af3f39c01c
Co-authored-by: Tom Cosgrove <81633263+tom-cosgrove-arm@users.noreply.github.com> Co-authored-by: Werner Lewis <Werner.Lewis@arm.com> Signed-off-by: Janos Follath <janos.follath@arm.com>
79 lines
3.2 KiB
C
79 lines
3.2 KiB
C
/**
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* Low-level modular bignum functions
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*
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* This interface should only be used by the higher-level modular bignum
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* module (bignum_mod.c) and the ECP module (ecp.c, ecp_curves.c). All other
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* modules should use the high-level modular bignum interface (bignum_mod.h)
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* or the legacy bignum interface (bignum.h).
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_BIGNUM_MOD_RAW_H
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#define MBEDTLS_BIGNUM_MOD_RAW_H
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#include "common.h"
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#if defined(MBEDTLS_BIGNUM_C)
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#include "mbedtls/bignum.h"
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#endif
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#include "bignum_mod.h"
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/** Import X from unsigned binary data.
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*
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* The MPI needs to have enough limbs to store the full value (including any
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* most significant zero bytes in the input).
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*
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* \param[out] X The address of the MPI. The size is determined by \p m.
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* (In particular, it must have at least as many limbs as
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* the modulus \p m.)
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* \param[in] m The address of the modulus related to \p X.
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* \param[in] input The input buffer to import from.
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* \param input_length The length in bytes of \p input.
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*
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* \return \c 0 if successful.
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* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p X isn't
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* large enough to hold the value in \p input.
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* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if the external representation
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* of \p m is invalid or \p X is not less than \p m.
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*/
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int mbedtls_mpi_mod_raw_read( mbedtls_mpi_uint *X,
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const mbedtls_mpi_mod_modulus *m,
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const unsigned char *input,
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size_t input_length );
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/** Export A into unsigned binary data.
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*
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* \param[in] A The address of the MPI. The size is determined by \p m.
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* (In particular, it must have at least as many limbs as
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* the modulus \p m.)
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* \param[in] m The address of the modulus related to \p A.
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* \param[out] output The output buffer to export to.
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* \param output_length The length in bytes of \p output.
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*
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* \return \c 0 if successful.
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* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p output isn't
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* large enough to hold the value of \p A.
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* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if the external representation
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* of \p m is invalid.
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*/
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int mbedtls_mpi_mod_raw_write( const mbedtls_mpi_uint *A,
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const mbedtls_mpi_mod_modulus *m,
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unsigned char *output,
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size_t output_length );
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#endif /* MBEDTLS_BIGNUM_MOD_RAW_H */
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