SSLCTXsetcipherlist(3) OpenSSL SSLCTXsetcipherlist(3)

NAME
       SSLCTXsetcipherlist, SSLsetcipherlist - choose list of available
       SSLCIPHERs

SYNOPSIS
        #include 

        int SSLCTXsetcipherlist(SSLCTX *ctx, const char *str);
        int SSLsetcipherlist(SSL *ssl, const char *str);

DESCRIPTION
       SSLCTXsetcipherlist() sets the list of available ciphers for ccttxx
       using the control string ssttrr. The format of the string is described in
       ciphers(1). The list of ciphers is inherited by all ssssll objects created
       from ccttxx.

       SSLsetcipherlist() sets the list of ciphers only for ssssll.

NNOOTTEESS
       The control string ssttrr 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.
       RSA export ciphers with a keylength of 512 bits for the RSA key require
       a temporary 512 bit RSA key, as typically the supplied key has a length
       of 1024 bit (see SSLCTXsettmprsacallback(3)).  RSA ciphers using
       EDH need a certificate and key and additional DH-parameters (see
       SSLCTXsettmpdhcallback(3)).

       A DSA cipher can only be chosen, when a DSA certificate is available.
       DSA ciphers always use DH key exchange and therefore need DH-parameters
       (see SSLCTXsettmpdhcallback(3)).

       When these conditions are not met for any cipher in the list (e.g. a
       client only supports export RSA ciphers with a asymmetric key length of
       512 bits and the server is not configured to use temporary RSA keys),
       the "no shared cipher" (SSLRNOSHAREDCIPHER) error is generated and
       the handshake will fail.

RETURN VALUES
       SSLCTXsetcipherlist() and SSLsetcipherlist() return 1 if any
       cipher could be selected and 0 on complete failure.

SEE ALSO
       ssl(3), SSLgetciphers(3), SSLCTXusecertificate(3),
       SSLCTXsettmprsacallback(3), SSLCTXsettmpdhcallback(3),
       ciphers(1)



0.9.7l                            2001-07-23        SSLCTXsetcipherlist(3)