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 int own_buffer; /**< Indicates if \c raw is owned
56 * by the structure or not. */
57 mbedtls_x509_buf raw; /**< The raw certificate data (DER). */
58 mbedtls_x509_buf tbs; /**< The raw certificate body (DER). The part that is To Be Signed. */
60 int version; /**< The X.509 version. (1=v1, 2=v2, 3=v3) */
61 mbedtls_x509_buf serial; /**< Unique id for certificate issued by a specific CA. */
62 mbedtls_x509_buf sig_oid; /**< Signature algorithm, e.g. sha1RSA */
64 mbedtls_x509_buf issuer_raw; /**< The raw issuer data (DER). Used for quick comparison. */
65 mbedtls_x509_buf subject_raw; /**< The raw subject data (DER). Used for quick comparison. */
67 mbedtls_x509_name issuer; /**< The parsed issuer data (named information object). */
68 mbedtls_x509_name subject; /**< The parsed subject data (named information object). */
70 mbedtls_x509_time valid_from; /**< Start time of certificate validity. */
71 mbedtls_x509_time valid_to; /**< End time of certificate validity. */
73 mbedtls_x509_buf pk_raw;
74 mbedtls_pk_context pk; /**< Container for the public key context. */
76 mbedtls_x509_buf issuer_id; /**< Optional X.509 v2/v3 issuer unique identifier. */
77 mbedtls_x509_buf subject_id; /**< Optional X.509 v2/v3 subject unique identifier. */
78 mbedtls_x509_buf v3_ext; /**< Optional X.509 v3 extensions. */
79 mbedtls_x509_sequence subject_alt_names; /**< Optional list of raw entries of Subject Alternative Names extension (currently only dNSName and OtherName are listed). */
81 mbedtls_x509_sequence certificate_policies; /**< Optional list of certificate policies (Only anyPolicy is printed and enforced, however the rest of the policies are still listed). */
83 int ext_types; /**< Bit string containing detected and parsed extensions */
84 int ca_istrue; /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */
85 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+ */
87 unsigned int key_usage; /**< Optional key usage extension value: See the values in x509.h */
89 mbedtls_x509_sequence ext_key_usage; /**< Optional list of extended key usage OIDs. */
91 unsigned char ns_cert_type; /**< Optional Netscape certificate type extension value: See the values in x509.h */
93 mbedtls_x509_buf sig; /**< Signature: hash of the tbs part signed with the private key. */
94 mbedtls_md_type_t sig_md; /**< Internal representation of the MD algorithm of the signature algorithm, e.g. MBEDTLS_MD_SHA256 */
95 mbedtls_pk_type_t sig_pk; /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. MBEDTLS_PK_RSA */
96 void *sig_opts; /**< Signature options to be passed to mbedtls_pk_verify_ext(), e.g. for RSASSA-PSS */
98 struct mbedtls_x509_crt *next; /**< Next certificate in the CA-chain. */
103 * From RFC 5280 section 4.2.1.6:
104 * OtherName ::= SEQUENCE {
105 * type-id OBJECT IDENTIFIER,
106 * value [0] EXPLICIT ANY DEFINED BY type-id }
108 typedef struct mbedtls_x509_san_other_name
111 * The type_id is an OID as deifned in RFC 5280.
112 * To check the value of the type id, you should use
113 * \p MBEDTLS_OID_CMP with a known OID mbedtls_x509_buf.
115 mbedtls_x509_buf type_id; /**< The type id. */
119 * From RFC 4108 section 5:
120 * HardwareModuleName ::= SEQUENCE {
121 * hwType OBJECT IDENTIFIER,
122 * hwSerialNum OCTET STRING }
126 mbedtls_x509_buf oid; /**< The object identifier. */
127 mbedtls_x509_buf val; /**< The named value. */
129 hardware_module_name;
133 mbedtls_x509_san_other_name;
136 * A structure for holding the parsed Subject Alternative Name, according to type
138 typedef struct mbedtls_x509_subject_alternative_name
140 int type; /**< The SAN type, value of MBEDTLS_X509_SAN_XXX. */
142 mbedtls_x509_san_other_name other_name; /**< The otherName supported type. */
143 mbedtls_x509_buf unstructured_name; /**< The buffer for the un constructed types. Only dnsName currently supported */
145 san; /**< A union of the supported SAN types */
147 mbedtls_x509_subject_alternative_name;
150 * Build flag from an algorithm/curve identifier (pk, md, ecp)
151 * Since 0 is always XXX_NONE, ignore it.
153 #define MBEDTLS_X509_ID_FLAG( id ) ( 1 << ( (id) - 1 ) )
156 * Security profile for certificate verification.
158 * All lists are bitfields, built by ORing flags from MBEDTLS_X509_ID_FLAG().
160 typedef struct mbedtls_x509_crt_profile
162 uint32_t allowed_mds; /**< MDs for signatures */
163 uint32_t allowed_pks; /**< PK algs for signatures */
164 uint32_t allowed_curves; /**< Elliptic curves for ECDSA */
165 uint32_t rsa_min_bitlen; /**< Minimum size for RSA keys */
167 mbedtls_x509_crt_profile;
169 #define MBEDTLS_X509_CRT_VERSION_1 0
170 #define MBEDTLS_X509_CRT_VERSION_2 1
171 #define MBEDTLS_X509_CRT_VERSION_3 2
173 #define MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN 32
174 #define MBEDTLS_X509_RFC5280_UTC_TIME_LEN 15
176 #if !defined( MBEDTLS_X509_MAX_FILE_PATH_LEN )
177 #define MBEDTLS_X509_MAX_FILE_PATH_LEN 512
181 * Container for writing a certificate (CRT)
183 typedef struct mbedtls_x509write_cert
187 mbedtls_pk_context *subject_key;
188 mbedtls_pk_context *issuer_key;
189 mbedtls_asn1_named_data *subject;
190 mbedtls_asn1_named_data *issuer;
191 mbedtls_md_type_t md_alg;
192 char not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
193 char not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
194 mbedtls_asn1_named_data *extensions;
196 mbedtls_x509write_cert;
199 * Item in a verification chain: cert and flags for it
202 mbedtls_x509_crt *crt;
204 } mbedtls_x509_crt_verify_chain_item;
207 * Max size of verification chain: end-entity + intermediates + trusted root
209 #define MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 )
212 * Verification chain as built by \c mbedtls_crt_verify_chain()
216 mbedtls_x509_crt_verify_chain_item items[MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE];
219 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
220 /* This stores the list of potential trusted signers obtained from
221 * the CA callback used for the CRT verification, if configured.
222 * We must track it somewhere because the callback passes its
223 * ownership to the caller. */
224 mbedtls_x509_crt *trust_ca_cb_result;
225 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
226 } mbedtls_x509_crt_verify_chain;
228 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
231 * \brief Context for resuming X.509 verify operations
235 /* for check_signature() */
236 mbedtls_pk_restart_ctx pk;
238 /* for find_parent_in() */
239 mbedtls_x509_crt *parent; /* non-null iff parent_in in progress */
240 mbedtls_x509_crt *fallback_parent;
241 int fallback_signature_is_good;
243 /* for find_parent() */
244 int parent_is_trusted; /* -1 if find_parent is not in progress */
246 /* for verify_chain() */
249 x509_crt_rs_find_parent,
250 } in_progress; /* none if no operation is in progress */
252 mbedtls_x509_crt_verify_chain ver_chain;
254 } mbedtls_x509_crt_restart_ctx;
256 #else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
258 /* Now we can declare functions that take a pointer to that */
259 typedef void mbedtls_x509_crt_restart_ctx;
261 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
263 #if defined(MBEDTLS_X509_CRT_PARSE_C)
265 * Default security profile. Should provide a good balance between security
266 * and compatibility with current deployments.
268 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default;
271 * Expected next default profile. Recommended for new deployments.
272 * Currently targets a 128-bit security level, except for RSA-2048.
274 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next;
277 * NSA Suite B profile.
279 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb;
282 * \brief Parse a single DER formatted certificate and add it
283 * to the end of the provided chained list.
285 * \param chain The pointer to the start of the CRT chain to attach to.
286 * When parsing the first CRT in a chain, this should point
287 * to an instance of ::mbedtls_x509_crt initialized through
288 * mbedtls_x509_crt_init().
289 * \param buf The buffer holding the DER encoded certificate.
290 * \param buflen The size in Bytes of \p buf.
292 * \note This function makes an internal copy of the CRT buffer
293 * \p buf. In particular, \p buf may be destroyed or reused
294 * after this call returns. To avoid duplicating the CRT
295 * buffer (at the cost of stricter lifetime constraints),
296 * use mbedtls_x509_crt_parse_der_nocopy() instead.
298 * \return \c 0 if successful.
299 * \return A negative error code on failure.
301 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
302 const unsigned char *buf,
306 * \brief Parse a single DER formatted certificate and add it
307 * to the end of the provided chained list. This is a
308 * variant of mbedtls_x509_crt_parse_der() which takes
309 * temporary ownership of the CRT buffer until the CRT
312 * \param chain The pointer to the start of the CRT chain to attach to.
313 * When parsing the first CRT in a chain, this should point
314 * to an instance of ::mbedtls_x509_crt initialized through
315 * mbedtls_x509_crt_init().
316 * \param buf The address of the readable buffer holding the DER encoded
317 * certificate to use. On success, this buffer must be
318 * retained and not be changed for the liftetime of the
319 * CRT chain \p chain, that is, until \p chain is destroyed
320 * through a call to mbedtls_x509_crt_free().
321 * \param buflen The size in Bytes of \p buf.
323 * \note This call is functionally equivalent to
324 * mbedtls_x509_crt_parse_der(), but it avoids creating a
325 * copy of the input buffer at the cost of stronger lifetime
326 * constraints. This is useful in constrained environments
327 * where duplication of the CRT cannot be tolerated.
329 * \return \c 0 if successful.
330 * \return A negative error code on failure.
332 int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
333 const unsigned char *buf,
337 * \brief Parse one DER-encoded or one or more concatenated PEM-encoded
338 * certificates and add them to the chained list.
340 * For CRTs in PEM encoding, the function parses permissively:
341 * if at least one certificate can be parsed, the function
342 * returns the number of certificates for which parsing failed
343 * (hence \c 0 if all certificates were parsed successfully).
344 * If no certificate could be parsed, the function returns
345 * the first (negative) error encountered during parsing.
347 * PEM encoded certificates may be interleaved by other data
348 * such as human readable descriptions of their content, as
349 * long as the certificates are enclosed in the PEM specific
350 * '-----{BEGIN/END} CERTIFICATE-----' delimiters.
352 * \param chain The chain to which to add the parsed certificates.
353 * \param buf The buffer holding the certificate data in PEM or DER format.
354 * For certificates in PEM encoding, this may be a concatenation
355 * of multiple certificates; for DER encoding, the buffer must
356 * comprise exactly one certificate.
357 * \param buflen The size of \p buf, including the terminating \c NULL byte
358 * in case of PEM encoded data.
360 * \return \c 0 if all certificates were parsed successfully.
361 * \return The (positive) number of certificates that couldn't
362 * be parsed if parsing was partly successful (see above).
363 * \return A negative X509 or PEM error code otherwise.
366 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen );
368 #if defined(MBEDTLS_FS_IO)
370 * \brief Load one or more certificates and add them
371 * to the chained list. Parses permissively. If some
372 * certificates can be parsed, the result is the number
373 * of failed certificates it encountered. If none complete
374 * correctly, the first error is returned.
376 * \param chain points to the start of the chain
377 * \param path filename to read the certificates from
379 * \return 0 if all certificates parsed successfully, a positive number
380 * if partly successful or a specific X509 or PEM error code
382 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path );
385 * \brief Load one or more certificate files from a path and add them
386 * to the chained list. Parses permissively. If some
387 * certificates can be parsed, the result is the number
388 * of failed certificates it encountered. If none complete
389 * correctly, the first error is returned.
391 * \param chain points to the start of the chain
392 * \param path directory / folder to read the certificate files from
394 * \return 0 if all certificates parsed successfully, a positive number
395 * if partly successful or a specific X509 or PEM error code
397 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path );
399 #endif /* MBEDTLS_FS_IO */
401 * \brief This function parses an item in the SubjectAlternativeNames
404 * \param san_buf The buffer holding the raw data item of the subject
406 * \param san The target structure to populate with the parsed presentation
407 * of the subject alternative name encoded in \p san_raw.
409 * \note Only "dnsName" and "otherName" of type hardware_module_name
410 * as defined in RFC 4180 is supported.
412 * \note This function should be called on a single raw data of
413 * subject alternative name. For example, after successful
414 * certificate parsing, one must iterate on every item in the
415 * \p crt->subject_alt_names sequence, and pass it to
418 * \warning The target structure contains pointers to the raw data of the
419 * parsed certificate, and its lifetime is restricted by the
420 * lifetime of the certificate.
422 * \return \c 0 on success
423 * \return #MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE for an unsupported
425 * \return Another negative value for any other failure.
427 int mbedtls_x509_parse_subject_alt_name( const mbedtls_x509_buf *san_buf,
428 mbedtls_x509_subject_alternative_name *san );
430 * \brief Returns an informational string about the
433 * \param buf Buffer to write to
434 * \param size Maximum size of buffer
435 * \param prefix A line prefix
436 * \param crt The X509 certificate to represent
438 * \return The length of the string written (not including the
439 * terminated nul byte), or a negative error code.
441 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
442 const mbedtls_x509_crt *crt );
445 * \brief Returns an informational string about the
446 * verification status of a certificate.
448 * \param buf Buffer to write to
449 * \param size Maximum size of buffer
450 * \param prefix A line prefix
451 * \param flags Verification flags created by mbedtls_x509_crt_verify()
453 * \return The length of the string written (not including the
454 * terminated nul byte), or a negative error code.
456 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
460 * \brief Verify a chain of certificates.
462 * The verify callback is a user-supplied callback that
463 * can clear / modify / add flags for a certificate. If set,
464 * the verification callback is called for each
465 * certificate in the chain (from the trust-ca down to the
466 * presented crt). The parameters for the callback are:
467 * (void *parameter, mbedtls_x509_crt *crt, int certificate_depth,
468 * int *flags). With the flags representing current flags for
469 * that specific certificate and the certificate depth from
470 * the bottom (Peer cert depth = 0).
472 * All flags left after returning from the callback
473 * are also returned to the application. The function should
474 * return 0 for anything (including invalid certificates)
475 * other than fatal error, as a non-zero return code
476 * immediately aborts the verification process. For fatal
477 * errors, a specific error code should be used (different
478 * from MBEDTLS_ERR_X509_CERT_VERIFY_FAILED which should not
479 * be returned at this point), or MBEDTLS_ERR_X509_FATAL_ERROR
480 * can be used if no better code is available.
482 * \note In case verification failed, the results can be displayed
483 * using \c mbedtls_x509_crt_verify_info()
485 * \note Same as \c mbedtls_x509_crt_verify_with_profile() with the
486 * default security profile.
488 * \note It is your responsibility to provide up-to-date CRLs for
489 * all trusted CAs. If no CRL is provided for the CA that was
490 * used to sign the certificate, CRL verification is skipped
491 * silently, that is *without* setting any flag.
493 * \note The \c trust_ca list can contain two types of certificates:
494 * (1) those of trusted root CAs, so that certificates
495 * chaining up to those CAs will be trusted, and (2)
496 * self-signed end-entity certificates to be trusted (for
497 * specific peers you know) - in that case, the self-signed
498 * certificate doesn't need to have the CA bit set.
500 * \param crt The certificate chain to be verified.
501 * \param trust_ca The list of trusted CAs.
502 * \param ca_crl The list of CRLs for trusted CAs.
503 * \param cn The expected Common Name. This may be \c NULL if the
504 * CN need not be verified.
505 * \param flags The address at which to store the result of the verification.
506 * If the verification couldn't be completed, the flag value is
507 * set to (uint32_t) -1.
508 * \param f_vrfy The verification callback to use. See the documentation
509 * of mbedtls_x509_crt_verify() for more information.
510 * \param p_vrfy The context to be passed to \p f_vrfy.
512 * \return \c 0 if the chain is valid with respect to the
513 * passed CN, CAs, CRLs and security profile.
514 * \return #MBEDTLS_ERR_X509_CERT_VERIFY_FAILED in case the
515 * certificate chain verification failed. In this case,
516 * \c *flags will have one or more
517 * \c MBEDTLS_X509_BADCERT_XXX or \c MBEDTLS_X509_BADCRL_XXX
519 * \return Another negative error code in case of a fatal error
520 * encountered during the verification process.
522 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
523 mbedtls_x509_crt *trust_ca,
524 mbedtls_x509_crl *ca_crl,
525 const char *cn, uint32_t *flags,
526 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
530 * \brief Verify a chain of certificates with respect to
531 * a configurable security profile.
533 * \note Same as \c mbedtls_x509_crt_verify(), but with explicit
536 * \note The restrictions on keys (RSA minimum size, allowed curves
537 * for ECDSA) apply to all certificates: trusted root,
538 * intermediate CAs if any, and end entity certificate.
540 * \param crt The certificate chain to be verified.
541 * \param trust_ca The list of trusted CAs.
542 * \param ca_crl The list of CRLs for trusted CAs.
543 * \param profile The security profile to use for the verification.
544 * \param cn The expected Common Name. This may be \c NULL if the
545 * CN need not be verified.
546 * \param flags The address at which to store the result of the verification.
547 * If the verification couldn't be completed, the flag value is
548 * set to (uint32_t) -1.
549 * \param f_vrfy The verification callback to use. See the documentation
550 * of mbedtls_x509_crt_verify() for more information.
551 * \param p_vrfy The context to be passed to \p f_vrfy.
553 * \return \c 0 if the chain is valid with respect to the
554 * passed CN, CAs, CRLs and security profile.
555 * \return #MBEDTLS_ERR_X509_CERT_VERIFY_FAILED in case the
556 * certificate chain verification failed. In this case,
557 * \c *flags will have one or more
558 * \c MBEDTLS_X509_BADCERT_XXX or \c MBEDTLS_X509_BADCRL_XXX
560 * \return Another negative error code in case of a fatal error
561 * encountered during the verification process.
563 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
564 mbedtls_x509_crt *trust_ca,
565 mbedtls_x509_crl *ca_crl,
566 const mbedtls_x509_crt_profile *profile,
567 const char *cn, uint32_t *flags,
568 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
572 * \brief Restartable version of \c mbedtls_crt_verify_with_profile()
574 * \note Performs the same job as \c mbedtls_crt_verify_with_profile()
575 * but can return early and restart according to the limit
576 * set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
578 * \param crt The certificate chain to be verified.
579 * \param trust_ca The list of trusted CAs.
580 * \param ca_crl The list of CRLs for trusted CAs.
581 * \param profile The security profile to use for the verification.
582 * \param cn The expected Common Name. This may be \c NULL if the
583 * CN need not be verified.
584 * \param flags The address at which to store the result of the verification.
585 * If the verification couldn't be completed, the flag value is
586 * set to (uint32_t) -1.
587 * \param f_vrfy The verification callback to use. See the documentation
588 * of mbedtls_x509_crt_verify() for more information.
589 * \param p_vrfy The context to be passed to \p f_vrfy.
590 * \param rs_ctx The restart context to use. This may be set to \c NULL
591 * to disable restartable ECC.
593 * \return See \c mbedtls_crt_verify_with_profile(), or
594 * \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
595 * operations was reached: see \c mbedtls_ecp_set_max_ops().
597 int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt,
598 mbedtls_x509_crt *trust_ca,
599 mbedtls_x509_crl *ca_crl,
600 const mbedtls_x509_crt_profile *profile,
601 const char *cn, uint32_t *flags,
602 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
604 mbedtls_x509_crt_restart_ctx *rs_ctx );
607 * \brief The type of trusted certificate callbacks.
609 * Callbacks of this type are passed to and used by the CRT
610 * verification routine mbedtls_x509_crt_verify_with_ca_cb()
611 * when looking for trusted signers of a given certificate.
613 * On success, the callback returns a list of trusted
614 * certificates to be considered as potential signers
615 * for the input certificate.
617 * \param p_ctx An opaque context passed to the callback.
618 * \param child The certificate for which to search a potential signer.
619 * This will point to a readable certificate.
620 * \param candidate_cas The address at which to store the address of the first
621 * entry in the generated linked list of candidate signers.
622 * This will not be \c NULL.
624 * \note The callback must only return a non-zero value on a
625 * fatal error. If, in contrast, the search for a potential
626 * signer completes without a single candidate, the
627 * callback must return \c 0 and set \c *candidate_cas
630 * \return \c 0 on success. In this case, \c *candidate_cas points
631 * to a heap-allocated linked list of instances of
632 * ::mbedtls_x509_crt, and ownership of this list is passed
634 * \return A negative error code on failure.
636 typedef int (*mbedtls_x509_crt_ca_cb_t)( void *p_ctx,
637 mbedtls_x509_crt const *child,
638 mbedtls_x509_crt **candidate_cas );
640 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
642 * \brief Version of \c mbedtls_x509_crt_verify_with_profile() which
643 * uses a callback to acquire the list of trusted CA
646 * \param crt The certificate chain to be verified.
647 * \param f_ca_cb The callback to be used to query for potential signers
648 * of a given child certificate. See the documentation of
649 * ::mbedtls_x509_crt_ca_cb_t for more information.
650 * \param p_ca_cb The opaque context to be passed to \p f_ca_cb.
651 * \param profile The security profile for the verification.
652 * \param cn The expected Common Name. This may be \c NULL if the
653 * CN need not be verified.
654 * \param flags The address at which to store the result of the verification.
655 * If the verification couldn't be completed, the flag value is
656 * set to (uint32_t) -1.
657 * \param f_vrfy The verification callback to use. See the documentation
658 * of mbedtls_x509_crt_verify() for more information.
659 * \param p_vrfy The context to be passed to \p f_vrfy.
661 * \return See \c mbedtls_crt_verify_with_profile().
663 int mbedtls_x509_crt_verify_with_ca_cb( mbedtls_x509_crt *crt,
664 mbedtls_x509_crt_ca_cb_t f_ca_cb,
666 const mbedtls_x509_crt_profile *profile,
667 const char *cn, uint32_t *flags,
668 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
671 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
673 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
675 * \brief Check usage of certificate against keyUsage extension.
677 * \param crt Leaf certificate used.
678 * \param usage Intended usage(s) (eg MBEDTLS_X509_KU_KEY_ENCIPHERMENT
679 * before using the certificate to perform an RSA key
682 * \note Except for decipherOnly and encipherOnly, a bit set in the
683 * usage argument means this bit MUST be set in the
684 * certificate. For decipherOnly and encipherOnly, it means
685 * that bit MAY be set.
687 * \return 0 is these uses of the certificate are allowed,
688 * MBEDTLS_ERR_X509_BAD_INPUT_DATA if the keyUsage extension
689 * is present but does not match the usage argument.
691 * \note You should only call this function on leaf certificates, on
692 * (intermediate) CAs the keyUsage extension is automatically
693 * checked by \c mbedtls_x509_crt_verify().
695 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
696 unsigned int usage );
697 #endif /* MBEDTLS_X509_CHECK_KEY_USAGE) */
699 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
701 * \brief Check usage of certificate against extendedKeyUsage.
703 * \param crt Leaf certificate used.
704 * \param usage_oid Intended usage (eg MBEDTLS_OID_SERVER_AUTH or
705 * MBEDTLS_OID_CLIENT_AUTH).
706 * \param usage_len Length of usage_oid (eg given by MBEDTLS_OID_SIZE()).
708 * \return 0 if this use of the certificate is allowed,
709 * MBEDTLS_ERR_X509_BAD_INPUT_DATA if not.
711 * \note Usually only makes sense on leaf certificates.
713 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
714 const char *usage_oid,
716 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
718 #if defined(MBEDTLS_X509_CRL_PARSE_C)
720 * \brief Verify the certificate revocation status
722 * \param crt a certificate to be verified
723 * \param crl the CRL to verify against
725 * \return 1 if the certificate is revoked, 0 otherwise
728 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl );
729 #endif /* MBEDTLS_X509_CRL_PARSE_C */
732 * \brief Initialize a certificate (chain)
734 * \param crt Certificate chain to initialize
736 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt );
739 * \brief Unallocate all certificate data
741 * \param crt Certificate chain to free
743 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt );
745 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
747 * \brief Initialize a restart context
749 void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx );
752 * \brief Free the components of a restart context
754 void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx );
755 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
756 #endif /* MBEDTLS_X509_CRT_PARSE_C */
759 /* \} addtogroup x509_module */
761 #if defined(MBEDTLS_X509_CRT_WRITE_C)
763 * \brief Initialize a CRT writing context
765 * \param ctx CRT context to initialize
767 void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx );
770 * \brief Set the verion for a Certificate
771 * Default: MBEDTLS_X509_CRT_VERSION_3
773 * \param ctx CRT context to use
774 * \param version version to set (MBEDTLS_X509_CRT_VERSION_1, MBEDTLS_X509_CRT_VERSION_2 or
775 * MBEDTLS_X509_CRT_VERSION_3)
777 void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, int version );
780 * \brief Set the serial number for a Certificate.
782 * \param ctx CRT context to use
783 * \param serial serial number to set
785 * \return 0 if successful
787 int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, const mbedtls_mpi *serial );
790 * \brief Set the validity period for a Certificate
791 * Timestamps should be in string format for UTC timezone
792 * i.e. "YYYYMMDDhhmmss"
793 * e.g. "20131231235959" for December 31st 2013
796 * \param ctx CRT context to use
797 * \param not_before not_before timestamp
798 * \param not_after not_after timestamp
800 * \return 0 if timestamp was parsed successfully, or
801 * a specific error code
803 int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, const char *not_before,
804 const char *not_after );
807 * \brief Set the issuer name for a Certificate
808 * Issuer names should contain a comma-separated list
809 * of OID types and values:
810 * e.g. "C=UK,O=ARM,CN=mbed TLS CA"
812 * \param ctx CRT context to use
813 * \param issuer_name issuer name to set
815 * \return 0 if issuer name was parsed successfully, or
816 * a specific error code
818 int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
819 const char *issuer_name );
822 * \brief Set the subject name for a Certificate
823 * Subject names should contain a comma-separated list
824 * of OID types and values:
825 * e.g. "C=UK,O=ARM,CN=mbed TLS Server 1"
827 * \param ctx CRT context to use
828 * \param subject_name subject name to set
830 * \return 0 if subject name was parsed successfully, or
831 * a specific error code
833 int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
834 const char *subject_name );
837 * \brief Set the subject public key for the certificate
839 * \param ctx CRT context to use
840 * \param key public key to include
842 void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key );
845 * \brief Set the issuer key used for signing the certificate
847 * \param ctx CRT context to use
848 * \param key private key to sign with
850 void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key );
853 * \brief Set the MD algorithm to use for the signature
854 * (e.g. MBEDTLS_MD_SHA1)
856 * \param ctx CRT context to use
857 * \param md_alg MD algorithm to use
859 void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, mbedtls_md_type_t md_alg );
862 * \brief Generic function to add to or replace an extension in the
865 * \param ctx CRT context to use
866 * \param oid OID of the extension
867 * \param oid_len length of the OID
868 * \param critical if the extension is critical (per the RFC's definition)
869 * \param val value of the extension OCTET STRING
870 * \param val_len length of the value data
872 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
874 int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
875 const char *oid, size_t oid_len,
877 const unsigned char *val, size_t val_len );
880 * \brief Set the basicConstraints extension for a CRT
882 * \param ctx CRT context to use
883 * \param is_ca is this a CA certificate
884 * \param max_pathlen maximum length of certificate chains below this
885 * certificate (only for CA certificates, -1 is
888 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
890 int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
891 int is_ca, int max_pathlen );
893 #if defined(MBEDTLS_SHA1_C)
895 * \brief Set the subjectKeyIdentifier extension for a CRT
896 * Requires that mbedtls_x509write_crt_set_subject_key() has been
899 * \param ctx CRT context to use
901 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
903 int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx );
906 * \brief Set the authorityKeyIdentifier extension for a CRT
907 * Requires that mbedtls_x509write_crt_set_issuer_key() has been
910 * \param ctx CRT context to use
912 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
914 int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx );
915 #endif /* MBEDTLS_SHA1_C */
918 * \brief Set the Key Usage Extension flags
919 * (e.g. MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_KEY_CERT_SIGN)
921 * \param ctx CRT context to use
922 * \param key_usage key usage flags to set
924 * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
926 int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
927 unsigned int key_usage );
930 * \brief Set the Netscape Cert Type flags
931 * (e.g. MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT | MBEDTLS_X509_NS_CERT_TYPE_EMAIL)
933 * \param ctx CRT context to use
934 * \param ns_cert_type Netscape Cert Type flags to set
936 * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
938 int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
939 unsigned char ns_cert_type );
942 * \brief Free the contents of a CRT write context
944 * \param ctx CRT context to free
946 void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx );
949 * \brief Write a built up certificate to a X509 DER structure
950 * Note: data is written at the end of the buffer! Use the
951 * return value to determine where you should start
954 * \param ctx certificate to write away
955 * \param buf buffer to write to
956 * \param size size of the buffer
957 * \param f_rng RNG function (for signature, see note)
958 * \param p_rng RNG parameter
960 * \return length of data written if successful, or a specific
963 * \note f_rng may be NULL if RSA is used for signature and the
964 * signature is made offline (otherwise f_rng is desirable
965 * for countermeasures against timing attacks).
966 * ECDSA signatures always require a non-NULL f_rng.
968 int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
969 int (*f_rng)(void *, unsigned char *, size_t),
972 #if defined(MBEDTLS_PEM_WRITE_C)
974 * \brief Write a built up certificate to a X509 PEM string
976 * \param ctx certificate to write away
977 * \param buf buffer to write to
978 * \param size size of the buffer
979 * \param f_rng RNG function (for signature, see note)
980 * \param p_rng RNG parameter
982 * \return 0 if successful, or a specific error code
984 * \note f_rng may be NULL if RSA is used for signature and the
985 * signature is made offline (otherwise f_rng is desirable
986 * for countermeasures against timing attacks).
987 * ECDSA signatures always require a non-NULL f_rng.
989 int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
990 int (*f_rng)(void *, unsigned char *, size_t),
992 #endif /* MBEDTLS_PEM_WRITE_C */
993 #endif /* MBEDTLS_X509_CRT_WRITE_C */
999 #endif /* mbedtls_x509_crt.h */