163 lines
4.3 KiB
C
163 lines
4.3 KiB
C
/*
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* Public key-based simple decryption program
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*
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* Copyright (C) 2006-2013, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://www.polarssl.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(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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#if defined(POLARSSL_PLATFORM_C)
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#include "polarssl/platform.h"
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#else
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#define polarssl_printf printf
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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/error.h"
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#include "polarssl/pk.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_PK_PARSE_C) || \
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!defined(POLARSSL_FS_IO) || !defined(POLARSSL_ENTROPY_C) || \
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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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polarssl_printf("POLARSSL_BIGNUM_C and/or POLARSSL_PK_PARSE_C and/or "
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"POLARSSL_FS_IO and/or POLARSSL_ENTROPY_C 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, c;
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size_t i, olen = 0;
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pk_context pk;
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entropy_context entropy;
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ctr_drbg_context ctr_drbg;
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unsigned char result[1024];
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unsigned char buf[512];
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const char *pers = "pk_decrypt";
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((void) argv);
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memset(result, 0, sizeof( result ) );
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ret = 1;
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if( argc != 2 )
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{
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polarssl_printf( "usage: pk_decrypt <key_file>\n" );
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#if defined(_WIN32)
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polarssl_printf( "\n" );
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#endif
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goto exit;
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}
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polarssl_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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polarssl_printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
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goto exit;
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}
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polarssl_printf( "\n . Reading private key from '%s'", argv[1] );
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fflush( stdout );
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pk_init( &pk );
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if( ( ret = pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
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{
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polarssl_printf( " failed\n ! pk_parse_keyfile returned -0x%04x\n", -ret );
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goto exit;
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}
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/*
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* Extract the RSA encrypted value from the text file
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*/
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ret = 1;
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if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
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{
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polarssl_printf( "\n ! Could not open %s\n\n", "result-enc.txt" );
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goto exit;
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}
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i = 0;
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while( fscanf( f, "%02X", &c ) > 0 &&
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i < (int) sizeof( buf ) )
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buf[i++] = (unsigned char) c;
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fclose( f );
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/*
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* Decrypt the encrypted RSA data and print the result.
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*/
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polarssl_printf( "\n . Decrypting the encrypted data" );
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fflush( stdout );
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if( ( ret = pk_decrypt( &pk, buf, i, result, &olen, sizeof(result),
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ctr_drbg_random, &ctr_drbg ) ) != 0 )
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{
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polarssl_printf( " failed\n ! pk_decrypt returned -0x%04x\n", -ret );
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goto exit;
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}
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polarssl_printf( "\n . OK\n\n" );
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polarssl_printf( "The decrypted result is: '%s'\n\n", result );
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ret = 0;
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exit:
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ctr_drbg_free( &ctr_drbg );
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entropy_free( &entropy );
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#if defined(POLARSSL_ERROR_C)
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polarssl_strerror( ret, (char *) buf, sizeof(buf) );
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polarssl_printf( " ! Last error was: %s\n", buf );
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#endif
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#if defined(_WIN32)
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polarssl_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_PK_PARSE_C && POLARSSL_FS_IO &&
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POLARSSL_ENTROPY_C && POLARSSL_CTR_DRBG_C */
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