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1.\" $OpenBSD: x509.3,v 1.7 2016/12/15 15:22:17 schwarze Exp $
2.\" OpenSSL a9c85cea Nov 11 09:33:55 2016 +0100
3.\"
4.\" This file was written by Richard Levitte <levitte@openssl.org>
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51.Dd $Mdocdate: December 15 2016 $
52.Dt X509 3
53.Os
54.Sh NAME
55.Nm x509
56.Nd X.509 certificate handling
57.Sh SYNOPSIS
58.In openssl/x509.h
59.Sh DESCRIPTION
60An X.509 certificate is a structured grouping of information about an
61individual, a device, or anything one can imagine.
62An X.509 CRL (certificate revocation list) is a tool to help determine if
63a certificate is still valid.
64The exact definition of those can be found in the X.509 document from
65ITU-T, or in RFC 3280 from PKIX.
66In OpenSSL, the type
67.Vt X509
68is used to express such a certificate, and the type
69.Vt X509_CRL
70is used to express a CRL.
71.Pp
72A related structure is a certificate request, defined in PKCS#10 from
73RSA Security, Inc., also reflected in RFC 2896.
74In OpenSSL, the type
75.Vt X509_REQ
76is used to express such a certificate request.
77.Pp
78Finally, there's the supertype
79.Vt X509_INFO ,
80which can contain a CRL, a certificate, and a corresponding private key.
81.Pp
82The functions
83.Fa X509_* ,
84.Fa d2i_X509_* ,
85and
86.Fa i2d_X509_*
87handle X.509 certificates, with some exceptions shown below.
88.Pp
89.Fa X509_CRL_* ,
90.Fa d2i_X509_CRL_* ,
91and
92.Fa i2d_X509_CRL_*
93handle X.509 CRLs.
94.Pp
95.Fa X509_REQ_* ,
96.Fa d2i_X509_REQ_* ,
97and
98.Fa i2d_X509_REQ_*
99handle PKCS#10 certificate requests.
100.Pp
101The object type
102.Vt X509_NAME
103and the functions documented in
104.Xr X509_NAME_new 3
105and in the manual pages referenced from there handle certificate
106and issuer names.
107.Pp
108.Fa X509_ATTRIBUTE_*
109handle certificate attributes.
110.Pp
111The object type
112.Vt X509_EXTENSION
113and the functions documented in
114.Xr X509_EXTENSION_new 3
115and in the manual pages referenced from there handle certificate
116extensions and certificate revocation list extensions.
117.Sh SEE ALSO
118.Xr crypto 3 ,
119.Xr d2i_X509 3 ,
120.Xr d2i_X509_ALGOR 3 ,
121.Xr d2i_X509_CRL 3 ,
122.Xr d2i_X509_REQ 3 ,
123.Xr d2i_X509_SIG 3 ,
124.Xr X509_EXTENSION_new 3 ,
125.Xr X509_NAME_new 3