doc/man3/X509_check_issued.pod

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