mirror of https://github.com/openssl/openssl
74 lines
2.3 KiB
Plaintext
74 lines
2.3 KiB
Plaintext
=pod
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=head1 NAME
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x509 - X.509 certificate handling
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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=head1 DESCRIPTION
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An X.509 certificate is a structured grouping of information about
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an individual, a device, or anything one can imagine. An X.509 CRL
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(certificate revocation list) is a tool to help determine if a
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certificate is still valid. The exact definition of those can be
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found in the X.509 document from ITU-T, or in RFC3280 from PKIX.
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In OpenSSL, the type X509 is used to express such a certificate, and
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the type X509_CRL is used to express a CRL.
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A related structure is a certificate request, defined in PKCS#10 from
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RSA Security, Inc, also reflected in RFC2896. In OpenSSL, the type
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X509_REQ is used to express such a certificate request.
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To handle some complex parts of a certificate, there are the types
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X509_NAME (to express a certificate name), X509_ATTRIBUTE (to express
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a certificate attribute), X509_EXTENSION (to express a certificate
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extension) and a few more.
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Finally, there's the supertype X509_INFO, which can contain a CRL, a
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certificate and a corresponding private key.
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B<X509_>I<XXX>, B<d2i_X509_>I<XXX>, and B<i2d_X509_>I<XXX> functions
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handle X.509 certificates, with some exceptions, shown below.
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B<X509_CRL_>I<XXX>, B<d2i_X509_CRL_>I<XXX>, and B<i2d_X509_CRL_>I<XXX>
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functions handle X.509 CRLs.
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B<X509_REQ_>I<XXX>, B<d2i_X509_REQ_>I<XXX>, and B<i2d_X509_REQ_>I<XXX>
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functions handle PKCS#10 certificate requests.
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B<X509_NAME_>I<XXX> functions handle certificate names.
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B<X509_ATTRIBUTE_>I<XXX> functions handle certificate attributes.
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B<X509_EXTENSION_>I<XXX> functions handle certificate extensions.
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=head1 SEE ALSO
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L<X509_NAME_ENTRY_get_object(3)>,
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L<X509_NAME_add_entry_by_txt(3)>,
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L<X509_NAME_add_entry_by_NID(3)>,
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L<X509_NAME_print_ex(3)>,
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L<X509_NAME_new(3)>,
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L<PEM_X509_INFO_read(3)>,
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L<d2i_X509(3)>,
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L<d2i_X509_ALGOR(3)>,
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L<d2i_X509_CRL(3)>,
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L<d2i_X509_NAME(3)>,
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L<d2i_X509_REQ(3)>,
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L<d2i_X509_SIG(3)>,
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L<crypto(7)>
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=head1 COPYRIGHT
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Copyright 2003-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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