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 Title "X509 7" 
 X509 7 2026-04-07 3.5.6 OpenSSL
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.nh

 NAME
x509 - X.509 certificate handling

 SYNOPSIS
 Header "SYNOPSIS" .Vb 1
 #include <openssl/x509.h>
.Ve

 DESCRIPTION
 Header "DESCRIPTION" An X.509 certificate is a structured grouping of information about
an individual, a device, or anything one can imagine. An X.509 CRL
(certificate revocation list) is a tool to help determine if a
certificate is still valid. The exact definition of those can be
found in the X.509 document from ITU-T, or in RFC3280 from PKIX.
In OpenSSL, the type X509 is used to express such a certificate, and
the type X509_CRL is used to express a CRL.


A related structure is a certificate request, defined in PKCS#10 from
RSA Security, Inc, also reflected in RFC2896. In OpenSSL, the type
X509_REQ is used to express such a certificate request.


To handle some complex parts of a certificate, there are the types
X509_NAME (to express a certificate name), X509_ATTRIBUTE (to express
a certificate attribute), X509_EXTENSION (to express a certificate
extension) and a few more.


Finally, there\*(Aqs the supertype X509_INFO, which can contain a CRL, a
certificate and a corresponding private key.


\fBX509_XXX, d2i_X509_XXX, and i2d_X509_XXX functions
handle X.509 certificates, with some exceptions, shown below.


\fBX509_CRL_XXX, d2i_X509_CRL_XXX, and i2d_X509_CRL_XXX
functions handle X.509 CRLs.


\fBX509_REQ_XXX, d2i_X509_REQ_XXX, and i2d_X509_REQ_XXX
functions handle PKCS#10 certificate requests.


\fBX509_NAME_XXX functions handle certificate names.


\fBX509_ATTRIBUTE_XXX functions handle certificate attributes.


\fBX509_EXTENSION_XXX functions handle certificate extensions.

 "SEE ALSO"
 Header "SEE ALSO" \fBX509_NAME_ENTRY_get_object\|(3),
\fBX509_NAME_add_entry_by_txt\|(3),
\fBX509_NAME_add_entry_by_NID\|(3),
\fBX509_NAME_print_ex\|(3),
\fBX509_NAME_new\|(3),
\fBPEM_X509_INFO_read\|(3),
\fBd2i_X509\|(3),
\fBd2i_X509_ALGOR\|(3),
\fBd2i_X509_CRL\|(3),
\fBd2i_X509_NAME\|(3),
\fBd2i_X509_REQ\|(3),
\fBd2i_X509_SIG\|(3),
\fBcrypto\|(7)

 COPYRIGHT
 Header "COPYRIGHT" Copyright 2003-2021 The OpenSSL Project Authors. All Rights Reserved.


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>.