4 * \brief X.509 certificate parsing and writing
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: Apache-2.0
10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
11 * not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
14 * http://www.apache.org/licenses/LICENSE-2.0
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
22 * This file is part of mbed TLS (https://tls.mbed.org)
24 #ifndef MBEDTLS_X509_CRT_H
25 #define MBEDTLS_X509_CRT_H
27 #if !defined(MBEDTLS_CONFIG_FILE)
30 #include MBEDTLS_CONFIG_FILE
37 * \addtogroup x509_module
46 * \name Structures and functions for parsing and writing X.509 certificates
51 * Container for an X.509 certificate. The certificate may be chained.
53 typedef struct mbedtls_x509_crt
55 mbedtls_x509_buf raw; /**< The raw certificate data (DER). */
56 mbedtls_x509_buf tbs; /**< The raw certificate body (DER). The part that is To Be Signed. */
58 int version; /**< The X.509 version. (1=v1, 2=v2, 3=v3) */
59 mbedtls_x509_buf serial; /**< Unique id for certificate issued by a specific CA. */
60 mbedtls_x509_buf sig_oid; /**< Signature algorithm, e.g. sha1RSA */
62 mbedtls_x509_buf issuer_raw; /**< The raw issuer data (DER). Used for quick comparison. */
63 mbedtls_x509_buf subject_raw; /**< The raw subject data (DER). Used for quick comparison. */
65 mbedtls_x509_name issuer; /**< The parsed issuer data (named information object). */
66 mbedtls_x509_name subject; /**< The parsed subject data (named information object). */
68 mbedtls_x509_time valid_from; /**< Start time of certificate validity. */
69 mbedtls_x509_time valid_to; /**< End time of certificate validity. */
71 mbedtls_pk_context pk; /**< Container for the public key context. */
73 mbedtls_x509_buf issuer_id; /**< Optional X.509 v2/v3 issuer unique identifier. */
74 mbedtls_x509_buf subject_id; /**< Optional X.509 v2/v3 subject unique identifier. */
75 mbedtls_x509_buf v3_ext; /**< Optional X.509 v3 extensions. */
76 mbedtls_x509_sequence subject_alt_names; /**< Optional list of Subject Alternative Names (Only dNSName supported). */
78 int ext_types; /**< Bit string containing detected and parsed extensions */
79 int ca_istrue; /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */
80 int max_pathlen; /**< Optional Basic Constraint extension value: The maximum path length to the root certificate. Path length is 1 higher than RFC 5280 'meaning', so 1+ */
82 unsigned int key_usage; /**< Optional key usage extension value: See the values in x509.h */
84 mbedtls_x509_sequence ext_key_usage; /**< Optional list of extended key usage OIDs. */
86 unsigned char ns_cert_type; /**< Optional Netscape certificate type extension value: See the values in x509.h */
88 mbedtls_x509_buf sig; /**< Signature: hash of the tbs part signed with the private key. */
89 mbedtls_md_type_t sig_md; /**< Internal representation of the MD algorithm of the signature algorithm, e.g. MBEDTLS_MD_SHA256 */
90 mbedtls_pk_type_t sig_pk; /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. MBEDTLS_PK_RSA */
91 void *sig_opts; /**< Signature options to be passed to mbedtls_pk_verify_ext(), e.g. for RSASSA-PSS */
93 struct mbedtls_x509_crt *next; /**< Next certificate in the CA-chain. */
98 * Build flag from an algorithm/curve identifier (pk, md, ecp)
99 * Since 0 is always XXX_NONE, ignore it.
101 #define MBEDTLS_X509_ID_FLAG( id ) ( 1 << ( (id) - 1 ) )
104 * Security profile for certificate verification.
106 * All lists are bitfields, built by ORing flags from MBEDTLS_X509_ID_FLAG().
108 typedef struct mbedtls_x509_crt_profile
110 uint32_t allowed_mds; /**< MDs for signatures */
111 uint32_t allowed_pks; /**< PK algs for signatures */
112 uint32_t allowed_curves; /**< Elliptic curves for ECDSA */
113 uint32_t rsa_min_bitlen; /**< Minimum size for RSA keys */
115 mbedtls_x509_crt_profile;
117 #define MBEDTLS_X509_CRT_VERSION_1 0
118 #define MBEDTLS_X509_CRT_VERSION_2 1
119 #define MBEDTLS_X509_CRT_VERSION_3 2
121 #define MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN 32
122 #define MBEDTLS_X509_RFC5280_UTC_TIME_LEN 15
124 #if !defined( MBEDTLS_X509_MAX_FILE_PATH_LEN )
125 #define MBEDTLS_X509_MAX_FILE_PATH_LEN 512
129 * Container for writing a certificate (CRT)
131 typedef struct mbedtls_x509write_cert
135 mbedtls_pk_context *subject_key;
136 mbedtls_pk_context *issuer_key;
137 mbedtls_asn1_named_data *subject;
138 mbedtls_asn1_named_data *issuer;
139 mbedtls_md_type_t md_alg;
140 char not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
141 char not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
142 mbedtls_asn1_named_data *extensions;
144 mbedtls_x509write_cert;
147 * Item in a verification chain: cert and flags for it
150 mbedtls_x509_crt *crt;
152 } mbedtls_x509_crt_verify_chain_item;
155 * Max size of verification chain: end-entity + intermediates + trusted root
157 #define MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 )
160 * Verification chain as built by \c mbedtls_crt_verify_chain()
164 mbedtls_x509_crt_verify_chain_item items[MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE];
166 } mbedtls_x509_crt_verify_chain;
168 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
171 * \brief Context for resuming X.509 verify operations
175 /* for check_signature() */
176 mbedtls_pk_restart_ctx pk;
178 /* for find_parent_in() */
179 mbedtls_x509_crt *parent; /* non-null iff parent_in in progress */
180 mbedtls_x509_crt *fallback_parent;
181 int fallback_signature_is_good;
183 /* for find_parent() */
184 int parent_is_trusted; /* -1 if find_parent is not in progress */
186 /* for verify_chain() */
189 x509_crt_rs_find_parent,
190 } in_progress; /* none if no operation is in progress */
192 mbedtls_x509_crt_verify_chain ver_chain;
194 } mbedtls_x509_crt_restart_ctx;
196 #else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
198 /* Now we can declare functions that take a pointer to that */
199 typedef void mbedtls_x509_crt_restart_ctx;
201 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
203 #if defined(MBEDTLS_X509_CRT_PARSE_C)
205 * Default security profile. Should provide a good balance between security
206 * and compatibility with current deployments.
208 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default;
211 * Expected next default profile. Recommended for new deployments.
212 * Currently targets a 128-bit security level, except for RSA-2048.
214 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next;
217 * NSA Suite B profile.
219 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb;
222 * \brief Parse a single DER formatted certificate and add it
223 * to the chained list.
225 * \param chain points to the start of the chain
226 * \param buf buffer holding the certificate DER data
227 * \param buflen size of the buffer
229 * \return 0 if successful, or a specific X509 or PEM error code
231 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf,
235 * \brief Parse one DER-encoded or one or more concatenated PEM-encoded
236 * certificates and add them to the chained list.
238 * For CRTs in PEM encoding, the function parses permissively:
239 * if at least one certificate can be parsed, the function
240 * returns the number of certificates for which parsing failed
241 * (hence \c 0 if all certificates were parsed successfully).
242 * If no certificate could be parsed, the function returns
243 * the first (negative) error encountered during parsing.
245 * PEM encoded certificates may be interleaved by other data
246 * such as human readable descriptions of their content, as
247 * long as the certificates are enclosed in the PEM specific
248 * '-----{BEGIN/END} CERTIFICATE-----' delimiters.
250 * \param chain The chain to which to add the parsed certificates.
251 * \param buf The buffer holding the certificate data in PEM or DER format.
252 * For certificates in PEM encoding, this may be a concatenation
253 * of multiple certificates; for DER encoding, the buffer must
254 * comprise exactly one certificate.
255 * \param buflen The size of \p buf, including the terminating \c NULL byte
256 * in case of PEM encoded data.
258 * \return \c 0 if all certificates were parsed successfully.
259 * \return The (positive) number of certificates that couldn't
260 * be parsed if parsing was partly successful (see above).
261 * \return A negative X509 or PEM error code otherwise.
264 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen );
266 #if defined(MBEDTLS_FS_IO)
268 * \brief Load one or more certificates and add them
269 * to the chained list. Parses permissively. If some
270 * certificates can be parsed, the result is the number
271 * of failed certificates it encountered. If none complete
272 * correctly, the first error is returned.
274 * \param chain points to the start of the chain
275 * \param path filename to read the certificates from
277 * \return 0 if all certificates parsed successfully, a positive number
278 * if partly successful or a specific X509 or PEM error code
280 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path );
283 * \brief Load one or more certificate files from a path and add them
284 * to the chained list. Parses permissively. If some
285 * certificates can be parsed, the result is the number
286 * of failed certificates it encountered. If none complete
287 * correctly, the first error is returned.
289 * \param chain points to the start of the chain
290 * \param path directory / folder to read the certificate files from
292 * \return 0 if all certificates parsed successfully, a positive number
293 * if partly successful or a specific X509 or PEM error code
295 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path );
296 #endif /* MBEDTLS_FS_IO */
299 * \brief Returns an informational string about the
302 * \param buf Buffer to write to
303 * \param size Maximum size of buffer
304 * \param prefix A line prefix
305 * \param crt The X509 certificate to represent
307 * \return The length of the string written (not including the
308 * terminated nul byte), or a negative error code.
310 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
311 const mbedtls_x509_crt *crt );
314 * \brief Returns an informational string about the
315 * verification status of a certificate.
317 * \param buf Buffer to write to
318 * \param size Maximum size of buffer
319 * \param prefix A line prefix
320 * \param flags Verification flags created by mbedtls_x509_crt_verify()
322 * \return The length of the string written (not including the
323 * terminated nul byte), or a negative error code.
325 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
329 * \brief Verify the certificate signature
331 * The verify callback is a user-supplied callback that
332 * can clear / modify / add flags for a certificate. If set,
333 * the verification callback is called for each
334 * certificate in the chain (from the trust-ca down to the
335 * presented crt). The parameters for the callback are:
336 * (void *parameter, mbedtls_x509_crt *crt, int certificate_depth,
337 * int *flags). With the flags representing current flags for
338 * that specific certificate and the certificate depth from
339 * the bottom (Peer cert depth = 0).
341 * All flags left after returning from the callback
342 * are also returned to the application. The function should
343 * return 0 for anything (including invalid certificates)
344 * other than fatal error, as a non-zero return code
345 * immediately aborts the verification process. For fatal
346 * errors, a specific error code should be used (different
347 * from MBEDTLS_ERR_X509_CERT_VERIFY_FAILED which should not
348 * be returned at this point), or MBEDTLS_ERR_X509_FATAL_ERROR
349 * can be used if no better code is available.
351 * \note In case verification failed, the results can be displayed
352 * using \c mbedtls_x509_crt_verify_info()
354 * \note Same as \c mbedtls_x509_crt_verify_with_profile() with the
355 * default security profile.
357 * \note It is your responsibility to provide up-to-date CRLs for
358 * all trusted CAs. If no CRL is provided for the CA that was
359 * used to sign the certificate, CRL verification is skipped
360 * silently, that is *without* setting any flag.
362 * \note The \c trust_ca list can contain two types of certificates:
363 * (1) those of trusted root CAs, so that certificates
364 * chaining up to those CAs will be trusted, and (2)
365 * self-signed end-entity certificates to be trusted (for
366 * specific peers you know) - in that case, the self-signed
367 * certificate doesn't need to have the CA bit set.
369 * \param crt a certificate (chain) to be verified
370 * \param trust_ca the list of trusted CAs (see note above)
371 * \param ca_crl the list of CRLs for trusted CAs (see note above)
372 * \param cn expected Common Name (can be set to
373 * NULL if the CN must not be verified)
374 * \param flags result of the verification
375 * \param f_vrfy verification function
376 * \param p_vrfy verification parameter
378 * \return 0 (and flags set to 0) if the chain was verified and valid,
379 * MBEDTLS_ERR_X509_CERT_VERIFY_FAILED if the chain was verified
380 * but found to be invalid, in which case *flags will have one
381 * or more MBEDTLS_X509_BADCERT_XXX or MBEDTLS_X509_BADCRL_XXX
382 * flags set, or another error (and flags set to 0xffffffff)
383 * in case of a fatal error encountered during the
384 * verification process.
386 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
387 mbedtls_x509_crt *trust_ca,
388 mbedtls_x509_crl *ca_crl,
389 const char *cn, uint32_t *flags,
390 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
394 * \brief Verify the certificate signature according to profile
396 * \note Same as \c mbedtls_x509_crt_verify(), but with explicit
399 * \note The restrictions on keys (RSA minimum size, allowed curves
400 * for ECDSA) apply to all certificates: trusted root,
401 * intermediate CAs if any, and end entity certificate.
403 * \param crt a certificate (chain) to be verified
404 * \param trust_ca the list of trusted CAs
405 * \param ca_crl the list of CRLs for trusted CAs
406 * \param profile security profile for verification
407 * \param cn expected Common Name (can be set to
408 * NULL if the CN must not be verified)
409 * \param flags result of the verification
410 * \param f_vrfy verification function
411 * \param p_vrfy verification parameter
413 * \return 0 if successful or MBEDTLS_ERR_X509_CERT_VERIFY_FAILED
414 * in which case *flags will have one or more
415 * MBEDTLS_X509_BADCERT_XXX or MBEDTLS_X509_BADCRL_XXX flags
417 * or another error in case of a fatal error encountered
418 * during the verification process.
420 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
421 mbedtls_x509_crt *trust_ca,
422 mbedtls_x509_crl *ca_crl,
423 const mbedtls_x509_crt_profile *profile,
424 const char *cn, uint32_t *flags,
425 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
429 * \brief Restartable version of \c mbedtls_crt_verify_with_profile()
431 * \note Performs the same job as \c mbedtls_crt_verify_with_profile()
432 * but can return early and restart according to the limit
433 * set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
435 * \param crt a certificate (chain) to be verified
436 * \param trust_ca the list of trusted CAs
437 * \param ca_crl the list of CRLs for trusted CAs
438 * \param profile security profile for verification
439 * \param cn expected Common Name (can be set to
440 * NULL if the CN must not be verified)
441 * \param flags result of the verification
442 * \param f_vrfy verification function
443 * \param p_vrfy verification parameter
444 * \param rs_ctx restart context (NULL to disable restart)
446 * \return See \c mbedtls_crt_verify_with_profile(), or
447 * \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
448 * operations was reached: see \c mbedtls_ecp_set_max_ops().
450 int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt,
451 mbedtls_x509_crt *trust_ca,
452 mbedtls_x509_crl *ca_crl,
453 const mbedtls_x509_crt_profile *profile,
454 const char *cn, uint32_t *flags,
455 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
457 mbedtls_x509_crt_restart_ctx *rs_ctx );
459 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
461 * \brief Check usage of certificate against keyUsage extension.
463 * \param crt Leaf certificate used.
464 * \param usage Intended usage(s) (eg MBEDTLS_X509_KU_KEY_ENCIPHERMENT
465 * before using the certificate to perform an RSA key
468 * \note Except for decipherOnly and encipherOnly, a bit set in the
469 * usage argument means this bit MUST be set in the
470 * certificate. For decipherOnly and encipherOnly, it means
471 * that bit MAY be set.
473 * \return 0 is these uses of the certificate are allowed,
474 * MBEDTLS_ERR_X509_BAD_INPUT_DATA if the keyUsage extension
475 * is present but does not match the usage argument.
477 * \note You should only call this function on leaf certificates, on
478 * (intermediate) CAs the keyUsage extension is automatically
479 * checked by \c mbedtls_x509_crt_verify().
481 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
482 unsigned int usage );
483 #endif /* MBEDTLS_X509_CHECK_KEY_USAGE) */
485 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
487 * \brief Check usage of certificate against extendedKeyUsage.
489 * \param crt Leaf certificate used.
490 * \param usage_oid Intended usage (eg MBEDTLS_OID_SERVER_AUTH or
491 * MBEDTLS_OID_CLIENT_AUTH).
492 * \param usage_len Length of usage_oid (eg given by MBEDTLS_OID_SIZE()).
494 * \return 0 if this use of the certificate is allowed,
495 * MBEDTLS_ERR_X509_BAD_INPUT_DATA if not.
497 * \note Usually only makes sense on leaf certificates.
499 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
500 const char *usage_oid,
502 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
504 #if defined(MBEDTLS_X509_CRL_PARSE_C)
506 * \brief Verify the certificate revocation status
508 * \param crt a certificate to be verified
509 * \param crl the CRL to verify against
511 * \return 1 if the certificate is revoked, 0 otherwise
514 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl );
515 #endif /* MBEDTLS_X509_CRL_PARSE_C */
518 * \brief Initialize a certificate (chain)
520 * \param crt Certificate chain to initialize
522 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt );
525 * \brief Unallocate all certificate data
527 * \param crt Certificate chain to free
529 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt );
531 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
533 * \brief Initialize a restart context
535 void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx );
538 * \brief Free the components of a restart context
540 void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx );
541 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
542 #endif /* MBEDTLS_X509_CRT_PARSE_C */
545 /* \} addtogroup x509_module */
547 #if defined(MBEDTLS_X509_CRT_WRITE_C)
549 * \brief Initialize a CRT writing context
551 * \param ctx CRT context to initialize
553 void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx );
556 * \brief Set the verion for a Certificate
557 * Default: MBEDTLS_X509_CRT_VERSION_3
559 * \param ctx CRT context to use
560 * \param version version to set (MBEDTLS_X509_CRT_VERSION_1, MBEDTLS_X509_CRT_VERSION_2 or
561 * MBEDTLS_X509_CRT_VERSION_3)
563 void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, int version );
566 * \brief Set the serial number for a Certificate.
568 * \param ctx CRT context to use
569 * \param serial serial number to set
571 * \return 0 if successful
573 int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, const mbedtls_mpi *serial );
576 * \brief Set the validity period for a Certificate
577 * Timestamps should be in string format for UTC timezone
578 * i.e. "YYYYMMDDhhmmss"
579 * e.g. "20131231235959" for December 31st 2013
582 * \param ctx CRT context to use
583 * \param not_before not_before timestamp
584 * \param not_after not_after timestamp
586 * \return 0 if timestamp was parsed successfully, or
587 * a specific error code
589 int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, const char *not_before,
590 const char *not_after );
593 * \brief Set the issuer name for a Certificate
594 * Issuer names should contain a comma-separated list
595 * of OID types and values:
596 * e.g. "C=UK,O=ARM,CN=mbed TLS CA"
598 * \param ctx CRT context to use
599 * \param issuer_name issuer name to set
601 * \return 0 if issuer name was parsed successfully, or
602 * a specific error code
604 int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
605 const char *issuer_name );
608 * \brief Set the subject name for a Certificate
609 * Subject names should contain a comma-separated list
610 * of OID types and values:
611 * e.g. "C=UK,O=ARM,CN=mbed TLS Server 1"
613 * \param ctx CRT context to use
614 * \param subject_name subject name to set
616 * \return 0 if subject name was parsed successfully, or
617 * a specific error code
619 int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
620 const char *subject_name );
623 * \brief Set the subject public key for the certificate
625 * \param ctx CRT context to use
626 * \param key public key to include
628 void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key );
631 * \brief Set the issuer key used for signing the certificate
633 * \param ctx CRT context to use
634 * \param key private key to sign with
636 void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key );
639 * \brief Set the MD algorithm to use for the signature
640 * (e.g. MBEDTLS_MD_SHA1)
642 * \param ctx CRT context to use
643 * \param md_alg MD algorithm to use
645 void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, mbedtls_md_type_t md_alg );
648 * \brief Generic function to add to or replace an extension in the
651 * \param ctx CRT context to use
652 * \param oid OID of the extension
653 * \param oid_len length of the OID
654 * \param critical if the extension is critical (per the RFC's definition)
655 * \param val value of the extension OCTET STRING
656 * \param val_len length of the value data
658 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
660 int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
661 const char *oid, size_t oid_len,
663 const unsigned char *val, size_t val_len );
666 * \brief Set the basicConstraints extension for a CRT
668 * \param ctx CRT context to use
669 * \param is_ca is this a CA certificate
670 * \param max_pathlen maximum length of certificate chains below this
671 * certificate (only for CA certificates, -1 is
674 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
676 int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
677 int is_ca, int max_pathlen );
679 #if defined(MBEDTLS_SHA1_C)
681 * \brief Set the subjectKeyIdentifier extension for a CRT
682 * Requires that mbedtls_x509write_crt_set_subject_key() has been
685 * \param ctx CRT context to use
687 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
689 int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx );
692 * \brief Set the authorityKeyIdentifier extension for a CRT
693 * Requires that mbedtls_x509write_crt_set_issuer_key() has been
696 * \param ctx CRT context to use
698 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
700 int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx );
701 #endif /* MBEDTLS_SHA1_C */
704 * \brief Set the Key Usage Extension flags
705 * (e.g. MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_KEY_CERT_SIGN)
707 * \param ctx CRT context to use
708 * \param key_usage key usage flags to set
710 * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
712 int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
713 unsigned int key_usage );
716 * \brief Set the Netscape Cert Type flags
717 * (e.g. MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT | MBEDTLS_X509_NS_CERT_TYPE_EMAIL)
719 * \param ctx CRT context to use
720 * \param ns_cert_type Netscape Cert Type flags to set
722 * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
724 int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
725 unsigned char ns_cert_type );
728 * \brief Free the contents of a CRT write context
730 * \param ctx CRT context to free
732 void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx );
735 * \brief Write a built up certificate to a X509 DER structure
736 * Note: data is written at the end of the buffer! Use the
737 * return value to determine where you should start
740 * \param ctx certificate to write away
741 * \param buf buffer to write to
742 * \param size size of the buffer
743 * \param f_rng RNG function (for signature, see note)
744 * \param p_rng RNG parameter
746 * \return length of data written if successful, or a specific
749 * \note f_rng may be NULL if RSA is used for signature and the
750 * signature is made offline (otherwise f_rng is desirable
751 * for countermeasures against timing attacks).
752 * ECDSA signatures always require a non-NULL f_rng.
754 int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
755 int (*f_rng)(void *, unsigned char *, size_t),
758 #if defined(MBEDTLS_PEM_WRITE_C)
760 * \brief Write a built up certificate to a X509 PEM string
762 * \param ctx certificate to write away
763 * \param buf buffer to write to
764 * \param size size of the buffer
765 * \param f_rng RNG function (for signature, see note)
766 * \param p_rng RNG parameter
768 * \return 0 if successful, or a specific error code
770 * \note f_rng may be NULL if RSA is used for signature and the
771 * signature is made offline (otherwise f_rng is desirable
772 * for countermeasures against timing attacks).
773 * ECDSA signatures always require a non-NULL f_rng.
775 int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
776 int (*f_rng)(void *, unsigned char *, size_t),
778 #endif /* MBEDTLS_PEM_WRITE_C */
779 #endif /* MBEDTLS_X509_CRT_WRITE_C */
785 #endif /* mbedtls_x509_crt.h */