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40 
41 /*
42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
43 //
44 //     Context:
45 //        ippsGFpECPublicKey()
46 //
47 */
48 
49 #include "owndefs.h"
50 #include "owncp.h"
51 #include "pcpgfpecstuff.h"
52 
53 
54 
55 /*F*
56 //    Name: ippsGFpECPublicKey
57 //
58 // Purpose: Compute Public Key
59 //
60 // Returns:                Reason:
61 //    ippStsNullPtrErr        NULL == pEC
62 //                            NULL == pPrivate
63 //                            NULL == pPublic
64 //                            NULL == pScratchBuffer
65 //
66 //    ippStsContextMatchErr   illegal pEC->idCtx
67 //                            pEC->subgroup == NULL
68 //                            illegal pPrivate->idCtx
69 //                            illegal pPublic->idCtx
70 //
71 //    ippStsIvalidPrivateKey  !(0 < pPrivate < order)
72 //
73 //    ippStsRangeErr          ECP_POINT_FELEN(pPublic)<GFP_FELEN()
74 //
75 //    ippStsNoErr             no errors
76 //
77 // Parameters:
78 //    pPrivate       pointer to the private key
79 //    pPublic        pointer to the resultant public key
80 //    pEC            pointer to the EC context
81 //    pScratchBuffer pointer to buffer (1 mul_point operation)
82 //
83 *F*/
84 IPPFUN(IppStatus, ippsGFpECPublicKey, (const IppsBigNumState* pPrivate, IppsGFpECPoint* pPublic,
85                                       IppsGFpECState* pEC, Ipp8u* pScratchBuffer))
86 {
87    /* EC context and buffer */
88    IPP_BAD_PTR2_RET(pEC, pScratchBuffer);
89    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
90    IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
91    IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr);
92 
93    /* test private keys */
94    IPP_BAD_PTR1_RET(pPrivate);
95    pPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPrivate, ALIGN_VAL) );
96    IPP_BADARG_RET(!BN_VALID_ID(pPrivate), ippStsContextMatchErr);
97 
98    /* test public key */
99    IPP_BAD_PTR1_RET(pPublic);
100    IPP_BADARG_RET(!ECP_POINT_TEST_ID(pPublic), ippStsContextMatchErr);
101    IPP_BADARG_RET(ECP_POINT_FELEN(pPublic)<GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsRangeErr);
102 
103    {
104       BNU_CHUNK_T* pS= BN_NUMBER(pPrivate);
105       int nsS= BN_SIZE(pPrivate);
106 
107       BNU_CHUNK_T* pOrder = MOD_MODULUS(ECP_MONT_R(pEC));
108       int orderLen = BITS_BNU_CHUNK(ECP_ORDBITSIZE(pEC));
109 
110       IPP_BADARG_RET(cpEqu_BNU_CHUNK(pS, nsS, 0)
111                || 0<=cpCmp_BNU(pS, nsS, pOrder, orderLen), ippStsIvalidPrivateKey);
112 
113       /* calculates public key */
114       gfec_MulBasePoint(pPublic, pS, nsS, pEC, pScratchBuffer);
115 
116       return ippStsNoErr;
117    }
118 }
119