/*******************************************************************************
* Copyright 2013-2018 Intel Corporation
* All Rights Reserved.
*
* If this software was obtained under the Intel Simplified Software License,
* the following terms apply:
*
* The source code, information and material ("Material") contained herein is
* owned by Intel Corporation or its suppliers or licensors, and title to such
* Material remains with Intel Corporation or its suppliers or licensors. The
* Material contains proprietary information of Intel or its suppliers and
* licensors. The Material is protected by worldwide copyright laws and treaty
* provisions. No part of the Material may be used, copied, reproduced,
* modified, published, uploaded, posted, transmitted, distributed or disclosed
* in any way without Intel's prior express written permission. No license under
* any patent, copyright or other intellectual property rights in the Material
* is granted to or conferred upon you, either expressly, by implication,
* inducement, estoppel or otherwise. Any license under such intellectual
* property rights must be express and approved by Intel in writing.
*
* Unless otherwise agreed by Intel in writing, you may not remove or alter this
* notice or any other notice embedded in Materials by Intel or Intel's
* suppliers or licensors in any way.
*
*
* If this software was obtained under the Apache License, Version 2.0 (the
* "License"), the following terms apply:
*
* 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 (CBC mode)
// AES encryption/decryption (CBC-CS mode)
//
// Contents:
// ippsAESDecryptCBC()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpaesm.h"
#include "pcptool.h"
#if !defined(_PCP_AES_CBC_H_)
#define _PCP_AES_CBC_H_
#if (_ALG_AES_SAFE_==_ALG_AES_SAFE_COMPOSITE_GF_)
# pragma message("_ALG_AES_SAFE_COMPOSITE_GF_ enabled")
#elif (_ALG_AES_SAFE_==_ALG_AES_SAFE_COMPACT_SBOX_)
# pragma message("_ALG_AES_SAFE_COMPACT_SBOX_ enabled")
# include "pcprijtables.h"
#else
# pragma message("_ALG_AES_SAFE_ disabled")
#endif
/*
// AES-CBC decryption
//
// Parameters:
// pIV pointer to the initialization vector
// pSrc pointer to the source data buffer
// pDst pointer to the target data buffer
// nBlocks number of decrypted data blocks
// pCtx pointer to the AES context
*/
static
void cpDecryptAES_cbc(const Ipp8u* pIV,
const Ipp8u* pSrc, Ipp8u* pDst, int nBlocks,
const IppsAESSpec* pCtx)
{
#if (_IPP>=_IPP_P8) || (_IPP32E>=_IPP32E_Y8)
/* use pipelined version is possible */
if(AES_NI_ENABLED==RIJ_AESNI(pCtx)) {
DecryptCBC_RIJ128pipe_AES_NI(pSrc, pDst, RIJ_NR(pCtx), RIJ_DKEYS(pCtx), nBlocks*MBS_RIJ128, pIV);
}
else
#endif
{
/* setup decoder method */
RijnCipher decoder = RIJ_DECODER(pCtx);
/* copy IV */
Ipp32u iv[NB(128)];
CopyBlock16(pIV, iv);
/* not inplace block-by-block decryption */
if(pSrc != pDst) {
while(nBlocks) {
//decoder((const Ipp32u*)pSrc, (Ipp32u*)pDst, RIJ_NR(pCtx), RIJ_DKEYS(pCtx), (const Ipp32u (*)[256])RIJ_DEC_SBOX(pCtx));
#if (_ALG_AES_SAFE_==_ALG_AES_SAFE_COMPACT_SBOX_)
decoder(pSrc, pDst, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), RijDecSbox/*NULL*/);
#else
decoder(pSrc, pDst, RIJ_NR(pCtx), RIJ_DKEYS(pCtx), NULL);
#endif
((Ipp32u*)pDst)[0] ^= iv[0];
((Ipp32u*)pDst)[1] ^= iv[1];
((Ipp32u*)pDst)[2] ^= iv[2];
((Ipp32u*)pDst)[3] ^= iv[3];
iv[0] = ((Ipp32u*)pSrc)[0];
iv[1] = ((Ipp32u*)pSrc)[1];
iv[2] = ((Ipp32u*)pSrc)[2];
iv[3] = ((Ipp32u*)pSrc)[3];
pSrc += MBS_RIJ128;
pDst += MBS_RIJ128;
nBlocks--;
}
}
/* inplace block-by-block decryption */
else {
Ipp32u tmpInp[NB(128)];
Ipp32u tmpOut[NB(128)];
while(nBlocks) {
CopyBlock16(pSrc, tmpInp);
//decoder(tmpInp, tmpOut, RIJ_NR(pCtx), RIJ_DKEYS(pCtx), (const Ipp32u (*)[256])RIJ_DEC_SBOX(pCtx));
#if (_ALG_AES_SAFE_==_ALG_AES_SAFE_COMPACT_SBOX_)
decoder((Ipp8u*)tmpInp, (Ipp8u*)tmpOut, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), RijDecSbox/*NULL*/);
#else
decoder((Ipp8u*)tmpInp, (Ipp8u*)tmpOut, RIJ_NR(pCtx), RIJ_DKEYS(pCtx), NULL);
#endif
tmpOut[0] ^= iv[0];
tmpOut[1] ^= iv[1];
tmpOut[2] ^= iv[2];
tmpOut[3] ^= iv[3];
CopyBlock16(tmpOut, pDst);
iv[0] = tmpInp[0];
iv[1] = tmpInp[1];
iv[2] = tmpInp[2];
iv[3] = tmpInp[3];
pSrc += MBS_RIJ128;
pDst += MBS_RIJ128;
nBlocks--;
}
}
}
}
/*
// AES-CBC ecnryption
//
// Parameters:
// pIV pointer to the initialization vector
// pSrc pointer to the source data buffer
// pDst pointer to the target data buffer
// nBlocks number of ecnrypted data blocks
// pCtx pointer to the AES context
*/
static
void cpEncryptAES_cbc(const Ipp8u* pIV,
const Ipp8u* pSrc, Ipp8u* pDst, int nBlocks, const IppsAESSpec* pCtx)
{
#if (_IPP>=_IPP_P8) || (_IPP32E>=_IPP32E_Y8)
if(AES_NI_ENABLED==RIJ_AESNI(pCtx)) {
EncryptCBC_RIJ128_AES_NI(pSrc, pDst, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), nBlocks*MBS_RIJ128, pIV);
}
else
#endif
{
/* setup encoder method */
RijnCipher encoder = RIJ_ENCODER(pCtx);
/* read IV */
Ipp32u iv[NB(128)];
CopyBlock16(pIV, iv);
/* block-by-block encryption */
while(nBlocks) {
iv[0] ^= ((Ipp32u*)pSrc)[0];
iv[1] ^= ((Ipp32u*)pSrc)[1];
iv[2] ^= ((Ipp32u*)pSrc)[2];
iv[3] ^= ((Ipp32u*)pSrc)[3];
//encoder(iv, (Ipp32u*)pDst, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), (const Ipp32u (*)[256])RIJ_ENC_SBOX(pCtx));
#if (_ALG_AES_SAFE_==_ALG_AES_SAFE_COMPACT_SBOX_)
encoder((Ipp8u*)iv, pDst, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), RijEncSbox/*NULL*/);
#else
encoder((Ipp8u*)iv, pDst, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), NULL);
#endif
iv[0] = ((Ipp32u*)pDst)[0];
iv[1] = ((Ipp32u*)pDst)[1];
iv[2] = ((Ipp32u*)pDst)[2];
iv[3] = ((Ipp32u*)pDst)[3];
pSrc += MBS_RIJ128;
pDst += MBS_RIJ128;
nBlocks--;
}
}
}
#endif /* #if !defined(_PCP_AES_CBC_H_) */