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40 
41 /*
42 //
43 //  Purpose:
44 //     Cryptography Primitive.
45 //     EC over Prime Finite Field (EC Key Ecxhange, Diffie-Hellman version)
46 //
47 //  Contents:
48 //     ippsECCPSharedSecretDH()
49 //
50 //
51 */
52 
53 #include "owndefs.h"
54 #include "owncp.h"
55 #include "pcpeccp.h"
56 
57 
58 /*F*
59 //    Name: ippsECCPSharedSecretDH
60 //
61 // Purpose: Shared Secret Value Derivation
62 //          (Diffie-Hellman version).
63 //
64 // Returns:                   Reason:
65 //    ippStsNullPtrErr           NULL == pEC
66 //                               NULL == pPrivateA
67 //                               NULL == pPublicB
68 //                               NULL == pShare
69 //
70 //    ippStsContextMatchErr      illegal pEC->idCtx
71 //                               illegal pPrivateA->idCtx
72 //                               illegal pPublicB->idCtx
73 //                               illegal pShare->idCtx
74 //
75 //    ippStsRangeErr             not enough room for share key
76 //
77 //    ippStsShareKeyErr          (infinity) => z
78 //
79 //    ippStsNoErr                no errors
80 //
81 // Parameters:
82 //    pPrivateA   pointer to own   private key
83 //    pPublicB    pointer to alien public  key
84 //    pShare      pointer to the shareds secret value
85 //    pEC        pointer to the ECCP context
86 //
87 *F*/
88 IPPFUN(IppStatus, ippsECCPSharedSecretDH,(const IppsBigNumState* pPrivateA,
89                                           const IppsECCPPointState* pPublicB,
90                                           IppsBigNumState* pShare,
91                                           IppsECCPState* pEC))
92 {
93    IPP_BAD_PTR1_RET(pEC);
94    /* use aligned EC context */
95    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
96    IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
97 
98    return ippsGFpECSharedSecretDH(pPrivateA, pPublicB, pShare, pEC, (Ipp8u*)ECP_SBUFFER(pEC));
99 }
100