| =pod |
| |
| =head1 NAME |
| |
| x509 - X.509 certificate handling |
| |
| =head1 SYNOPSIS |
| |
| #include <openssl/x509.h> |
| |
| =head1 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's the supertype X509_INFO, which can contain a CRL, a |
| certificate and a corresponding private key. |
| |
| B<X509_>I<XXX>, B<d2i_X509_>I<XXX>, and B<i2d_X509_>I<XXX> functions |
| handle X.509 certificates, with some exceptions, shown below. |
| |
| B<X509_CRL_>I<XXX>, B<d2i_X509_CRL_>I<XXX>, and B<i2d_X509_CRL_>I<XXX> |
| functions handle X.509 CRLs. |
| |
| B<X509_REQ_>I<XXX>, B<d2i_X509_REQ_>I<XXX>, and B<i2d_X509_REQ_>I<XXX> |
| functions handle PKCS#10 certificate requests. |
| |
| B<X509_NAME_>I<XXX> functions handle certificate names. |
| |
| B<X509_ATTRIBUTE_>I<XXX> functions handle certificate attributes. |
| |
| B<X509_EXTENSION_>I<XXX> functions handle certificate extensions. |
| |
| =head1 SEE ALSO |
| |
| L<X509_NAME_ENTRY_get_object(3)>, |
| L<X509_NAME_add_entry_by_txt(3)>, |
| L<X509_NAME_add_entry_by_NID(3)>, |
| L<X509_NAME_print_ex(3)>, |
| L<X509_NAME_new(3)>, |
| L<PEM_X509_INFO_read(3)>, |
| L<d2i_X509(3)>, |
| L<d2i_X509_ALGOR(3)>, |
| L<d2i_X509_CRL(3)>, |
| L<d2i_X509_NAME(3)>, |
| L<d2i_X509_REQ(3)>, |
| L<d2i_X509_SIG(3)>, |
| L<crypto(7)> |
| |
| =head1 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 |
| L<https://www.openssl.org/source/license.html>. |
| |
| =cut |
