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.\" ========================================================================
.\"
.IX Title "X509V3_GET_D2I 3"
.TH X509V3_GET_D2I 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIX509V3_get_ext_d2i()\fR looks for an extension with \s-1OID \s0\fBnid\fR in the extensions
\&\fBx\fR and, if found, decodes it. If \fBidx\fR is \fB\s-1NULL\s0\fR then only one
occurrence of an extension is permissible otherwise the first extension after
index \fB*idx\fR is returned and \fB*idx\fR updated to the location of the extension.
If \fBcrit\fR is not \fB\s-1NULL\s0\fR then \fB*crit\fR is set to a status value: \-2 if the
extension occurs multiple times (this is only returned if \fBidx\fR is \fB\s-1NULL\s0\fR),
\&\-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 \fB\s-1NULL\s0\fR is returned.
.PP
\&\fIX509V3_add1_i2d()\fR adds extension \fBvalue\fR to \s-1STACK \s0\fB*x\fR (allocating a new
\&\s-1STACK\s0 if necessary) using \s-1OID \s0\fBnid\fR and criticality \fBcrit\fR according
to \fBflags\fR.
.PP
\&\fIX509V3_EXT_d2i()\fR attempts to decode the \s-1ASN.1\s0 data contained in extension
\&\fBext\fR and returns a pointer to an extension specific structure or \fB\s-1NULL\s0\fR
if the extension could not be decoded (invalid syntax or not supported).
.PP
\&\fIX509V3_EXT_i2d()\fR encodes the extension specific structure \fBext\fR
with \s-1OID \s0\fBext_nid\fR and criticality \fBcrit\fR.
.PP
\&\fIX509_get_ext_d2i()\fR and \fIX509_add1_ext_i2d()\fR operate on the extensions of
certificate \fBx\fR, they are otherwise identical to \fIX509V3_get_d2i()\fR and
\&\fIX509V3_add_i2d()\fR.
.PP
\&\fIX509_CRL_get_ext_d2i()\fR and \fIX509_CRL_add1_ext_i2d()\fR operate on the extensions
of \s-1CRL \s0\fBcrl\fR, they are otherwise identical to \fIX509V3_get_d2i()\fR and
\&\fIX509V3_add_i2d()\fR.
.PP
\&\fIX509_REVOKED_get_ext_d2i()\fR and \fIX509_REVOKED_add1_ext_i2d()\fR operate on the
extensions of \fBX509_REVOKED\fR structure \fBr\fR (i.e for \s-1CRL\s0 entry extensions),
they are otherwise identical to \fIX509V3_get_d2i()\fR and \fIX509V3_add_i2d()\fR.
.PP
\&\fIX509_get0_extensions()\fR, \fIX509_CRL_get0_extensions()\fR and
\&\fIX509_REVOKED_get0_extensions()\fR return a stack of all the extensions
of a certificate a \s-1CRL\s0 or a \s-1CRL\s0 entry respectively.
.SH "NOTES"
.IX Header "NOTES"
In almost all cases an extension can occur at most once and multiple
occurrences is an error. Therefore, the \fBidx\fR parameter is usually \fB\s-1NULL\s0\fR.
.PP
The \fBflags\fR parameter may be one of the following values.
.PP
\&\fBX509V3_ADD_DEFAULT\fR appends a new extension only if the extension does
not already exist. An error is returned if the extension does already
exist.
.PP
\&\fBX509V3_ADD_APPEND\fR appends a new extension, ignoring whether the extension
already exists.
.PP
\&\fBX509V3_ADD_REPLACE\fR replaces an extension if it exists otherwise appends
a new extension.
.PP
\&\fBX509V3_ADD_REPLACE_EXISTING\fR replaces an existing extension if it exists
otherwise returns an error.
.PP
\&\fBX509V3_ADD_KEEP_EXISTING\fR appends a new extension only if the extension does
not already exist. An error \fBis not\fR returned if the extension does already
exist.
.PP
\&\fBX509V3_ADD_DELETE\fR extension \fBnid\fR is deleted: no new extension is added.
.PP
If \fBX509V3_ADD_SILENT\fR is ored with \fBflags\fR: any error returned will not
be added to the error queue.
.PP
The function \fIX509V3_get_d2i()\fR will return \fB\s-1NULL\s0\fR 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 \fB*crit\fR.
.SH "SUPPORTED EXTENSIONS"
.IX Header "SUPPORTED EXTENSIONS"
The following sections contain a list of all supported extensions
including their name and \s-1NID.\s0
.SS "\s-1PKIX\s0 Certificate Extensions"
.IX Subsection "PKIX Certificate Extensions"
The following certificate extensions are defined in \s-1PKIX\s0 standards such as
\&\s-1RFC5280.\s0
.PP
.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
.SS "Netscape Certificate Extensions"
.IX Subsection "Netscape Certificate Extensions"
The following are (largely obsolete) Netscape certificate extensions.
.PP
.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
.SS "Miscellaneous Certificate Extensions"
.IX Subsection "Miscellaneous Certificate Extensions"
.Vb 2
\& Strong Extranet ID NID_sxnet
\& Proxy Certificate Information NID_proxyCertInfo
.Ve
.SS "\s-1PKIX CRL\s0 Extensions"
.IX Subsection "PKIX CRL Extensions"
The following are \s-1CRL\s0 extensions from \s-1PKIX\s0 standards such as \s-1RFC5280.\s0
.PP
.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
.PP
The following are \s-1CRL\s0 entry extensions from \s-1PKIX\s0 standards such as \s-1RFC5280.\s0
.PP
.Vb 2
\& CRL Reason Code NID_crl_reason
\& Certificate Issuer NID_certificate_issuer
.Ve
.SS "\s-1OCSP\s0 Extensions"
.IX Subsection "OCSP Extensions"
.Vb 7
\& 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
.Ve
.SS "Certificate Transparency Extensions"
.IX Subsection "Certificate Transparency Extensions"
The following extensions are used by certificate transparency, \s-1RFC6962\s0
.PP
.Vb 2
\& CT Precertificate SCTs NID_ct_precert_scts
\& CT Certificate SCTs NID_ct_cert_scts
.Ve
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIX509V3_EXT_d2i()\fR and *\fIX509V3_get_d2i()\fR return a pointer to an extension
specific structure of \fB\s-1NULL\s0\fR if an error occurs.
.PP
\&\fIX509V3_EXT_i2d()\fR returns a pointer to an \fBX509_EXTENSION\fR structure
or \fB\s-1NULL\s0\fR if an error occurs.
.PP
\&\fIX509V3_add1_i2d()\fR 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.
.PP
\&\fIX509_get0_extensions()\fR, \fIX509_CRL_get0_extensions()\fR and
\&\fIX509_REVOKED_get0_extensions()\fR return a stack of extensions. They return
\&\s-1NULL\s0 if no extensions are present.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fId2i_X509\fR\|(3),
\&\fIERR_get_error\fR\|(3),
\&\fIX509_CRL_get0_by_serial\fR\|(3),
\&\fIX509_get0_signature\fR\|(3),
\&\fIX509_get_ext_d2i\fR\|(3),
\&\fIX509_get_extension_flags\fR\|(3),
\&\fIX509_get_pubkey\fR\|(3),
\&\fIX509_get_subject_name\fR\|(3),
\&\fIX509_get_version\fR\|(3),
\&\fIX509_NAME_add_entry_by_txt\fR\|(3),
\&\fIX509_NAME_ENTRY_get_object\fR\|(3),
\&\fIX509_NAME_get_index_by_NID\fR\|(3),
\&\fIX509_NAME_print_ex\fR\|(3),
\&\fIX509_new\fR\|(3),
\&\fIX509_sign\fR\|(3),
\&\fIX509_verify_cert\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
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