| =pod |
| |
| =head1 NAME |
| |
| X509_check_issued - checks if certificate is apparently issued by another |
| certificate |
| |
| =head1 SYNOPSIS |
| |
| #include <openssl/x509v3.h> |
| |
| int X509_check_issued(X509 *issuer, X509 *subject); |
| |
| |
| =head1 DESCRIPTION |
| |
| X509_check_issued() checks if certificate I<subject> was apparently issued |
| using (CA) certificate I<issuer>. This function takes into account not only |
| matching of the issuer field of I<subject> with the subject field of I<issuer>, |
| but also compares all sub-fields of the B<authorityKeyIdentifier> extension of |
| I<subject>, as far as present, with the respective B<subjectKeyIdentifier>, |
| serial number, and issuer fields of I<issuer>, as far as present. It also checks |
| if the B<keyUsage> field (if present) of I<issuer> allows certificate signing. |
| It does not actually check the certificate signature. An error is returned |
| if the I<issuer> or the I<subject> are incomplete certificates. |
| |
| =head1 RETURN VALUES |
| |
| X509_check_issued() returns B<X509_V_OK> if all checks are successful |
| or some B<X509_V_ERR*> constant to indicate an error. |
| |
| =head1 SEE ALSO |
| |
| L<X509_verify_cert(3)>, L<X509_verify(3)>, L<X509_check_ca(3)>, |
| L<openssl-verify(1)>, L<X509_self_signed(3)> |
| |
| =head1 COPYRIGHT |
| |
| Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved. |
| |
| 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 |
| L<https://www.openssl.org/source/license.html>. |
| |
| =cut |
