mirror of
https://github.com/Mbed-TLS/mbedtls.git
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ed5c8d3d1e
The modulus value won't change during normal operations, make this clear in the struct and the function signatures. This won't prevent the caller from modifying the passed buffer, but might give a hint and reinforces the message of the documentation. Signed-off-by: Janos Follath <janos.follath@arm.com>
153 lines
3.7 KiB
C
153 lines
3.7 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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#include "common.h"
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#if defined(MBEDTLS_BIGNUM_C)
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#include <string.h>
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include "mbedtls/bignum.h"
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#define mbedtls_printf printf
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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#include "bignum_core.h"
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#include "bignum_mod.h"
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#include "bignum_mod_raw.h"
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#include "constant_time_internal.h"
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int mbedtls_mpi_mod_residue_setup( mbedtls_mpi_mod_residue *r,
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mbedtls_mpi_mod_modulus *m,
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mbedtls_mpi_uint *p,
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size_t pn )
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{
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if( pn < m->limbs || !mbedtls_mpi_core_lt_ct( m->p, p, pn ) )
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return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
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r->limbs = m->limbs;
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r->p = p;
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return( 0 );
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}
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void mbedtls_mpi_mod_residue_release( mbedtls_mpi_mod_residue *r )
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{
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if ( r == NULL )
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return;
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r->limbs = 0;
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r->p = NULL;
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}
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void mbedtls_mpi_mod_modulus_init( mbedtls_mpi_mod_modulus *m )
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{
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if ( m == NULL )
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return;
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m->p = NULL;
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m->limbs = 0;
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m->bits = 0;
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m->ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
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m->int_rep = MBEDTLS_MPI_MOD_REP_INVALID;
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}
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void mbedtls_mpi_mod_modulus_free( mbedtls_mpi_mod_modulus *m )
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{
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if ( m == NULL )
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return;
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switch( m->int_rep )
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{
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case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
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mbedtls_free( m->rep.mont );
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break;
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case MBEDTLS_MPI_MOD_REP_OPT_RED:
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mbedtls_free( m->rep.ored );
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break;
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case MBEDTLS_MPI_MOD_REP_INVALID:
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break;
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}
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m->p = NULL;
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m->limbs = 0;
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m->bits = 0;
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m->ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
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m->int_rep = MBEDTLS_MPI_MOD_REP_INVALID;
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}
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int mbedtls_mpi_mod_modulus_setup( mbedtls_mpi_mod_modulus *m,
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const mbedtls_mpi_uint *p,
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size_t pn,
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mbedtls_mpi_mod_ext_rep ext_rep,
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mbedtls_mpi_mod_rep_selector int_rep )
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{
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int ret = 0;
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m->p = p;
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m->limbs = pn;
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m->bits = mbedtls_mpi_core_bitlen( p, pn );
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switch( ext_rep )
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{
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case MBEDTLS_MPI_MOD_EXT_REP_LE:
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case MBEDTLS_MPI_MOD_EXT_REP_BE:
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m->ext_rep = ext_rep;
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break;
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default:
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ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
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goto exit;
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}
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switch( int_rep )
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{
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case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
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m->int_rep = int_rep;
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m->rep.mont = NULL;
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break;
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case MBEDTLS_MPI_MOD_REP_OPT_RED:
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m->int_rep = int_rep;
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m->rep.ored = NULL;
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break;
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default:
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ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
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goto exit;
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}
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exit:
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if( ret != 0 )
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{
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mbedtls_mpi_mod_modulus_free( m );
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}
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return( ret );
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}
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#endif /* MBEDTLS_BIGNUM_C */
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