Updated: 2022/Sep/29

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X509_check_issued(3)                OpenSSL               X509_check_issued(3)



NAME
       X509_check_issued - checks if certificate is apparently issued by
       another certificate

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/x509v3.h>

        int X509_check_issued(X509 *issuer, X509 *subject);

DESCRIPTION
       X509_check_issued() checks if certificate subject was apparently issued
       using (CA) certificate issuer. This function takes into account not
       only matching of the issuer field of subject with the subject field of
       issuer, but also compares all sub-fields of the authorityKeyIdentifier
       extension of subject, as far as present, with the respective
       subjectKeyIdentifier, serial number, and issuer fields of issuer, as
       far as present. It also checks if the keyUsage field (if present) of
       issuer allows certificate signing.  It does not actually check the
       certificate signature. An error is returned if the issuer or the
       subject are incomplete certificates.

RETURN VALUES
       X509_check_issued() returns X509_V_OK if all checks are successful or
       some X509_V_ERR* constant to indicate an error.

SEE ALSO
       X509_verify_cert(3), X509_verify(3), X509_check_ca(3),
       openssl-verify(1), X509_self_signed(3)

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
       <https://www.openssl.org/source/license.html>.



3.0.12                            2023-05-07              X509_check_issued(3)