2009-01-03 22:22:43 +01:00
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/*
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* Simple MPI demonstration program
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*
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* Copyright (C) 2006-2007 Christophe Devine
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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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#ifndef _CRT_SECURE_NO_DEPRECATE
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#define _CRT_SECURE_NO_DEPRECATE 1
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#endif
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#include <stdio.h>
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2009-01-03 22:51:57 +01:00
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#include "polarssl/bignum.h"
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2009-01-03 22:22:43 +01:00
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int main( void )
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{
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mpi E, P, Q, N, H, D, X, Y, Z;
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mpi_init( &E, &P, &Q, &N, &H,
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&D, &X, &Y, &Z, NULL );
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mpi_read_string( &P, 10, "2789" );
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mpi_read_string( &Q, 10, "3203" );
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mpi_read_string( &E, 10, "257" );
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mpi_mul_mpi( &N, &P, &Q );
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printf( "\n Public key:\n\n" );
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mpi_write_file( " N = ", &N, 10, NULL );
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mpi_write_file( " E = ", &E, 10, NULL );
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printf( "\n Private key:\n\n" );
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mpi_write_file( " P = ", &P, 10, NULL );
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mpi_write_file( " Q = ", &Q, 10, NULL );
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mpi_sub_int( &P, &P, 1 );
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mpi_sub_int( &Q, &Q, 1 );
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mpi_mul_mpi( &H, &P, &Q );
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mpi_inv_mod( &D, &E, &H );
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mpi_write_file( " D = E^-1 mod (P-1)*(Q-1) = ",
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&D, 10, NULL );
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mpi_read_string( &X, 10, "55555" );
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mpi_exp_mod( &Y, &X, &E, &N, NULL );
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mpi_exp_mod( &Z, &Y, &D, &N, NULL );
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printf( "\n RSA operation:\n\n" );
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mpi_write_file( " X (plaintext) = ", &X, 10, NULL );
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mpi_write_file( " Y (ciphertext) = X^E mod N = ", &Y, 10, NULL );
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mpi_write_file( " Z (decrypted) = Y^D mod N = ", &Z, 10, NULL );
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printf( "\n" );
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mpi_free( &Z, &Y, &X, &D, &H,
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&N, &Q, &P, &E, NULL );
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#ifdef WIN32
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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( 0 );
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}
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