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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
+.\"
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+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
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+.\"
+.\" Required to disable full justification in groff 1.23.0.
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+.\" ========================================================================
+.\"
+.IX Title "X509_CHECK_CA 3ossl"
+.TH X509_CHECK_CA 3ossl 2026-04-07 3.5.6 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_ca \- check if given certificate is CA certificate
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/x509v3.h>
+\&
+\& int X509_check_ca(X509 *cert);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+This function checks if given certificate is CA certificate (can be used
+to sign other certificates). The certificate must be a complete certificate
+otherwise an error is returned.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+Function return 0, if it is not CA certificate, 1 if it is proper X509v3
+CA certificate with \fBbasicConstraints\fR extension CA:TRUE,
+3, if it is self\-signed X509 v1 certificate, 4, if it is certificate with
+\&\fBkeyUsage\fR extension with bit \fBkeyCertSign\fR set, but without
+\&\fBbasicConstraints\fR, and 5 if it has outdated Netscape Certificate Type
+extension telling that it is CA certificate.
+.PP
+This function will also return 0 on error.
+.PP
+Actually, any nonzero value means that this certificate could have been
+used to sign other certificates.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBX509_verify_cert\fR\|(3),
+\&\fBX509_check_issued\fR\|(3),
+\&\fBX509_check_purpose\fR\|(3)
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2015\-2021 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+<https://www.openssl.org/source/license.html>.