/*************************************************************************
* Copyright (C) 2017 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.
//     SMS4-CCM implementation.
// 
//     Content:
//        ippsSMS4_CCMTagLen()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpsms4authccm.h"
#include "pcptool.h"

/*F*
//    Name: ippsSMS4_CCMTagLen
//
// Purpose: Setup length of the tag.
//
// Returns:                Reason:
//    ippStsNullPtrErr        pCtx == NULL
//    ippStsContextMatchErr   !VALID_SMS4CCM_ID()
//    ippStsLengthErr         MBS_SMS4 < tagLen || tagLen < 4
//                            or odd value of tagLen
//    ippStsNoErr             no errors
//
// Parameters:
//    tagLen      length in bytes of the requested tag
//    pCtx        pointer to the CCM context
//
*F*/
IPPFUN(IppStatus, ippsSMS4_CCMTagLen,(int tagLen, IppsSMS4_CCMState* pCtx))
{
   /* test context */
   IPP_BAD_PTR1_RET(pCtx);
   IPP_BADARG_RET(!VALID_SMS4CCM_ID(pCtx), ippStsContextMatchErr);

   /* test tag length */
   IPP_BADARG_RET(tagLen>MBS_SMS4 || tagLen<4 || tagLen&1, ippStsLengthErr);

   /* init for new message */
   SMS4CCM_TAGLEN(pCtx) = (Ipp32u)tagLen;

   return ippStsNoErr;
}
