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40 
41 /*
42 //
43 //  Purpose:
44 //     Cryptography Primitive.
45 //     EC over Prime Finite Field (Sign, SM2 version)
46 //
47 //  Contents:
48 //     ippsECCPSignSM2()
49 //
50 //
51 */
52 
53 #include "owndefs.h"
54 #include "owncp.h"
55 #include "pcpeccp.h"
56 
57 
58 /*F*
59 //    Name: ippsECCPSignSM2
60 //
61 // Purpose: Signing of message representative.
62 //          (SM2 version).
63 //
64 // Returns:                   Reason:
65 //    ippStsNullPtrErr           NULL == pEC
66 //                               NULL == pMsgDigest
67 //                               NULL == pRegPrivate
68 //                               NULL == pEphPrivate
69 //                               NULL == pSignR
70 //                               NULL == pSignS
71 //
72 //    ippStsContextMatchErr      illegal pEC->idCtx
73 //                               illegal pMsgDigest->idCtx
74 //                               illegal pRegPrivate->idCtx
75 //                               illegal pEphPrivate->idCtx
76 //                               illegal pSignR->idCtx
77 //                               illegal pSignS->idCtx
78 //
79 //    ippStsIvalidPrivateKey     (1 + regPrivate) >= order
80 //
81 //    ippStsMessageErr           MsgDigest >= order
82 //                               MsgDigest <  0
83 //
84 //    ippStsRangeErr             not enough room for:
85 //                               signR
86 //                               signS
87 //
88 //    ippStsEphemeralKeyErr      (signR + ephPrivate) == order
89 //                               (0==signR) || (0==signS)
90 //
91 //    ippStsNoErr                no errors
92 //
93 // Parameters:
94 //    pMsgDigest     pointer to the message representative to be signed
95 //    pRegPrivate    pointer to the regular private key
96 //    pEphPrivate    pointer to the ephemeral private key
97 //    pSignR,pSignS  pointer to the signature
98 //    pEC           pointer to the ECCP context
99 //
100 // Note:
101 //    ephemeral key computes inside ippsECCPSignSM2 in contrast with ippsECCPSignDSA,
102 //    where ephemeral key pair computed before call and setup in context
103 //
104 *F*/
105 IPPFUN(IppStatus, ippsECCPSignSM2,(const IppsBigNumState* pMsgDigest,
106                                    const IppsBigNumState* pRegPrivate,
107                                    const IppsBigNumState* pEphPrivate,
108                                    IppsBigNumState* pSignR, IppsBigNumState* pSignS,
109                                    IppsECCPState* pEC))
110 {
111    /* use aligned EC context */
112    IPP_BAD_PTR1_RET(pEC);
113    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
114    IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
115 
116    return ippsGFpECSignSM2(pMsgDigest,
117                            pRegPrivate, pEphPrivate,
118                            pSignR, pSignS,
119                            pEC, (Ipp8u*)ECP_SBUFFER(pEC));
120 }
121