/*************************************************************************
* Copyright (C) 2020 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 ECB encryption/decryption
// 
//  Contents:
//     cpSMS4_ECB_gfni_x1()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "sms4/pcpsms4.h"
#include "pcptool.h"

#if (_IPP32E >= _IPP32E_K1)

#if defined(__INTEL_COMPILER) || defined(__INTEL_LLVM_COMPILER) || !defined(_MSC_VER) || \
    (_MSC_VER >= 1920)

#include "sms4/pcpsms4_gfni.h"

IPP_OWN_DEFN(void, cpSMS4_ECB_gfni_x1, (Ipp8u * pOut, const Ipp8u* pInp, const Ipp32u* pRKey))
{
    __ALIGN16 __m128i TMP[6];
    /*
      TMP[0] = T
      TMP[1] = K0
      TMP[2] = K1
      TMP[3] = K2
      TMP[4] = K3
      TMP[5] = key4
   */

    TMP[1] = _mm_loadu_si128((__m128i*)pInp);
    TMP[1] = _mm_shuffle_epi8(TMP[1], M128(swapBytes));

    TMP[2] = _mm_alignr_epi32(TMP[1], TMP[1], 1);
    TMP[3] = _mm_alignr_epi32(TMP[1], TMP[1], 2);
    TMP[4] = _mm_alignr_epi32(TMP[1], TMP[1], 3);

    int itr;
    for (itr = 0; itr < 8; itr++, pRKey += 4) {
        TMP[5] = _mm_loadu_si128((__m128i*)pRKey);
        /* initial xors */
        TMP[0] = _mm_shuffle_epi32(TMP[5], 0x00); /* broadcast(key4 TMP[0]) */
        TMP[0] = _mm_xor_si128(TMP[0], TMP[2]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[3]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[4]);
        /* Sbox */
        TMP[0] = sBox128(TMP[0]);
        /* Sbox done, now L */
        TMP[1] = _mm_xor_si128(_mm_xor_si128(TMP[1], TMP[0]), L128(TMP[0]));

        /* initial xors */
        TMP[0] = _mm_shuffle_epi32(TMP[5], 0x55); /* broadcast(key4 TMP[1]) */
        TMP[0] = _mm_xor_si128(TMP[0], TMP[3]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[4]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[1]);
        /* Sbox */
        TMP[0] = sBox128(TMP[0]);
        /* Sbox done, now L */
        TMP[2] = _mm_xor_si128(_mm_xor_si128(TMP[2], TMP[0]), L128(TMP[0]));

        /* initial xors */
        TMP[0] = _mm_shuffle_epi32(TMP[5], 0xAA); /* broadcast(key4 TMP[2]) */
        TMP[0] = _mm_xor_si128(TMP[0], TMP[4]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[1]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[2]);
        /* Sbox */
        TMP[0] = sBox128(TMP[0]);
        /* Sbox done, now L */
        TMP[3] = _mm_xor_si128(_mm_xor_si128(TMP[3], TMP[0]), L128(TMP[0]));

        /* initial xors */
        TMP[0] = _mm_shuffle_epi32(TMP[5], 0xFF); /* broadcast(key4 TMP[3]) */
        TMP[0] = _mm_xor_si128(TMP[0], TMP[1]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[2]);
        TMP[0] = _mm_xor_si128(TMP[0], TMP[3]);
        /* Sbox */
        TMP[0] = sBox128(TMP[0]);
        /* Sbox done, now L */
        TMP[4] = _mm_xor_si128(_mm_xor_si128(TMP[4], TMP[0]), L128(TMP[0]));
    }

    TMP[0] = _mm_unpacklo_epi32(TMP[2], TMP[1]);
    TMP[5] = _mm_unpacklo_epi32(TMP[4], TMP[3]);
    TMP[1] = _mm_unpacklo_epi64(TMP[5], TMP[0]);

    TMP[1] = _mm_shuffle_epi8(TMP[1], M128(swapBytes));

    _mm_storeu_si128((__m128i*)pOut, TMP[1]);

    /* clear secret data */
    PurgeBlock(TMP, sizeof(TMP));
}

#endif /* #if defined (__INTEL_COMPILER) || defined (__INTEL_LLVM_COMPILER) || !defined (_MSC_VER) || (_MSC_VER >= 1920) */

#endif /* (_IPP32E>=_IPP32E_K1) */
