277 lines
6.8 KiB
C
277 lines
6.8 KiB
C
/**
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* Modular 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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#include "mbedtls/platform.h"
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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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const mbedtls_mpi_mod_modulus *m,
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mbedtls_mpi_uint *p,
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size_t p_limbs )
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{
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if( p_limbs != m->limbs || !mbedtls_mpi_core_lt_ct( p, m->p, m->limbs ) )
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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->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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if (m->rep.mont.rr != NULL)
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{
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mbedtls_platform_zeroize( (mbedtls_mpi_uint *) m->rep.mont.rr,
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m->limbs );
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mbedtls_free( (mbedtls_mpi_uint *)m->rep.mont.rr );
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m->rep.mont.rr = NULL;
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}
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m->rep.mont.mm = 0;
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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->int_rep = MBEDTLS_MPI_MOD_REP_INVALID;
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}
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static int set_mont_const_square( const mbedtls_mpi_uint **X,
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const mbedtls_mpi_uint *A,
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size_t limbs )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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mbedtls_mpi N;
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mbedtls_mpi RR;
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*X = NULL;
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mbedtls_mpi_init( &N );
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mbedtls_mpi_init( &RR );
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if( A == NULL || limbs == 0 || limbs >= ( MBEDTLS_MPI_MAX_LIMBS / 2 ) - 2 )
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goto cleanup;
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if( mbedtls_mpi_grow( &N, limbs ) )
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goto cleanup;
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memcpy( N.p, A, sizeof(mbedtls_mpi_uint) * limbs );
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ret = mbedtls_mpi_core_get_mont_r2_unsafe(&RR, &N);
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if( ret == 0 )
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{
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*X = RR.p;
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RR.p = NULL;
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}
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cleanup:
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mbedtls_mpi_free(&N);
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mbedtls_mpi_free(&RR);
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ret = ( ret != 0 ) ? MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED : 0;
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return( ret );
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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 p_limbs,
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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 = p_limbs;
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m->bits = mbedtls_mpi_core_bitlen( p, p_limbs );
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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.mm = mbedtls_mpi_core_montmul_init( m->p );
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ret = set_mont_const_square( &m->rep.mont.rr, m->p, m->limbs );
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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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/* BEGIN MERGE SLOT 1 */
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/* END MERGE SLOT 1 */
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/* BEGIN MERGE SLOT 2 */
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/* END MERGE SLOT 2 */
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/* BEGIN MERGE SLOT 3 */
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/* END MERGE SLOT 3 */
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/* BEGIN MERGE SLOT 4 */
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/* END MERGE SLOT 4 */
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/* BEGIN MERGE SLOT 5 */
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/* END MERGE SLOT 5 */
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/* BEGIN MERGE SLOT 6 */
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/* END MERGE SLOT 6 */
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/* BEGIN MERGE SLOT 7 */
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int mbedtls_mpi_mod_read( mbedtls_mpi_mod_residue *r,
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const mbedtls_mpi_mod_modulus *m,
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const unsigned char *buf,
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size_t buflen,
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mbedtls_mpi_mod_ext_rep ext_rep )
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{
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int ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
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/* Do our best to check if r and m have been set up */
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if( r->limbs == 0 || m->limbs == 0 )
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goto cleanup;
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if( r->limbs != m->limbs )
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goto cleanup;
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ret = mbedtls_mpi_mod_raw_read( r->p, m, buf, buflen, ext_rep );
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if( ret != 0 )
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goto cleanup;
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r->limbs = m->limbs;
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if( m->int_rep == MBEDTLS_MPI_MOD_REP_MONTGOMERY )
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ret = mbedtls_mpi_mod_raw_to_mont_rep( r->p, m );
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cleanup:
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return ( ret );
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}
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int mbedtls_mpi_mod_write( const mbedtls_mpi_mod_residue *r,
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const mbedtls_mpi_mod_modulus *m,
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unsigned char *buf,
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size_t buflen,
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mbedtls_mpi_mod_ext_rep ext_rep )
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{
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int ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
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/* Do our best to check if r and m have been set up */
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if( r->limbs == 0 || m->limbs == 0 )
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goto cleanup;
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if( r->limbs != m->limbs )
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goto cleanup;
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if( m->int_rep == MBEDTLS_MPI_MOD_REP_MONTGOMERY )
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{
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ret = mbedtls_mpi_mod_raw_from_mont_rep( r->p, m );
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if( ret != 0 )
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goto cleanup;
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}
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ret = mbedtls_mpi_mod_raw_write( r->p, m, buf, buflen, ext_rep );
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if( m->int_rep == MBEDTLS_MPI_MOD_REP_MONTGOMERY )
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{
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/* If this fails, the value of r is corrupted and we want to return
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* this error (as opposed to the error code from the write above) to
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* let the caller know. If it succeeds, we want to return the error
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* code from write above. */
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int conv_ret = mbedtls_mpi_mod_raw_to_mont_rep( r->p, m );
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if( ret == 0 )
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ret = conv_ret;
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}
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cleanup:
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return ( ret );
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}
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/* END MERGE SLOT 7 */
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/* BEGIN MERGE SLOT 8 */
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/* END MERGE SLOT 8 */
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/* BEGIN MERGE SLOT 9 */
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/* END MERGE SLOT 9 */
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/* BEGIN MERGE SLOT 10 */
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/* END MERGE SLOT 10 */
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#endif /* MBEDTLS_BIGNUM_C */
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