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135 .TH x509 3 "2010-02-27" "0.9.8m" "OpenSSL"
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141 x509 \- X.509 certificate handling
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/x509.h>
148 .IX Header "DESCRIPTION"
149 A X.509 certificate is a structured grouping of information about
150 an individual, a device, or anything one can imagine. A X.509 \s-1CRL\s0
151 (certificate revocation list) is a tool to help determine if a
152 certificate is still valid. The exact definition of those can be
153 found in the X.509 document from ITU-T, or in \s-1RFC3280\s0 from \s-1PKIX\s0.
154 In OpenSSL, the type X509 is used to express such a certificate, and
155 the type X509_CRL is used to express a \s-1CRL\s0.
157 A related structure is a certificate request, defined in PKCS#10 from
158 \&\s-1RSA\s0 Security, Inc, also reflected in \s-1RFC2896\s0. In OpenSSL, the type
159 X509_REQ is used to express such a certificate request.
161 To handle some complex parts of a certificate, there are the types
162 X509_NAME (to express a certificate name), X509_ATTRIBUTE (to express
163 a certificate attributes), X509_EXTENSION (to express a certificate
164 extension) and a few more.
166 Finally, there's the supertype X509_INFO, which can contain a \s-1CRL\s0, a
167 certificate and a corresponding private key.
169 \&\fBX509_\fR\fI...\fR, \fBd2i_X509_\fR\fI...\fR and \fBi2d_X509_\fR\fI...\fR handle X.509
170 certificates, with some exceptions, shown below.
172 \&\fBX509_CRL_\fR\fI...\fR, \fBd2i_X509_CRL_\fR\fI...\fR and \fBi2d_X509_CRL_\fR\fI...\fR
175 \&\fBX509_REQ_\fR\fI...\fR, \fBd2i_X509_REQ_\fR\fI...\fR and \fBi2d_X509_REQ_\fR\fI...\fR
176 handle PKCS#10 certificate requests.
178 \&\fBX509_NAME_\fR\fI...\fR handle certificate names.
180 \&\fBX509_ATTRIBUTE_\fR\fI...\fR handle certificate attributes.
182 \&\fBX509_EXTENSION_\fR\fI...\fR handle certificate extensions.
184 .IX Header "SEE ALSO"
185 \&\fIX509_NAME_ENTRY_get_object\fR\|(3),
186 \&\fIX509_NAME_add_entry_by_txt\fR\|(3),
187 \&\fIX509_NAME_add_entry_by_NID\fR\|(3),
188 \&\fIX509_NAME_print_ex\fR\|(3),
189 \&\fIX509_NAME_new\fR\|(3),
190 \&\fId2i_X509\fR\|(3),
191 \&\fId2i_X509_ALGOR\fR\|(3),
192 \&\fId2i_X509_CRL\fR\|(3),
193 \&\fId2i_X509_NAME\fR\|(3),
194 \&\fId2i_X509_REQ\fR\|(3),
195 \&\fId2i_X509_SIG\fR\|(3),