141 lines
5 KiB
C
141 lines
5 KiB
C
/**
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* Internal bignum functions
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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_CORE_H
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#define MBEDTLS_BIGNUM_CORE_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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#define MPI_VALIDATE_RET( cond ) \
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MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_MPI_BAD_INPUT_DATA )
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#define MPI_VALIDATE( cond ) \
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MBEDTLS_INTERNAL_VALIDATE( cond )
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#define ciL (sizeof(mbedtls_mpi_uint)) /* chars in limb */
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#define biL (ciL << 3) /* bits in limb */
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#define biH (ciL << 2) /* half limb size */
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/*
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* Convert between bits/chars and number of limbs
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* Divide first in order to avoid potential overflows
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*/
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#define BITS_TO_LIMBS(i) ( (i) / biL + ( (i) % biL != 0 ) )
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#define CHARS_TO_LIMBS(i) ( (i) / ciL + ( (i) % ciL != 0 ) )
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/** Count leading zero bits in a given integer.
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*
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* \param x Integer to count leading zero bits.
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*
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* \return Tne munber of leading zero bits in \p x.
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*/
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size_t mbedtls_mpi_core_clz( const mbedtls_mpi_uint x );
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/** Return the number of bits of an MPI.
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*
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* \param X The address of the MPI.
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* \param nx The number of limbs of \p X.
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*
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* \return Tne number of bits in \p X.
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*/
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size_t mbedtls_mpi_core_bitlen( const mbedtls_mpi_uint *X, size_t nx );
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/** Convert a big-endian byte array aligned to the size of mbedtls_mpi_uint
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* into the storage form used by mbedtls_mpi.
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*
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* \param X The address of the MPI.
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* \param limbs The number of limbs of \p X.
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*/
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void mbedtls_mpi_core_bigendian_to_host( mbedtls_mpi_uint * const X,
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size_t limbs );
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/** Import X from unsigned binary data, little endian.
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*
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* This function is guaranteed to return an MPI with at least the necessary
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* number of limbs (in particular, it does not skip 0s in the input).
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*
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* \param X The address of the MPI.
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* \param nx The number of limbs of \p X.
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* \param buf The input buffer to import from.
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* \param buflen Tne length in bytes of \p buf.
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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 buf.
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*/
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int mbedtls_mpi_core_read_le( mbedtls_mpi_uint *X,
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size_t nx,
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const unsigned char *buf,
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size_t buflen );
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/** Import X from unsigned binary data, big endian.
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*
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* This function is guaranteed to return an MPI with exactly the necessary
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* number of limbs (in particular, it does not skip 0s in the input).
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*
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* \param X The address of the MPI.
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* \param nx The number of limbs of \p X.
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* \param buf The input buffer to import from.
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* \param buflen Tne length in bytes of \p buf.
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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 buf.
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*/
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int mbedtls_mpi_core_read_be( mbedtls_mpi_uint *X,
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size_t nx,
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const unsigned char *buf,
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size_t buflen );
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/** Export X into unsigned binary data, little endian.
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*
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* \param X The address of the MPI.
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* \param nx The number of limbs of \p X.
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* \param buf The output buffer to import.
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* \param buflen Tne length in bytes of \p buf.
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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 buf isn't
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* large enough to hold the value of \p X.
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*/
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int mbedtls_mpi_core_write_le( const mbedtls_mpi_uint *X,
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size_t nx,
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unsigned char *buf,
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size_t buflen );
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/** Export X into unsigned binary data, big endian.
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*
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* \param X The address of the MPI.
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* \param nx The number of limbs of \p X.
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* \param buf The output buffer to import.
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* \param buflen Tne length in bytes of \p buf.
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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 buf isn't
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* large enough to hold the value of \p X.
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*/
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int mbedtls_mpi_core_write_be( const mbedtls_mpi_uint *X,
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size_t nx,
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unsigned char *buf,
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size_t buflen );
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#endif /* MBEDTLS_BIGNUM_CORE_H */
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