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- /*
- * Copyright (C) 2016 Intel Corporation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include "owndefs.h"
- #include "owncp.h"
- #include "pcprij128safe2.h"
- #include "pcprijtables.h"
- __INLINE Ipp8u getInvSboxValue(Ipp32u x)
- {
- Ipp32u t[sizeof(RijDecSbox)/CACHE_LINE_SIZE];
- const Ipp8u* SboxEntry = RijDecSbox +x%CACHE_LINE_SIZE;
- Ipp32u i;
- for(i=0; i<sizeof(RijDecSbox)/CACHE_LINE_SIZE; i+=4, SboxEntry += 4*CACHE_LINE_SIZE) {
- t[i] = SboxEntry[CACHE_LINE_SIZE*0];
- t[i+1] = SboxEntry[CACHE_LINE_SIZE*1];
- t[i+2] = SboxEntry[CACHE_LINE_SIZE*2];
- t[i+3] = SboxEntry[CACHE_LINE_SIZE*3];
- }
- return (Ipp8u)t[x/CACHE_LINE_SIZE];
- }
- __INLINE void invSubBytes(Ipp8u state[])
- {
- int i;
- for(i=0;i<16;i++)
- state[i] = getInvSboxValue((Ipp32u)state[i]);
- }
- __INLINE void invShiftRows(Ipp32u* state)
- {
- state[1] = ROR32(state[1], 24);
- state[2] = ROR32(state[2], 16);
- state[3] = ROR32(state[3], 8);
- }
- __INLINE void invMixColumns(Ipp32u* state)
- {
- Ipp32u y0 = state[1] ^ state[2] ^ state[3];
- Ipp32u y1 = state[0] ^ state[2] ^ state[3];
- Ipp32u y2 = state[0] ^ state[1] ^ state[3];
- Ipp32u y3 = state[0] ^ state[1] ^ state[2];
- Ipp32u t02, t13, t0123;
- state[0] = xtime4(state[0]);
- state[1] = xtime4(state[1]);
- state[2] = xtime4(state[2]);
- state[3] = xtime4(state[3]);
- y0 ^= state[0] ^ state[1];
- y1 ^= state[1] ^ state[2];
- y2 ^= state[2] ^ state[3];
- y3 ^= state[3] ^ state[0];
- t02 = state[0] ^ state[2];
- t13 = state[1] ^ state[3];
- t02 = xtime4(t02);
- t13 = xtime4(t13);
- t0123 = t02^t13;
- t0123 = xtime4(t0123);
- state[0] = y0 ^t02 ^t0123;
- state[1] = y1 ^t13 ^t0123;
- state[2] = y2 ^t02 ^t0123;
- state[3] = y3 ^t13 ^t0123;
- }
- void Safe2Decrypt_RIJ128(const Ipp8u* in,
- Ipp8u* out,
- int Nr,
- const Ipp8u* RoundKey,
- const void* sbox)
- {
- Ipp32u state[4];
- int round=0;
- UNREFERENCED_PARAMETER(sbox);
- // copy input to the state array
- TRANSPOSE((Ipp8u*)state, in);
- // add the round key to the state before starting the rounds.
- XorRoundKey((Ipp32u*)state, (Ipp32u*)(RoundKey+Nr*16));
- // there will be Nr rounds
- for(round=Nr-1;round>0;round--) {
- invShiftRows(state);
- invSubBytes((Ipp8u*)state);
- XorRoundKey(state,(Ipp32u*)(RoundKey+round*16));
- invMixColumns(state);
- }
- // last round
- invShiftRows(state);
- invSubBytes((Ipp8u*)state);
- XorRoundKey(state,(Ipp32u*)(RoundKey+0*16));
- // copy from the state to output
- TRANSPOSE(out, (Ipp8u*)state);
- }
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