1 /*
2 * Key writing application
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
24 #else
25 #include MBEDTLS_CONFIG_FILE
26 #endif
27
28 #if defined(MBEDTLS_PLATFORM_C)
29 #include "mbedtls/platform.h"
30 #else
31 #include <stdio.h>
32 #include <stdlib.h>
33 #define mbedtls_printf printf
34 #define mbedtls_exit exit
35 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
36 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
37 #endif /* MBEDTLS_PLATFORM_C */
38
39 #if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO)
40 #include "mbedtls/error.h"
41 #include "mbedtls/pk.h"
42 #include "mbedtls/error.h"
43
44 #include <stdio.h>
45 #include <string.h>
46 #endif
47
48 #if defined(MBEDTLS_PEM_WRITE_C)
49 #define USAGE_OUT \
50 " output_file=%%s default: keyfile.pem\n" \
51 " output_format=pem|der default: pem\n"
52 #else
53 #define USAGE_OUT \
54 " output_file=%%s default: keyfile.der\n" \
55 " output_format=der default: der\n"
56 #endif
57
58 #if defined(MBEDTLS_PEM_WRITE_C)
59 #define DFL_OUTPUT_FILENAME "keyfile.pem"
60 #define DFL_OUTPUT_FORMAT OUTPUT_FORMAT_PEM
61 #else
62 #define DFL_OUTPUT_FILENAME "keyfile.der"
63 #define DFL_OUTPUT_FORMAT OUTPUT_FORMAT_DER
64 #endif
65
66 #define DFL_MODE MODE_NONE
67 #define DFL_FILENAME "keyfile.key"
68 #define DFL_DEBUG_LEVEL 0
69 #define DFL_OUTPUT_MODE OUTPUT_MODE_NONE
70
71 #define MODE_NONE 0
72 #define MODE_PRIVATE 1
73 #define MODE_PUBLIC 2
74
75 #define OUTPUT_MODE_NONE 0
76 #define OUTPUT_MODE_PRIVATE 1
77 #define OUTPUT_MODE_PUBLIC 2
78
79 #define OUTPUT_FORMAT_PEM 0
80 #define OUTPUT_FORMAT_DER 1
81
82 #define USAGE \
83 "\n usage: key_app_writer param=<>...\n" \
84 "\n acceptable parameters:\n" \
85 " mode=private|public default: none\n" \
86 " filename=%%s default: keyfile.key\n" \
87 " output_mode=private|public default: none\n" \
88 USAGE_OUT \
89 "\n"
90
91 #if !defined(MBEDTLS_PK_PARSE_C) || \
92 !defined(MBEDTLS_PK_WRITE_C) || \
93 !defined(MBEDTLS_FS_IO)
main(void)94 int main( void )
95 {
96 mbedtls_printf( "MBEDTLS_PK_PARSE_C and/or MBEDTLS_PK_WRITE_C and/or MBEDTLS_FS_IO not defined.\n" );
97 return( 0 );
98 }
99 #else
100
101 #if defined(MBEDTLS_CHECK_PARAMS)
102 #include "mbedtls/platform_util.h"
mbedtls_param_failed(const char * failure_condition,const char * file,int line)103 void mbedtls_param_failed( const char *failure_condition,
104 const char *file,
105 int line )
106 {
107 mbedtls_printf( "%s:%i: Input param failed - %s\n",
108 file, line, failure_condition );
109 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
110 }
111 #endif
112
113 /*
114 * global options
115 */
116 struct options
117 {
118 int mode; /* the mode to run the application in */
119 const char *filename; /* filename of the key file */
120 int output_mode; /* the output mode to use */
121 const char *output_file; /* where to store the constructed key file */
122 int output_format; /* the output format to use */
123 } opt;
124
write_public_key(mbedtls_pk_context * key,const char * output_file)125 static int write_public_key( mbedtls_pk_context *key, const char *output_file )
126 {
127 int ret;
128 FILE *f;
129 unsigned char output_buf[16000];
130 unsigned char *c = output_buf;
131 size_t len = 0;
132
133 memset(output_buf, 0, 16000);
134
135 #if defined(MBEDTLS_PEM_WRITE_C)
136 if( opt.output_format == OUTPUT_FORMAT_PEM )
137 {
138 if( ( ret = mbedtls_pk_write_pubkey_pem( key, output_buf, 16000 ) ) != 0 )
139 return( ret );
140
141 len = strlen( (char *) output_buf );
142 }
143 else
144 #endif
145 {
146 if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf, 16000 ) ) < 0 )
147 return( ret );
148
149 len = ret;
150 c = output_buf + sizeof(output_buf) - len;
151 }
152
153 if( ( f = fopen( output_file, "w" ) ) == NULL )
154 return( -1 );
155
156 if( fwrite( c, 1, len, f ) != len )
157 {
158 fclose( f );
159 return( -1 );
160 }
161
162 fclose( f );
163
164 return( 0 );
165 }
166
write_private_key(mbedtls_pk_context * key,const char * output_file)167 static int write_private_key( mbedtls_pk_context *key, const char *output_file )
168 {
169 int ret;
170 FILE *f;
171 unsigned char output_buf[16000];
172 unsigned char *c = output_buf;
173 size_t len = 0;
174
175 memset(output_buf, 0, 16000);
176
177 #if defined(MBEDTLS_PEM_WRITE_C)
178 if( opt.output_format == OUTPUT_FORMAT_PEM )
179 {
180 if( ( ret = mbedtls_pk_write_key_pem( key, output_buf, 16000 ) ) != 0 )
181 return( ret );
182
183 len = strlen( (char *) output_buf );
184 }
185 else
186 #endif
187 {
188 if( ( ret = mbedtls_pk_write_key_der( key, output_buf, 16000 ) ) < 0 )
189 return( ret );
190
191 len = ret;
192 c = output_buf + sizeof(output_buf) - len - 1;
193 }
194
195 if( ( f = fopen( output_file, "w" ) ) == NULL )
196 return( -1 );
197
198 if( fwrite( c, 1, len, f ) != len )
199 {
200 fclose( f );
201 return( -1 );
202 }
203
204 fclose( f );
205
206 return( 0 );
207 }
208
main(int argc,char * argv[])209 int main( int argc, char *argv[] )
210 {
211 int ret = 1;
212 int exit_code = MBEDTLS_EXIT_FAILURE;
213 char buf[1024];
214 int i;
215 char *p, *q;
216
217 mbedtls_pk_context key;
218 mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
219
220 /*
221 * Set to sane values
222 */
223 mbedtls_pk_init( &key );
224 memset( buf, 0, sizeof( buf ) );
225
226 mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
227 mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
228 mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
229
230 if( argc == 0 )
231 {
232 usage:
233 mbedtls_printf( USAGE );
234 goto exit;
235 }
236
237 opt.mode = DFL_MODE;
238 opt.filename = DFL_FILENAME;
239 opt.output_mode = DFL_OUTPUT_MODE;
240 opt.output_file = DFL_OUTPUT_FILENAME;
241 opt.output_format = DFL_OUTPUT_FORMAT;
242
243 for( i = 1; i < argc; i++ )
244 {
245 p = argv[i];
246 if( ( q = strchr( p, '=' ) ) == NULL )
247 goto usage;
248 *q++ = '\0';
249
250 if( strcmp( p, "mode" ) == 0 )
251 {
252 if( strcmp( q, "private" ) == 0 )
253 opt.mode = MODE_PRIVATE;
254 else if( strcmp( q, "public" ) == 0 )
255 opt.mode = MODE_PUBLIC;
256 else
257 goto usage;
258 }
259 else if( strcmp( p, "output_mode" ) == 0 )
260 {
261 if( strcmp( q, "private" ) == 0 )
262 opt.output_mode = OUTPUT_MODE_PRIVATE;
263 else if( strcmp( q, "public" ) == 0 )
264 opt.output_mode = OUTPUT_MODE_PUBLIC;
265 else
266 goto usage;
267 }
268 else if( strcmp( p, "output_format" ) == 0 )
269 {
270 #if defined(MBEDTLS_PEM_WRITE_C)
271 if( strcmp( q, "pem" ) == 0 )
272 opt.output_format = OUTPUT_FORMAT_PEM;
273 else
274 #endif
275 if( strcmp( q, "der" ) == 0 )
276 opt.output_format = OUTPUT_FORMAT_DER;
277 else
278 goto usage;
279 }
280 else if( strcmp( p, "filename" ) == 0 )
281 opt.filename = q;
282 else if( strcmp( p, "output_file" ) == 0 )
283 opt.output_file = q;
284 else
285 goto usage;
286 }
287
288 if( opt.mode == MODE_NONE && opt.output_mode != OUTPUT_MODE_NONE )
289 {
290 mbedtls_printf( "\nCannot output a key without reading one.\n");
291 goto exit;
292 }
293
294 if( opt.mode == MODE_PUBLIC && opt.output_mode == OUTPUT_MODE_PRIVATE )
295 {
296 mbedtls_printf( "\nCannot output a private key from a public key.\n");
297 goto exit;
298 }
299
300 if( opt.mode == MODE_PRIVATE )
301 {
302 /*
303 * 1.1. Load the key
304 */
305 mbedtls_printf( "\n . Loading the private key ..." );
306 fflush( stdout );
307
308 ret = mbedtls_pk_parse_keyfile( &key, opt.filename, NULL );
309
310 if( ret != 0 )
311 {
312 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
313 mbedtls_printf( " failed\n ! mbedtls_pk_parse_keyfile returned -0x%04x - %s\n\n", -ret, buf );
314 goto exit;
315 }
316
317 mbedtls_printf( " ok\n" );
318
319 /*
320 * 1.2 Print the key
321 */
322 mbedtls_printf( " . Key information ...\n" );
323
324 #if defined(MBEDTLS_RSA_C)
325 if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_RSA )
326 {
327 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( key );
328
329 if( ( ret = mbedtls_rsa_export ( rsa, &N, &P, &Q, &D, &E ) ) != 0 ||
330 ( ret = mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP ) ) != 0 )
331 {
332 mbedtls_printf( " failed\n ! could not export RSA parameters\n\n" );
333 goto exit;
334 }
335
336 mbedtls_mpi_write_file( "N: ", &N, 16, NULL );
337 mbedtls_mpi_write_file( "E: ", &E, 16, NULL );
338 mbedtls_mpi_write_file( "D: ", &D, 16, NULL );
339 mbedtls_mpi_write_file( "P: ", &P, 16, NULL );
340 mbedtls_mpi_write_file( "Q: ", &Q, 16, NULL );
341 mbedtls_mpi_write_file( "DP: ", &DP, 16, NULL );
342 mbedtls_mpi_write_file( "DQ: ", &DQ, 16, NULL );
343 mbedtls_mpi_write_file( "QP: ", &QP, 16, NULL );
344 }
345 else
346 #endif
347 #if defined(MBEDTLS_ECP_C)
348 if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
349 {
350 mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
351 mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL );
352 mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
353 mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );
354 mbedtls_mpi_write_file( "D : ", &ecp->d , 16, NULL );
355 }
356 else
357 #endif
358 mbedtls_printf("key type not supported yet\n");
359
360 }
361 else if( opt.mode == MODE_PUBLIC )
362 {
363 /*
364 * 1.1. Load the key
365 */
366 mbedtls_printf( "\n . Loading the public key ..." );
367 fflush( stdout );
368
369 ret = mbedtls_pk_parse_public_keyfile( &key, opt.filename );
370
371 if( ret != 0 )
372 {
373 mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
374 mbedtls_printf( " failed\n ! mbedtls_pk_parse_public_key returned -0x%04x - %s\n\n", -ret, buf );
375 goto exit;
376 }
377
378 mbedtls_printf( " ok\n" );
379
380 /*
381 * 1.2 Print the key
382 */
383 mbedtls_printf( " . Key information ...\n" );
384
385 #if defined(MBEDTLS_RSA_C)
386 if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_RSA )
387 {
388 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( key );
389
390 if( ( ret = mbedtls_rsa_export( rsa, &N, NULL, NULL,
391 NULL, &E ) ) != 0 )
392 {
393 mbedtls_printf( " failed\n ! could not export RSA parameters\n\n" );
394 goto exit;
395 }
396 mbedtls_mpi_write_file( "N: ", &N, 16, NULL );
397 mbedtls_mpi_write_file( "E: ", &E, 16, NULL );
398 }
399 else
400 #endif
401 #if defined(MBEDTLS_ECP_C)
402 if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
403 {
404 mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
405 mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL );
406 mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
407 mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );
408 }
409 else
410 #endif
411 mbedtls_printf("key type not supported yet\n");
412 }
413 else
414 goto usage;
415
416 if( opt.output_mode == OUTPUT_MODE_PUBLIC )
417 {
418 write_public_key( &key, opt.output_file );
419 }
420 if( opt.output_mode == OUTPUT_MODE_PRIVATE )
421 {
422 write_private_key( &key, opt.output_file );
423 }
424
425 exit_code = MBEDTLS_EXIT_SUCCESS;
426
427 exit:
428
429 if( exit_code != MBEDTLS_EXIT_SUCCESS )
430 {
431 #ifdef MBEDTLS_ERROR_C
432 mbedtls_strerror( ret, buf, sizeof( buf ) );
433 mbedtls_printf( " - %s\n", buf );
434 #else
435 mbedtls_printf("\n");
436 #endif
437 }
438
439 mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
440 mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
441 mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
442
443 mbedtls_pk_free( &key );
444
445 #if defined(_WIN32)
446 mbedtls_printf( " + Press Enter to exit this program.\n" );
447 fflush( stdout ); getchar();
448 #endif
449
450 return( exit_code );
451 }
452 #endif /* MBEDTLS_PK_PARSE_C && MBEDTLS_PK_WRITE_C && MBEDTLS_FS_IO */
453