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1 | =pod |
2 | ||
3 | =head1 NAME | |
4 | ||
5 | X509_check_ca - check if given certificate is CA certificate | |
6 | ||
7 | =head1 SYNOPSIS | |
8 | ||
e9b77246 | 9 | #include <openssl/x509v3.h> |
c03726ca | 10 | |
e9b77246 | 11 | int X509_check_ca(X509 *cert); |
c03726ca RS |
12 | |
13 | =head1 DESCRIPTION | |
14 | ||
15 | This function checks if given certificate is CA certificate (can be used | |
16 | to sign other certificates). | |
17 | ||
18 | =head1 RETURN VALUE | |
19 | ||
20 | Function return 0, if it is not CA certificate, 1 if it is proper X509v3 | |
21 | CA certificate with B<basicConstraints> extension CA:TRUE, | |
0ad69cd6 | 22 | 3, if it is self-signed X509 v1 certificate, 4, if it is certificate with |
c03726ca RS |
23 | B<keyUsage> extension with bit B<keyCertSign> set, but without |
24 | B<basicConstraints>, and 5 if it has outdated Netscape Certificate Type | |
25 | extension telling that it is CA certificate. | |
26 | ||
27 | Actually, any non-zero value means that this certificate could have been | |
28 | used to sign other certificates. | |
29 | ||
30 | =head1 SEE ALSO | |
31 | ||
32 | L<X509_verify_cert(3)>, | |
33 | L<X509_check_issued(3)>, | |
34 | L<X509_check_purpose(3)> | |
35 | ||
e2f92610 RS |
36 | =head1 COPYRIGHT |
37 | ||
38 | Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved. | |
39 | ||
40 | Licensed under the OpenSSL license (the "License"). You may not use | |
41 | this file except in compliance with the License. You can obtain a copy | |
42 | in the file LICENSE in the source distribution or at | |
43 | L<https://www.openssl.org/source/license.html>. | |
44 | ||
45 | =cut |