=pod

=head1 NAME

SSL_CTX_set_cipher_list, SSL_set_cipher_list 
- choose list of available SSL_CIPHERs

=head1 SYNOPSIS

 #include <openssl/ssl.h>

 int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str);
 int SSL_set_cipher_list(SSL *ssl, const char *str);

=head1 DESCRIPTION

SSL_CTX_set_cipher_list() sets the list of available ciphers for B<ctx>
using the control string B<str>. The format of the string is described
in L<ciphers(1)|ciphers(1)>. The list of ciphers is inherited by all
B<ssl> objects created from B<ctx>.

SSL_set_cipher_list() sets the list of ciphers only for B<ssl>.

=head1 NOTES

The control string B<str> should be universally usable and not depend
on details of the library configuration (ciphers compiled in). Thus no
syntax checking takes place. Items that are not recognized, because the
corresponding ciphers are not compiled in or because they are mistyped,
are simply ignored. Failure is only flagged if no ciphers could be collected
at all.

It should be noted, that inclusion of a cipher to be used into the list is
a necessary condition. On the client side, the inclusion into the list is
also sufficient. On the server side, additional restrictions apply. All ciphers
have additional requirements. ADH ciphers don't need a certificate, but
DH-parameters must have been set. All other ciphers need a corresponding
certificate and key. A RSA cipher can only be chosen, when a RSA certificate is
available, the respective is valid for DSA ciphers. Ciphers using EDH need
a certificate and key and DH-parameters.

=head1 RETURN VALUES

SSL_CTX_set_cipher_list() and SSL_set_cipher_list() return 1 if any cipher
could be selected and 0 on complete failure.

=head1 SEE ALSO

L<ssl(3)|ssl(3)>, L<SSL_get_ciphers(3)|SSL_get_ciphers(3)>,
L<ciphers(1)|ciphers(1)>

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