| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | X509_check_issued - checks if certificate is apparently issued by another
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| 6 | certificate
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| 7 |
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| 8 | =head1 SYNOPSIS
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| 9 |
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| 10 | #include <openssl/x509v3.h>
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| 11 |
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| 12 | int X509_check_issued(X509 *issuer, X509 *subject);
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| 13 |
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| 14 |
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| 15 | =head1 DESCRIPTION
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| 16 |
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| 17 | X509_check_issued() checks if certificate I<subject> was apparently issued
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| 18 | using (CA) certificate I<issuer>. This function takes into account not only
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| 19 | matching of the issuer field of I<subject> with the subject field of I<issuer>,
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| 20 | but also compares all sub-fields of the B<authorityKeyIdentifier> extension of
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| 21 | I<subject>, as far as present, with the respective B<subjectKeyIdentifier>,
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| 22 | serial number, and issuer fields of I<issuer>, as far as present. It also checks
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| 23 | if the B<keyUsage> field (if present) of I<issuer> allows certificate signing.
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| 24 | It does not actually check the certificate signature. An error is returned
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| 25 | if the I<issuer> or the I<subject> are incomplete certificates.
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| 26 |
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| 27 | =head1 RETURN VALUES
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| 28 |
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| 29 | X509_check_issued() returns B<X509_V_OK> if all checks are successful
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| 30 | or some B<X509_V_ERR*> constant to indicate an error.
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| 31 |
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| 32 | =head1 SEE ALSO
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| 33 |
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| 34 | L<X509_verify_cert(3)>, L<X509_verify(3)>, L<X509_check_ca(3)>,
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| 35 | L<openssl-verify(1)>, L<X509_self_signed(3)>
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| 36 |
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| 37 | =head1 COPYRIGHT
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| 38 |
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| 39 | Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 40 |
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| 41 | Licensed under the Apache License 2.0 (the "License"). You may not use
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| 42 | this file except in compliance with the License. You can obtain a copy
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| 43 | in the file LICENSE in the source distribution or at
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| 44 | L<https://www.openssl.org/source/license.html>.
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| 45 |
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| 46 | =cut
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