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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 "owncp.h"
- #include "pcpbnuarith.h"
- void cpMontRedAdc_BNU(BNU_CHUNK_T* pR,
- BNU_CHUNK_T* pProduct,
- const BNU_CHUNK_T* pModulus, cpSize nsM, BNU_CHUNK_T m0)
- {
- BNU_CHUNK_T carry;
- BNU_CHUNK_T extension;
- cpSize n;
- for(n=0, carry = 0; n<(nsM-1); n++) {
- BNU_CHUNK_T u = pProduct[n]*m0;
- BNU_CHUNK_T t = pProduct[nsM +n +1] + carry;
- extension = cpAddMulDgt_BNU(pProduct+n, pModulus, nsM, u);
- ADD_AB(carry, pProduct[nsM+n], pProduct[nsM+n], extension);
- t += carry;
- carry = t<pProduct[nsM+n+1];
- pProduct[nsM+n+1] = t;
- }
- m0 *= pProduct[nsM-1];
- extension = cpAddMulDgt_BNU(pProduct+nsM-1, pModulus, nsM, m0);
- ADD_AB(extension, pProduct[2*nsM-1], pProduct[2*nsM-1], extension);
- carry |= extension;
- carry -= cpSub_BNU(pR, pProduct+nsM, pModulus, nsM);
- /* condition copy: R = carry? Product+mSize : R */
- MASKED_COPY_BNU(pR, carry, pProduct+nsM, pR, nsM);
- }
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