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.\" ========================================================================
.\"
.IX Title "x509 3"
.TH x509 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.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"
A 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...\fR, \fBd2i_X509_\fR\fI...\fR and \fBi2d_X509_\fR\fI...\fR handle X.509
certificates, with some exceptions, shown below.
.PP
\&\fBX509_CRL_\fR\fI...\fR, \fBd2i_X509_CRL_\fR\fI...\fR and \fBi2d_X509_CRL_\fR\fI...\fR
handle X.509 CRLs.
.PP
\&\fBX509_REQ_\fR\fI...\fR, \fBd2i_X509_REQ_\fR\fI...\fR and \fBi2d_X509_REQ_\fR\fI...\fR
handle PKCS#10 certificate requests.
.PP
\&\fBX509_NAME_\fR\fI...\fR handle certificate names.
.PP
\&\fBX509_ATTRIBUTE_\fR\fI...\fR handle certificate attributes.
.PP
\&\fBX509_EXTENSION_\fR\fI...\fR handle certificate extensions.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIX509_NAME_ENTRY_get_object\fR\|(3),
\&\fIX509_NAME_add_entry_by_txt\fR\|(3),
\&\fIX509_NAME_add_entry_by_NID\fR\|(3),
\&\fIX509_NAME_print_ex\fR\|(3),
\&\fIX509_NAME_new\fR\|(3),
\&\fId2i_X509\fR\|(3),
\&\fId2i_X509_ALGOR\fR\|(3),
\&\fId2i_X509_CRL\fR\|(3),
\&\fId2i_X509_NAME\fR\|(3),
\&\fId2i_X509_REQ\fR\|(3),
\&\fId2i_X509_SIG\fR\|(3),
\&\fIcrypto\fR\|(3),
\&\fIx509v3\fR\|(3)

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