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40 
41 /*
42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
43 //     Operations over GF(p).
44 //
45 //     Context:
46 //        ippsGFpInitFixed()
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: ippsGFpInitFixed
59 //
60 // Purpose: initializes prime finite field GF(p)
61 //
62 // Returns:                   Reason:
63 //    ippStsNullPtrErr           NULL == pGFpMethod
64 //                               NULL == pGFp
65 //
66 //    ippStsBadArgErr            pGFpMethod != ippsGFpMethod_pXXX() any fixed prime method
67 //                               primeBitSize != sizeof modulus defined by fixed method
68 //
69 //    ippStsNoErr                no error
70 //
71 // Parameters:
72 //    primeBitSize   length of prime in bits
73 //    pGFpMethod     pointer to the basic arithmetic metods
74 //    pGFp           pointer to Finite Field context is being initialized
75 *F*/
76 IPPFUN(IppStatus, ippsGFpInitFixed,(int primeBitSize, const IppsGFpMethod* pGFpMethod, IppsGFpState* pGFp))
77 {
78    IPP_BAD_PTR2_RET(pGFpMethod, pGFp);
79    pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
80 
81    /* test method is prime based */
82    IPP_BADARG_RET(cpID_Prime!=(pGFpMethod->modulusID & cpID_Prime), ippStsBadArgErr);
83    /* test if method is not prime based arbitrary */
84    IPP_BADARG_RET(!pGFpMethod->modulus, ippStsBadArgErr);
85    /* size of the underlying prime must be equal to primeBitSize parameter*/
86    IPP_BADARG_RET(pGFpMethod->modulusBitDeg!=primeBitSize, ippStsBadArgErr);
87 
88    {
89       /* init GF */
90       IppStatus sts = cpGFpInitGFp(primeBitSize, pGFp);
91 
92       /* set up GF engine */
93       if(ippStsNoErr==sts) {
94          cpGFpSetGFp(pGFpMethod->modulus, primeBitSize, pGFpMethod, pGFp);
95       }
96 
97       return sts;
98    }
99 }
100