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40
41 /*
42 // Intel(R) Integrated Performance Primitives. Cryptography Primitives.
43 // Operations over GF(p) ectension.
44 //
45 // Context:
46 // pcpgfpxgetsize.c()
47 //
48 */
49
50 #include "owndefs.h"
51 #include "owncp.h"
52 #include "pcpgfpstuff.h"
53 #include "pcpgfpxstuff.h"
54 #include "pcptool.h"
55
56 /* Get context size */
cpGFExGetSize(int elemLen,int pelmLen,int numpe)57 static int cpGFExGetSize(int elemLen, int pelmLen, int numpe)
58 {
59 int ctxSize = 0;
60
61 /* size of GFp engine */
62 ctxSize = sizeof(gsModEngine)
63 + elemLen*sizeof(BNU_CHUNK_T) /* modulus */
64 + pelmLen*sizeof(BNU_CHUNK_T)*numpe; /* pool */
65
66 ctxSize = sizeof(IppsGFpState) /* size of IppsGFPState*/
67 + ctxSize; /* GFpx engine */
68 return ctxSize;
69 }
70
71 /*F*
72 // Name: ippsGFpxGetSize
73 //
74 // Purpose: Gets the size of the context of a GF(p^d) field.
75 //
76 // Returns: Reason:
77 // ippStsNullPtrErr pSize == NULL.
78 // ippStsContextMatchErr !GFP_TEST_ID(pGroundGF)
79 // ippStsBadArgErr degree is greater than or equal to 9 or is less than 2.
80 // ippStsNoErr no error
81 //
82 // Parameters:
83 // pGroundGF Pointer to the context of the finite field GF(p) being extended.
84 // degree Degree of the extension.
85 // pSize Pointer to the buffer size, in bytes, needed for the IppsGFpState
86 // context.
87 //
88 *F*/
89
90 IPPFUN(IppStatus, ippsGFpxGetSize, (const IppsGFpState* pGroundGF, int degree, int* pSize))
91 {
92 IPP_BAD_PTR2_RET(pGroundGF, pSize);
93 IPP_BADARG_RET( degree<IPP_MIN_GF_EXTDEG || degree >IPP_MAX_GF_EXTDEG, ippStsBadArgErr);
94 pGroundGF = (IppsGFpState*)( IPP_ALIGNED_PTR(pGroundGF, GFP_ALIGNMENT) );
95 IPP_BADARG_RET( !GFP_TEST_ID(pGroundGF), ippStsContextMatchErr );
96
97 #define MAX_GFx_SIZE (1<<15) /* max size (bytes) of GF element (32KB) */
98 {
99 int groundElmLen = GFP_FELEN(GFP_PMA(pGroundGF));
100 Ipp64u elmLen64 = (Ipp64u)(groundElmLen) *sizeof(BNU_CHUNK_T) *degree;
101 int elemLen = (int)LODWORD(elmLen64);
102 *pSize = 0;
103 IPP_BADARG_RET(elmLen64> MAX_GFx_SIZE, ippStsBadArgErr);
104
105 *pSize = cpGFExGetSize(elemLen, elemLen, GFPX_POOL_SIZE)
106 + GFP_ALIGNMENT;
107 return ippStsNoErr;
108 }
109 #undef MAX_GFx_SIZE
110 }
111