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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 "pcpaesm.h"
- #include "pcptool.h"
- #include "pcprijtables.h"
- /*
- // AES-CRT processing.
- //
- // 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
- // dataLen input/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
- //
- */
- static
- IppStatus cpProcessAES_ctr(const Ipp8u* pSrc, Ipp8u* pDst, int dataLen,
- const IppsAESSpec* pCtx,
- Ipp8u* pCtrValue, int ctrNumBitSize)
- {
- /* test context */
- IPP_BAD_PTR1_RET(pCtx);
- /* use aligned AES context */
- pCtx = (IppsAESSpec*)( IPP_ALIGNED_PTR(pCtx, AES_ALIGNMENT) );
- /* test the context ID */
- IPP_BADARG_RET(!VALID_AES_ID(pCtx), ippStsContextMatchErr);
- /* test source, target and counter block pointers */
- IPP_BAD_PTR3_RET(pSrc, pDst, pCtrValue);
- /* test stream length */
- IPP_BADARG_RET((dataLen<1), ippStsLengthErr);
- /* test counter block size */
- IPP_BADARG_RET(((MBS_RIJ128*8)<ctrNumBitSize)||(ctrNumBitSize<1), ippStsCTRSizeErr);
- {
- Ipp32u counter[NB(128)];
- Ipp32u output[NB(128)];
- /* setup encoder method */
- RijnCipher encoder = RIJ_ENCODER(pCtx);
- /* copy counter */
- CopyBlock16(pCtrValue, counter);
- /*
- // encrypt block-by-block aligned streams
- */
- while(dataLen>= MBS_RIJ128) {
- /* encrypt counter block */
- encoder((Ipp8u*)counter, (Ipp8u*)output, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), RijEncSbox);
- /* compute ciphertext block */
- if( !(IPP_UINT_PTR(pSrc) & 0x3) && !(IPP_UINT_PTR(pDst) & 0x3)) {
- ((Ipp32u*)pDst)[0] = output[0]^((Ipp32u*)pSrc)[0];
- ((Ipp32u*)pDst)[1] = output[1]^((Ipp32u*)pSrc)[1];
- ((Ipp32u*)pDst)[2] = output[2]^((Ipp32u*)pSrc)[2];
- ((Ipp32u*)pDst)[3] = output[3]^((Ipp32u*)pSrc)[3];
- }
- else
- XorBlock16(pSrc, output, pDst);
- /* encrement counter block */
- StdIncrement((Ipp8u*)counter,MBS_RIJ128*8, ctrNumBitSize);
- pSrc += MBS_RIJ128;
- pDst += MBS_RIJ128;
- dataLen -= MBS_RIJ128;
- }
- /*
- // encrypt last data block
- */
- if(dataLen) {
- /* encrypt counter block */
- encoder((Ipp8u*)counter, (Ipp8u*)output, RIJ_NR(pCtx), RIJ_EKEYS(pCtx), RijEncSbox);
- /* compute ciphertext block */
- XorBlock(pSrc, output, pDst,dataLen);
- /* encrement counter block */
- StdIncrement((Ipp8u*)counter,MBS_RIJ128*8, ctrNumBitSize);
- }
- /* update counter */
- CopyBlock16(counter, pCtrValue);
- return ippStsNoErr;
- }
- }
- IPPFUN(IppStatus, ippsAESEncryptCTR,(const Ipp8u* pSrc, Ipp8u* pDst, int dataLen,
- const IppsAESSpec* pCtx,
- Ipp8u* pCtrValue, int ctrNumBitSize))
- {
- return cpProcessAES_ctr(pSrc, pDst, dataLen, pCtx, pCtrValue, ctrNumBitSize);
- }
- IPPFUN(IppStatus, ippsAESDecryptCTR,(const Ipp8u* pSrc, Ipp8u* pDst, int dataLen,
- const IppsAESSpec* pCtx,
- Ipp8u* pCtrValue, int ctrNumBitSize))
- {
- return cpProcessAES_ctr(pSrc, pDst, dataLen, pCtx, pCtrValue, ctrNumBitSize);
- }
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