SSL_CTX_set_cipher_list, SSL_set_cipher_list - choose list
of available SSL_CIPHERs
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);
DESCRIPTION
SSL_CTX_set_cipher_list() sets the list of available
ciphers for ctx using the control string str. The format
of the string is described in ciphers(1). The list of
ciphers is inherited by all ssl objects created from ctx.
SSL_set_cipher_list() sets the list of ciphers only for
ssl.
NOTES
The control string 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.
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.
SEE ALSO
ssl(3), SSL_get_ciphers(3), SSL_CTX_use_certificate(3),
ciphers(1)
Man(1) output converted with
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