5 X509V3_get_d2i, X509V3_add1_i2d, X509V3_EXT_d2i, X509V3_EXT_i2d,
6 X509_get_ext_d2i, X509_add1_ext_i2d, X509_CRL_get_ext_d2i,
7 X509_CRL_add1_ext_i2d, X509_REVOKED_get_ext_d2i,
8 X509_REVOKED_add1_ext_i2d - X509 extension decode and encode functions
12 #include <openssl/x509v3.h>
14 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
16 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
17 int crit, unsigned long flags);
19 void *X509V3_EXT_d2i(X509_EXTENSION *ext);
20 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext);
22 void *X509_get_ext_d2i(X509 *x, int nid, int *crit, int *idx);
23 int X509_add1_ext_i2d(X509 *x, int nid, void *value, int crit,
26 void *X509_CRL_get_ext_d2i(X509_CRL *crl, int nid, int *crit, int *idx);
27 int X509_CRL_add1_ext_i2d(X509_CRL *crl, int nid, void *value, int crit,
30 void *X509_REVOKED_get_ext_d2i(X509_REVOKED *r, int nid, int *crit, int *idx);
31 int X509_REVOKED_add1_ext_i2d(X509_REVOKED *r, int nid, void *value, int crit,
34 STACK_OF(X509_EXTENSION) *X509_get0_extensions(const X509 *x);
35 STACK_OF(X509_EXTENSION) *X509_CRL_get0_extensions(X509_CRL *crl);
36 STACK_OF(X509_EXTENSION) *X509_REVOKED_get0_extensions(X509_REVOKED *r);
40 X509V3_get_ext_d2i() looks for an extension with OID B<nid> in the extensions
41 B<x> and, if found, decodes it. If B<idx> is B<NULL> then only one
42 occurrence of an extension is permissible otherwise the first extension after
43 index B<*idx> is returned and B<*idx> updated to the location of the extension.
44 If B<crit> is not B<NULL> then B<*crit> is set to a status value: -2 if the
45 extension occurs multiple times (this is only returned if B<idx> is B<NULL>),
46 -1 if the extension could not be found, 0 if the extension is found and is
47 not critical and 1 if critical. A pointer to an extension specific structure
48 or B<NULL> is returned.
50 X509V3_add1_i2d() adds extension B<value> to STACK B<*x> (allocating a new
51 STACK if necessary) using OID B<nid> and criticality B<crit> according
54 X509V3_EXT_d2i() attempts to decode the ASN.1 data contained in extension
55 B<ext> and returns a pointer to an extension specific structure or B<NULL>
56 if the extension could not be decoded (invalid syntax or not supported).
58 X509V3_EXT_i2d() encodes the extension specific structure B<ext>
59 with OID B<ext_nid> and criticality B<crit>.
61 X509_get_ext_d2i() and X509_add1_ext_i2d() operate on the extensions of
62 certificate B<x>, they are otherwise identical to X509V3_get_d2i() and
65 X509_CRL_get_ext_d2i() and X509_CRL_add1_ext_i2d() operate on the extensions
66 of CRL B<crl>, they are otherwise identical to X509V3_get_d2i() and
69 X509_REVOKED_get_ext_d2i() and X509_REVOKED_add1_ext_i2d() operate on the
70 extensions of B<X509_REVOKED> structure B<r> (i.e for CRL entry extensions),
71 they are otherwise identical to X509V3_get_d2i() and X509V3_add_i2d().
73 X509_get0_extensions(), X509_CRL_get0_extensions() and
74 X509_REVOKED_get0_extensions() return a stack of all the extensions
75 of a certificate a CRL or a CRL entry respectively.
79 In almost all cases an extension can occur at most once and multiple
80 occurrences is an error. Therefore the B<idx> parameter is usually B<NULL>.
82 The B<flags> parameter may be one of the following values.
84 B<X509V3_ADD_DEFAULT> appends a new extension only if the extension does
85 not already exist. An error is returned if the extension does already
88 B<X509V3_ADD_APPEND> appends a new extension, ignoring whether the extension
91 B<X509V3_ADD_REPLACE> replaces an extension if it exists otherwise apppends
94 B<X509V3_ADD_REPLACE_EXISTING> replaces an existing extension if it exists
95 otherwise returns an error.
97 B<X509V3_ADD_KEEP_EXISTING> appends a new extension only if the extension does
98 not already exist. An error B<is not> returned if the extension does already
101 B<X509V3_ADD_DELETE> extension B<nid> is deleted: no new extenion is added.
103 If B<X509V3_ADD_SILENT> is ored with B<flags>: any error returned will not
104 be added to the error queue.
106 The function X509V3_get_d2i() will return B<NULL> if the extension is not
107 found, occurs multiple times or cannot be decoded. It is possible to
108 determine the precise reason by checking the value of B<*crit>.
110 =head1 SUPPORTED EXTENSIONS
112 The following sections contain a list of all supported extensions
113 including their name and NID.
115 =head2 PKIX CERTIFICATE EXTENSIONS
117 The following certificate extensions are defined in PKIX standards such as
120 Basic Constraints NID_basic_constraints
121 Key Usage NID_key_usage
122 Extended Key Usage NID_ext_key_usage
124 Subject Key Identifier NID_subject_key_identifier
125 Authority Key Identifier NID_authority_key_identifier
127 Private Key Usage Period NID_private_key_usage_period
129 Subject Alternative Name NID_subject_alt_name
130 Issuer Alternative Name NID_issuer_alt_name
132 Authority Information Access NID_info_access
133 Subject Information Access NID_sinfo_access
135 Name Constraints NID_name_constraints
137 Certificate Policies NID_certificate_policies
138 Policy Mappings NID_policy_mappings
139 Policy Constraints NID_policy_constraints
140 Inhibit Any Policy NID_inhibit_any_policy
142 TLS Feature NID_tlsfeature
144 =head2 NETSCAPE CERTIFICATE EXTENSIONS
146 The following are (largely obsolete) Netscape certificate extensions.
148 Netscape Cert Type NID_netscape_cert_type
149 Netscape Base Url NID_netscape_base_url
150 Netscape Revocation Url NID_netscape_revocation_url
151 Netscape CA Revocation Url NID_netscape_ca_revocation_url
152 Netscape Renewal Url NID_netscape_renewal_url
153 Netscape CA Policy Url NID_netscape_ca_policy_url
154 Netscape SSL Server Name NID_netscape_ssl_server_name
155 Netscape Comment NID_netscape_comment
157 =head2 MISCELLANEOUS CERTIFICATE EXTENSIONS
159 Strong Extranet ID NID_sxnet
160 Proxy Certificate Information NID_proxyCertInfo
162 =head2 PKIX CRL EXTENSIONS
164 The following are CRL extensions from PKIX standards such as RFC5280.
166 CRL Number NID_crl_number
167 CRL Distribution Points NID_crl_distribution_points
168 Delta CRL Indicator NID_delta_crl
169 Freshest CRL NID_freshest_crl
170 Invalidity Date NID_invalidity_date
171 Issuing Distribution Point NID_issuing_distribution_point
173 The following are CRL entry extensions from PKIX standards such as RFC5280.
175 CRL Reason Code NID_crl_reason
176 Certificate Issuer NID_certificate_issuer
178 =head2 OCSP EXTENSIONS
180 OCSP Nonce NID_id_pkix_OCSP_Nonce
181 OCSP CRL ID NID_id_pkix_OCSP_CrlID
182 Acceptable OCSP Responses NID_id_pkix_OCSP_acceptableResponses
183 OCSP No Check NID_id_pkix_OCSP_noCheck
184 OCSP Archive Cutoff NID_id_pkix_OCSP_archiveCutoff
185 OCSP Service Locator NID_id_pkix_OCSP_serviceLocator
186 Hold Instruction Code NID_hold_instruction_code
188 =head2 CERTIFICATE TRANSPARENCY EXTENSIONS
190 The following extensions are used by certificate transparency, RFC6962
192 CT Precertificate SCTs NID_ct_precert_scts
193 CT Certificate SCTs NID_ct_cert_scts
197 X509V3_EXT_d2i() and *X509V3_get_d2i() return a pointer to an extension
198 specific structure of B<NULL> if an error occurs.
200 X509V3_EXT_i2d() returns a pointer to an B<X509_EXTENSION> structure
201 or B<NULL> if an error occurs.
203 X509V3_add1_i2d() returns 1 if the operation is successful and 0 if it
204 fails due to a non-fatal error (extension not found, already exists,
205 cannot be encoded) or -1 due to a fatal error such as a memory allocation
208 X509_get0_extensions(), X509_CRL_get0_extensions() and
209 X509_REVOKED_get0_extensions() return a stack of extensions. They can return
210 NULL if no extensions are present.
216 L<X509_CRL_get0_by_serial(3)>,
217 L<X509_get0_signature(3)>,
218 L<X509_get_ext_d2i(3)>,
219 L<X509_get_extension_flags(3)>,
220 L<X509_get_pubkey(3)>,
221 L<X509_get_subject_name(3)>,
222 L<X509_get_version(3)>,
223 L<X509_NAME_add_entry_by_txt(3)>,
224 L<X509_NAME_ENTRY_get_object(3)>,
225 L<X509_NAME_get_index_by_NID(3)>,
226 L<X509_NAME_print_ex(3)>,
229 L<X509_verify_cert(3)>