1 /*
2 * X.509 certificate writing
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 * References:
21 * - certificates: RFC 5280, updated by RFC 6818
22 * - CSRs: PKCS#10 v1.7 aka RFC 2986
23 * - attributes: PKCS#9 v2.0 aka RFC 2985
24 */
25
26 #include "common.h"
27
28 #if defined(MBEDTLS_X509_CRT_WRITE_C)
29
30 #include "mbedtls/x509_crt.h"
31 #include "mbedtls/asn1write.h"
32 #include "mbedtls/error.h"
33 #include "mbedtls/oid.h"
34 #include "mbedtls/platform_util.h"
35 #include "mbedtls/sha1.h"
36
37 #include <string.h>
38
39 #if defined(MBEDTLS_PEM_WRITE_C)
40 #include "mbedtls/pem.h"
41 #endif /* MBEDTLS_PEM_WRITE_C */
42
mbedtls_x509write_crt_init(mbedtls_x509write_cert * ctx)43 void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx )
44 {
45 memset( ctx, 0, sizeof( mbedtls_x509write_cert ) );
46
47 mbedtls_mpi_init( &ctx->serial );
48 ctx->version = MBEDTLS_X509_CRT_VERSION_3;
49 }
50
mbedtls_x509write_crt_free(mbedtls_x509write_cert * ctx)51 void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx )
52 {
53 mbedtls_mpi_free( &ctx->serial );
54
55 mbedtls_asn1_free_named_data_list( &ctx->subject );
56 mbedtls_asn1_free_named_data_list( &ctx->issuer );
57 mbedtls_asn1_free_named_data_list( &ctx->extensions );
58
59 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_x509write_cert ) );
60 }
61
mbedtls_x509write_crt_set_version(mbedtls_x509write_cert * ctx,int version)62 void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx,
63 int version )
64 {
65 ctx->version = version;
66 }
67
mbedtls_x509write_crt_set_md_alg(mbedtls_x509write_cert * ctx,mbedtls_md_type_t md_alg)68 void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx,
69 mbedtls_md_type_t md_alg )
70 {
71 ctx->md_alg = md_alg;
72 }
73
mbedtls_x509write_crt_set_subject_key(mbedtls_x509write_cert * ctx,mbedtls_pk_context * key)74 void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx,
75 mbedtls_pk_context *key )
76 {
77 ctx->subject_key = key;
78 }
79
mbedtls_x509write_crt_set_issuer_key(mbedtls_x509write_cert * ctx,mbedtls_pk_context * key)80 void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx,
81 mbedtls_pk_context *key )
82 {
83 ctx->issuer_key = key;
84 }
85
mbedtls_x509write_crt_set_subject_name(mbedtls_x509write_cert * ctx,const char * subject_name)86 int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
87 const char *subject_name )
88 {
89 return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
90 }
91
mbedtls_x509write_crt_set_issuer_name(mbedtls_x509write_cert * ctx,const char * issuer_name)92 int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
93 const char *issuer_name )
94 {
95 return mbedtls_x509_string_to_names( &ctx->issuer, issuer_name );
96 }
97
mbedtls_x509write_crt_set_serial(mbedtls_x509write_cert * ctx,const mbedtls_mpi * serial)98 int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx,
99 const mbedtls_mpi *serial )
100 {
101 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
102
103 if( ( ret = mbedtls_mpi_copy( &ctx->serial, serial ) ) != 0 )
104 return( ret );
105
106 return( 0 );
107 }
108
mbedtls_x509write_crt_set_validity(mbedtls_x509write_cert * ctx,const char * not_before,const char * not_after)109 int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx,
110 const char *not_before,
111 const char *not_after )
112 {
113 if( strlen( not_before ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ||
114 strlen( not_after ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 )
115 {
116 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
117 }
118 strncpy( ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
119 strncpy( ctx->not_after , not_after , MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
120 ctx->not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
121 ctx->not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
122
123 return( 0 );
124 }
125
mbedtls_x509write_crt_set_extension(mbedtls_x509write_cert * ctx,const char * oid,size_t oid_len,int critical,const unsigned char * val,size_t val_len)126 int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
127 const char *oid, size_t oid_len,
128 int critical,
129 const unsigned char *val, size_t val_len )
130 {
131 return( mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
132 critical, val, val_len ) );
133 }
134
mbedtls_x509write_crt_set_basic_constraints(mbedtls_x509write_cert * ctx,int is_ca,int max_pathlen)135 int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
136 int is_ca, int max_pathlen )
137 {
138 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
139 unsigned char buf[9];
140 unsigned char *c = buf + sizeof(buf);
141 size_t len = 0;
142
143 memset( buf, 0, sizeof(buf) );
144
145 if( is_ca && max_pathlen > 127 )
146 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
147
148 if( is_ca )
149 {
150 if( max_pathlen >= 0 )
151 {
152 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf,
153 max_pathlen ) );
154 }
155 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( &c, buf, 1 ) );
156 }
157
158 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
159 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf,
160 MBEDTLS_ASN1_CONSTRUCTED |
161 MBEDTLS_ASN1_SEQUENCE ) );
162
163 return(
164 mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_BASIC_CONSTRAINTS,
165 MBEDTLS_OID_SIZE( MBEDTLS_OID_BASIC_CONSTRAINTS ),
166 0, buf + sizeof(buf) - len, len ) );
167 }
168
169 #if defined(MBEDTLS_SHA1_C)
mbedtls_x509write_crt_set_subject_key_identifier(mbedtls_x509write_cert * ctx)170 int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx )
171 {
172 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
173 unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
174 unsigned char *c = buf + sizeof(buf);
175 size_t len = 0;
176
177 memset( buf, 0, sizeof(buf) );
178 MBEDTLS_ASN1_CHK_ADD( len,
179 mbedtls_pk_write_pubkey( &c, buf, ctx->subject_key ) );
180
181 ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
182 buf + sizeof( buf ) - 20 );
183 if( ret != 0 )
184 return( ret );
185 c = buf + sizeof( buf ) - 20;
186 len = 20;
187
188 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
189 MBEDTLS_ASN1_CHK_ADD( len,
190 mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OCTET_STRING ) );
191
192 return mbedtls_x509write_crt_set_extension( ctx,
193 MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
194 MBEDTLS_OID_SIZE( MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER ),
195 0, buf + sizeof(buf) - len, len );
196 }
197
mbedtls_x509write_crt_set_authority_key_identifier(mbedtls_x509write_cert * ctx)198 int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx )
199 {
200 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
201 unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
202 unsigned char *c = buf + sizeof( buf );
203 size_t len = 0;
204
205 memset( buf, 0, sizeof(buf) );
206 MBEDTLS_ASN1_CHK_ADD( len,
207 mbedtls_pk_write_pubkey( &c, buf, ctx->issuer_key ) );
208
209 ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
210 buf + sizeof( buf ) - 20 );
211 if( ret != 0 )
212 return( ret );
213 c = buf + sizeof( buf ) - 20;
214 len = 20;
215
216 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
217 MBEDTLS_ASN1_CHK_ADD( len,
218 mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC | 0 ) );
219
220 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
221 MBEDTLS_ASN1_CHK_ADD( len,
222 mbedtls_asn1_write_tag( &c, buf,
223 MBEDTLS_ASN1_CONSTRUCTED |
224 MBEDTLS_ASN1_SEQUENCE ) );
225
226 return mbedtls_x509write_crt_set_extension(
227 ctx, MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER,
228 MBEDTLS_OID_SIZE( MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER ),
229 0, buf + sizeof( buf ) - len, len );
230 }
231 #endif /* MBEDTLS_SHA1_C */
232
mbedtls_x509write_crt_set_key_usage(mbedtls_x509write_cert * ctx,unsigned int key_usage)233 int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
234 unsigned int key_usage )
235 {
236 unsigned char buf[5], ku[2];
237 unsigned char *c;
238 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
239 const unsigned int allowed_bits = MBEDTLS_X509_KU_DIGITAL_SIGNATURE |
240 MBEDTLS_X509_KU_NON_REPUDIATION |
241 MBEDTLS_X509_KU_KEY_ENCIPHERMENT |
242 MBEDTLS_X509_KU_DATA_ENCIPHERMENT |
243 MBEDTLS_X509_KU_KEY_AGREEMENT |
244 MBEDTLS_X509_KU_KEY_CERT_SIGN |
245 MBEDTLS_X509_KU_CRL_SIGN |
246 MBEDTLS_X509_KU_ENCIPHER_ONLY |
247 MBEDTLS_X509_KU_DECIPHER_ONLY;
248
249 /* Check that nothing other than the allowed flags is set */
250 if( ( key_usage & ~allowed_bits ) != 0 )
251 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
252
253 c = buf + 5;
254 ku[0] = (unsigned char)( key_usage );
255 ku[1] = (unsigned char)( key_usage >> 8 );
256 ret = mbedtls_asn1_write_named_bitstring( &c, buf, ku, 9 );
257
258 if( ret < 0 )
259 return( ret );
260 else if( ret < 3 || ret > 5 )
261 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
262
263 ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
264 MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
265 1, c, (size_t)ret );
266 if( ret != 0 )
267 return( ret );
268
269 return( 0 );
270 }
271
mbedtls_x509write_crt_set_ns_cert_type(mbedtls_x509write_cert * ctx,unsigned char ns_cert_type)272 int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
273 unsigned char ns_cert_type )
274 {
275 unsigned char buf[4];
276 unsigned char *c;
277 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
278
279 c = buf + 4;
280
281 ret = mbedtls_asn1_write_named_bitstring( &c, buf, &ns_cert_type, 8 );
282 if( ret < 3 || ret > 4 )
283 return( ret );
284
285 ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
286 MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
287 0, c, (size_t)ret );
288 if( ret != 0 )
289 return( ret );
290
291 return( 0 );
292 }
293
x509_write_time(unsigned char ** p,unsigned char * start,const char * t,size_t size)294 static int x509_write_time( unsigned char **p, unsigned char *start,
295 const char *t, size_t size )
296 {
297 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
298 size_t len = 0;
299
300 /*
301 * write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
302 */
303 if( t[0] == '2' && t[1] == '0' && t[2] < '5' )
304 {
305 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
306 (const unsigned char *) t + 2,
307 size - 2 ) );
308 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
309 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
310 MBEDTLS_ASN1_UTC_TIME ) );
311 }
312 else
313 {
314 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
315 (const unsigned char *) t,
316 size ) );
317 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
318 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
319 MBEDTLS_ASN1_GENERALIZED_TIME ) );
320 }
321
322 return( (int) len );
323 }
324
mbedtls_x509write_crt_der(mbedtls_x509write_cert * ctx,unsigned char * buf,size_t size,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)325 int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx,
326 unsigned char *buf, size_t size,
327 int (*f_rng)(void *, unsigned char *, size_t),
328 void *p_rng )
329 {
330 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
331 const char *sig_oid;
332 size_t sig_oid_len = 0;
333 unsigned char *c, *c2;
334 unsigned char hash[64];
335 unsigned char sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
336 size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
337 size_t len = 0;
338 mbedtls_pk_type_t pk_alg;
339
340 /*
341 * Prepare data to be signed at the end of the target buffer
342 */
343 c = buf + size;
344
345 /* Signature algorithm needed in TBS, and later for actual signature */
346
347 /* There's no direct way of extracting a signature algorithm
348 * (represented as an element of mbedtls_pk_type_t) from a PK instance. */
349 if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_RSA ) )
350 pk_alg = MBEDTLS_PK_RSA;
351 else if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_ECDSA ) )
352 pk_alg = MBEDTLS_PK_ECDSA;
353 else
354 return( MBEDTLS_ERR_X509_INVALID_ALG );
355
356 if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
357 &sig_oid, &sig_oid_len ) ) != 0 )
358 {
359 return( ret );
360 }
361
362 /*
363 * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
364 */
365
366 /* Only for v3 */
367 if( ctx->version == MBEDTLS_X509_CRT_VERSION_3 )
368 {
369 MBEDTLS_ASN1_CHK_ADD( len,
370 mbedtls_x509_write_extensions( &c,
371 buf, ctx->extensions ) );
372 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
373 MBEDTLS_ASN1_CHK_ADD( len,
374 mbedtls_asn1_write_tag( &c, buf,
375 MBEDTLS_ASN1_CONSTRUCTED |
376 MBEDTLS_ASN1_SEQUENCE ) );
377 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
378 MBEDTLS_ASN1_CHK_ADD( len,
379 mbedtls_asn1_write_tag( &c, buf,
380 MBEDTLS_ASN1_CONTEXT_SPECIFIC |
381 MBEDTLS_ASN1_CONSTRUCTED | 3 ) );
382 }
383
384 /*
385 * SubjectPublicKeyInfo
386 */
387 MBEDTLS_ASN1_CHK_ADD( pub_len,
388 mbedtls_pk_write_pubkey_der( ctx->subject_key,
389 buf, c - buf ) );
390 c -= pub_len;
391 len += pub_len;
392
393 /*
394 * Subject ::= Name
395 */
396 MBEDTLS_ASN1_CHK_ADD( len,
397 mbedtls_x509_write_names( &c, buf,
398 ctx->subject ) );
399
400 /*
401 * Validity ::= SEQUENCE {
402 * notBefore Time,
403 * notAfter Time }
404 */
405 sub_len = 0;
406
407 MBEDTLS_ASN1_CHK_ADD( sub_len,
408 x509_write_time( &c, buf, ctx->not_after,
409 MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
410
411 MBEDTLS_ASN1_CHK_ADD( sub_len,
412 x509_write_time( &c, buf, ctx->not_before,
413 MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
414
415 len += sub_len;
416 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, sub_len ) );
417 MBEDTLS_ASN1_CHK_ADD( len,
418 mbedtls_asn1_write_tag( &c, buf,
419 MBEDTLS_ASN1_CONSTRUCTED |
420 MBEDTLS_ASN1_SEQUENCE ) );
421
422 /*
423 * Issuer ::= Name
424 */
425 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, buf,
426 ctx->issuer ) );
427
428 /*
429 * Signature ::= AlgorithmIdentifier
430 */
431 MBEDTLS_ASN1_CHK_ADD( len,
432 mbedtls_asn1_write_algorithm_identifier( &c, buf,
433 sig_oid, strlen( sig_oid ), 0 ) );
434
435 /*
436 * Serial ::= INTEGER
437 */
438 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf,
439 &ctx->serial ) );
440
441 /*
442 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
443 */
444
445 /* Can be omitted for v1 */
446 if( ctx->version != MBEDTLS_X509_CRT_VERSION_1 )
447 {
448 sub_len = 0;
449 MBEDTLS_ASN1_CHK_ADD( sub_len,
450 mbedtls_asn1_write_int( &c, buf, ctx->version ) );
451 len += sub_len;
452 MBEDTLS_ASN1_CHK_ADD( len,
453 mbedtls_asn1_write_len( &c, buf, sub_len ) );
454 MBEDTLS_ASN1_CHK_ADD( len,
455 mbedtls_asn1_write_tag( &c, buf,
456 MBEDTLS_ASN1_CONTEXT_SPECIFIC |
457 MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
458 }
459
460 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
461 MBEDTLS_ASN1_CHK_ADD( len,
462 mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
463 MBEDTLS_ASN1_SEQUENCE ) );
464
465 /*
466 * Make signature
467 */
468
469 /* Compute hash of CRT. */
470 if( ( ret = mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c,
471 len, hash ) ) != 0 )
472 {
473 return( ret );
474 }
475
476 if( ( ret = mbedtls_pk_sign( ctx->issuer_key, ctx->md_alg,
477 hash, 0, sig, &sig_len,
478 f_rng, p_rng ) ) != 0 )
479 {
480 return( ret );
481 }
482
483 /* Move CRT to the front of the buffer to have space
484 * for the signature. */
485 memmove( buf, c, len );
486 c = buf + len;
487
488 /* Add signature at the end of the buffer,
489 * making sure that it doesn't underflow
490 * into the CRT buffer. */
491 c2 = buf + size;
492 MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, c,
493 sig_oid, sig_oid_len, sig, sig_len ) );
494
495 /*
496 * Memory layout after this step:
497 *
498 * buf c=buf+len c2 buf+size
499 * [CRT0,...,CRTn, UNUSED, ..., UNUSED, SIG0, ..., SIGm]
500 */
501
502 /* Move raw CRT to just before the signature. */
503 c = c2 - len;
504 memmove( c, buf, len );
505
506 len += sig_and_oid_len;
507 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
508 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf,
509 MBEDTLS_ASN1_CONSTRUCTED |
510 MBEDTLS_ASN1_SEQUENCE ) );
511
512 return( (int) len );
513 }
514
515 #define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n"
516 #define PEM_END_CRT "-----END CERTIFICATE-----\n"
517
518 #if defined(MBEDTLS_PEM_WRITE_C)
mbedtls_x509write_crt_pem(mbedtls_x509write_cert * crt,unsigned char * buf,size_t size,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)519 int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *crt,
520 unsigned char *buf, size_t size,
521 int (*f_rng)(void *, unsigned char *, size_t),
522 void *p_rng )
523 {
524 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
525 size_t olen;
526
527 if( ( ret = mbedtls_x509write_crt_der( crt, buf, size,
528 f_rng, p_rng ) ) < 0 )
529 {
530 return( ret );
531 }
532
533 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CRT, PEM_END_CRT,
534 buf + size - ret, ret,
535 buf, size, &olen ) ) != 0 )
536 {
537 return( ret );
538 }
539
540 return( 0 );
541 }
542 #endif /* MBEDTLS_PEM_WRITE_C */
543
544 #endif /* MBEDTLS_X509_CRT_WRITE_C */
545
