=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 check the certificate signature. =head1 RETURN VALUES Function return B<X509_V_OK> if certificate I<subject> is issued by I<issuer> or some B<X509_V_ERR*> constant to indicate an error. =head1 SEE ALSO L<X509_verify_cert(3)>, L<X509_check_ca(3)>, L<verify(1)> =head1 COPYRIGHT Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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 |