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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 //        ippsGFpECSetPointOctString()
49 //
50 */
51 
52 #include "pcpgfpecessm2.h"
53 #include "pcpgfpecstuff.h"
54 
55 /*F*
56 //    Name: ippsGFpECSetPointOctString
57 //
58 // Purpose: Converts x||y octstring into a point on EC
59 //
60 // Returns:                   Reason:
61 //    ippStsNullPtrErr           pPoint == NULL / pEC == NULL / pStr == NULL
62 //    ippStsContextMatchErr      pEC, pPoint invalid context
63 //    ippStsNotSupportedModeErr  pGFE->extdegree > 1
64 //    ippStsSizeErr              strLen is not equal to double GFp element
65 //    ippStsOutOfRangeErr        X or Y from the string exceeds the EC's field modulus or the point does not belong to the EC
66 //    ippStsNoErr                no errors
67 //
68 // Parameters:
69 //    pStr     pointer to the string to read from
70 //    strLen   length of the string
71 //    pPoint   pointer to output point
72 //    pEC      EC ctx
73 //
74 *F*/
75 IPPFUN(IppStatus, ippsGFpECSetPointOctString, (const Ipp8u* pStr,
76    int strLen, IppsGFpECPoint* pPoint, IppsGFpECState* pEC)) {
77    IPP_BAD_PTR3_RET(pPoint, pEC, pStr);
78    IPP_BADARG_RET(pEC->idCtx != idCtxGFPEC, ippStsContextMatchErr);
79    IPP_BADARG_RET(!pEC->subgroup, ippStsContextMatchErr);
80    IPP_BADARG_RET(1 < pEC->pGF->pGFE->extdegree, ippStsNotSupportedModeErr);
81 
82    {
83       gsModEngine* pGFE = pEC->pGF->pGFE;
84       int elemLen = BITS2WORD8_SIZE(pGFE->modBitLen);
85       IPP_BADARG_RET(strLen != elemLen * 2, ippStsSizeErr);
86 
87       {
88          IppStatus ret;
89          IppsGFpElement ptX, ptY;
90          cpGFpElementConstruct(&ptX, cpGFpGetPool(1, pGFE), pGFE->modLen);
91          cpGFpElementConstruct(&ptY, cpGFpGetPool(1, pGFE), pGFE->modLen);
92 
93          ret = ippsGFpSetElementOctString(pStr, elemLen, &ptX, pEC->pGF);
94          if (ippStsNoErr == ret) {
95             pStr += elemLen;
96             ret = ippsGFpSetElementOctString(pStr, elemLen, &ptY, pEC->pGF);
97          }
98          if (ippStsNoErr == ret) {
99             ret = ippsGFpECSetPoint(&ptX, &ptY, pPoint, pEC);
100          }
101 
102          cpGFpReleasePool(2, pGFE); /* release ptX and ptY from the pool */
103 
104          return ret;
105       }
106    }
107 }