4 * \brief X.509 certificate parsing and writing
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7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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8 * SPDX-License-Identifier: Apache-2.0
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10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
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11 * not use this file except in compliance with the License.
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12 * You may obtain a copy of the License at
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14 * http://www.apache.org/licenses/LICENSE-2.0
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16 * Unless required by applicable law or agreed to in writing, software
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17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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19 * See the License for the specific language governing permissions and
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20 * limitations under the License.
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22 * This file is part of mbed TLS (https://tls.mbed.org)
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24 #ifndef MBEDTLS_X509_CRT_H
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25 #define MBEDTLS_X509_CRT_H
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27 #if !defined(MBEDTLS_CONFIG_FILE)
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30 #include MBEDTLS_CONFIG_FILE
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34 #include "x509_crl.h"
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37 * \addtogroup x509_module
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46 * \name Structures and functions for parsing and writing X.509 certificates
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51 * Container for an X.509 certificate. The certificate may be chained.
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53 typedef struct mbedtls_x509_crt
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55 int own_buffer; /**< Indicates if \c raw is owned
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56 * by the structure or not. */
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57 mbedtls_x509_buf raw; /**< The raw certificate data (DER). */
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58 mbedtls_x509_buf tbs; /**< The raw certificate body (DER). The part that is To Be Signed. */
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60 int version; /**< The X.509 version. (1=v1, 2=v2, 3=v3) */
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61 mbedtls_x509_buf serial; /**< Unique id for certificate issued by a specific CA. */
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62 mbedtls_x509_buf sig_oid; /**< Signature algorithm, e.g. sha1RSA */
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64 mbedtls_x509_buf issuer_raw; /**< The raw issuer data (DER). Used for quick comparison. */
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65 mbedtls_x509_buf subject_raw; /**< The raw subject data (DER). Used for quick comparison. */
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67 mbedtls_x509_name issuer; /**< The parsed issuer data (named information object). */
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68 mbedtls_x509_name subject; /**< The parsed subject data (named information object). */
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70 mbedtls_x509_time valid_from; /**< Start time of certificate validity. */
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71 mbedtls_x509_time valid_to; /**< End time of certificate validity. */
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73 mbedtls_x509_buf pk_raw;
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74 mbedtls_pk_context pk; /**< Container for the public key context. */
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76 mbedtls_x509_buf issuer_id; /**< Optional X.509 v2/v3 issuer unique identifier. */
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77 mbedtls_x509_buf subject_id; /**< Optional X.509 v2/v3 subject unique identifier. */
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78 mbedtls_x509_buf v3_ext; /**< Optional X.509 v3 extensions. */
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79 mbedtls_x509_sequence subject_alt_names; /**< Optional list of raw entries of Subject Alternative Names extension (currently only dNSName and OtherName are listed). */
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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). */
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83 int ext_types; /**< Bit string containing detected and parsed extensions */
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84 int ca_istrue; /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */
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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+ */
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87 unsigned int key_usage; /**< Optional key usage extension value: See the values in x509.h */
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89 mbedtls_x509_sequence ext_key_usage; /**< Optional list of extended key usage OIDs. */
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91 unsigned char ns_cert_type; /**< Optional Netscape certificate type extension value: See the values in x509.h */
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93 mbedtls_x509_buf sig; /**< Signature: hash of the tbs part signed with the private key. */
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94 mbedtls_md_type_t sig_md; /**< Internal representation of the MD algorithm of the signature algorithm, e.g. MBEDTLS_MD_SHA256 */
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95 mbedtls_pk_type_t sig_pk; /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. MBEDTLS_PK_RSA */
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96 void *sig_opts; /**< Signature options to be passed to mbedtls_pk_verify_ext(), e.g. for RSASSA-PSS */
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98 struct mbedtls_x509_crt *next; /**< Next certificate in the CA-chain. */
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103 * From RFC 5280 section 4.2.1.6:
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104 * OtherName ::= SEQUENCE {
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105 * type-id OBJECT IDENTIFIER,
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106 * value [0] EXPLICIT ANY DEFINED BY type-id }
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108 typedef struct mbedtls_x509_san_other_name
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111 * The type_id is an OID as deifned in RFC 5280.
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112 * To check the value of the type id, you should use
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113 * \p MBEDTLS_OID_CMP with a known OID mbedtls_x509_buf.
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115 mbedtls_x509_buf type_id; /**< The type id. */
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119 * From RFC 4108 section 5:
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120 * HardwareModuleName ::= SEQUENCE {
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121 * hwType OBJECT IDENTIFIER,
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122 * hwSerialNum OCTET STRING }
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126 mbedtls_x509_buf oid; /**< The object identifier. */
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127 mbedtls_x509_buf val; /**< The named value. */
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129 hardware_module_name;
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133 mbedtls_x509_san_other_name;
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136 * A structure for holding the parsed Subject Alternative Name, according to type
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138 typedef struct mbedtls_x509_subject_alternative_name
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140 int type; /**< The SAN type, value of MBEDTLS_X509_SAN_XXX. */
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142 mbedtls_x509_san_other_name other_name; /**< The otherName supported type. */
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143 mbedtls_x509_buf unstructured_name; /**< The buffer for the un constructed types. Only dnsName currently supported */
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145 san; /**< A union of the supported SAN types */
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147 mbedtls_x509_subject_alternative_name;
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150 * Build flag from an algorithm/curve identifier (pk, md, ecp)
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151 * Since 0 is always XXX_NONE, ignore it.
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153 #define MBEDTLS_X509_ID_FLAG( id ) ( 1 << ( (id) - 1 ) )
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156 * Security profile for certificate verification.
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158 * All lists are bitfields, built by ORing flags from MBEDTLS_X509_ID_FLAG().
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160 typedef struct mbedtls_x509_crt_profile
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162 uint32_t allowed_mds; /**< MDs for signatures */
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163 uint32_t allowed_pks; /**< PK algs for signatures */
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164 uint32_t allowed_curves; /**< Elliptic curves for ECDSA */
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165 uint32_t rsa_min_bitlen; /**< Minimum size for RSA keys */
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167 mbedtls_x509_crt_profile;
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169 #define MBEDTLS_X509_CRT_VERSION_1 0
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170 #define MBEDTLS_X509_CRT_VERSION_2 1
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171 #define MBEDTLS_X509_CRT_VERSION_3 2
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173 #define MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN 32
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174 #define MBEDTLS_X509_RFC5280_UTC_TIME_LEN 15
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176 #if !defined( MBEDTLS_X509_MAX_FILE_PATH_LEN )
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177 #define MBEDTLS_X509_MAX_FILE_PATH_LEN 512
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181 * Container for writing a certificate (CRT)
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183 typedef struct mbedtls_x509write_cert
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186 mbedtls_mpi serial;
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187 mbedtls_pk_context *subject_key;
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188 mbedtls_pk_context *issuer_key;
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189 mbedtls_asn1_named_data *subject;
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190 mbedtls_asn1_named_data *issuer;
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191 mbedtls_md_type_t md_alg;
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192 char not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
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193 char not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN + 1];
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194 mbedtls_asn1_named_data *extensions;
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196 mbedtls_x509write_cert;
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199 * Item in a verification chain: cert and flags for it
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202 mbedtls_x509_crt *crt;
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204 } mbedtls_x509_crt_verify_chain_item;
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207 * Max size of verification chain: end-entity + intermediates + trusted root
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209 #define MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 )
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212 * Verification chain as built by \c mbedtls_crt_verify_chain()
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216 mbedtls_x509_crt_verify_chain_item items[MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE];
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219 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
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220 /* This stores the list of potential trusted signers obtained from
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221 * the CA callback used for the CRT verification, if configured.
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222 * We must track it somewhere because the callback passes its
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223 * ownership to the caller. */
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224 mbedtls_x509_crt *trust_ca_cb_result;
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225 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
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226 } mbedtls_x509_crt_verify_chain;
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228 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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231 * \brief Context for resuming X.509 verify operations
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235 /* for check_signature() */
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236 mbedtls_pk_restart_ctx pk;
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238 /* for find_parent_in() */
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239 mbedtls_x509_crt *parent; /* non-null iff parent_in in progress */
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240 mbedtls_x509_crt *fallback_parent;
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241 int fallback_signature_is_good;
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243 /* for find_parent() */
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244 int parent_is_trusted; /* -1 if find_parent is not in progress */
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246 /* for verify_chain() */
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249 x509_crt_rs_find_parent,
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250 } in_progress; /* none if no operation is in progress */
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252 mbedtls_x509_crt_verify_chain ver_chain;
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254 } mbedtls_x509_crt_restart_ctx;
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256 #else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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258 /* Now we can declare functions that take a pointer to that */
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259 typedef void mbedtls_x509_crt_restart_ctx;
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261 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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263 #if defined(MBEDTLS_X509_CRT_PARSE_C)
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265 * Default security profile. Should provide a good balance between security
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266 * and compatibility with current deployments.
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268 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default;
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271 * Expected next default profile. Recommended for new deployments.
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272 * Currently targets a 128-bit security level, except for RSA-2048.
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274 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next;
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277 * NSA Suite B profile.
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279 extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb;
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282 * \brief Parse a single DER formatted certificate and add it
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283 * to the end of the provided chained list.
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285 * \param chain The pointer to the start of the CRT chain to attach to.
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286 * When parsing the first CRT in a chain, this should point
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287 * to an instance of ::mbedtls_x509_crt initialized through
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288 * mbedtls_x509_crt_init().
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289 * \param buf The buffer holding the DER encoded certificate.
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290 * \param buflen The size in Bytes of \p buf.
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292 * \note This function makes an internal copy of the CRT buffer
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293 * \p buf. In particular, \p buf may be destroyed or reused
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294 * after this call returns. To avoid duplicating the CRT
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295 * buffer (at the cost of stricter lifetime constraints),
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296 * use mbedtls_x509_crt_parse_der_nocopy() instead.
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298 * \return \c 0 if successful.
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299 * \return A negative error code on failure.
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301 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
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302 const unsigned char *buf,
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306 * \brief Parse a single DER formatted certificate and add it
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307 * to the end of the provided chained list. This is a
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308 * variant of mbedtls_x509_crt_parse_der() which takes
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309 * temporary ownership of the CRT buffer until the CRT
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312 * \param chain The pointer to the start of the CRT chain to attach to.
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313 * When parsing the first CRT in a chain, this should point
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314 * to an instance of ::mbedtls_x509_crt initialized through
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315 * mbedtls_x509_crt_init().
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316 * \param buf The address of the readable buffer holding the DER encoded
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317 * certificate to use. On success, this buffer must be
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318 * retained and not be changed for the liftetime of the
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319 * CRT chain \p chain, that is, until \p chain is destroyed
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320 * through a call to mbedtls_x509_crt_free().
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321 * \param buflen The size in Bytes of \p buf.
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323 * \note This call is functionally equivalent to
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324 * mbedtls_x509_crt_parse_der(), but it avoids creating a
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325 * copy of the input buffer at the cost of stronger lifetime
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326 * constraints. This is useful in constrained environments
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327 * where duplication of the CRT cannot be tolerated.
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329 * \return \c 0 if successful.
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330 * \return A negative error code on failure.
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332 int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
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333 const unsigned char *buf,
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337 * \brief Parse one DER-encoded or one or more concatenated PEM-encoded
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338 * certificates and add them to the chained list.
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340 * For CRTs in PEM encoding, the function parses permissively:
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341 * if at least one certificate can be parsed, the function
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342 * returns the number of certificates for which parsing failed
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343 * (hence \c 0 if all certificates were parsed successfully).
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344 * If no certificate could be parsed, the function returns
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345 * the first (negative) error encountered during parsing.
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347 * PEM encoded certificates may be interleaved by other data
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348 * such as human readable descriptions of their content, as
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349 * long as the certificates are enclosed in the PEM specific
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350 * '-----{BEGIN/END} CERTIFICATE-----' delimiters.
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352 * \param chain The chain to which to add the parsed certificates.
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353 * \param buf The buffer holding the certificate data in PEM or DER format.
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354 * For certificates in PEM encoding, this may be a concatenation
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355 * of multiple certificates; for DER encoding, the buffer must
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356 * comprise exactly one certificate.
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357 * \param buflen The size of \p buf, including the terminating \c NULL byte
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358 * in case of PEM encoded data.
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360 * \return \c 0 if all certificates were parsed successfully.
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361 * \return The (positive) number of certificates that couldn't
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362 * be parsed if parsing was partly successful (see above).
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363 * \return A negative X509 or PEM error code otherwise.
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366 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen );
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368 #if defined(MBEDTLS_FS_IO)
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370 * \brief Load one or more certificates and add them
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371 * to the chained list. Parses permissively. If some
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372 * certificates can be parsed, the result is the number
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373 * of failed certificates it encountered. If none complete
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374 * correctly, the first error is returned.
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376 * \param chain points to the start of the chain
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377 * \param path filename to read the certificates from
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379 * \return 0 if all certificates parsed successfully, a positive number
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380 * if partly successful or a specific X509 or PEM error code
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382 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path );
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385 * \brief Load one or more certificate files from a path and add them
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386 * to the chained list. Parses permissively. If some
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387 * certificates can be parsed, the result is the number
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388 * of failed certificates it encountered. If none complete
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389 * correctly, the first error is returned.
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391 * \param chain points to the start of the chain
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392 * \param path directory / folder to read the certificate files from
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394 * \return 0 if all certificates parsed successfully, a positive number
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395 * if partly successful or a specific X509 or PEM error code
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397 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path );
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399 #endif /* MBEDTLS_FS_IO */
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401 * \brief This function parses an item in the SubjectAlternativeNames
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404 * \param san_buf The buffer holding the raw data item of the subject
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405 * alternative name.
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406 * \param san The target structure to populate with the parsed presentation
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407 * of the subject alternative name encoded in \p san_raw.
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409 * \note Only "dnsName" and "otherName" of type hardware_module_name
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410 * as defined in RFC 4180 is supported.
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412 * \note This function should be called on a single raw data of
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413 * subject alternative name. For example, after successful
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414 * certificate parsing, one must iterate on every item in the
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415 * \p crt->subject_alt_names sequence, and pass it to
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418 * \warning The target structure contains pointers to the raw data of the
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419 * parsed certificate, and its lifetime is restricted by the
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420 * lifetime of the certificate.
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422 * \return \c 0 on success
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423 * \return #MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE for an unsupported
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425 * \return Another negative value for any other failure.
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427 int mbedtls_x509_parse_subject_alt_name( const mbedtls_x509_buf *san_buf,
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428 mbedtls_x509_subject_alternative_name *san );
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430 * \brief Returns an informational string about the
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433 * \param buf Buffer to write to
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434 * \param size Maximum size of buffer
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435 * \param prefix A line prefix
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436 * \param crt The X509 certificate to represent
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438 * \return The length of the string written (not including the
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439 * terminated nul byte), or a negative error code.
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441 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
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442 const mbedtls_x509_crt *crt );
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445 * \brief Returns an informational string about the
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446 * verification status of a certificate.
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448 * \param buf Buffer to write to
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449 * \param size Maximum size of buffer
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450 * \param prefix A line prefix
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451 * \param flags Verification flags created by mbedtls_x509_crt_verify()
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453 * \return The length of the string written (not including the
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454 * terminated nul byte), or a negative error code.
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456 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
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460 * \brief Verify a chain of certificates.
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462 * The verify callback is a user-supplied callback that
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463 * can clear / modify / add flags for a certificate. If set,
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464 * the verification callback is called for each
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465 * certificate in the chain (from the trust-ca down to the
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466 * presented crt). The parameters for the callback are:
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467 * (void *parameter, mbedtls_x509_crt *crt, int certificate_depth,
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468 * int *flags). With the flags representing current flags for
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469 * that specific certificate and the certificate depth from
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470 * the bottom (Peer cert depth = 0).
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472 * All flags left after returning from the callback
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473 * are also returned to the application. The function should
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474 * return 0 for anything (including invalid certificates)
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475 * other than fatal error, as a non-zero return code
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476 * immediately aborts the verification process. For fatal
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477 * errors, a specific error code should be used (different
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478 * from MBEDTLS_ERR_X509_CERT_VERIFY_FAILED which should not
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479 * be returned at this point), or MBEDTLS_ERR_X509_FATAL_ERROR
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480 * can be used if no better code is available.
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482 * \note In case verification failed, the results can be displayed
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483 * using \c mbedtls_x509_crt_verify_info()
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485 * \note Same as \c mbedtls_x509_crt_verify_with_profile() with the
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486 * default security profile.
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488 * \note It is your responsibility to provide up-to-date CRLs for
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489 * all trusted CAs. If no CRL is provided for the CA that was
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490 * used to sign the certificate, CRL verification is skipped
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491 * silently, that is *without* setting any flag.
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493 * \note The \c trust_ca list can contain two types of certificates:
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494 * (1) those of trusted root CAs, so that certificates
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495 * chaining up to those CAs will be trusted, and (2)
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496 * self-signed end-entity certificates to be trusted (for
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497 * specific peers you know) - in that case, the self-signed
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498 * certificate doesn't need to have the CA bit set.
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500 * \param crt The certificate chain to be verified.
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501 * \param trust_ca The list of trusted CAs.
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502 * \param ca_crl The list of CRLs for trusted CAs.
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503 * \param cn The expected Common Name. This may be \c NULL if the
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504 * CN need not be verified.
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505 * \param flags The address at which to store the result of the verification.
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506 * If the verification couldn't be completed, the flag value is
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507 * set to (uint32_t) -1.
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508 * \param f_vrfy The verification callback to use. See the documentation
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509 * of mbedtls_x509_crt_verify() for more information.
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510 * \param p_vrfy The context to be passed to \p f_vrfy.
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512 * \return \c 0 if the chain is valid with respect to the
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513 * passed CN, CAs, CRLs and security profile.
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514 * \return #MBEDTLS_ERR_X509_CERT_VERIFY_FAILED in case the
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515 * certificate chain verification failed. In this case,
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516 * \c *flags will have one or more
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517 * \c MBEDTLS_X509_BADCERT_XXX or \c MBEDTLS_X509_BADCRL_XXX
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519 * \return Another negative error code in case of a fatal error
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520 * encountered during the verification process.
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522 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
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523 mbedtls_x509_crt *trust_ca,
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524 mbedtls_x509_crl *ca_crl,
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525 const char *cn, uint32_t *flags,
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526 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
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530 * \brief Verify a chain of certificates with respect to
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531 * a configurable security profile.
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533 * \note Same as \c mbedtls_x509_crt_verify(), but with explicit
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534 * security profile.
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536 * \note The restrictions on keys (RSA minimum size, allowed curves
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537 * for ECDSA) apply to all certificates: trusted root,
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538 * intermediate CAs if any, and end entity certificate.
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540 * \param crt The certificate chain to be verified.
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541 * \param trust_ca The list of trusted CAs.
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542 * \param ca_crl The list of CRLs for trusted CAs.
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543 * \param profile The security profile to use for the verification.
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544 * \param cn The expected Common Name. This may be \c NULL if the
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545 * CN need not be verified.
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546 * \param flags The address at which to store the result of the verification.
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547 * If the verification couldn't be completed, the flag value is
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548 * set to (uint32_t) -1.
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549 * \param f_vrfy The verification callback to use. See the documentation
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550 * of mbedtls_x509_crt_verify() for more information.
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551 * \param p_vrfy The context to be passed to \p f_vrfy.
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553 * \return \c 0 if the chain is valid with respect to the
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554 * passed CN, CAs, CRLs and security profile.
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555 * \return #MBEDTLS_ERR_X509_CERT_VERIFY_FAILED in case the
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556 * certificate chain verification failed. In this case,
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557 * \c *flags will have one or more
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558 * \c MBEDTLS_X509_BADCERT_XXX or \c MBEDTLS_X509_BADCRL_XXX
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560 * \return Another negative error code in case of a fatal error
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561 * encountered during the verification process.
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563 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
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564 mbedtls_x509_crt *trust_ca,
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565 mbedtls_x509_crl *ca_crl,
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566 const mbedtls_x509_crt_profile *profile,
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567 const char *cn, uint32_t *flags,
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568 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
\r
572 * \brief Restartable version of \c mbedtls_crt_verify_with_profile()
\r
574 * \note Performs the same job as \c mbedtls_crt_verify_with_profile()
\r
575 * but can return early and restart according to the limit
\r
576 * set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
\r
578 * \param crt The certificate chain to be verified.
\r
579 * \param trust_ca The list of trusted CAs.
\r
580 * \param ca_crl The list of CRLs for trusted CAs.
\r
581 * \param profile The security profile to use for the verification.
\r
582 * \param cn The expected Common Name. This may be \c NULL if the
\r
583 * CN need not be verified.
\r
584 * \param flags The address at which to store the result of the verification.
\r
585 * If the verification couldn't be completed, the flag value is
\r
586 * set to (uint32_t) -1.
\r
587 * \param f_vrfy The verification callback to use. See the documentation
\r
588 * of mbedtls_x509_crt_verify() for more information.
\r
589 * \param p_vrfy The context to be passed to \p f_vrfy.
\r
590 * \param rs_ctx The restart context to use. This may be set to \c NULL
\r
591 * to disable restartable ECC.
\r
593 * \return See \c mbedtls_crt_verify_with_profile(), or
\r
594 * \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
\r
595 * operations was reached: see \c mbedtls_ecp_set_max_ops().
\r
597 int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt,
\r
598 mbedtls_x509_crt *trust_ca,
\r
599 mbedtls_x509_crl *ca_crl,
\r
600 const mbedtls_x509_crt_profile *profile,
\r
601 const char *cn, uint32_t *flags,
\r
602 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
\r
604 mbedtls_x509_crt_restart_ctx *rs_ctx );
\r
607 * \brief The type of trusted certificate callbacks.
\r
609 * Callbacks of this type are passed to and used by the CRT
\r
610 * verification routine mbedtls_x509_crt_verify_with_ca_cb()
\r
611 * when looking for trusted signers of a given certificate.
\r
613 * On success, the callback returns a list of trusted
\r
614 * certificates to be considered as potential signers
\r
615 * for the input certificate.
\r
617 * \param p_ctx An opaque context passed to the callback.
\r
618 * \param child The certificate for which to search a potential signer.
\r
619 * This will point to a readable certificate.
\r
620 * \param candidate_cas The address at which to store the address of the first
\r
621 * entry in the generated linked list of candidate signers.
\r
622 * This will not be \c NULL.
\r
624 * \note The callback must only return a non-zero value on a
\r
625 * fatal error. If, in contrast, the search for a potential
\r
626 * signer completes without a single candidate, the
\r
627 * callback must return \c 0 and set \c *candidate_cas
\r
630 * \return \c 0 on success. In this case, \c *candidate_cas points
\r
631 * to a heap-allocated linked list of instances of
\r
632 * ::mbedtls_x509_crt, and ownership of this list is passed
\r
634 * \return A negative error code on failure.
\r
636 typedef int (*mbedtls_x509_crt_ca_cb_t)( void *p_ctx,
\r
637 mbedtls_x509_crt const *child,
\r
638 mbedtls_x509_crt **candidate_cas );
\r
640 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
\r
642 * \brief Version of \c mbedtls_x509_crt_verify_with_profile() which
\r
643 * uses a callback to acquire the list of trusted CA
\r
646 * \param crt The certificate chain to be verified.
\r
647 * \param f_ca_cb The callback to be used to query for potential signers
\r
648 * of a given child certificate. See the documentation of
\r
649 * ::mbedtls_x509_crt_ca_cb_t for more information.
\r
650 * \param p_ca_cb The opaque context to be passed to \p f_ca_cb.
\r
651 * \param profile The security profile for the verification.
\r
652 * \param cn The expected Common Name. This may be \c NULL if the
\r
653 * CN need not be verified.
\r
654 * \param flags The address at which to store the result of the verification.
\r
655 * If the verification couldn't be completed, the flag value is
\r
656 * set to (uint32_t) -1.
\r
657 * \param f_vrfy The verification callback to use. See the documentation
\r
658 * of mbedtls_x509_crt_verify() for more information.
\r
659 * \param p_vrfy The context to be passed to \p f_vrfy.
\r
661 * \return See \c mbedtls_crt_verify_with_profile().
\r
663 int mbedtls_x509_crt_verify_with_ca_cb( mbedtls_x509_crt *crt,
\r
664 mbedtls_x509_crt_ca_cb_t f_ca_cb,
\r
666 const mbedtls_x509_crt_profile *profile,
\r
667 const char *cn, uint32_t *flags,
\r
668 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
\r
671 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
\r
673 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
\r
675 * \brief Check usage of certificate against keyUsage extension.
\r
677 * \param crt Leaf certificate used.
\r
678 * \param usage Intended usage(s) (eg MBEDTLS_X509_KU_KEY_ENCIPHERMENT
\r
679 * before using the certificate to perform an RSA key
\r
682 * \note Except for decipherOnly and encipherOnly, a bit set in the
\r
683 * usage argument means this bit MUST be set in the
\r
684 * certificate. For decipherOnly and encipherOnly, it means
\r
685 * that bit MAY be set.
\r
687 * \return 0 is these uses of the certificate are allowed,
\r
688 * MBEDTLS_ERR_X509_BAD_INPUT_DATA if the keyUsage extension
\r
689 * is present but does not match the usage argument.
\r
691 * \note You should only call this function on leaf certificates, on
\r
692 * (intermediate) CAs the keyUsage extension is automatically
\r
693 * checked by \c mbedtls_x509_crt_verify().
\r
695 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
\r
696 unsigned int usage );
\r
697 #endif /* MBEDTLS_X509_CHECK_KEY_USAGE) */
\r
699 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
\r
701 * \brief Check usage of certificate against extendedKeyUsage.
\r
703 * \param crt Leaf certificate used.
\r
704 * \param usage_oid Intended usage (eg MBEDTLS_OID_SERVER_AUTH or
\r
705 * MBEDTLS_OID_CLIENT_AUTH).
\r
706 * \param usage_len Length of usage_oid (eg given by MBEDTLS_OID_SIZE()).
\r
708 * \return 0 if this use of the certificate is allowed,
\r
709 * MBEDTLS_ERR_X509_BAD_INPUT_DATA if not.
\r
711 * \note Usually only makes sense on leaf certificates.
\r
713 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
\r
714 const char *usage_oid,
\r
715 size_t usage_len );
\r
716 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
\r
718 #if defined(MBEDTLS_X509_CRL_PARSE_C)
\r
720 * \brief Verify the certificate revocation status
\r
722 * \param crt a certificate to be verified
\r
723 * \param crl the CRL to verify against
\r
725 * \return 1 if the certificate is revoked, 0 otherwise
\r
728 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl );
\r
729 #endif /* MBEDTLS_X509_CRL_PARSE_C */
\r
732 * \brief Initialize a certificate (chain)
\r
734 * \param crt Certificate chain to initialize
\r
736 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt );
\r
739 * \brief Unallocate all certificate data
\r
741 * \param crt Certificate chain to free
\r
743 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt );
\r
745 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
\r
747 * \brief Initialize a restart context
\r
749 void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx );
\r
752 * \brief Free the components of a restart context
\r
754 void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx );
\r
755 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
\r
756 #endif /* MBEDTLS_X509_CRT_PARSE_C */
\r
759 /* \} addtogroup x509_module */
\r
761 #if defined(MBEDTLS_X509_CRT_WRITE_C)
\r
763 * \brief Initialize a CRT writing context
\r
765 * \param ctx CRT context to initialize
\r
767 void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx );
\r
770 * \brief Set the verion for a Certificate
\r
771 * Default: MBEDTLS_X509_CRT_VERSION_3
\r
773 * \param ctx CRT context to use
\r
774 * \param version version to set (MBEDTLS_X509_CRT_VERSION_1, MBEDTLS_X509_CRT_VERSION_2 or
\r
775 * MBEDTLS_X509_CRT_VERSION_3)
\r
777 void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, int version );
\r
780 * \brief Set the serial number for a Certificate.
\r
782 * \param ctx CRT context to use
\r
783 * \param serial serial number to set
\r
785 * \return 0 if successful
\r
787 int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, const mbedtls_mpi *serial );
\r
790 * \brief Set the validity period for a Certificate
\r
791 * Timestamps should be in string format for UTC timezone
\r
792 * i.e. "YYYYMMDDhhmmss"
\r
793 * e.g. "20131231235959" for December 31st 2013
\r
796 * \param ctx CRT context to use
\r
797 * \param not_before not_before timestamp
\r
798 * \param not_after not_after timestamp
\r
800 * \return 0 if timestamp was parsed successfully, or
\r
801 * a specific error code
\r
803 int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, const char *not_before,
\r
804 const char *not_after );
\r
807 * \brief Set the issuer name for a Certificate
\r
808 * Issuer names should contain a comma-separated list
\r
809 * of OID types and values:
\r
810 * e.g. "C=UK,O=ARM,CN=mbed TLS CA"
\r
812 * \param ctx CRT context to use
\r
813 * \param issuer_name issuer name to set
\r
815 * \return 0 if issuer name was parsed successfully, or
\r
816 * a specific error code
\r
818 int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
\r
819 const char *issuer_name );
\r
822 * \brief Set the subject name for a Certificate
\r
823 * Subject names should contain a comma-separated list
\r
824 * of OID types and values:
\r
825 * e.g. "C=UK,O=ARM,CN=mbed TLS Server 1"
\r
827 * \param ctx CRT context to use
\r
828 * \param subject_name subject name to set
\r
830 * \return 0 if subject name was parsed successfully, or
\r
831 * a specific error code
\r
833 int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
\r
834 const char *subject_name );
\r
837 * \brief Set the subject public key for the certificate
\r
839 * \param ctx CRT context to use
\r
840 * \param key public key to include
\r
842 void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key );
\r
845 * \brief Set the issuer key used for signing the certificate
\r
847 * \param ctx CRT context to use
\r
848 * \param key private key to sign with
\r
850 void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key );
\r
853 * \brief Set the MD algorithm to use for the signature
\r
854 * (e.g. MBEDTLS_MD_SHA1)
\r
856 * \param ctx CRT context to use
\r
857 * \param md_alg MD algorithm to use
\r
859 void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, mbedtls_md_type_t md_alg );
\r
862 * \brief Generic function to add to or replace an extension in the
\r
865 * \param ctx CRT context to use
\r
866 * \param oid OID of the extension
\r
867 * \param oid_len length of the OID
\r
868 * \param critical if the extension is critical (per the RFC's definition)
\r
869 * \param val value of the extension OCTET STRING
\r
870 * \param val_len length of the value data
\r
872 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
\r
874 int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
\r
875 const char *oid, size_t oid_len,
\r
877 const unsigned char *val, size_t val_len );
\r
880 * \brief Set the basicConstraints extension for a CRT
\r
882 * \param ctx CRT context to use
\r
883 * \param is_ca is this a CA certificate
\r
884 * \param max_pathlen maximum length of certificate chains below this
\r
885 * certificate (only for CA certificates, -1 is
\r
888 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
\r
890 int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
\r
891 int is_ca, int max_pathlen );
\r
893 #if defined(MBEDTLS_SHA1_C)
\r
895 * \brief Set the subjectKeyIdentifier extension for a CRT
\r
896 * Requires that mbedtls_x509write_crt_set_subject_key() has been
\r
899 * \param ctx CRT context to use
\r
901 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
\r
903 int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx );
\r
906 * \brief Set the authorityKeyIdentifier extension for a CRT
\r
907 * Requires that mbedtls_x509write_crt_set_issuer_key() has been
\r
910 * \param ctx CRT context to use
\r
912 * \return 0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
\r
914 int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx );
\r
915 #endif /* MBEDTLS_SHA1_C */
\r
918 * \brief Set the Key Usage Extension flags
\r
919 * (e.g. MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_KEY_CERT_SIGN)
\r
921 * \param ctx CRT context to use
\r
922 * \param key_usage key usage flags to set
\r
924 * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
\r
926 int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
\r
927 unsigned int key_usage );
\r
930 * \brief Set the Netscape Cert Type flags
\r
931 * (e.g. MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT | MBEDTLS_X509_NS_CERT_TYPE_EMAIL)
\r
933 * \param ctx CRT context to use
\r
934 * \param ns_cert_type Netscape Cert Type flags to set
\r
936 * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
\r
938 int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
\r
939 unsigned char ns_cert_type );
\r
942 * \brief Free the contents of a CRT write context
\r
944 * \param ctx CRT context to free
\r
946 void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx );
\r
949 * \brief Write a built up certificate to a X509 DER structure
\r
950 * Note: data is written at the end of the buffer! Use the
\r
951 * return value to determine where you should start
\r
954 * \param ctx certificate to write away
\r
955 * \param buf buffer to write to
\r
956 * \param size size of the buffer
\r
957 * \param f_rng RNG function (for signature, see note)
\r
958 * \param p_rng RNG parameter
\r
960 * \return length of data written if successful, or a specific
\r
963 * \note f_rng may be NULL if RSA is used for signature and the
\r
964 * signature is made offline (otherwise f_rng is desirable
\r
965 * for countermeasures against timing attacks).
\r
966 * ECDSA signatures always require a non-NULL f_rng.
\r
968 int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
\r
969 int (*f_rng)(void *, unsigned char *, size_t),
\r
972 #if defined(MBEDTLS_PEM_WRITE_C)
\r
974 * \brief Write a built up certificate to a X509 PEM string
\r
976 * \param ctx certificate to write away
\r
977 * \param buf buffer to write to
\r
978 * \param size size of the buffer
\r
979 * \param f_rng RNG function (for signature, see note)
\r
980 * \param p_rng RNG parameter
\r
982 * \return 0 if successful, or a specific error code
\r
984 * \note f_rng may be NULL if RSA is used for signature and the
\r
985 * signature is made offline (otherwise f_rng is desirable
\r
986 * for countermeasures against timing attacks).
\r
987 * ECDSA signatures always require a non-NULL f_rng.
\r
989 int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
\r
990 int (*f_rng)(void *, unsigned char *, size_t),
\r
992 #endif /* MBEDTLS_PEM_WRITE_C */
\r
993 #endif /* MBEDTLS_X509_CRT_WRITE_C */
\r
999 #endif /* mbedtls_x509_crt.h */
\r