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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