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40 
41 /*
42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
43 //     EC over GF(p^m) definitinons
44 //
45 //     Context:
46 //        ippsGFpECGetSize()
47 //
48 */
49 
50 #include "owndefs.h"
51 #include "owncp.h"
52 #include "pcpgfpecstuff.h"
53 #include "pcpeccp.h"
54 
55 /*F*
56 // Name: ippsGFpECGetSize
57 //
58 // Purpose: Gets the size of an elliptic curve over the finite field
59 //
60 // Returns:                   Reason:
61 //    ippStsNullPtrErr              NULL == pGFp
62 //                                  NULL == pSize
63 //
64 //    ippStsContextMatchErr         invalid pGFp->idCtx
65 //
66 //    ippStsNoErr                   no error
67 //
68 // Parameters:
69 //    pGFp      Pointer to the IppsGFpState context of the underlying finite field
70 //    pSize     Buffer size in bytes needed for the IppsGFpECState context
71 //
72 *F*/
73 
74 IPPFUN(IppStatus, ippsGFpECGetSize,(const IppsGFpState* pGFp, int* pSize))
75 {
76    IPP_BAD_PTR2_RET(pGFp, pSize);
77    pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
78    IPP_BADARG_RET( !GFP_TEST_ID(pGFp), ippStsContextMatchErr );
79 
80    {
81       gsModEngine* pGFE = GFP_PMA(pGFp);
82       *pSize = cpGFpECGetSize(cpGFpBasicDegreeExtension(pGFE), GFP_FEBITLEN(cpGFpBasic(pGFE)))
83                 + ECGFP_ALIGNMENT;
84       return ippStsNoErr;
85    }
86 }
87