+++ /dev/null
-/**
- * \file x509_crt.h
- *
- * \brief X.509 certificate parsing and writing
- *
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: GPL-2.0
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * This file is part of mbed TLS (https://tls.mbed.org)
- */
-#ifndef MBEDTLS_X509_CRT_H
-#define MBEDTLS_X509_CRT_H
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#include "x509.h"
-#include "x509_crl.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.
- */
-typedef struct mbedtls_x509_crt
-{
- 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_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 Subject Alternative Names (Only dNSName supported). */
-
- int ext_types; /**< Bit string containing detected and parsed extensions */
- int ca_istrue; /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */
- 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+ */
-
- unsigned int 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 ns_cert_type; /**< Optional Netscape certificate type extension value: See the values in x509.h */
-
- mbedtls_x509_buf sig; /**< Signature: hash of the tbs part signed with the private key. */
- mbedtls_md_type_t sig_md; /**< Internal representation of the MD algorithm of the signature algorithm, e.g. MBEDTLS_MD_SHA256 */
- mbedtls_pk_type_t sig_pk; /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. MBEDTLS_PK_RSA */
- void *sig_opts; /**< Signature options to be passed to mbedtls_pk_verify_ext(), e.g. for RSASSA-PSS */
-
- struct mbedtls_x509_crt *next; /**< Next certificate in the CA-chain. */
-}
-mbedtls_x509_crt;
-
-/**
- * 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().
- */
-typedef struct
-{
- uint32_t allowed_mds; /**< MDs for signatures */
- uint32_t allowed_pks; /**< PK algs for signatures */
- 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
-
-/**
- * Container for writing a certificate (CRT)
- */
-typedef struct mbedtls_x509write_cert
-{
- int version;
- mbedtls_mpi serial;
- mbedtls_pk_context *subject_key;
- mbedtls_pk_context *issuer_key;
- mbedtls_asn1_named_data *subject;
- mbedtls_asn1_named_data *issuer;
- mbedtls_md_type_t md_alg;
- char not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
- char not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
- mbedtls_asn1_named_data *extensions;
-}
-mbedtls_x509write_cert;
-
-#if defined(MBEDTLS_X509_CRT_PARSE_C)
-/**
- * Default security profile. Should provide a good balance between security
- * and compatibility with current deployments.
- */
-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 RSA-2048.
- */
-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;
-
-/**
- * \brief Parse a single DER formatted certificate and add it
- * to the chained list.
- *
- * \param chain points to the start of the chain
- * \param buf buffer holding the certificate DER data
- * \param buflen size of the buffer
- *
- * \return 0 if successful, or a specific X509 or PEM error code
- */
-int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf,
- size_t buflen );
-
-/**
- * \brief Parse 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 buf buffer holding the certificate data in PEM or DER format
- * \param buflen size of the buffer
- * (including the terminating null byte for PEM data)
- *
- * \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( 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 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 );
-
-/**
- * \brief Verify the certificate signature
- *
- * 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.
- *
- * \param crt a certificate (chain) to be verified
- * \param trust_ca the list of trusted CAs
- * \param ca_crl the list of CRLs for trusted CAs (see note above)
- * \param cn expected Common Name (can be set to
- * NULL if the CN must not be verified)
- * \param flags result of the verification
- * \param f_vrfy verification function
- * \param p_vrfy verification parameter
- *
- * \return 0 (and flags set to 0) if the chain was verified and valid,
- * MBEDTLS_ERR_X509_CERT_VERIFY_FAILED if the chain was verified
- * but found to be invalid, in which case *flags will have one
- * or more MBEDTLS_X509_BADCERT_XXX or MBEDTLS_X509_BADCRL_XXX
- * flags set, or another error (and flags set to 0xffffffff)
- * 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 the certificate signature according to 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 a 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 security profile for verification
- * \param cn expected Common Name (can be set to
- * NULL if the CN must not be verified)
- * \param flags result of the verification
- * \param f_vrfy verification function
- * \param p_vrfy verification parameter
- *
- * \return 0 if successful or MBEDTLS_ERR_X509_CERT_VERIFY_FAILED
- * in which case *flags will have one or more
- * MBEDTLS_X509_BADCERT_XXX or MBEDTLS_X509_BADCRL_XXX flags
- * set,
- * or another error 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 );
-
-#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
-/**
- * \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 );
-#endif /* MBEDTLS_X509_CHECK_KEY_USAGE) */
-
-#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
-/**
- * \brief Check usage of certificate against extentedJeyUsage.
- *
- * \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 );
-#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) */
-
-#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 );
-#endif /* MBEDTLS_X509_CRT_PARSE_C */
-
-/* \} name */
-/* \} addtogroup x509_module */
-
-#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 verion 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
- * inlimited)
- *
- * \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_SHA1_C)
-/**
- * \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_SHA1_C */
-
-/**
- * \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 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 (for signature, see note)
- * \param p_rng RNG parameter
- *
- * \return length of data written if successful, or a specific
- * error code
- *
- * \note f_rng may be NULL if RSA is used for signature and the
- * signature is made offline (otherwise f_rng is desirable
- * for countermeasures against timing attacks).
- * ECDSA signatures always require a non-NULL f_rng.
- */
-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 (for signature, see note)
- * \param p_rng RNG parameter
- *
- * \return 0 if successful, or a specific error code
- *
- * \note f_rng may be NULL if RSA is used for signature and the
- * signature is made offline (otherwise f_rng is desirable
- * for countermeasures against timing attacks).
- * ECDSA signatures always require a non-NULL f_rng.
- */
-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 */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* mbedtls_x509_crt.h */
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