NAME

       X509_add_cert, X509_add_certs - X509 certificate list addition functions

SYNOPSIS

        #include <openssl/x509.h>

        int X509_add_cert(STACK_OF(X509) *sk, X509 *cert, int flags);
        int X509_add_certs(STACK_OF(X509) *sk, STACK_OF(X509) *certs, int flags);

DESCRIPTION

       X509_add_cert() adds a certificate cert to the given list sk.

       X509_add_certs() adds a list of certificate certs to the given list sk.  The certs
       argument may be NULL, which implies no effect.  It does not modify the list certs but in
       case the X509_ADD_FLAG_UP_REF flag (described below) is set the reference counters of
       those of its members added to sk are increased.

       Both these functions have a flags parameter, which is used to control details of the
       operation.

       The value X509_ADD_FLAG_DEFAULT, which equals 0, means no special semantics.

       If X509_ADD_FLAG_UP_REF is set then the reference counts of those certificates added
       successfully are increased.

       If X509_ADD_FLAG_PREPEND is set then the certifcates are prepended to sk.  By default they
       are appended to sk.  In both cases the original order of the added certificates is
       preserved.

       If X509_ADD_FLAG_NO_DUP is set then certificates already contained in sk, which is
       determined using X509_cmp(3), are ignored.

       If X509_ADD_FLAG_NO_SS is set then certificates that are marked self-signed, which is
       determined using X509_self_signed(3), are ignored.

RETURN VALUES

       Both functions return 1 for success and 0 for failure.

NOTES

       If X509_add_certs() is used with the flags X509_ADD_FLAG_NO_DUP or X509_ADD_FLAG_NO_SS it
       is advisable to use also X509_ADD_FLAG_UP_REF because otherwise likely not for all members
       of the certs list the ownership is transferred to the list of certificates sk.

       Care should also be taken in case the certs argument equals sk.

SEE ALSO

       X509_cmp(3) X509_self_signed(3)

HISTORY

       The functions X509_add_cert() and X509_add_certs() were added in OpenSSL 3.0.

COPYRIGHT

       Copyright 2019-2020 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>.