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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     EC over Prime Finite Field (Sign, SM2 version)
// 
//  Contents:
//     ippsECCPSignSM2()
// 
// 
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpeccp.h"


/*F*
//    Name: ippsECCPSignSM2
//
// Purpose: Signing of message representative.
//          (SM2 version).
//
// Returns:                   Reason:
//    ippStsNullPtrErr           NULL == pEC
//                               NULL == pMsgDigest
//                               NULL == pRegPrivate
//                               NULL == pEphPrivate
//                               NULL == pSignR
//                               NULL == pSignS
//
//    ippStsContextMatchErr      illegal pEC->idCtx
//                               illegal pMsgDigest->idCtx
//                               illegal pRegPrivate->idCtx
//                               illegal pEphPrivate->idCtx
//                               illegal pSignR->idCtx
//                               illegal pSignS->idCtx
//
//    ippStsIvalidPrivateKey     (1 + regPrivate) >= order
//
//    ippStsMessageErr           MsgDigest >= order
//                               MsgDigest <  0
//
//    ippStsRangeErr             not enough room for:
//                               signR
//                               signS
//
//    ippStsEphemeralKeyErr      (signR + ephPrivate) == order
//                               (0==signR) || (0==signS)
//
//    ippStsNoErr                no errors
//
// Parameters:
//    pMsgDigest     pointer to the message representative to be signed
//    pRegPrivate    pointer to the regular private key
//    pEphPrivate    pointer to the ephemeral private key
//    pSignR,pSignS  pointer to the signature
//    pEC           pointer to the ECCP context
//
// Note:
//    ephemeral key computes inside ippsECCPSignSM2 in contrast with ippsECCPSignDSA,
//    where ephemeral key pair computed before call and setup in context
//
*F*/
IPPFUN(IppStatus, ippsECCPSignSM2,(const IppsBigNumState* pMsgDigest,
                                   const IppsBigNumState* pRegPrivate,
                                   const IppsBigNumState* pEphPrivate,
                                   IppsBigNumState* pSignR, IppsBigNumState* pSignS,
                                   IppsECCPState* pEC))
{
   /* use aligned EC context */
   IPP_BAD_PTR1_RET(pEC);
   pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
   IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);

   return ippsGFpECSignSM2(pMsgDigest,
                           pRegPrivate, pEphPrivate,
                           pSignR, pSignS,
                           pEC, (Ipp8u*)ECP_SBUFFER(pEC));
}