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+.\" ========================================================================
+.\"
+.IX Title "X509 7"
+.TH X509 7 "2019-09-10" "1.1.1d" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+x509 \- X.509 certificate handling
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/x509.h>
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+An X.509 certificate is a structured grouping of information about
+an individual, a device, or anything one can imagine.  A X.509 \s-1CRL\s0
+(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 \s-1RFC3280\s0 from \s-1PKIX.\s0
+In OpenSSL, the type X509 is used to express such a certificate, and
+the type X509_CRL is used to express a \s-1CRL.\s0
+.PP
+A related structure is a certificate request, defined in PKCS#10 from
+\&\s-1RSA\s0 Security, Inc, also reflected in \s-1RFC2896.\s0  In OpenSSL, the type
+X509_REQ is used to express such a certificate request.
+.PP
+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.
+.PP
+Finally, there's the supertype X509_INFO, which can contain a \s-1CRL,\s0 a
+certificate and a corresponding private key.
+.PP
+\&\fBX509_\fR\fI\s-1XXX\s0\fR, \fBd2i_X509_\fR\fI\s-1XXX\s0\fR, and \fBi2d_X509_\fR\fI\s-1XXX\s0\fR functions
+handle X.509 certificates, with some exceptions, shown below.
+.PP
+\&\fBX509_CRL_\fR\fI\s-1XXX\s0\fR, \fBd2i_X509_CRL_\fR\fI\s-1XXX\s0\fR, and \fBi2d_X509_CRL_\fR\fI\s-1XXX\s0\fR
+functions handle X.509 CRLs.
+.PP
+\&\fBX509_REQ_\fR\fI\s-1XXX\s0\fR, \fBd2i_X509_REQ_\fR\fI\s-1XXX\s0\fR, and \fBi2d_X509_REQ_\fR\fI\s-1XXX\s0\fR
+functions handle PKCS#10 certificate requests.
+.PP
+\&\fBX509_NAME_\fR\fI\s-1XXX\s0\fR functions handle certificate names.
+.PP
+\&\fBX509_ATTRIBUTE_\fR\fI\s-1XXX\s0\fR functions handle certificate attributes.
+.PP
+\&\fBX509_EXTENSION_\fR\fI\s-1XXX\s0\fR functions handle certificate extensions.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBX509_NAME_ENTRY_get_object\fR\|(3),
+\&\fBX509_NAME_add_entry_by_txt\fR\|(3),
+\&\fBX509_NAME_add_entry_by_NID\fR\|(3),
+\&\fBX509_NAME_print_ex\fR\|(3),
+\&\fBX509_NAME_new\fR\|(3),
+\&\fBd2i_X509\fR\|(3),
+\&\fBd2i_X509_ALGOR\fR\|(3),
+\&\fBd2i_X509_CRL\fR\|(3),
+\&\fBd2i_X509_NAME\fR\|(3),
+\&\fBd2i_X509_REQ\fR\|(3),
+\&\fBd2i_X509_SIG\fR\|(3),
+\&\fBX509v3\fR\|(3),
+\&\fBcrypto\fR\|(7)
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2003\-2017 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at
+<https://www.openssl.org/source/license.html>.