/*************************************************************************
* 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.
//     AES encryption/decryption (CTR mode)
//
//  Contents:
//        ippsAESDecryptCTR()
//
*/
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
#pragma warning(disable : 4206) // empty unit
#endif

#include "owndefs.h"
#include "owncp.h"
#include "pcpaesm.h"
#include "pcptool.h"
#include "pcpaes_ctr_process.h"

/*
// Name: ippsAESDecryptCTR
//
// Purpose:
//        AES-CTR dencryption.
//
// Returns:                Reason:
//    ippStsNullPtrErr        pCtx == NULL
//                            pSrc == NULL
//                            pDst == NULL
//                            pCtrValue ==NULL
//    ippStsContextMatchErr   !VALID_AES_ID()
//    ippStsLengthErr         len <1
//    ippStsCTRSizeErr        128 < ctrNumBitSize < 1
//    ippStsNoErr             no errors
//
// Parameters:
//    pSrc           pointer to the source data buffer
//    pDst           pointer to the target data buffer
//    len            output buffer length (in bytes)
//    pCtx           pointer to rge AES context
//    pCtrValue      pointer to the counter block
//    ctrNumBitSize  counter block size (bits)
//
// Note:
//    counter will updated on return
//
*/

/* clang-format off */
IPPFUN(IppStatus, ippsAESDecryptCTR, (const Ipp8u* pSrc,
                                      Ipp8u* pDst,
                                      int len,
                                      const IppsAESSpec* pCtx,
                                      Ipp8u* pCtrValue,
                                      int ctrNumBitSize))
/* clang-format on */
{
    /* test context */
    IPP_BAD_PTR1_RET(pCtx);

#if (_IPP32E >= _IPP32E_Y8)
    if (AES_NI_ENABLED == RIJ_AESNI(pCtx))
        return ctrNumBitSize == 128
                   ? cpProcessAES_ctr128(pSrc, pDst, len, pCtx, pCtrValue)
                   : cpProcessAES_ctr(pSrc, pDst, len, pCtx, pCtrValue, ctrNumBitSize);
    else
        return cpProcessAES_ctr(pSrc, pDst, len, pCtx, pCtrValue, ctrNumBitSize);
#else
    return cpProcessAES_ctr(pSrc, pDst, len, pCtx, pCtrValue, ctrNumBitSize);
#endif
}
