/*************************************************************************
* Copyright (C) 2013 Intel Corporation
*
* Licensed under the Apache License,  Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* 	http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law  or agreed  to  in  writing,  software
* distributed under  the License  is  distributed  on  an  "AS IS"  BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the  specific  language  governing  permissions  and
* limitations under the License.
*************************************************************************/

/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     RSASSA-PKCS-v1_5
// 
//     Signatire Scheme with Appendix Signatute Generation
// 
//  Contents:
//        ippsRSASign_PKCS1v15_rmf()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpngrsa.h"
#include "pcphash_rmf.h"
#include "pcptool.h"

#include "pcprsa_pkcs1c15_data.h"
#include "pcprsa_generatesign_pkcs1v15.h"
#include "pcprsa_pkcs1v15_preproc.h"

IPPFUN(IppStatus, ippsRSASign_PKCS1v15_rmf,(const Ipp8u* pMsg, int msgLen,
                                                  Ipp8u* pSign,
                                            const IppsRSAPrivateKeyState* pPrvKey,
                                            const IppsRSAPublicKeyState*  pPubKey,
                                            const IppsHashMethod* pMethod,
                                                  Ipp8u* pScratchBuffer))
{
   const IppStatus preprocResult = SingleSignPkcs1v15RmfPreproc(pMsg, msgLen, pSign,
      &pPrvKey, &pPubKey, pMethod, pScratchBuffer); // badargs and pointer alignments

   if (ippStsNoErr != preprocResult) {
      return preprocResult;
   }

   {
      Ipp8u md[IPP_SHA512_DIGEST_BITSIZE/BYTESIZE];
      int mdLen = pMethod->hashLen;
      ippsHashMessage_rmf(pMsg, msgLen, md, pMethod);

      {
         const Ipp8u* pSalt = pksc15_salt[pMethod->hashAlgId].pSalt;
         int saltLen = pksc15_salt[pMethod->hashAlgId].saltLen;

         int sts = GenerateSign(md, mdLen,
                         pSalt, saltLen,
                         pSign,
                         pPrvKey, pPubKey,
                         (BNU_CHUNK_T*)(IPP_ALIGNED_PTR((pScratchBuffer), (int)sizeof(BNU_CHUNK_T))));

         return (1==sts)? ippStsNoErr : ippStsSizeErr;
      }
   }
}
