library/bignum_internal.h

/**
 *  Internal bignum functions
 *
 *  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_INTERNAL_H
#define MBEDTLS_BIGNUM_INTERNAL_H

#include "common.h"

#if defined(MBEDTLS_BIGNUM_C)
#include "mbedtls/bignum.h"
#endif

/** Perform a known-size multiply accumulate operation
 *
 * Add \p b * \p s to \p d.
 *
 * \param[in,out] d     The pointer to the (little-endian) array
 *                      representing the bignum to accumulate onto.
 * \param d_len         The number of limbs of \p d. This must be
 *                      at least \p s_len.
 * \param[in] s         The pointer to the (little-endian) array
 *                      representing the bignum to multiply with.
 *                      This may be the same as \p d. Otherwise,
 *                      it must be disjoint from \p d.
 * \param s_len         The number of limbs of \p s.
 * \param b             A scalar to multiply with.
 *
 * \return c            The carry at the end of the operation.
 */
mbedtls_mpi_uint mbedtls_mpi_core_mla( mbedtls_mpi_uint *d, size_t d_len ,
                                       const mbedtls_mpi_uint *s, size_t s_len,
                                       mbedtls_mpi_uint b );

#endif /* MBEDTLS_BIGNUM_INTERNAL_H */