mirror of
https://github.com/Mbed-TLS/mbedtls.git
synced 2024-12-28 06:19:27 +00:00
111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
/*
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* Simple MPI demonstration program
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*
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* Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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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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#define mbedtls_printf printf
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#endif
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#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_FS_IO)
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#include "mbedtls/bignum.h"
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#include <stdio.h>
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#endif
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_FS_IO)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_FS_IO not defined.\n");
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return( 0 );
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}
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#else
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int main( void )
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{
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int ret;
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mbedtls_mpi E, P, Q, N, H, D, X, Y, Z;
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mbedtls_mpi_init( &E ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &N );
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mbedtls_mpi_init( &H ); mbedtls_mpi_init( &D ); mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
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mbedtls_mpi_init( &Z );
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P, 10, "2789" ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &Q, 10, "3203" ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &E, 10, "257" ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &N, &P, &Q ) );
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mbedtls_printf( "\n Public key:\n\n" );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " N = ", &N, 10, NULL ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " E = ", &E, 10, NULL ) );
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mbedtls_printf( "\n Private key:\n\n" );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " P = ", &P, 10, NULL ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Q = ", &Q, 10, NULL ) );
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#if defined(MBEDTLS_GENPRIME)
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MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P, &P, 1 ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q, &Q, 1 ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P, &Q ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &D, &E, &H ) );
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mbedtls_mpi_write_file( " D = E^-1 mod (P-1)*(Q-1) = ",
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&D, 10, NULL );
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#else
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mbedtls_printf("\nTest skipped (MBEDTLS_GENPRIME not defined).\n\n");
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#endif
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &X, 10, "55555" ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Y, &X, &E, &N, NULL ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Z, &Y, &D, &N, NULL ) );
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mbedtls_printf( "\n RSA operation:\n\n" );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " X (plaintext) = ", &X, 10, NULL ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Y (ciphertext) = X^E mod N = ", &Y, 10, NULL ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Z (decrypted) = Y^D mod N = ", &Z, 10, NULL ) );
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mbedtls_printf( "\n" );
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cleanup:
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mbedtls_mpi_free( &E ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &N );
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mbedtls_mpi_free( &H ); mbedtls_mpi_free( &D ); mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
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mbedtls_mpi_free( &Z );
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if( ret != 0 )
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{
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mbedtls_printf( "\nAn error occured.\n" );
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ret = 1;
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}
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#if defined(_WIN32)
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mbedtls_printf( " Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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return( ret );
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_FS_IO */
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