1=pod 2 3=head1 NAME 4 5X509_add_cert, 6X509_add_certs - 7X509 certificate list addition functions 8 9=head1 SYNOPSIS 10 11 #include <openssl/x509.h> 12 13 int X509_add_cert(STACK_OF(X509) *sk, X509 *cert, int flags); 14 int X509_add_certs(STACK_OF(X509) *sk, STACK_OF(X509) *certs, int flags); 15 16=head1 DESCRIPTION 17 18X509_add_cert() adds a certificate I<cert> to the given list I<sk>. 19 20X509_add_certs() adds a list of certificate I<certs> to the given list I<sk>. 21The I<certs> argument may be NULL, which implies no effect. 22It does not modify the list I<certs> but 23in case the B<X509_ADD_FLAG_UP_REF> flag (described below) is set 24the reference counters of those of its members added to I<sk> are increased. 25 26Both these functions have a I<flags> parameter, 27which is used to control details of the operation. 28 29The value B<X509_ADD_FLAG_DEFAULT>, which equals 0, means no special semantics. 30 31If B<X509_ADD_FLAG_UP_REF> is set then 32the reference counts of those certificates added successfully are increased. 33 34If B<X509_ADD_FLAG_PREPEND> is set then the certificates are prepended to I<sk>. 35By default they are appended to I<sk>. 36In both cases the original order of the added certificates is preserved. 37 38If B<X509_ADD_FLAG_NO_DUP> is set then certificates already contained in I<sk>, 39which is determined using L<X509_cmp(3)>, are ignored. 40 41If B<X509_ADD_FLAG_NO_SS> is set then certificates that are marked self-signed, 42which is determined using L<X509_self_signed(3)>, are ignored. 43 44=head1 RETURN VALUES 45 46Both functions return 1 for success and 0 for failure. 47 48=head1 NOTES 49 50If X509_add_certs() is used with the flags B<X509_ADD_FLAG_NO_DUP> or 51B<X509_ADD_FLAG_NO_SS> it is advisable to use also B<X509_ADD_FLAG_UP_REF> 52because otherwise likely not for all members of the I<certs> list 53the ownership is transferred to the list of certificates I<sk>. 54 55Care should also be taken in case the I<certs> argument equals I<sk>. 56 57=head1 SEE ALSO 58 59L<X509_cmp(3)> 60L<X509_self_signed(3)> 61 62=head1 HISTORY 63 64The functions X509_add_cert() and X509_add_certs() 65were added in OpenSSL 3.0. 66 67=head1 COPYRIGHT 68 69Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved. 70 71Licensed under the Apache License 2.0 (the "License"). You may not use 72this file except in compliance with the License. You can obtain a copy 73in the file LICENSE in the source distribution or at 74L<https://www.openssl.org/source/license.html>. 75 76=cut 77
