1X509_CHECK_CA(3ossl)                OpenSSL               X509_CHECK_CA(3ossl)
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NAME

6       X509_check_ca - check if given certificate is CA certificate
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SYNOPSIS

9        #include <openssl/x509v3.h>
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11        int X509_check_ca(X509 *cert);
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DESCRIPTION

14       This function checks if given certificate is CA certificate (can be
15       used to sign other certificates). The certificate must be a complete
16       certificate otherwise an error is returned.
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RETURN VALUES

19       Function return 0, if it is not CA certificate, 1 if it is proper
20       X509v3 CA certificate with basicConstraints extension CA:TRUE, 3, if it
21       is self-signed X509 v1 certificate, 4, if it is certificate with
22       keyUsage extension with bit keyCertSign set, but without
23       basicConstraints, and 5 if it has outdated Netscape Certificate Type
24       extension telling that it is CA certificate.
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26       This function will also return 0 on error.
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28       Actually, any nonzero value means that this certificate could have been
29       used to sign other certificates.
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SEE ALSO

32       X509_verify_cert(3), X509_check_issued(3), X509_check_purpose(3)
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35       Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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37       Licensed under the Apache License 2.0 (the "License").  You may not use
38       this file except in compliance with the License.  You can obtain a copy
39       in the file LICENSE in the source distribution or at
40       <https://www.openssl.org/source/license.html>.
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443.0.5                             2022-07-05              X509_CHECK_CA(3ossl)
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