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X509V3_GET_D2I(3)                   OpenSSL                  X509V3_GET_D2I(3)
NAME
       X509_get0_extensions, X509_CRL_get0_extensions,
       X509_REVOKED_get0_extensions, X509V3_get_d2i, X509V3_add1_i2d,
       X509V3_EXT_d2i, X509V3_EXT_i2d, X509_get_ext_d2i, X509_add1_ext_i2d,
       X509_CRL_get_ext_d2i, X509_CRL_add1_ext_i2d, X509_REVOKED_get_ext_d2i,
       X509_REVOKED_add1_ext_i2d - X509 extension decode and encode functions
SYNOPSIS
        #include <openssl/x509v3.h>
        void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
                             int *idx);
        int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
                            int crit, unsigned long flags);
        void *X509V3_EXT_d2i(X509_EXTENSION *ext);
        X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext);
        void *X509_get_ext_d2i(const X509 *x, int nid, int *crit, int *idx);
        int X509_add1_ext_i2d(X509 *x, int nid, void *value, int crit,
                              unsigned long flags);
        void *X509_CRL_get_ext_d2i(const X509_CRL *crl, int nid, int *crit, int *idx);
        int X509_CRL_add1_ext_i2d(X509_CRL *crl, int nid, void *value, int crit,
                                  unsigned long flags);
        void *X509_REVOKED_get_ext_d2i(const X509_REVOKED *r, int nid, int *crit, int *idx);
        int X509_REVOKED_add1_ext_i2d(X509_REVOKED *r, int nid, void *value, int crit,
                                      unsigned long flags);
        const STACK_OF(X509_EXTENSION) *X509_get0_extensions(const X509 *x);
        const STACK_OF(X509_EXTENSION) *X509_CRL_get0_extensions(const X509_CRL *crl);
        const STACK_OF(X509_EXTENSION) *X509_REVOKED_get0_extensions(const X509_REVOKED *r);
DESCRIPTION
       X509V3_get_ext_d2i() looks for an extension with OID nid in the
       extensions x and, if found, decodes it. If idx is NULL then only one
       occurrence of an extension is permissible otherwise the first extension
       after index *idx is returned and *idx updated to the location of the
       extension.  If crit is not NULL then *crit is set to a status value: -2
       if the extension occurs multiple times (this is only returned if idx is
       NULL), -1 if the extension could not be found, 0 if the extension is
       found and is not critical and 1 if critical. A pointer to an extension
       specific structure or NULL is returned.
       X509V3_add1_i2d() adds extension value to STACK *x (allocating a new
       STACK if necessary) using OID nid and criticality crit according to
       flags.
       X509V3_EXT_d2i() attempts to decode the ASN.1 data contained in
       extension ext and returns a pointer to an extension specific structure
       or NULL if the extension could not be decoded (invalid syntax or not
       supported).
       X509V3_EXT_i2d() encodes the extension specific structure ext with OID
       ext_nid and criticality crit.
       X509_get_ext_d2i() and X509_add1_ext_i2d() operate on the extensions of
       certificate x, they are otherwise identical to X509V3_get_d2i() and
       X509V3_add_i2d().
       X509_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 X509V3_add_i2d().
       X509_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_add_i2d().
       X509_get0_extensions(), X509_CRL_get0_extensions() and
       X509_REVOKED_get0_extensions() return a stack of all the extensions of
       a certificate a CRL or a CRL entry respectively.
NOTES
       In almost all cases an extension can occur at most once and multiple
       occurrences is an error. Therefore, the idx parameter is usually NULL.
       The flags parameter may be one of the following values.
       X509V3_ADD_DEFAULT appends a new extension only if the extension does
       not already exist. An error is returned if the extension does already
       exist.
       X509V3_ADD_APPEND appends a new extension, ignoring whether the
       extension already exists.
       X509V3_ADD_REPLACE replaces an extension if it exists otherwise appends
       a new extension.
       X509V3_ADD_REPLACE_EXISTING replaces an existing extension if it exists
       otherwise returns an error.
       X509V3_ADD_KEEP_EXISTING appends a new extension only if the extension
       does not already exist. An error is not returned if the extension does
       already exist.
       X509V3_ADD_DELETE extension nid is deleted: no new extension is added.
       If X509V3_ADD_SILENT is ored with flags: any error returned will not be
       added to the error queue.
       The function X509V3_get_d2i() 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.
SUPPORTED EXTENSIONS
       The following sections contain a list of all supported extensions
       including their name and NID.
   PKIX Certificate Extensions
       The following certificate extensions are defined in PKIX standards such
       as RFC5280.
        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
   Netscape Certificate Extensions
       The following are (largely obsolete) Netscape certificate extensions.
        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
   Miscellaneous Certificate Extensions
        Strong Extranet ID                 NID_sxnet
        Proxy Certificate Information      NID_proxyCertInfo
   PKIX CRL Extensions
       The following are CRL extensions from PKIX standards such as RFC5280.
        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
       The following are CRL entry extensions from PKIX standards such as
       RFC5280.
        CRL Reason Code                    NID_crl_reason
        Certificate Issuer                 NID_certificate_issuer
   OCSP Extensions
        OCSP Nonce                         NID_id_pkix_OCSP_Nonce
        OCSP CRL ID                        NID_id_pkix_OCSP_CrlID
        Acceptable OCSP Responses          NID_id_pkix_OCSP_acceptableResponses
        OCSP No Check                      NID_id_pkix_OCSP_noCheck
        OCSP Archive Cutoff                NID_id_pkix_OCSP_archiveCutoff
        OCSP Service Locator               NID_id_pkix_OCSP_serviceLocator
        Hold Instruction Code              NID_hold_instruction_code
   Certificate Transparency Extensions
       The following extensions are used by certificate transparency, RFC6962
        CT Precertificate SCTs             NID_ct_precert_scts
        CT Certificate SCTs                NID_ct_cert_scts
RETURN VALUES
       X509V3_EXT_d2i() and *X509V3_get_d2i() return a pointer to an extension
       specific structure of NULL if an error occurs.
       X509V3_EXT_i2d() returns a pointer to an X509_EXTENSION structure or
       NULL if an error occurs.
       X509V3_add1_i2d() returns 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.
       X509_get0_extensions(), X509_CRL_get0_extensions() and
       X509_REVOKED_get0_extensions() return a stack of extensions. They
       return NULL if no extensions are present.
SEE ALSO
       d2i_X509(3), ERR_get_error(3), X509_CRL_get0_by_serial(3),
       X509_get0_signature(3), X509_get_ext_d2i(3),
       X509_get_extension_flags(3), X509_get_pubkey(3),
       X509_get_subject_name(3), X509_get_version(3),
       X509_NAME_add_entry_by_txt(3), X509_NAME_ENTRY_get_object(3),
       X509_NAME_get_index_by_NID(3), X509_NAME_print_ex(3), X509_new(3),
       X509_sign(3), X509_verify_cert(3)
COPYRIGHT
       Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
       Licensed under the OpenSSL license (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>;.
1.1.1k                            2021-03-25                 X509V3_GET_D2I(3)