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Title "X509V3_get_d2i 3"
way too many mistakes in technical documents.
.nh
\fBX509V3_add1_i2d() adds extension value to STACK *x (allocating a new STACK if necessary) using OID nid and criticality crit according to flags.
\fBX509V3_EXT_d2i() attempts to decode the ASN.1 data contained in extension \fIext and returns a pointer to an extension specific structure or NULL if the extension could not be decoded (invalid syntax or not supported).
\fBX509V3_EXT_i2d() encodes the extension specific structure ext_struc with OID ext_nid and criticality crit.
\fBX509_get_ext_d2i() and X509_add1_ext_i2d() operate on the extensions of certificate x. They are otherwise identical to X509V3_get_d2i() and \fBX509V3_add1_i2d().
\fBX509_CRL_get_ext_d2i() and X509_CRL_add1_ext_i2d() operate on the extensions of CRL crl. They are otherwise identical to X509V3_get_d2i() and \fBX509V3_add1_i2d().
\fBX509_REVOKED_get_ext_d2i() and X509_REVOKED_add1_ext_i2d() operate on the extensions of X509_REVOKED structure r (i.e for CRL entry extensions). They are otherwise identical to X509V3_get_d2i() and X509V3_add1_i2d().
\fBX509_get0_extensions(), X509_CRL_get0_extensions() and \fBX509_REVOKED_get0_extensions() return a STACK of all the extensions of a certificate, a CRL or a CRL entry respectively.
The flags parameter may be one of the following values.
\fBX509V3_ADD_DEFAULT appends a new extension only if the extension does not exist. An error is returned if the extension exists.
\fBX509V3_ADD_APPEND appends a new extension, ignoring whether the extension exists.
\fBX509V3_ADD_REPLACE replaces an existing extension. If the extension does not exist, appends a new extension.
\fBX509V3_ADD_REPLACE_EXISTING replaces an existing extension. If the extension does not exist, returns an error.
\fBX509V3_ADD_KEEP_EXISTING appends a new extension only if the extension does not exist. An error is not returned if the extension exists.
\fBX509V3_ADD_DELETE deletes and frees an existing extension. If the extension does not exist, returns an error. No new extension is added.
If X509V3_ADD_SILENT is bitwise ORed with flags: any error returned will not be added to the error queue.
The function X509V3_get_d2i() and its variants will return NULL if the extension is not found, occurs multiple times or cannot be decoded. It is possible to determine the precise reason by checking the value of *crit. The returned pointer must be explicitly freed.
The function X509V3_add1_i2d() and its variants allocate X509_EXTENSION objects on STACK *x depending on flags. The X509_EXTENSION objects must be explicitly freed using X509_EXTENSION_free().
.Vb 3 Basic Constraints NID_basic_constraints Key Usage NID_key_usage Extended Key Usage NID_ext_key_usage \& Subject Key Identifier NID_subject_key_identifier Authority Key Identifier NID_authority_key_identifier \& Private Key Usage Period NID_private_key_usage_period \& Subject Alternative Name NID_subject_alt_name Issuer Alternative Name NID_issuer_alt_name \& Authority Information Access NID_info_access Subject Information Access NID_sinfo_access \& Name Constraints NID_name_constraints \& Certificate Policies NID_certificate_policies Policy Mappings NID_policy_mappings Policy Constraints NID_policy_constraints Inhibit Any Policy NID_inhibit_any_policy \& TLS Feature NID_tlsfeature .Ve
.Vb 8 Netscape Cert Type NID_netscape_cert_type Netscape Base Url NID_netscape_base_url Netscape Revocation Url NID_netscape_revocation_url Netscape CA Revocation Url NID_netscape_ca_revocation_url Netscape Renewal Url NID_netscape_renewal_url Netscape CA Policy Url NID_netscape_ca_policy_url Netscape SSL Server Name NID_netscape_ssl_server_name Netscape Comment NID_netscape_comment .Ve
.Vb 6 CRL Number NID_crl_number CRL Distribution Points NID_crl_distribution_points Delta CRL Indicator NID_delta_crl Freshest CRL NID_freshest_crl Invalidity Date NID_invalidity_date Issuing Distribution Point NID_issuing_distribution_point .Ve
The following are CRL entry extensions from PKIX standards such as RFC5280.
.Vb 2 CRL Reason Code NID_crl_reason Certificate Issuer NID_certificate_issuer .Ve
.Vb 2 CT Precertificate SCTs NID_ct_precert_scts CT Certificate SCTs NID_ct_cert_scts .Ve
\fBX509V3_add1_i2d() and its variants return 1 if the operation is successful and 0 if it fails due to a non-fatal error (extension not found, already exists, cannot be encoded) or -1 due to a fatal error such as a memory allocation failure.
\fBX509V3_EXT_i2d() returns a pointer to an X509_EXTENSION structure or NULL if an error occurs.
\fBX509_get0_extensions(), X509_CRL_get0_extensions() and \fBX509_REVOKED_get0_extensions() return a stack of extensions. They return NULL if no extensions are present.
Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.
Indexes created Wed Apr 29 00:23:26 UTC 2026