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Merge pull request #6941 from gabor-mezei-arm/6375_quasi-reduction_function

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Add function to fix quasi-reduction
This commit is contained in:
Gilles Peskine
2023-01-31 11:25:25 +01:00
committed by GitHub
parent aae61257d1 db1607fa69
commit 470f10cfc5
5 changed files with 144 additions and 1 deletions
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15
library/bignum_mod_raw.c
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@@ -33,6 +33,8 @@
#include "bignum_mod.h"
#include "constant_time_internal.h"
#include "bignum_mod_raw_invasive.h"
void mbedtls_mpi_mod_raw_cond_assign(mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_mod_modulus *N,
@@ -118,6 +120,19 @@ void mbedtls_mpi_mod_raw_sub(mbedtls_mpi_uint *X,
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
}
#if defined(MBEDTLS_TEST_HOOKS)
MBEDTLS_STATIC_TESTABLE
void mbedtls_mpi_mod_raw_fix_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N)
{
mbedtls_mpi_uint c = mbedtls_mpi_core_sub(X, X, N->p, N->limbs);
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
}
#endif /* MBEDTLS_TEST_HOOKS */
void mbedtls_mpi_mod_raw_mul(mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,

46
library/bignum_mod_raw_invasive.h Normal file
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@@ -0,0 +1,46 @@
/**
* \file bignum_mod_raw_invasive.h
*
* \brief Function declarations for invasive functions of Low-level
* modular bignum.
*/
/**
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* 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.
*/
#ifndef MBEDTLS_BIGNUM_MOD_RAW_INVASIVE_H
#define MBEDTLS_BIGNUM_MOD_RAW_INVASIVE_H
#include "common.h"
#include "mbedtls/bignum.h"
#include "bignum_mod.h"
#if defined(MBEDTLS_TEST_HOOKS)
/** Convert the result of a quasi-reduction to its canonical representative.
*
* \param[in,out] X The address of the MPI to be converted. Must have the
* same number of limbs as \p N. The input value must
* be in range 0 <= X < 2N.
* \param[in] N The address of the modulus.
*/
MBEDTLS_STATIC_TESTABLE
void mbedtls_mpi_mod_raw_fix_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N);
#endif /* MBEDTLS_TEST_HOOKS */
#endif /* MBEDTLS_BIGNUM_MOD_RAW_INVASIVE_H */