1 /*
2 * generic message digest layer demonstration program
3 *
4 * Copyright The Mbed TLS Contributors
5 * 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.
18 */
19
20 #include "mbedtls/build_info.h"
21
22 #if defined(MBEDTLS_PLATFORM_C)
23 #include "mbedtls/platform.h"
24 #else
25 #include <stdio.h>
26 #include <stdlib.h>
27 #define mbedtls_fprintf fprintf
28 #define mbedtls_printf printf
29 #define mbedtls_exit exit
30 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
31 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
32 #endif /* MBEDTLS_PLATFORM_C */
33
34 #if defined(MBEDTLS_MD_C) && defined(MBEDTLS_FS_IO)
35 #include "mbedtls/md.h"
36
37 #include <stdio.h>
38 #include <string.h>
39 #endif
40
41 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_FS_IO)
main(void)42 int main( void )
43 {
44 mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_FS_IO not defined.\n");
45 mbedtls_exit( 0 );
46 }
47 #else
48
49
generic_wrapper(const mbedtls_md_info_t * md_info,char * filename,unsigned char * sum)50 static int generic_wrapper( const mbedtls_md_info_t *md_info, char *filename, unsigned char *sum )
51 {
52 int ret = mbedtls_md_file( md_info, filename, sum );
53
54 if( ret == 1 )
55 mbedtls_fprintf( stderr, "failed to open: %s\n", filename );
56
57 if( ret == 2 )
58 mbedtls_fprintf( stderr, "failed to read: %s\n", filename );
59
60 return( ret );
61 }
62
generic_print(const mbedtls_md_info_t * md_info,char * filename)63 static int generic_print( const mbedtls_md_info_t *md_info, char *filename )
64 {
65 int i;
66 unsigned char sum[MBEDTLS_MD_MAX_SIZE];
67
68 if( generic_wrapper( md_info, filename, sum ) != 0 )
69 return( 1 );
70
71 for( i = 0; i < mbedtls_md_get_size( md_info ); i++ )
72 mbedtls_printf( "%02x", sum[i] );
73
74 mbedtls_printf( " %s\n", filename );
75 return( 0 );
76 }
77
generic_check(const mbedtls_md_info_t * md_info,char * filename)78 static int generic_check( const mbedtls_md_info_t *md_info, char *filename )
79 {
80 int i;
81 size_t n;
82 FILE *f;
83 int nb_err1, nb_err2;
84 int nb_tot1, nb_tot2;
85 unsigned char sum[MBEDTLS_MD_MAX_SIZE];
86 char line[1024];
87 char diff;
88 #if defined(__clang_analyzer__)
89 char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1] = { };
90 #else
91 char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1];
92 #endif
93
94 if( ( f = fopen( filename, "rb" ) ) == NULL )
95 {
96 mbedtls_printf( "failed to open: %s\n", filename );
97 return( 1 );
98 }
99
100 nb_err1 = nb_err2 = 0;
101 nb_tot1 = nb_tot2 = 0;
102
103 memset( line, 0, sizeof( line ) );
104
105 n = sizeof( line );
106
107 while( fgets( line, (int) n - 1, f ) != NULL )
108 {
109 n = strlen( line );
110
111 if( n < (size_t) 2 * mbedtls_md_get_size( md_info ) + 4 )
112 {
113 mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name( md_info ));
114 continue;
115 }
116
117 if( line[2 * mbedtls_md_get_size( md_info )] != ' ' || line[2 * mbedtls_md_get_size( md_info ) + 1] != ' ' )
118 {
119 mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name( md_info ));
120 continue;
121 }
122
123 if( line[n - 1] == '\n' ) { n--; line[n] = '\0'; }
124 if( line[n - 1] == '\r' ) { n--; line[n] = '\0'; }
125
126 nb_tot1++;
127
128 if( generic_wrapper( md_info, line + 2 + 2 * mbedtls_md_get_size( md_info ), sum ) != 0 )
129 {
130 nb_err1++;
131 continue;
132 }
133
134 nb_tot2++;
135
136 for( i = 0; i < mbedtls_md_get_size( md_info ); i++ )
137 sprintf( buf + i * 2, "%02x", sum[i] );
138
139 /* Use constant-time buffer comparison */
140 diff = 0;
141 for( i = 0; i < 2 * mbedtls_md_get_size( md_info ); i++ )
142 diff |= line[i] ^ buf[i];
143
144 if( diff != 0 )
145 {
146 nb_err2++;
147 mbedtls_fprintf( stderr, "wrong checksum: %s\n", line + 66 );
148 }
149
150 n = sizeof( line );
151 }
152
153 if( nb_err1 != 0 )
154 {
155 mbedtls_printf( "WARNING: %d (out of %d) input files could "
156 "not be read\n", nb_err1, nb_tot1 );
157 }
158
159 if( nb_err2 != 0 )
160 {
161 mbedtls_printf( "WARNING: %d (out of %d) computed checksums did "
162 "not match\n", nb_err2, nb_tot2 );
163 }
164
165 fclose( f );
166
167 return( nb_err1 != 0 || nb_err2 != 0 );
168 }
169
main(int argc,char * argv[])170 int main( int argc, char *argv[] )
171 {
172 int ret = 1, i;
173 int exit_code = MBEDTLS_EXIT_FAILURE;
174 const mbedtls_md_info_t *md_info;
175 mbedtls_md_context_t md_ctx;
176
177 mbedtls_md_init( &md_ctx );
178
179 if( argc == 1 )
180 {
181 const int *list;
182
183 mbedtls_printf( "print mode: generic_sum <mbedtls_md> <file> <file> ...\n" );
184 mbedtls_printf( "check mode: generic_sum <mbedtls_md> -c <checksum file>\n" );
185
186 mbedtls_printf( "\nAvailable message digests:\n" );
187 list = mbedtls_md_list();
188 while( *list )
189 {
190 md_info = mbedtls_md_info_from_type( *list );
191 mbedtls_printf( " %s\n", mbedtls_md_get_name( md_info ) );
192 list++;
193 }
194
195 #if defined(_WIN32)
196 mbedtls_printf( "\n Press Enter to exit this program.\n" );
197 fflush( stdout ); getchar();
198 #endif
199
200 mbedtls_exit( exit_code );
201 }
202
203 /*
204 * Read the MD from the command line
205 */
206 md_info = mbedtls_md_info_from_string( argv[1] );
207 if( md_info == NULL )
208 {
209 mbedtls_fprintf( stderr, "Message Digest '%s' not found\n", argv[1] );
210 mbedtls_exit( exit_code );
211 }
212 if( mbedtls_md_setup( &md_ctx, md_info, 0 ) )
213 {
214 mbedtls_fprintf( stderr, "Failed to initialize context.\n" );
215 mbedtls_exit( exit_code );
216 }
217
218 ret = 0;
219 if( argc == 4 && strcmp( "-c", argv[2] ) == 0 )
220 {
221 ret |= generic_check( md_info, argv[3] );
222 goto exit;
223 }
224
225 for( i = 2; i < argc; i++ )
226 ret |= generic_print( md_info, argv[i] );
227
228 if ( ret == 0 )
229 exit_code = MBEDTLS_EXIT_SUCCESS;
230
231 exit:
232 mbedtls_md_free( &md_ctx );
233
234 mbedtls_exit( exit_code );
235 }
236 #endif /* MBEDTLS_MD_C && MBEDTLS_FS_IO */
237