/* * Simple MPI demonstration program * * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later * * This file is provided under the Apache License 2.0, or the * GNU General Public License v2.0 or later. * * ********** * Apache License 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. * * ********** * * ********** * GNU General Public License v2.0 or later: * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * ********** */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include <stdio.h> #include <stdlib.h> #define mbedtls_printf printf #define mbedtls_exit exit #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE #endif /* MBEDTLS_PLATFORM_C */ #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_FS_IO) #include "mbedtls/bignum.h" #include <stdio.h> #endif #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_FS_IO) int main( void ) { mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_FS_IO not defined.\n"); mbedtls_exit( 0 ); } #else int main( void ) { int ret = 1; int exit_code = MBEDTLS_EXIT_FAILURE; mbedtls_mpi E, P, Q, N, H, D, X, Y, Z; mbedtls_mpi_init( &E ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &N ); mbedtls_mpi_init( &H ); mbedtls_mpi_init( &D ); mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &Z ); MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P, 10, "2789" ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &Q, 10, "3203" ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &E, 10, "257" ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &N, &P, &Q ) ); mbedtls_printf( "\n Public key:\n\n" ); MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " N = ", &N, 10, NULL ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " E = ", &E, 10, NULL ) ); mbedtls_printf( "\n Private key:\n\n" ); MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " P = ", &P, 10, NULL ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Q = ", &Q, 10, NULL ) ); #if defined(MBEDTLS_GENPRIME) MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P, &P, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q, &Q, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P, &Q ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &D, &E, &H ) ); mbedtls_mpi_write_file( " D = E^-1 mod (P-1)*(Q-1) = ", &D, 10, NULL ); #else mbedtls_printf("\nTest skipped (MBEDTLS_GENPRIME not defined).\n\n"); #endif MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &X, 10, "55555" ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Y, &X, &E, &N, NULL ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Z, &Y, &D, &N, NULL ) ); mbedtls_printf( "\n RSA operation:\n\n" ); MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " X (plaintext) = ", &X, 10, NULL ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Y (ciphertext) = X^E mod N = ", &Y, 10, NULL ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Z (decrypted) = Y^D mod N = ", &Z, 10, NULL ) ); mbedtls_printf( "\n" ); exit_code = MBEDTLS_EXIT_SUCCESS; cleanup: mbedtls_mpi_free( &E ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &N ); mbedtls_mpi_free( &H ); mbedtls_mpi_free( &D ); mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &Z ); if( exit_code != MBEDTLS_EXIT_SUCCESS ) { mbedtls_printf( "\nAn error occurred.\n" ); } #if defined(_WIN32) mbedtls_printf( " Press Enter to exit this program.\n" ); fflush( stdout ); getchar(); #endif mbedtls_exit( exit_code ); } #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_FS_IO */