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X509(3)				    OpenSSL			       X509(3)

       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_..., d2i_X509_... and i2d_X509_... handle X.509 certificates, with
       some exceptions,	shown below.

       X509_CRL_..., d2i_X509_CRL_... and i2d_X509_CRL_...  handle X.509 CRLs.

       X509_REQ_..., d2i_X509_REQ_... and i2d_X509_REQ_...  handle PKCS#10
       certificate requests.

       X509_NAME_... handle certificate	names.

       X509_ATTRIBUTE_... handle certificate attributes.

       X509_EXTENSION_... 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

1.1.0f				  2017-05-25			       X509(3)


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