125 lines
4.3 KiB
C
125 lines
4.3 KiB
C
/**
|
|
* 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_CORE_H
|
|
#define MBEDTLS_BIGNUM_CORE_H
|
|
|
|
#include "common.h"
|
|
|
|
#if defined(MBEDTLS_BIGNUM_C)
|
|
#include "mbedtls/bignum.h"
|
|
#endif
|
|
|
|
/** Count leading zero bits in a given integer.
|
|
*
|
|
* \param x Integer to count leading zero bits.
|
|
*
|
|
* \return The number of leading zero bits in \p x.
|
|
*/
|
|
size_t mbedtls_mpi_core_clz( const mbedtls_mpi_uint x );
|
|
|
|
/** Return the number of bits of an MPI.
|
|
*
|
|
* \param X The address of the MPI.
|
|
* \param nx The number of limbs of \p X.
|
|
*
|
|
* \return The number of bits in \p X.
|
|
*/
|
|
size_t mbedtls_mpi_core_bitlen( const mbedtls_mpi_uint *X, size_t nx );
|
|
|
|
/** Convert a big-endian byte array aligned to the size of mbedtls_mpi_uint
|
|
* into the storage form used by mbedtls_mpi.
|
|
*
|
|
* \param X The address of the MPI.
|
|
* \param limbs The number of limbs of \p X.
|
|
*/
|
|
void mbedtls_mpi_core_bigendian_to_host( mbedtls_mpi_uint * const X,
|
|
size_t limbs );
|
|
|
|
/** Import X from unsigned binary data, little endian.
|
|
*
|
|
* The MPI needs to have enough limbs to store the full value (in particular,
|
|
* this function does not skip 0s in the input).
|
|
*
|
|
* \param X The address of the MPI.
|
|
* \param nx The number of limbs of \p X.
|
|
* \param buf The input buffer to import from.
|
|
* \param buflen The length in bytes of \p buf.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p X isn't
|
|
* large enough to hold the value in \p buf.
|
|
*/
|
|
int mbedtls_mpi_core_read_le( mbedtls_mpi_uint *X,
|
|
size_t nx,
|
|
const unsigned char *buf,
|
|
size_t buflen );
|
|
|
|
/** Import X from unsigned binary data, big endian.
|
|
*
|
|
* The MPI needs to have enough limbs to store the full value (in particular,
|
|
* this function does not skip 0s in the input).
|
|
*
|
|
* \param X The address of the MPI.
|
|
* \param nx The number of limbs of \p X.
|
|
* \param buf The input buffer to import from.
|
|
* \param buflen The length in bytes of \p buf.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p X isn't
|
|
* large enough to hold the value in \p buf.
|
|
*/
|
|
int mbedtls_mpi_core_read_be( mbedtls_mpi_uint *X,
|
|
size_t nx,
|
|
const unsigned char *buf,
|
|
size_t buflen );
|
|
|
|
/** Export X into unsigned binary data, little endian.
|
|
*
|
|
* \param X The address of the MPI.
|
|
* \param nx The number of limbs of \p X.
|
|
* \param buf The output buffer to export to.
|
|
* \param buflen The length in bytes of \p buf.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p buf isn't
|
|
* large enough to hold the value of \p X.
|
|
*/
|
|
int mbedtls_mpi_core_write_le( const mbedtls_mpi_uint *X,
|
|
size_t nx,
|
|
unsigned char *buf,
|
|
size_t buflen );
|
|
|
|
/** Export X into unsigned binary data, big endian.
|
|
*
|
|
* \param X The address of the MPI.
|
|
* \param nx The number of limbs of \p X.
|
|
* \param buf The output buffer to export to.
|
|
* \param buflen The length in bytes of \p buf.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p buf isn't
|
|
* large enough to hold the value of \p X.
|
|
*/
|
|
int mbedtls_mpi_core_write_be( const mbedtls_mpi_uint *X,
|
|
size_t nx,
|
|
unsigned char *buf,
|
|
size_t buflen );
|
|
|
|
#endif /* MBEDTLS_BIGNUM_CORE_H */
|