X509(7SSL)                          OpenSSL                         X509(7SSL)

       x509 - X.509 certificate handling

        #include <openssl/x509.h>

       An X.509 certificate is a structured grouping of information about an
       individual, a device, or anything one can imagine.  A 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 attributes), 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.

       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),
       d2i_X509(3), d2i_X509_ALGOR(3), d2i_X509_CRL(3), d2i_X509_NAME(3),
       d2i_X509_REQ(3), d2i_X509_SIG(3), X509v3(3), crypto(7)

       Copyright 2003-2017 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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

1.1.1f                            2023-10-10                        X509(7SSL)
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