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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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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. An 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 attribute), 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\-2021 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>.
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