5 SSL_CTX_set_cipher_list, SSL_set_cipher_list - choose list of available SSL_CIPHERs
9 #include <openssl/ssl.h>
11 int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str);
12 int SSL_set_cipher_list(SSL *ssl, const char *str);
16 SSL_CTX_set_cipher_list() sets the list of available ciphers for B<ctx>
17 using the control string B<str>. The format of the string is described
18 in L<ciphers(1)|ciphers(1)>. The list of ciphers is inherited by all
19 B<ssl> objects created from B<ctx>.
21 SSL_set_cipher_list() sets the list of ciphers only for B<ssl>.
25 The control string B<str> should be universally usable and not depend
26 on details of the library configuration (ciphers compiled in). Thus no
27 syntax checking takes place. Items that are not recognized, because the
28 corresponding ciphers are not compiled in or because they are mistyped,
29 are simply ignored. Failure is only flagged if no ciphers could be collected
32 It should be noted, that inclusion of a cipher to be used into the list is
33 a necessary condition. On the client side, the inclusion into the list is
34 also sufficient. On the server side, additional restrictions apply. All ciphers
35 have additional requirements. ADH ciphers don't need a certificate, but
36 DH-parameters must have been set. All other ciphers need a corresponding
37 certificate and key. A RSA cipher can only be chosen, when a RSA certificate is
38 available, the respective is valid for DSA ciphers. Ciphers using EDH need
39 a certificate and key and DH-parameters.
43 SSL_CTX_set_cipher_list() and SSL_set_cipher_list() return 1 if any cipher
44 could be selected and 0 on complete failure.
48 L<ssl(3)|ssl(3)>, L<SSL_get_ciphers(3)|SSL_get_ciphers(3)>,
49 L<SSL_CTX_use_certificate(3)|SSL_CTX_use_certificate(3)>,
50 L<ciphers(1)|ciphers(1)>