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Title "SSL_CTX_set_cipher_list 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_CTX_set_cipher_list, SSL_set_cipher_list - choose list of available SSL_CIPHERs Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" \fISSL_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 \fBssl objects created from ctx.

\fISSL_set_cipher_list() sets the list of ciphers only for ssl.

Header "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. \s-1ADH\s0 ciphers don't need a certificate, but DH-parameters must have been set. All other ciphers need a corresponding certificate and key.

A \s-1RSA\s0 cipher can only be chosen, when a \s-1RSA\s0 certificate is available. \s-1RSA\s0 export ciphers with a keylength of 512 bits for the \s-1RSA\s0 key require a temporary 512 bit \s-1RSA\s0 key, as typically the supplied key has a length of 1024 bit (see \fISSL_CTX_set_tmp_rsa_callback\|(3)). \s-1RSA\s0 ciphers using \s-1EDH\s0 need a certificate and key and additional DH-parameters (see SSL_CTX_set_tmp_dh_callback\|(3)).

A \s-1DSA\s0 cipher can only be chosen, when a \s-1DSA\s0 certificate is available. \s-1DSA\s0 ciphers always use \s-1DH\s0 key exchange and therefore need DH-parameters (see SSL_CTX_set_tmp_dh_callback\|(3)).

When these conditions are not met for any cipher in the list (e.g. a client only supports export \s-1RSA\s0 ciphers with a asymmetric key length of 512 bits and the server is not configured to use temporary \s-1RSA\s0 keys), the \*(L"no shared cipher\*(R" (\s-1SSL_R_NO_SHARED_CIPHER\s0) error is generated and the handshake will fail.

Header "RETURN VALUES" \fISSL_CTX_set_cipher_list() and SSL_set_cipher_list() return 1 if any cipher could be selected and 0 on complete failure. Header "SEE ALSO" \fIssl\|(3), SSL_get_ciphers\|(3), \fISSL_CTX_use_certificate\|(3), \fISSL_CTX_set_tmp_rsa_callback\|(3), \fISSL_CTX_set_tmp_dh_callback\|(3), \fIciphers\|(1)