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+=head1 NAME
+x509 - X.509 certificate handling
+=head1 SYNOPSIS
+ #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.
+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
+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