGroundGF)), ippStsOutOfRangeErr); |
| |
| IPP_BADARG_RET( extDeg<IPP_MIN_GF_EXTDEG || extDeg>IPP_MAX_GF_EXTDEG, ippStsBadArgErr); |
| |
| /* test method is binomial based */ |
| IPP_BADARG_RET(cpID_Binom != (pGFpMethod->modulusID & cpID_Binom), ippStsBadArgErr); |
| |
| /* test if method assums fixed degree extension */ |
| IPP_BADARG_RET(pGFpMethod->modulusBitDeg && (extDeg!=pGFpMethod->modulusBitDeg), ippStsBadArgErr); |
| |
| /* init context */ |
| InitGFpxCtx(pGroundGF, extDeg, pGFpMethod, pGFpx); |
| |
| /* store low-order coefficient of irresucible into the context */ |
| cpGFpElementCopy(GFP_MODULUS(GFP_PMA(pGFpx)), GFPE_DATA(pGroundElm), GFP_FELEN(GFP_PMA(pGroundGF))); |
| |
| return ippStsNoErr; |
| } |