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