222 lines
6.9 KiB
C
222 lines
6.9 KiB
C
/*
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* RSA simple decryption program
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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#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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#include <stdlib.h>
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#define mbedtls_printf printf
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#define mbedtls_exit exit
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif
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#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \
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defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_CTR_DRBG_C)
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#include "mbedtls/rsa.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <string.h>
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#endif
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
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!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_CTR_DRBG_C)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
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"MBEDTLS_FS_IO and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_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 return_val, exit_val, c;
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size_t i;
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mbedtls_rsa_context rsa;
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mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
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mbedtls_entropy_context entropy;
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mbedtls_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 = "rsa_decrypt";
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((void) argv);
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memset(result, 0, sizeof( result ) );
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exit_val = MBEDTLS_EXIT_SUCCESS;
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if( argc != 1 )
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{
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mbedtls_printf( "usage: rsa_decrypt\n" );
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#if defined(_WIN32)
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mbedtls_printf( "\n" );
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#endif
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mbedtls_exit( MBEDTLS_EXIT_FAILURE );
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}
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mbedtls_printf( "\n . Seeding the random number generator..." );
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fflush( stdout );
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mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
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mbedtls_ctr_drbg_init( &ctr_drbg );
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mbedtls_entropy_init( &entropy );
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mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
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mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
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mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
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return_val = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
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&entropy, (const unsigned char *) pers,
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strlen( pers ) );
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if( return_val != 0 )
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{
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exit_val = MBEDTLS_EXIT_FAILURE;
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mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n",
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return_val );
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goto exit;
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}
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mbedtls_printf( "\n . Reading private key from rsa_priv.txt" );
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fflush( stdout );
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if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
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{
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exit_val = MBEDTLS_EXIT_FAILURE;
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mbedtls_printf( " failed\n ! Could not open rsa_priv.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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if( ( return_val = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
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( return_val = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
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( return_val = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
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( return_val = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
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( return_val = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 ||
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( return_val = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 ||
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( return_val = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 ||
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( return_val = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 )
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{
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exit_val = MBEDTLS_EXIT_FAILURE;
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mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n",
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return_val );
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fclose( f );
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goto exit;
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}
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fclose( f );
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if( ( return_val = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n",
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return_val );
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goto exit;
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}
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if( ( return_val = mbedtls_rsa_complete( &rsa, mbedtls_ctr_drbg_random,
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&ctr_drbg ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_complete returned %d\n\n",
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return_val );
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goto exit;
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}
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/* Although we're not using them, verify CRT parameters */
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if( ( return_val = mbedtls_rsa_check_crt( &rsa, &DP, &DQ, &QP ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_check_crt returned %d\n\n",
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return_val );
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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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if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
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{
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exit_val = MBEDTLS_EXIT_FAILURE;
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mbedtls_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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if( i != rsa.len )
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{
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exit_val = MBEDTLS_EXIT_FAILURE;
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mbedtls_printf( "\n ! Invalid RSA signature format\n\n" );
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goto exit;
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}
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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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mbedtls_printf( "\n . Decrypting the encrypted data" );
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fflush( stdout );
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return_val = mbedtls_rsa_pkcs1_decrypt( &rsa, mbedtls_ctr_drbg_random,
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&ctr_drbg, MBEDTLS_RSA_PRIVATE, &i,
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buf, result, 1024 );
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if( return_val != 0 )
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{
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exit_val = MBEDTLS_EXIT_FAILURE;
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mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_decrypt returned %d\n\n",
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return_val );
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goto exit;
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}
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mbedtls_printf( "\n . OK\n\n" );
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mbedtls_printf( "The decrypted result is: '%s'\n\n", result );
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exit:
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mbedtls_ctr_drbg_free( &ctr_drbg );
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mbedtls_entropy_free( &entropy );
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mbedtls_rsa_free( &rsa );
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mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
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mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
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mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
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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( exit_val );
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_FS_IO */
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