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40 
41 /*
42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
43 //     Operations over GF(p).
44 //
45 //     Context:
46 //        ippsGFpInitArbitrary()
47 //
48 */
49 #include "owndefs.h"
50 #include "owncp.h"
51 
52 #include "pcpgfpstuff.h"
53 #include "pcpgfpxstuff.h"
54 #include "pcptool.h"
55 
56 
57 /*F*
58 // Name: ippsGFpInitArbitrary
59 //
60 // Purpose: initializes prime finite field GF(p)
61 //
62 // Returns:                   Reason:
63 //    ippStsNullPtrErr           NULL == pPrime
64 //                               NULL == pGFp
65 //
66 //    ippStsSizeErr              !(IPP_MIN_GF_BITSIZE <= primeBitSize <=IPP_MAX_GF_BITSIZE)
67 //
68 //    ippStsContextMatchErr      incorrect pPrime context ID
69 //
70 //    ippStsBadArgErr            prime <0
71 //                               bitsize(prime) != primeBitSize
72 //                               prime <IPP_MIN_GF_CHAR
73 //                               prime is even
74 //
75 //    ippStsNoErr                no error
76 //
77 // Parameters:
78 //    pPrime         pointer to the prime context
79 //    primeBitSize   length of prime in bits
80 //    pGFp           pointer to Finite Field context is being initialized
81 *F*/
82 IPPFUN(IppStatus, ippsGFpInitArbitrary,(const IppsBigNumState* pPrime, int primeBitSize, IppsGFpState* pGFp))
83 {
84    IPP_BAD_PTR1_RET(pGFp);
85    pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
86 
87    IPP_BADARG_RET((primeBitSize< IPP_MIN_GF_BITSIZE) || (primeBitSize> IPP_MAX_GF_BITSIZE), ippStsSizeErr);
88 
89    IPP_BAD_PTR1_RET(pPrime);
90    pPrime = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPrime, BN_ALIGNMENT) );
91    IPP_BADARG_RET(!BN_VALID_ID(pPrime), ippStsContextMatchErr);
92    IPP_BADARG_RET(BN_SIGN(pPrime)!= IppsBigNumPOS, ippStsBadArgErr);                                   /* prime is negative */
93    IPP_BADARG_RET(BITSIZE_BNU(BN_NUMBER(pPrime),BN_SIZE(pPrime)) != primeBitSize, ippStsBadArgErr);  /* primeBitSize == bitsize(prime) */
94    IPP_BADARG_RET((BN_SIZE(pPrime)==1) && (BN_NUMBER(pPrime)[0]<IPP_MIN_GF_CHAR), ippStsBadArgErr);  /* prime < 3 */
95    IPP_BADARG_RET(0==(BN_NUMBER(pPrime)[0] & 1), ippStsBadArgErr);                                     /* prime is even */
96 
97    {
98       /* init GF */
99       IppStatus sts = cpGFpInitGFp(primeBitSize, pGFp);
100 
101       /* set up GF engine */
102       if(ippStsNoErr==sts) {
103          cpGFpSetGFp(BN_NUMBER(pPrime), primeBitSize, ippsGFpMethod_pArb(), pGFp);
104       }
105 
106       return sts;
107    }
108 }
109