113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/*
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* Low-level 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/error.h"
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#include "mbedtls/platform_util.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_raw.h"
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#include "bignum_mod.h"
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#include "constant_time_internal.h"
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void mbedtls_mpi_mod_raw_cond_assign( mbedtls_mpi_uint *X,
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const mbedtls_mpi_uint *A,
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const mbedtls_mpi_mod_modulus *N,
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unsigned char assign )
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{
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mbedtls_mpi_core_cond_assign( X, A, N->limbs, assign );
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}
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void mbedtls_mpi_mod_raw_cond_swap( mbedtls_mpi_uint *X,
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mbedtls_mpi_uint *Y,
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const mbedtls_mpi_mod_modulus *N,
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unsigned char swap )
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{
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mbedtls_mpi_core_cond_swap( X, Y, N->limbs, swap );
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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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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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switch( m->ext_rep )
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{
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case MBEDTLS_MPI_MOD_EXT_REP_LE:
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ret = mbedtls_mpi_core_read_le( X, m->limbs,
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input, input_length );
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break;
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case MBEDTLS_MPI_MOD_EXT_REP_BE:
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ret = mbedtls_mpi_core_read_be( X, m->limbs,
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input, input_length );
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break;
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default:
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return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
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}
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if( ret != 0 )
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goto cleanup;
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if( !mbedtls_mpi_core_lt_ct( X, m->p, m->limbs ) )
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{
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ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
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goto cleanup;
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}
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cleanup:
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return( ret );
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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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{
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switch( m->ext_rep )
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{
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case MBEDTLS_MPI_MOD_EXT_REP_LE:
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return( mbedtls_mpi_core_write_le( A, m->limbs,
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output, output_length ) );
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case MBEDTLS_MPI_MOD_EXT_REP_BE:
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return( mbedtls_mpi_core_write_be( A, m->limbs,
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output, output_length ) );
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default:
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return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
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}
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}
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#endif /* MBEDTLS_BIGNUM_C */
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