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X509_check_ca.3
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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 \s-1CA\s0 certificate (can be used to sign other certificates). .SH "RETURN VALUES" .IX Header "RETURN VALUES" Function return 0, if it is not \s-1CA\s0 certificate, 1 if it is proper X509v3 \&\s-1CA\s0 certificate with \fBbasicConstraints\fR extension \s-1CA:TRUE, 3,\s0 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with \&\fBkeyUsage\fR extension with bit \fBkeyCertSign\fR set, but without \&\fBbasicConstraints\fR, and 5 if it has outdated Netscape Certificate Type extension telling that it is \s-1CA\s0 certificate. .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\-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>.
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