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138 .TH x509 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 x509 \- X.509 certificate handling
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/x509.h>
153 .IX Header "DESCRIPTION"
154 A X.509 certificate is a structured grouping of information about
155 an individual, a device, or anything one can imagine. A X.509 \s-1CRL
156 \&\s0(certificate revocation list) is a tool to help determine if a
157 certificate is still valid. The exact definition of those can be
158 found in the X.509 document from ITU-T, or in \s-1RFC3280\s0 from \s-1PKIX.\s0
159 In OpenSSL, the type X509 is used to express such a certificate, and
160 the type X509_CRL is used to express a \s-1CRL.\s0
162 A related structure is a certificate request, defined in PKCS#10 from
163 \&\s-1RSA\s0 Security, Inc, also reflected in \s-1RFC2896. \s0 In OpenSSL, the type
164 X509_REQ is used to express such a certificate request.
166 To handle some complex parts of a certificate, there are the types
167 X509_NAME (to express a certificate name), X509_ATTRIBUTE (to express
168 a certificate attributes), X509_EXTENSION (to express a certificate
169 extension) and a few more.
171 Finally, there's the supertype X509_INFO, which can contain a \s-1CRL,\s0 a
172 certificate and a corresponding private key.
174 \&\fBX509_\fR\fI...\fR, \fBd2i_X509_\fR\fI...\fR and \fBi2d_X509_\fR\fI...\fR handle X.509
175 certificates, with some exceptions, shown below.
177 \&\fBX509_CRL_\fR\fI...\fR, \fBd2i_X509_CRL_\fR\fI...\fR and \fBi2d_X509_CRL_\fR\fI...\fR
180 \&\fBX509_REQ_\fR\fI...\fR, \fBd2i_X509_REQ_\fR\fI...\fR and \fBi2d_X509_REQ_\fR\fI...\fR
181 handle PKCS#10 certificate requests.
183 \&\fBX509_NAME_\fR\fI...\fR handle certificate names.
185 \&\fBX509_ATTRIBUTE_\fR\fI...\fR handle certificate attributes.
187 \&\fBX509_EXTENSION_\fR\fI...\fR handle certificate extensions.
189 .IX Header "SEE ALSO"
190 \&\fIX509_NAME_ENTRY_get_object\fR\|(3),
191 \&\fIX509_NAME_add_entry_by_txt\fR\|(3),
192 \&\fIX509_NAME_add_entry_by_NID\fR\|(3),
193 \&\fIX509_NAME_print_ex\fR\|(3),
194 \&\fIX509_NAME_new\fR\|(3),
195 \&\fId2i_X509\fR\|(3),
196 \&\fId2i_X509_ALGOR\fR\|(3),
197 \&\fId2i_X509_CRL\fR\|(3),
198 \&\fId2i_X509_NAME\fR\|(3),
199 \&\fId2i_X509_REQ\fR\|(3),
200 \&\fId2i_X509_SIG\fR\|(3),