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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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No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u)).13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu8/10-\(#H)'\'\h"\|\\n:u" . ds ` \\k:\h'-(\\n(.wu8/10-\(#H)'\`\h'\|\\n:u' . ds ^ \\k:\h'-(\\n(.wu10/11-\(#H)'^\h'\|\\n:u' . ds , \\k:\h'-(\\n(.wu8/10)',\h'\|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\(#H-.1m)'~\h'\|\\n:u' . ds / \\k:\h'-(\\n(.wu8/10-\(#H)'\z\(sl\h'\|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu8/10-\(#H+.1m+\(#F)'\v'-\(#V'\z.\h'.2m+\(#F'.\h'\|\\n:u'\v'\(#V' .ds 8 \h'\(#H'\(b\h'-\(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\(#H)/2u'\v'-.3n'\(#[\z\(de\v'.3n'\h'\|\\n:u'\(#] .ds d- \h'\(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'\|\\n:u' .ds th \(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u2/3)'\s-1o\s+1\(#] .ds Th \(#[\s+2I\s-2\h'-\w'I'u3/5'\v'-.3m'o\v'.3m'\(#] .ds ae a\h'-(\w'a'u4/10)'e .ds Ae A\h'-(\w'A'u4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu9/10-\(#H)'\s-2\u~\d\s+2\h'\|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu10/11-\(#H)'\v'-.4m'^\v'.4m'\h'\|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "X509 7" .TH X509 7 "2023-09-11" "1.1.1w" "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. 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>.