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40 
41 /*
42 //
43 //  Purpose:
44 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
45 //     EC over GF(p) Operations
46 //
47 //     Context:
48 //        ippsGFpECPointGetSize()
49 //
50 */
51 
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpgfpecstuff.h"
55 #include "pcphash.h"
56 #include "pcphash_rmf.h"
57 
58 /*F*
59 // Name: ippsGFpECPointGetSize
60 //
61 // Purpose: Gets the size of the IppsGFpECPoint context
62 //
63 // Returns:                   Reason:
64 //    ippStsNullPtrErr          pEC == NULL
65 //                              pSize == NULL
66 //
67 //    ippStsContextMatchErr     invalid pEC->idCtx
68 //
69 //    ippStsNoErr               no error
70 //
71 // Parameters:
72 //    pEC             Pointer to the context of the elliptic curve
73 //    pSize           Pointer to the buffer size
74 //
75 *F*/
76 
77 IPPFUN(IppStatus, ippsGFpECPointGetSize,(const IppsGFpECState* pEC, int* pSize))
78 {
79    IPP_BAD_PTR2_RET(pEC, pSize);
80    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
81    IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
82 
83    {
84       int elemLen = GFP_FELEN(GFP_PMA(ECP_GFP(pEC)));
85       *pSize = sizeof(IppsGFpECPoint)
86                      +elemLen*sizeof(BNU_CHUNK_T) /* X */
87                      +elemLen*sizeof(BNU_CHUNK_T) /* Y */
88                      +elemLen*sizeof(BNU_CHUNK_T);/* Z */
89       return ippStsNoErr;
90    }
91 }
92 
93 /*F*
94 // Name: ippsGFpECPointInit
95 //
96 // Purpose: Initializes the context of a point on an elliptic curve
97 //
98 // Returns:                   Reason:
99 //    ippStsNullPtrErr          pPoint == NULL
100 //                              pEC == NULL
101 //
102 //    ippStsContextMatchErr     invalid pEC->idCtx
103 //
104 //    ippStsNoErr               no error
105 //
106 // Parameters:
107 //    pX, pY    Pointers to the X and Y coordinates of a point on the elliptic curve
108 //    pPoint    Pointer to the IppsGFpECPoint context being initialized
109 //    pEC       Pointer to the context of the elliptic curve
110 //
111 *F*/
112 
113 IPPFUN(IppStatus, ippsGFpECPointInit,(const IppsGFpElement* pX, const IppsGFpElement* pY,
114                                       IppsGFpECPoint* pPoint, IppsGFpECState* pEC))
115 {
116    IPP_BAD_PTR2_RET(pPoint, pEC);
117    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
118    IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
119 
120    {
121       Ipp8u* ptr = (Ipp8u*)pPoint;
122       int elemLen = GFP_FELEN(GFP_PMA(ECP_GFP(pEC)));
123 
124       ECP_POINT_ID(pPoint) = idCtxGFPPoint;
125       ECP_POINT_FLAGS(pPoint) = 0;
126       ECP_POINT_FELEN(pPoint) = elemLen;
127       ptr += sizeof(IppsGFpECPoint);
128       ECP_POINT_DATA(pPoint) = (BNU_CHUNK_T*)(ptr);
129 
130       if(pX && pY)
131          return ippsGFpECSetPoint(pX, pY, pPoint, pEC);
132       else {
133          gfec_SetPointAtInfinity(pPoint);
134          return ippStsNoErr;
135       }
136    }
137 }
138