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.\" ========================================================================
.\"
.IX Title "X509_CHECK_ISSUED 3"
.TH X509_CHECK_ISSUED 3 "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_check_issued \- checks if certificate is apparently issued by another certificate
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509v3.h>
\&
\& int X509_check_issued(X509 *issuer, X509 *subject);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIX509_check_issued()\fR checks if certificate \fIsubject\fR was apparently issued
using (\s-1CA\s0) certificate \fIissuer\fR. This function takes into account not only
matching of the issuer field of \fIsubject\fR with the subject field of \fIissuer\fR,
but also compares all sub-fields of the \fBauthorityKeyIdentifier\fR extension of
\&\fIsubject\fR, as far as present, with the respective \fBsubjectKeyIdentifier\fR,
serial number, and issuer fields of \fIissuer\fR, as far as present. It also checks
if the \fBkeyUsage\fR field (if present) of \fIissuer\fR allows certificate signing.
It does not check the certificate signature.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
Function return \fBX509_V_OK\fR if certificate \fIsubject\fR is issued by
\&\fIissuer\fR or some \fBX509_V_ERR*\fR constant to indicate an error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIX509_verify_cert\fR\|(3),
\&\fIX509_check_ca\fR\|(3),
\&\fIverify\fR\|(1)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2020 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>.