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Diffstat (limited to 'include/mbedtls/x509_crt.h')
| -rw-r--r-- | include/mbedtls/x509_crt.h | 1227 |
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diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h new file mode 100644 index 000000000..d2b7648c4 --- /dev/null +++ b/include/mbedtls/x509_crt.h @@ -0,0 +1,1227 @@ +/** + * \file x509_crt.h + * + * \brief X.509 certificate parsing and writing + */ +/* + * Copyright The Mbed TLS Contributors + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef MBEDTLS_X509_CRT_H +#define MBEDTLS_X509_CRT_H +#include "mbedtls/private_access.h" + +#include "mbedtls/build_info.h" +#include "mbedtls/legacy_or_psa.h" + +#include "mbedtls/x509.h" +#include "mbedtls/x509_crl.h" +#include "mbedtls/bignum.h" + +/** + * \addtogroup x509_module + * \{ + */ + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \name Structures and functions for parsing and writing X.509 certificates + * \{ + */ + +/** + * Container for an X.509 certificate. The certificate may be chained. + * + * Some fields of this structure are publicly readable. Do not modify + * them except via Mbed TLS library functions: the effect of modifying + * those fields or the data that those fields points to is unspecified. + */ +typedef struct mbedtls_x509_crt +{ + int MBEDTLS_PRIVATE(own_buffer); /**< Indicates if \c raw is owned + * by the structure or not. */ + mbedtls_x509_buf raw; /**< The raw certificate data (DER). */ + mbedtls_x509_buf tbs; /**< The raw certificate body (DER). The part that is To Be Signed. */ + + int version; /**< The X.509 version. (1=v1, 2=v2, 3=v3) */ + mbedtls_x509_buf serial; /**< Unique id for certificate issued by a specific CA. */ + mbedtls_x509_buf sig_oid; /**< Signature algorithm, e.g. sha1RSA */ + + mbedtls_x509_buf issuer_raw; /**< The raw issuer data (DER). Used for quick comparison. */ + mbedtls_x509_buf subject_raw; /**< The raw subject data (DER). Used for quick comparison. */ + + mbedtls_x509_name issuer; /**< The parsed issuer data (named information object). */ + mbedtls_x509_name subject; /**< The parsed subject data (named information object). */ + + mbedtls_x509_time valid_from; /**< Start time of certificate validity. */ + mbedtls_x509_time valid_to; /**< End time of certificate validity. */ + + mbedtls_x509_buf pk_raw; + mbedtls_pk_context pk; /**< Container for the public key context. */ + + mbedtls_x509_buf issuer_id; /**< Optional X.509 v2/v3 issuer unique identifier. */ + mbedtls_x509_buf subject_id; /**< Optional X.509 v2/v3 subject unique identifier. */ + mbedtls_x509_buf v3_ext; /**< Optional X.509 v3 extensions. */ + mbedtls_x509_sequence subject_alt_names; /**< Optional list of raw entries of Subject Alternative Names extension (currently only dNSName and OtherName are listed). */ + + 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). */ + + int MBEDTLS_PRIVATE(ext_types); /**< Bit string containing detected and parsed extensions */ + int MBEDTLS_PRIVATE(ca_istrue); /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */ + int MBEDTLS_PRIVATE(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+ */ + + unsigned int MBEDTLS_PRIVATE(key_usage); /**< Optional key usage extension value: See the values in x509.h */ + + mbedtls_x509_sequence ext_key_usage; /**< Optional list of extended key usage OIDs. */ + + unsigned char MBEDTLS_PRIVATE(ns_cert_type); /**< Optional Netscape certificate type extension value: See the values in x509.h */ + + mbedtls_x509_buf MBEDTLS_PRIVATE(sig); /**< Signature: hash of the tbs part signed with the private key. */ + mbedtls_md_type_t MBEDTLS_PRIVATE(sig_md); /**< Internal representation of the MD algorithm of the signature algorithm, e.g. MBEDTLS_MD_SHA256 */ + mbedtls_pk_type_t MBEDTLS_PRIVATE(sig_pk); /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. MBEDTLS_PK_RSA */ + void *MBEDTLS_PRIVATE(sig_opts); /**< Signature options to be passed to mbedtls_pk_verify_ext(), e.g. for RSASSA-PSS */ + + /** Next certificate in the linked list that constitutes the CA chain. + * \p NULL indicates the end of the list. + * Do not modify this field directly. */ + struct mbedtls_x509_crt *next; +} +mbedtls_x509_crt; + +/** + * From RFC 5280 section 4.2.1.6: + * OtherName ::= SEQUENCE { + * type-id OBJECT IDENTIFIER, + * value [0] EXPLICIT ANY DEFINED BY type-id } + * + * Future versions of the library may add new fields to this structure or + * to its embedded union and structure. + */ +typedef struct mbedtls_x509_san_other_name +{ + /** + * The type_id is an OID as defined in RFC 5280. + * To check the value of the type id, you should use + * \p MBEDTLS_OID_CMP with a known OID mbedtls_x509_buf. + */ + mbedtls_x509_buf type_id; /**< The type id. */ + union + { + /** + * From RFC 4108 section 5: + * HardwareModuleName ::= SEQUENCE { + * hwType OBJECT IDENTIFIER, + * hwSerialNum OCTET STRING } + */ + struct + { + mbedtls_x509_buf oid; /**< The object identifier. */ + mbedtls_x509_buf val; /**< The named value. */ + } + hardware_module_name; + } + value; +} +mbedtls_x509_san_other_name; + +/** + * A structure for holding the parsed Subject Alternative Name, + * according to type. + * + * Future versions of the library may add new fields to this structure or + * to its embedded union and structure. + */ +typedef struct mbedtls_x509_subject_alternative_name +{ + int type; /**< The SAN type, value of MBEDTLS_X509_SAN_XXX. */ + union { + mbedtls_x509_san_other_name other_name; /**< The otherName supported type. */ + mbedtls_x509_buf unstructured_name; /**< The buffer for the un constructed types. Only dnsName currently supported */ + } + san; /**< A union of the supported SAN types */ +} +mbedtls_x509_subject_alternative_name; + +/** + * Build flag from an algorithm/curve identifier (pk, md, ecp) + * Since 0 is always XXX_NONE, ignore it. + */ +#define MBEDTLS_X509_ID_FLAG( id ) ( 1 << ( (id) - 1 ) ) + +/** + * Security profile for certificate verification. + * + * All lists are bitfields, built by ORing flags from MBEDTLS_X509_ID_FLAG(). + * + * The fields of this structure are part of the public API and can be + * manipulated directly by applications. Future versions of the library may + * add extra fields or reorder existing fields. + * + * You can create custom profiles by starting from a copy of + * an existing profile, such as mbedtls_x509_crt_profile_default or + * mbedtls_x509_ctr_profile_none and then tune it to your needs. + * + * For example to allow SHA-224 in addition to the default: + * + * mbedtls_x509_crt_profile my_profile = mbedtls_x509_crt_profile_default; + * my_profile.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ); + * + * Or to allow only RSA-3072+ with SHA-256: + * + * mbedtls_x509_crt_profile my_profile = mbedtls_x509_crt_profile_none; + * my_profile.allowed_mds = MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ); + * my_profile.allowed_pks = MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_RSA ); + * my_profile.rsa_min_bitlen = 3072; + */ +typedef struct mbedtls_x509_crt_profile +{ + uint32_t allowed_mds; /**< MDs for signatures */ + uint32_t allowed_pks; /**< PK algs for public keys; + * this applies to all certificates + * in the provided chain. */ + uint32_t allowed_curves; /**< Elliptic curves for ECDSA */ + uint32_t rsa_min_bitlen; /**< Minimum size for RSA keys */ +} +mbedtls_x509_crt_profile; + +#define MBEDTLS_X509_CRT_VERSION_1 0 +#define MBEDTLS_X509_CRT_VERSION_2 1 +#define MBEDTLS_X509_CRT_VERSION_3 2 + +#define MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN 32 +#define MBEDTLS_X509_RFC5280_UTC_TIME_LEN 15 + +#if !defined( MBEDTLS_X509_MAX_FILE_PATH_LEN ) +#define MBEDTLS_X509_MAX_FILE_PATH_LEN 512 +#endif + +/* This macro unfolds to the concatenation of macro invocations + * X509_CRT_ERROR_INFO( error code, + * error code as string, + * human readable description ) + * where X509_CRT_ERROR_INFO is defined by the user. + * See x509_crt.c for an example of how to use this. */ +#define MBEDTLS_X509_CRT_ERROR_INFO_LIST \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_EXPIRED, \ + "MBEDTLS_X509_BADCERT_EXPIRED", \ + "The certificate validity has expired" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_REVOKED, \ + "MBEDTLS_X509_BADCERT_REVOKED", \ + "The certificate has been revoked (is on a CRL)" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_CN_MISMATCH, \ + "MBEDTLS_X509_BADCERT_CN_MISMATCH", \ + "The certificate Common Name (CN) does not match with the expected CN" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_NOT_TRUSTED, \ + "MBEDTLS_X509_BADCERT_NOT_TRUSTED", \ + "The certificate is not correctly signed by the trusted CA" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCRL_NOT_TRUSTED, \ + "MBEDTLS_X509_BADCRL_NOT_TRUSTED", \ + "The CRL is not correctly signed by the trusted CA" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCRL_EXPIRED, \ + "MBEDTLS_X509_BADCRL_EXPIRED", \ + "The CRL is expired" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_MISSING, \ + "MBEDTLS_X509_BADCERT_MISSING", \ + "Certificate was missing" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_SKIP_VERIFY, \ + "MBEDTLS_X509_BADCERT_SKIP_VERIFY", \ + "Certificate verification was skipped" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_OTHER, \ + "MBEDTLS_X509_BADCERT_OTHER", \ + "Other reason (can be used by verify callback)" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_FUTURE, \ + "MBEDTLS_X509_BADCERT_FUTURE", \ + "The certificate validity starts in the future" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCRL_FUTURE, \ + "MBEDTLS_X509_BADCRL_FUTURE", \ + "The CRL is from the future" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_KEY_USAGE, \ + "MBEDTLS_X509_BADCERT_KEY_USAGE", \ + "Usage does not match the keyUsage extension" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, \ + "MBEDTLS_X509_BADCERT_EXT_KEY_USAGE", \ + "Usage does not match the extendedKeyUsage extension" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_NS_CERT_TYPE, \ + "MBEDTLS_X509_BADCERT_NS_CERT_TYPE", \ + "Usage does not match the nsCertType extension" ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_BAD_MD, \ + "MBEDTLS_X509_BADCERT_BAD_MD", \ + "The certificate is signed with an unacceptable hash." ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_BAD_PK, \ + "MBEDTLS_X509_BADCERT_BAD_PK", \ + "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCERT_BAD_KEY, \ + "MBEDTLS_X509_BADCERT_BAD_KEY", \ + "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCRL_BAD_MD, \ + "MBEDTLS_X509_BADCRL_BAD_MD", \ + "The CRL is signed with an unacceptable hash." ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCRL_BAD_PK, \ + "MBEDTLS_X509_BADCRL_BAD_PK", \ + "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." ) \ + X509_CRT_ERROR_INFO( MBEDTLS_X509_BADCRL_BAD_KEY, \ + "MBEDTLS_X509_BADCRL_BAD_KEY", \ + "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." ) + +/** + * Container for writing a certificate (CRT) + */ +typedef struct mbedtls_x509write_cert +{ + int MBEDTLS_PRIVATE(version); + mbedtls_mpi MBEDTLS_PRIVATE(serial); + mbedtls_pk_context *MBEDTLS_PRIVATE(subject_key); + mbedtls_pk_context *MBEDTLS_PRIVATE(issuer_key); + mbedtls_asn1_named_data *MBEDTLS_PRIVATE(subject); + mbedtls_asn1_named_data *MBEDTLS_PRIVATE(issuer); + mbedtls_md_type_t MBEDTLS_PRIVATE(md_alg); + char MBEDTLS_PRIVATE(not_before)[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1]; + char MBEDTLS_PRIVATE(not_after)[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1]; + mbedtls_asn1_named_data *MBEDTLS_PRIVATE(extensions); +} +mbedtls_x509write_cert; + +/** + * Item in a verification chain: cert and flags for it + */ +typedef struct { + mbedtls_x509_crt *MBEDTLS_PRIVATE(crt); + uint32_t MBEDTLS_PRIVATE(flags); +} mbedtls_x509_crt_verify_chain_item; + +/** + * Max size of verification chain: end-entity + intermediates + trusted root + */ +#define MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 ) + +/** + * Verification chain as built by \c mbedtls_crt_verify_chain() + */ +typedef struct +{ + mbedtls_x509_crt_verify_chain_item MBEDTLS_PRIVATE(items)[MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE]; + unsigned MBEDTLS_PRIVATE(len); + +#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) + /* This stores the list of potential trusted signers obtained from + * the CA callback used for the CRT verification, if configured. + * We must track it somewhere because the callback passes its + * ownership to the caller. */ + mbedtls_x509_crt *MBEDTLS_PRIVATE(trust_ca_cb_result); +#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ +} mbedtls_x509_crt_verify_chain; + +#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) + +/** + * \brief Context for resuming X.509 verify operations + */ +typedef struct +{ + /* for check_signature() */ + mbedtls_pk_restart_ctx MBEDTLS_PRIVATE(pk); + + /* for find_parent_in() */ + mbedtls_x509_crt *MBEDTLS_PRIVATE(parent); /* non-null iff parent_in in progress */ + mbedtls_x509_crt *MBEDTLS_PRIVATE(fallback_parent); + int MBEDTLS_PRIVATE(fallback_signature_is_good); + + /* for find_parent() */ + int MBEDTLS_PRIVATE(parent_is_trusted); /* -1 if find_parent is not in progress */ + + /* for verify_chain() */ + enum { + x509_crt_rs_none, + x509_crt_rs_find_parent, + } MBEDTLS_PRIVATE(in_progress); /* none if no operation is in progress */ + int MBEDTLS_PRIVATE(self_cnt); + mbedtls_x509_crt_verify_chain MBEDTLS_PRIVATE(ver_chain); + +} mbedtls_x509_crt_restart_ctx; + +#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ + +/* Now we can declare functions that take a pointer to that */ +typedef void mbedtls_x509_crt_restart_ctx; + +#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +/** + * Default security profile. Should provide a good balance between security + * and compatibility with current deployments. + * + * This profile permits: + * - SHA2 hashes with at least 256 bits: SHA-256, SHA-384, SHA-512. + * - Elliptic curves with 255 bits and above except secp256k1. + * - RSA with 2048 bits and above. + * + * New minor versions of Mbed TLS may extend this profile, for example if + * new algorithms are added to the library. New minor versions of Mbed TLS will + * not reduce this profile unless serious security concerns require it. + */ +extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default; + +/** + * Expected next default profile. Recommended for new deployments. + * Currently targets a 128-bit security level, except for allowing RSA-2048. + * This profile may change at any time. + */ +extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next; + +/** + * NSA Suite B profile. + */ +extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb; + +/** + * Empty profile that allows nothing. Useful as a basis for constructing + * custom profiles. + */ +extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_none; + +/** + * \brief Parse a single DER formatted certificate and add it + * to the end of the provided chained list. + * + * \param chain The pointer to the start of the CRT chain to attach to. + * When parsing the first CRT in a chain, this should point + * to an instance of ::mbedtls_x509_crt initialized through + * mbedtls_x509_crt_init(). + * \param buf The buffer holding the DER encoded certificate. + * \param buflen The size in Bytes of \p buf. + * + * \note This function makes an internal copy of the CRT buffer + * \p buf. In particular, \p buf may be destroyed or reused + * after this call returns. To avoid duplicating the CRT + * buffer (at the cost of stricter lifetime constraints), + * use mbedtls_x509_crt_parse_der_nocopy() instead. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, + const unsigned char *buf, + size_t buflen ); + +/** + * \brief The type of certificate extension callbacks. + * + * Callbacks of this type are passed to and used by the + * mbedtls_x509_crt_parse_der_with_ext_cb() routine when + * it encounters either an unsupported extension or a + * "certificate policies" extension containing any + * unsupported certificate policies. + * Future versions of the library may invoke the callback + * in other cases, if and when the need arises. + * + * \param p_ctx An opaque context passed to the callback. + * \param crt The certificate being parsed. + * \param oid The OID of the extension. + * \param critical Whether the extension is critical. + * \param p Pointer to the start of the extension value + * (the content of the OCTET STRING). + * \param end End of extension value. + * + * \note The callback must fail and return a negative error code + * if it can not parse or does not support the extension. + * When the callback fails to parse a critical extension + * mbedtls_x509_crt_parse_der_with_ext_cb() also fails. + * When the callback fails to parse a non critical extension + * mbedtls_x509_crt_parse_der_with_ext_cb() simply skips + * the extension and continues parsing. + * + * \return \c 0 on success. + * \return A negative error code on failure. + */ +typedef int (*mbedtls_x509_crt_ext_cb_t)( void *p_ctx, + mbedtls_x509_crt const *crt, + mbedtls_x509_buf const *oid, + int critical, + const unsigned char *p, + const unsigned char *end ); + +/** + * \brief Parse a single DER formatted certificate and add it + * to the end of the provided chained list. + * + * \param chain The pointer to the start of the CRT chain to attach to. + * When parsing the first CRT in a chain, this should point + * to an instance of ::mbedtls_x509_crt initialized through + * mbedtls_x509_crt_init(). + * \param buf The buffer holding the DER encoded certificate. + * \param buflen The size in Bytes of \p buf. + * \param make_copy When not zero this function makes an internal copy of the + * CRT buffer \p buf. In particular, \p buf may be destroyed + * or reused after this call returns. + * When zero this function avoids duplicating the CRT buffer + * by taking temporary ownership thereof until the CRT + * is destroyed (like mbedtls_x509_crt_parse_der_nocopy()) + * \param cb A callback invoked for every unsupported certificate + * extension. + * \param p_ctx An opaque context passed to the callback. + * + * \note This call is functionally equivalent to + * mbedtls_x509_crt_parse_der(), and/or + * mbedtls_x509_crt_parse_der_nocopy() + * but it calls the callback with every unsupported + * certificate extension and additionally the + * "certificate policies" extension if it contains any + * unsupported certificate policies. + * The callback must return a negative error code if it + * does not know how to handle such an extension. + * When the callback fails to parse a critical extension + * mbedtls_x509_crt_parse_der_with_ext_cb() also fails. + * When the callback fails to parse a non critical extension + * mbedtls_x509_crt_parse_der_with_ext_cb() simply skips + * the extension and continues parsing. + * Future versions of the library may invoke the callback + * in other cases, if and when the need arises. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_x509_crt_parse_der_with_ext_cb( mbedtls_x509_crt *chain, + const unsigned char *buf, + size_t buflen, + int make_copy, + mbedtls_x509_crt_ext_cb_t cb, + void *p_ctx ); + +/** + * \brief Parse a single DER formatted certificate and add it + * to the end of the provided chained list. This is a + * variant of mbedtls_x509_crt_parse_der() which takes + * temporary ownership of the CRT buffer until the CRT + * is destroyed. + * + * \param chain The pointer to the start of the CRT chain to attach to. + * When parsing the first CRT in a chain, this should point + * to an instance of ::mbedtls_x509_crt initialized through + * mbedtls_x509_crt_init(). + * \param buf The address of the readable buffer holding the DER encoded + * certificate to use. On success, this buffer must be + * retained and not be changed for the lifetime of the + * CRT chain \p chain, that is, until \p chain is destroyed + * through a call to mbedtls_x509_crt_free(). + * \param buflen The size in Bytes of \p buf. + * + * \note This call is functionally equivalent to + * mbedtls_x509_crt_parse_der(), but it avoids creating a + * copy of the input buffer at the cost of stronger lifetime + * constraints. This is useful in constrained environments + * where duplication of the CRT cannot be tolerated. + * + * \return \c 0 if successful. + * \return A negative error code on failure. + */ +int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain, + const unsigned char *buf, + size_t buflen ); + +/** + * \brief Parse one DER-encoded or one or more concatenated PEM-encoded + * certificates and add them to the chained list. + * + * For CRTs in PEM encoding, the function parses permissively: + * if at least one certificate can be parsed, the function + * returns the number of certificates for which parsing failed + * (hence \c 0 if all certificates were parsed successfully). + * If no certificate could be parsed, the function returns + * the first (negative) error encountered during parsing. + * + * PEM encoded certificates may be interleaved by other data + * such as human readable descriptions of their content, as + * long as the certificates are enclosed in the PEM specific + * '-----{BEGIN/END} CERTIFICATE-----' delimiters. + * + * \param chain The chain to which to add the parsed certificates. + * \param buf The buffer holding the certificate data in PEM or DER format. + * For certificates in PEM encoding, this may be a concatenation + * of multiple certificates; for DER encoding, the buffer must + * comprise exactly one certificate. + * \param buflen The size of \p buf, including the terminating \c NULL byte + * in case of PEM encoded data. + * + * \return \c 0 if all certificates were parsed successfully. + * \return The (positive) number of certificates that couldn't + * be parsed if parsing was partly successful (see above). + * \return A negative X509 or PEM error code otherwise. + * + */ +int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen ); + +#if defined(MBEDTLS_FS_IO) +/** + * \brief Load one or more certificates and add them + * to the chained list. Parses permissively. If some + * certificates can be parsed, the result is the number + * of failed certificates it encountered. If none complete + * correctly, the first error is returned. + * + * \param chain points to the start of the chain + * \param path filename to read the certificates from + * + * \return 0 if all certificates parsed successfully, a positive number + * if partly successful or a specific X509 or PEM error code + */ +int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path ); + +/** + * \brief Load one or more certificate files from a path and add them + * to the chained list. Parses permissively. If some + * certificates can be parsed, the result is the number + * of failed certificates it encountered. If none complete + * correctly, the first error is returned. + * + * \param chain points to the start of the chain + * \param path directory / folder to read the certificate files from + * + * \return 0 if all certificates parsed successfully, a positive number + * if partly successful or a specific X509 or PEM error code + */ +int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path ); + +#endif /* MBEDTLS_FS_IO */ +/** + * \brief This function parses an item in the SubjectAlternativeNames + * extension. + * + * \param san_buf The buffer holding the raw data item of the subject + * alternative name. + * \param san The target structure to populate with the parsed presentation + * of the subject alternative name encoded in \p san_raw. + * + * \note Only "dnsName" and "otherName" of type hardware_module_name + * as defined in RFC 4180 is supported. + * + * \note This function should be called on a single raw data of + * subject alternative name. For example, after successful + * certificate parsing, one must iterate on every item in the + * \p crt->subject_alt_names sequence, and pass it to + * this function. + * + * \warning The target structure contains pointers to the raw data of the + * parsed certificate, and its lifetime is restricted by the + * lifetime of the certificate. + * + * \return \c 0 on success + * \return #MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE for an unsupported + * SAN type. + * \return Another negative value for any other failure. + */ +int mbedtls_x509_parse_subject_alt_name( const mbedtls_x509_buf *san_buf, + mbedtls_x509_subject_alternative_name *san ); + +#if !defined(MBEDTLS_X509_REMOVE_INFO) +/** + * \brief Returns an informational string about the + * certificate. + * + * \param buf Buffer to write to + * \param size Maximum size of buffer + * \param prefix A line prefix + * \param crt The X509 certificate to represent + * + * \return The length of the string written (not including the + * terminated nul byte), or a negative error code. + */ +int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix, + const mbedtls_x509_crt *crt ); + +/** + * \brief Returns an informational string about the + * verification status of a certificate. + * + * \param buf Buffer to write to + * \param size Maximum size of buffer + * \param prefix A line prefix + * \param flags Verification flags created by mbedtls_x509_crt_verify() + * + * \return The length of the string written (not including the + * terminated nul byte), or a negative error code. + */ +int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix, + uint32_t flags ); +#endif /* !MBEDTLS_X509_REMOVE_INFO */ + +/** + * \brief Verify a chain of certificates. + * + * The verify callback is a user-supplied callback that + * can clear / modify / add flags for a certificate. If set, + * the verification callback is called for each + * certificate in the chain (from the trust-ca down to the + * presented crt). The parameters for the callback are: + * (void *parameter, mbedtls_x509_crt *crt, int certificate_depth, + * int *flags). With the flags representing current flags for + * that specific certificate and the certificate depth from + * the bottom (Peer cert depth = 0). + * + * All flags left after returning from the callback + * are also returned to the application. The function should + * return 0 for anything (including invalid certificates) + * other than fatal error, as a non-zero return code + * immediately aborts the verification process. For fatal + * errors, a specific error code should be used (different + * from MBEDTLS_ERR_X509_CERT_VERIFY_FAILED which should not + * be returned at this point), or MBEDTLS_ERR_X509_FATAL_ERROR + * can be used if no better code is available. + * + * \note In case verification failed, the results can be displayed + * using \c mbedtls_x509_crt_verify_info() + * + * \note Same as \c mbedtls_x509_crt_verify_with_profile() with the + * default security profile. + * + * \note It is your responsibility to provide up-to-date CRLs for + * all trusted CAs. If no CRL is provided for the CA that was + * used to sign the certificate, CRL verification is skipped + * silently, that is *without* setting any flag. + * + * \note The \c trust_ca list can contain two types of certificates: + * (1) those of trusted root CAs, so that certificates + * chaining up to those CAs will be trusted, and (2) + * self-signed end-entity certificates to be trusted (for + * specific peers you know) - in that case, the self-signed + * certificate doesn't need to have the CA bit set. + * + * \param crt The certificate chain to be verified. + * \param trust_ca The list of trusted CAs. + * \param ca_crl The list of CRLs for trusted CAs. + * \param cn The expected Common Name. This will be checked to be + * present in the certificate's subjectAltNames extension or, + * if this extension is absent, as a CN component in its + * Subject name. Currently only DNS names are supported. This + * may be \c NULL if the CN need not be verified. + * \param flags The address at which to store the result of the verification. + * If the verification couldn't be completed, the flag value is + * set to (uint32_t) -1. + * \param f_vrfy The verification callback to use. See the documentation + * of mbedtls_x509_crt_verify() for more information. + * \param p_vrfy The context to be passed to \p f_vrfy. + * + * \return \c 0 if the chain is valid with respect to the + * passed CN, CAs, CRLs and security profile. + * \return #MBEDTLS_ERR_X509_CERT_VERIFY_FAILED in case the + * certificate chain verification failed. In this case, + * \c *flags will have one or more + * \c MBEDTLS_X509_BADCERT_XXX or \c MBEDTLS_X509_BADCRL_XXX + * flags set. + * \return Another negative error code in case of a fatal error + * encountered during the verification process. + */ +int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt, + mbedtls_x509_crt *trust_ca, + mbedtls_x509_crl *ca_crl, + const char *cn, uint32_t *flags, + int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), + void *p_vrfy ); + +/** + * \brief Verify a chain of certificates with respect to + * a configurable security profile. + * + * \note Same as \c mbedtls_x509_crt_verify(), but with explicit + * security profile. + * + * \note The restrictions on keys (RSA minimum size, allowed curves + * for ECDSA) apply to all certificates: trusted root, + * intermediate CAs if any, and end entity certificate. + * + * \param crt The certificate chain to be verified. + * \param trust_ca The list of trusted CAs. + * \param ca_crl The list of CRLs for trusted CAs. + * \param profile The security profile to use for the verification. + * \param cn The expected Common Name. This may be \c NULL if the + * CN need not be verified. + * \param flags The address at which to store the result of the verification. + * If the verification couldn't be completed, the flag value is + * set to (uint32_t) -1. + * \param f_vrfy The verification callback to use. See the documentation + * of mbedtls_x509_crt_verify() for more information. + * \param p_vrfy The context to be passed to \p f_vrfy. + * + * \return \c 0 if the chain is valid with respect to the + * passed CN, CAs, CRLs and security profile. + * \return #MBEDTLS_ERR_X509_CERT_VERIFY_FAILED in case the + * certificate chain verification failed. In this case, + * \c *flags will have one or more + * \c MBEDTLS_X509_BADCERT_XXX or \c MBEDTLS_X509_BADCRL_XXX + * flags set. + * \return Another negative error code in case of a fatal error + * encountered during the verification process. + */ +int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt, + mbedtls_x509_crt *trust_ca, + mbedtls_x509_crl *ca_crl, + const mbedtls_x509_crt_profile *profile, + const char *cn, uint32_t *flags, + int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), + void *p_vrfy ); + +/** + * \brief Restartable version of \c mbedtls_crt_verify_with_profile() + * + * \note Performs the same job as \c mbedtls_crt_verify_with_profile() + * but can return early and restart according to the limit + * set with \c mbedtls_ecp_set_max_ops() to reduce blocking. + * + * \param crt The certificate chain to be verified. + * \param trust_ca The list of trusted CAs. + * \param ca_crl The list of CRLs for trusted CAs. + * \param profile The security profile to use for the verification. + * \param cn The expected Common Name. This may be \c NULL if the + * CN need not be verified. + * \param flags The address at which to store the result of the verification. + * If the verification couldn't be completed, the flag value is + * set to (uint32_t) -1. + * \param f_vrfy The verification callback to use. See the documentation + * of mbedtls_x509_crt_verify() for more information. + * \param p_vrfy The context to be passed to \p f_vrfy. + * \param rs_ctx The restart context to use. This may be set to \c NULL + * to disable restartable ECC. + * + * \return See \c mbedtls_crt_verify_with_profile(), or + * \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of + * operations was reached: see \c mbedtls_ecp_set_max_ops(). + */ +int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt, + mbedtls_x509_crt *trust_ca, + mbedtls_x509_crl *ca_crl, + const mbedtls_x509_crt_profile *profile, + const char *cn, uint32_t *flags, + int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), + void *p_vrfy, + mbedtls_x509_crt_restart_ctx *rs_ctx ); + +/** + * \brief The type of trusted certificate callbacks. + * + * Callbacks of this type are passed to and used by the CRT + * verification routine mbedtls_x509_crt_verify_with_ca_cb() + * when looking for trusted signers of a given certificate. + * + * On success, the callback returns a list of trusted + * certificates to be considered as potential signers + * for the input certificate. + * + * \param p_ctx An opaque context passed to the callback. + * \param child The certificate for which to search a potential signer. + * This will point to a readable certificate. + * \param candidate_cas The address at which to store the address of the first + * entry in the generated linked list of candidate signers. + * This will not be \c NULL. + * + * \note The callback must only return a non-zero value on a + * fatal error. If, in contrast, the search for a potential + * signer completes without a single candidate, the + * callback must return \c 0 and set \c *candidate_cas + * to \c NULL. + * + * \return \c 0 on success. In this case, \c *candidate_cas points + * to a heap-allocated linked list of instances of + * ::mbedtls_x509_crt, and ownership of this list is passed + * to the caller. + * \return A negative error code on failure. + */ +typedef int (*mbedtls_x509_crt_ca_cb_t)( void *p_ctx, + mbedtls_x509_crt const *child, + mbedtls_x509_crt **candidate_cas ); + +#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) +/** + * \brief Version of \c mbedtls_x509_crt_verify_with_profile() which + * uses a callback to acquire the list of trusted CA + * certificates. + * + * \param crt The certificate chain to be verified. + * \param f_ca_cb The callback to be used to query for potential signers + * of a given child certificate. See the documentation of + * ::mbedtls_x509_crt_ca_cb_t for more information. + * \param p_ca_cb The opaque context to be passed to \p f_ca_cb. + * \param profile The security profile for the verification. + * \param cn The expected Common Name. This may be \c NULL if the + * CN need not be verified. + * \param flags The address at which to store the result of the verification. + * If the verification couldn't be completed, the flag value is + * set to (uint32_t) -1. + * \param f_vrfy The verification callback to use. See the documentation + * of mbedtls_x509_crt_verify() for more information. + * \param p_vrfy The context to be passed to \p f_vrfy. + * + * \return See \c mbedtls_crt_verify_with_profile(). + */ +int mbedtls_x509_crt_verify_with_ca_cb( mbedtls_x509_crt *crt, + mbedtls_x509_crt_ca_cb_t f_ca_cb, + void *p_ca_cb, + const mbedtls_x509_crt_profile *profile, + const char *cn, uint32_t *flags, + int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), + void *p_vrfy ); + +#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ + +/** + * \brief Check usage of certificate against keyUsage extension. + * + * \param crt Leaf certificate used. + * \param usage Intended usage(s) (eg MBEDTLS_X509_KU_KEY_ENCIPHERMENT + * before using the certificate to perform an RSA key + * exchange). + * + * \note Except for decipherOnly and encipherOnly, a bit set in the + * usage argument means this bit MUST be set in the + * certificate. For decipherOnly and encipherOnly, it means + * that bit MAY be set. + * + * \return 0 is these uses of the certificate are allowed, + * MBEDTLS_ERR_X509_BAD_INPUT_DATA if the keyUsage extension + * is present but does not match the usage argument. + * + * \note You should only call this function on leaf certificates, on + * (intermediate) CAs the keyUsage extension is automatically + * checked by \c mbedtls_x509_crt_verify(). + */ +int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt, + unsigned int usage ); + +/** + * \brief Check usage of certificate against extendedKeyUsage. + * + * \param crt Leaf certificate used. + * \param usage_oid Intended usage (eg MBEDTLS_OID_SERVER_AUTH or + * MBEDTLS_OID_CLIENT_AUTH). + * \param usage_len Length of usage_oid (eg given by MBEDTLS_OID_SIZE()). + * + * \return 0 if this use of the certificate is allowed, + * MBEDTLS_ERR_X509_BAD_INPUT_DATA if not. + * + * \note Usually only makes sense on leaf certificates. + */ +int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt, + const char *usage_oid, + size_t usage_len ); + +#if defined(MBEDTLS_X509_CRL_PARSE_C) +/** + * \brief Verify the certificate revocation status + * + * \param crt a certificate to be verified + * \param crl the CRL to verify against + * + * \return 1 if the certificate is revoked, 0 otherwise + * + */ +int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl ); +#endif /* MBEDTLS_X509_CRL_PARSE_C */ + +/** + * \brief Initialize a certificate (chain) + * + * \param crt Certificate chain to initialize + */ +void mbedtls_x509_crt_init( mbedtls_x509_crt *crt ); + +/** + * \brief Unallocate all certificate data + * + * \param crt Certificate chain to free + */ +void mbedtls_x509_crt_free( mbedtls_x509_crt *crt ); + +#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) +/** + * \brief Initialize a restart context + */ +void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx ); + +/** + * \brief Free the components of a restart context + */ +void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx ); +#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +/** + * \brief Query certificate for given extension type + * + * \param[in] ctx Certificate context to be queried, must not be \c NULL + * \param ext_type Extension type being queried for, must be a valid + * extension type. Must be one of the MBEDTLS_X509_EXT_XXX + * values + * + * \return 0 if the given extension type is not present, + * non-zero otherwise + */ +static inline int mbedtls_x509_crt_has_ext_type( const mbedtls_x509_crt *ctx, + int ext_type ) +{ + return ctx->MBEDTLS_PRIVATE(ext_types) & ext_type; +} + +/** \} name Structures and functions for parsing and writing X.509 certificates */ + +#if defined(MBEDTLS_X509_CRT_WRITE_C) +/** + * \brief Initialize a CRT writing context + * + * \param ctx CRT context to initialize + */ +void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx ); + +/** + * \brief Set the version for a Certificate + * Default: MBEDTLS_X509_CRT_VERSION_3 + * + * \param ctx CRT context to use + * \param version version to set (MBEDTLS_X509_CRT_VERSION_1, MBEDTLS_X509_CRT_VERSION_2 or + * MBEDTLS_X509_CRT_VERSION_3) + */ +void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, int version ); + +/** + * \brief Set the serial number for a Certificate. + * + * \param ctx CRT context to use + * \param serial serial number to set + * + * \return 0 if successful + */ +int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, const mbedtls_mpi *serial ); + +/** + * \brief Set the validity period for a Certificate + * Timestamps should be in string format for UTC timezone + * i.e. "YYYYMMDDhhmmss" + * e.g. "20131231235959" for December 31st 2013 + * at 23:59:59 + * + * \param ctx CRT context to use + * \param not_before not_before timestamp + * \param not_after not_after timestamp + * + * \return 0 if timestamp was parsed successfully, or + * a specific error code + */ +int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, const char *not_before, + const char *not_after ); + +/** + * \brief Set the issuer name for a Certificate + * Issuer names should contain a comma-separated list + * of OID types and values: + * e.g. "C=UK,O=ARM,CN=mbed TLS CA" + * + * \param ctx CRT context to use + * \param issuer_name issuer name to set + * + * \return 0 if issuer name was parsed successfully, or + * a specific error code + */ +int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx, + const char *issuer_name ); + +/** + * \brief Set the subject name for a Certificate + * Subject names should contain a comma-separated list + * of OID types and values: + * e.g. "C=UK,O=ARM,CN=mbed TLS Server 1" + * + * \param ctx CRT context to use + * \param subject_name subject name to set + * + * \return 0 if subject name was parsed successfully, or + * a specific error code + */ +int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx, + const char *subject_name ); + +/** + * \brief Set the subject public key for the certificate + * + * \param ctx CRT context to use + * \param key public key to include + */ +void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key ); + +/** + * \brief Set the issuer key used for signing the certificate + * + * \param ctx CRT context to use + * \param key private key to sign with + */ +void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key ); + +/** + * \brief Set the MD algorithm to use for the signature + * (e.g. MBEDTLS_MD_SHA1) + * + * \param ctx CRT context to use + * \param md_alg MD algorithm to use + */ +void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, mbedtls_md_type_t md_alg ); + +/** + * \brief Generic function to add to or replace an extension in the + * CRT + * + * \param ctx CRT context to use + * \param oid OID of the extension + * \param oid_len length of the OID + * \param critical if the extension is critical (per the RFC's definition) + * \param val value of the extension OCTET STRING + * \param val_len length of the value data + * + * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED + */ +int 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 ); + +/** + * \brief Set the basicConstraints extension for a CRT + * + * \param ctx CRT context to use + * \param is_ca is this a CA certificate + * \param max_pathlen maximum length of certificate chains below this + * certificate (only for CA certificates, -1 is + * unlimited) + * + * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED + */ +int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx, + int is_ca, int max_pathlen ); + +#if defined(MBEDTLS_HAS_ALG_SHA_1_VIA_LOWLEVEL_OR_PSA) +/** + * \brief Set the subjectKeyIdentifier extension for a CRT + * Requires that mbedtls_x509write_crt_set_subject_key() has been + * called before + * + * \param ctx CRT context to use + * + * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED + */ +int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx ); + +/** + * \brief Set the authorityKeyIdentifier extension for a CRT + * Requires that mbedtls_x509write_crt_set_issuer_key() has been + * called before + * + * \param ctx CRT context to use + * + * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED + */ +int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx ); +#endif /* MBEDTLS_HAS_ALG_SHA_1_VIA_LOWLEVEL_OR_PSA */ + +/** + * \brief Set the Key Usage Extension flags + * (e.g. MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_KEY_CERT_SIGN) + * + * \param ctx CRT context to use + * \param key_usage key usage flags to set + * + * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED + */ +int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx, + unsigned int key_usage ); + +/** + * \brief Set the Extended Key Usage Extension + * (e.g. MBEDTLS_OID_SERVER_AUTH) + * + * \param ctx CRT context to use + * \param exts extended key usage extensions to set, a sequence of + * MBEDTLS_ASN1_OID objects + * + * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED + */ +int mbedtls_x509write_crt_set_ext_key_usage( mbedtls_x509write_cert *ctx, + const mbedtls_asn1_sequence *exts ); + +/** + * \brief Set the Netscape Cert Type flags + * (e.g. MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT | MBEDTLS_X509_NS_CERT_TYPE_EMAIL) + * + * \param ctx CRT context to use + * \param ns_cert_type Netscape Cert Type flags to set + * + * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED + */ +int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx, + unsigned char ns_cert_type ); + +/** + * \brief Free the contents of a CRT write context + * + * \param ctx CRT context to free + */ +void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx ); + +/** + * \brief Write a built up certificate to a X509 DER structure + * Note: data is written at the end of the buffer! Use the + * return value to determine where you should start + * using the buffer + * + * \param ctx certificate to write away + * \param buf buffer to write to + * \param size size of the buffer + * \param f_rng RNG function. This must not be \c NULL. + * \param p_rng RNG parameter + * + * \return length of data written if successful, or a specific + * error code + * + * \note \p f_rng is used for the signature operation. + */ +int 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 ); + +#if defined(MBEDTLS_PEM_WRITE_C) +/** + * \brief Write a built up certificate to a X509 PEM string + * + * \param ctx certificate to write away + * \param buf buffer to write to + * \param size size of the buffer + * \param f_rng RNG function. This must not be \c NULL. + * \param p_rng RNG parameter + * + * \return 0 if successful, or a specific error code + * + * \note \p f_rng is used for the signature operation. + */ +int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size, + int (*f_rng)(void *, unsigned char *, size_t), + void *p_rng ); +#endif /* MBEDTLS_PEM_WRITE_C */ +#endif /* MBEDTLS_X509_CRT_WRITE_C */ + +/** \} addtogroup x509_module */ + +#ifdef __cplusplus +} +#endif + +#endif /* mbedtls_x509_crt.h */ |