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Paul Bakker5121ce52009-01-03 21:22:43 +00001/*
Manuel Pégourié-Gonnard6f60cd82015-02-10 10:47:03 +00002 * RSA/SHA-256 signature verification program
Paul Bakker5121ce52009-01-03 21:22:43 +00003 *
Manuel Pégourié-Gonnard6fb81872015-07-27 11:11:48 +02004 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Manuel Pégourié-Gonnard37ff1402015-09-04 14:21:07 +02005 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
Paul Bakkerb96f1542010-07-18 20:36:00 +000018 *
Manuel Pégourié-Gonnardfe446432015-03-06 13:17:10 +000019 * This file is part of mbed TLS (https://tls.mbed.org)
Paul Bakker5121ce52009-01-03 21:22:43 +000020 */
21
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020022#if !defined(MBEDTLS_CONFIG_FILE)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000023#include "mbedtls/config.h"
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020024#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020025#include MBEDTLS_CONFIG_FILE
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020026#endif
Paul Bakker5121ce52009-01-03 21:22:43 +000027
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020028#if defined(MBEDTLS_PLATFORM_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000029#include "mbedtls/platform.h"
Rich Evansf90016a2015-01-19 14:26:37 +000030#else
Rich Evans18b78c72015-02-11 14:06:19 +000031#include <stdio.h>
Andres Amaya Garcia1e36af92018-04-29 20:27:09 +010032#include <stdlib.h>
33#define mbedtls_printf printf
34#define mbedtls_snprintf snprintf
Krzysztof Stachowiaka0865222019-04-24 14:24:46 +020035#define mbedtls_exit exit
Andres Amaya Garcia2b0599b2018-04-30 22:42:33 +010036#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
Andres Amaya Garcia1e36af92018-04-29 20:27:09 +010037#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
38#endif /* MBEDTLS_PLATFORM_C */
Rich Evansf90016a2015-01-19 14:26:37 +000039
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020040#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
Manuel Pégourié-Gonnard06d5d612015-05-28 16:23:18 +020041 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
42 !defined(MBEDTLS_FS_IO)
Rich Evans85b05ec2015-02-12 11:37:29 +000043int main( void )
Paul Bakker5690efc2011-05-26 13:16:06 +000044{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020045 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
Manuel Pégourié-Gonnard2ed05a02015-09-09 11:52:28 +020046 "MBEDTLS_MD_C and/or "
Manuel Pégourié-Gonnard06d5d612015-05-28 16:23:18 +020047 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
Krzysztof Stachowiaka0865222019-04-24 14:24:46 +020048 mbedtls_exit( 0 );
Paul Bakker5690efc2011-05-26 13:16:06 +000049}
50#else
Manuel Pégourié-Gonnard06d5d612015-05-28 16:23:18 +020051
52#include "mbedtls/rsa.h"
53#include "mbedtls/md.h"
54
55#include <stdio.h>
56#include <string.h>
57
Paul Bakker5121ce52009-01-03 21:22:43 +000058int main( int argc, char *argv[] )
59{
60 FILE *f;
Andres Amaya Garcia1e36af92018-04-29 20:27:09 +010061 int ret = 1, c;
62 int exit_code = MBEDTLS_EXIT_FAILURE;
Paul Bakker23986e52011-04-24 08:57:21 +000063 size_t i;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020064 mbedtls_rsa_context rsa;
Manuel Pégourié-Gonnard102a6202015-08-27 21:51:44 +020065 unsigned char hash[32];
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020066 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
Manuel Pégourié-Gonnardd74c6972015-08-27 21:39:40 +020067 char filename[512];
Paul Bakker5121ce52009-01-03 21:22:43 +000068
Janos Follathf713b0a2016-03-17 15:21:39 +000069 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
Janos Follathf713b0a2016-03-17 15:21:39 +000070
Paul Bakker5121ce52009-01-03 21:22:43 +000071 if( argc != 2 )
72 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020073 mbedtls_printf( "usage: rsa_verify <filename>\n" );
Paul Bakker5121ce52009-01-03 21:22:43 +000074
Paul Bakkercce9d772011-11-18 14:26:47 +000075#if defined(_WIN32)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020076 mbedtls_printf( "\n" );
Paul Bakker5121ce52009-01-03 21:22:43 +000077#endif
78
79 goto exit;
80 }
81
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020082 mbedtls_printf( "\n . Reading public key from rsa_pub.txt" );
Paul Bakker5121ce52009-01-03 21:22:43 +000083 fflush( stdout );
84
85 if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
86 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020087 mbedtls_printf( " failed\n ! Could not open rsa_pub.txt\n" \
Paul Bakker5121ce52009-01-03 21:22:43 +000088 " ! Please run rsa_genkey first\n\n" );
89 goto exit;
90 }
91
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020092 if( ( ret = mbedtls_mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
93 ( ret = mbedtls_mpi_read_file( &rsa.E, 16, f ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +000094 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020095 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret );
Janos Follath98e28a72016-05-31 14:03:54 +010096 fclose( f );
Paul Bakker5121ce52009-01-03 21:22:43 +000097 goto exit;
98 }
99
Manuel Pégourié-Gonnardc0696c22015-06-18 16:47:17 +0200100 rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3;
Paul Bakker5121ce52009-01-03 21:22:43 +0000101
102 fclose( f );
103
104 /*
105 * Extract the RSA signature from the text file
106 */
Manuel Pégourié-Gonnardd74c6972015-08-27 21:39:40 +0200107 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
Paul Bakker5121ce52009-01-03 21:22:43 +0000108
Manuel Pégourié-Gonnardd74c6972015-08-27 21:39:40 +0200109 if( ( f = fopen( filename, "rb" ) ) == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +0000110 {
Manuel Pégourié-Gonnardd74c6972015-08-27 21:39:40 +0200111 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
Paul Bakker5121ce52009-01-03 21:22:43 +0000112 goto exit;
113 }
114
Manuel Pégourié-Gonnardd74c6972015-08-27 21:39:40 +0200115 i = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +0000116 while( fscanf( f, "%02X", &c ) > 0 &&
117 i < (int) sizeof( buf ) )
118 buf[i++] = (unsigned char) c;
119
120 fclose( f );
121
122 if( i != rsa.len )
123 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200124 mbedtls_printf( "\n ! Invalid RSA signature format\n\n" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000125 goto exit;
126 }
127
128 /*
Manuel Pégourié-Gonnardce7a08b2015-08-27 21:59:58 +0200129 * Compute the SHA-256 hash of the input file and
130 * verify the signature
Paul Bakker5121ce52009-01-03 21:22:43 +0000131 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200132 mbedtls_printf( "\n . Verifying the RSA/SHA-256 signature" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000133 fflush( stdout );
134
Manuel Pégourié-Gonnard06d5d612015-05-28 16:23:18 +0200135 if( ( ret = mbedtls_md_file(
136 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
137 argv[1], hash ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000138 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200139 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[1] );
Paul Bakker5121ce52009-01-03 21:22:43 +0000140 goto exit;
141 }
142
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200143 if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC,
144 MBEDTLS_MD_SHA256, 20, hash, buf ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000145 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200146 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_verify returned -0x%0x\n\n", -ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000147 goto exit;
148 }
149
Manuel Pégourié-Gonnardce7a08b2015-08-27 21:59:58 +0200150 mbedtls_printf( "\n . OK (the signature is valid)\n\n" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000151
Andres Amaya Garcia1e36af92018-04-29 20:27:09 +0100152 exit_code = MBEDTLS_EXIT_SUCCESS;
Paul Bakker5121ce52009-01-03 21:22:43 +0000153
154exit:
155
Janos Follathf713b0a2016-03-17 15:21:39 +0000156 mbedtls_rsa_free( &rsa );
157
Paul Bakkercce9d772011-11-18 14:26:47 +0000158#if defined(_WIN32)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200159 mbedtls_printf( " + Press Enter to exit this program.\n" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000160 fflush( stdout ); getchar();
161#endif
162
Krzysztof Stachowiaka0865222019-04-24 14:24:46 +0200163 mbedtls_exit( exit_code );
Paul Bakker5121ce52009-01-03 21:22:43 +0000164}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200165#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
166 MBEDTLS_FS_IO */