=pod
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=head1 NAME
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X509_check_issued - checks if certificate is apparently issued by another
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certificate
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=head1 SYNOPSIS
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#include <openssl/x509v3.h>
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int X509_check_issued(X509 *issuer, X509 *subject);
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=head1 DESCRIPTION
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X509_check_issued() checks if certificate I<subject> was apparently issued
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using (CA) certificate I<issuer>. This function takes into account not only
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matching of the issuer field of I<subject> with the subject field of I<issuer>,
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but also compares all sub-fields of the B<authorityKeyIdentifier> extension of
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I<subject>, as far as present, with the respective B<subjectKeyIdentifier>,
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serial number, and issuer fields of I<issuer>, as far as present. It also checks
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if the B<keyUsage> field (if present) of I<issuer> allows certificate signing.
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It does not check the certificate signature.
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=head1 RETURN VALUES
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Function return B<X509_V_OK> if certificate I<subject> is issued by
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I<issuer> or some B<X509_V_ERR*> constant to indicate an error.
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=head1 SEE ALSO
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L<X509_verify_cert(3)>,
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L<X509_check_ca(3)>,
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L<verify(1)>
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=head1 COPYRIGHT
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Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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