166 lines
4.4 KiB
C
166 lines
4.4 KiB
C
/*
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* RSA simple data encryption program
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*
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* Copyright (C) 2006-2011, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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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(POLARSSL_CONFIG_FILE)
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#include "polarssl/config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#include <string.h>
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#include <stdio.h>
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#include "polarssl/rsa.h"
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#include "polarssl/entropy.h"
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#include "polarssl/ctr_drbg.h"
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#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_RSA_C) || \
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!defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_FS_IO) || \
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!defined(POLARSSL_CTR_DRBG_C)
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int main( int argc, char *argv[] )
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{
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((void) argc);
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((void) argv);
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printf("POLARSSL_BIGNUM_C and/or POLARSSL_RSA_C and/or "
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"POLARSSL_ENTROPY_C and/or POLARSSL_FS_IO and/or "
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"POLARSSL_CTR_DRBG_C not defined.\n");
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return( 0 );
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}
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#else
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int main( int argc, char *argv[] )
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{
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FILE *f;
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int ret;
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size_t i;
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rsa_context rsa;
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entropy_context entropy;
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ctr_drbg_context ctr_drbg;
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unsigned char input[1024];
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unsigned char buf[512];
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const char *pers = "rsa_encrypt";
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ret = 1;
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if( argc != 2 )
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{
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printf( "usage: rsa_encrypt <string of max 100 characters>\n" );
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#if defined(_WIN32)
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printf( "\n" );
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#endif
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goto exit;
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}
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printf( "\n . Seeding the random number generator..." );
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fflush( stdout );
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entropy_init( &entropy );
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if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen( pers ) ) ) != 0 )
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{
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printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
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goto exit;
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}
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printf( "\n . Reading public key from rsa_pub.txt" );
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fflush( stdout );
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if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
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{
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ret = 1;
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printf( " failed\n ! Could not open rsa_pub.txt\n" \
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" ! Please run rsa_genkey first\n\n" );
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goto exit;
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}
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rsa_init( &rsa, RSA_PKCS_V15, 0 );
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if( ( ret = mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
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( ret = mpi_read_file( &rsa.E, 16, f ) ) != 0 )
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{
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printf( " failed\n ! mpi_read_file returned %d\n\n", ret );
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goto exit;
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}
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rsa.len = ( mpi_msb( &rsa.N ) + 7 ) >> 3;
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fclose( f );
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if( strlen( argv[1] ) > 100 )
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{
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printf( " Input data larger than 100 characters.\n\n" );
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goto exit;
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}
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memcpy( input, argv[1], strlen( argv[1] ) );
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/*
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* Calculate the RSA encryption of the hash.
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*/
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printf( "\n . Generating the RSA encrypted value" );
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fflush( stdout );
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if( ( ret = rsa_pkcs1_encrypt( &rsa, ctr_drbg_random, &ctr_drbg,
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RSA_PUBLIC, strlen( argv[1] ),
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input, buf ) ) != 0 )
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{
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printf( " failed\n ! rsa_pkcs1_encrypt returned %d\n\n", ret );
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goto exit;
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}
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/*
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* Write the signature into result-enc.txt
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*/
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if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
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{
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ret = 1;
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printf( " failed\n ! Could not create %s\n\n", "result-enc.txt" );
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goto exit;
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}
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for( i = 0; i < rsa.len; i++ )
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fprintf( f, "%02X%s", buf[i],
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( i + 1 ) % 16 == 0 ? "\r\n" : " " );
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fclose( f );
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printf( "\n . Done (created \"%s\")\n\n", "result-enc.txt" );
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exit:
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entropy_free( &entropy );
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#if defined(_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( ret );
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}
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#endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_ENTROPY_C &&
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POLARSSL_FS_IO && POLARSSL_CTR_DRBG_C */
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