2 * RSA/SHA-256 signature verification program
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
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
11 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 * This file is part of mbed TLS (https://tls.mbed.org)
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
25 #include MBEDTLS_CONFIG_FILE
28 #if defined(MBEDTLS_PLATFORM_C)
29 #include "mbedtls/platform.h"
33 #define mbedtls_printf printf
34 #define mbedtls_snprintf snprintf
35 #define mbedtls_exit exit
36 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
37 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
38 #endif /* MBEDTLS_PLATFORM_C */
40 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
41 !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
42 !defined(MBEDTLS_FS_IO)
45 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
46 "MBEDTLS_MD_C and/or "
47 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
52 #include "mbedtls/rsa.h"
53 #include "mbedtls/md.h"
58 #if defined(MBEDTLS_CHECK_PARAMS)
59 #include "mbedtls/platform_util.h"
60 void mbedtls_param_failed( const char *failure_condition,
64 mbedtls_printf( "%s:%i: Input param failed - %s\n",
65 file, line, failure_condition );
66 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
70 int main( int argc, char *argv[] )
74 int exit_code = MBEDTLS_EXIT_FAILURE;
76 mbedtls_rsa_context rsa;
77 unsigned char hash[32];
78 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
81 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
85 mbedtls_printf( "usage: rsa_verify <filename>\n" );
88 mbedtls_printf( "\n" );
94 mbedtls_printf( "\n . Reading public key from rsa_pub.txt" );
97 if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
99 mbedtls_printf( " failed\n ! Could not open rsa_pub.txt\n" \
100 " ! Please run rsa_genkey first\n\n" );
104 if( ( ret = mbedtls_mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
105 ( ret = mbedtls_mpi_read_file( &rsa.E, 16, f ) ) != 0 )
107 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret );
112 rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3;
117 * Extract the RSA signature from the text file
119 mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
121 if( ( f = fopen( filename, "rb" ) ) == NULL )
123 mbedtls_printf( "\n ! Could not open %s\n\n", filename );
128 while( fscanf( f, "%02X", &c ) > 0 &&
129 i < (int) sizeof( buf ) )
130 buf[i++] = (unsigned char) c;
136 mbedtls_printf( "\n ! Invalid RSA signature format\n\n" );
141 * Compute the SHA-256 hash of the input file and
142 * verify the signature
144 mbedtls_printf( "\n . Verifying the RSA/SHA-256 signature" );
147 if( ( ret = mbedtls_md_file(
148 mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
149 argv[1], hash ) ) != 0 )
151 mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[1] );
155 if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC,
156 MBEDTLS_MD_SHA256, 20, hash, buf ) ) != 0 )
158 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_verify returned -0x%0x\n\n", -ret );
162 mbedtls_printf( "\n . OK (the signature is valid)\n\n" );
164 exit_code = MBEDTLS_EXIT_SUCCESS;
168 mbedtls_rsa_free( &rsa );
171 mbedtls_printf( " + Press Enter to exit this program.\n" );
172 fflush( stdout ); getchar();
177 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&