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X509(7)                             OpenSSL                            X509(7)



NAME
       x509 - X.509 certificate handling

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/x509.h>

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.

       X509_XXX, d2i_X509_XXX, and i2d_X509_XXX functions handle X.509
       certificates, with some exceptions, shown below.

       X509_CRL_XXX, d2i_X509_CRL_XXX, and i2d_X509_CRL_XXX functions handle
       X.509 CRLs.

       X509_REQ_XXX, d2i_X509_REQ_XXX, and i2d_X509_REQ_XXX functions handle
       PKCS#10 certificate requests.

       X509_NAME_XXX functions handle certificate names.

       X509_ATTRIBUTE_XXX functions handle certificate attributes.

       X509_EXTENSION_XXX functions handle certificate extensions.

SEE ALSO
       X509_NAME_ENTRY_get_object(3), X509_NAME_add_entry_by_txt(3),
       X509_NAME_add_entry_by_NID(3), X509_NAME_print_ex(3), X509_NAME_new(3),
       PEM_X509_INFO_read(3), d2i_X509(3), d2i_X509_ALGOR(3), d2i_X509_CRL(3),
       d2i_X509_NAME(3), d2i_X509_REQ(3), d2i_X509_SIG(3), crypto(7)

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>.



3.0.12                            2023-05-07                           X509(7)