a temporary 512 bit RSA key, as typically the supplied key has a length
of 1024 bit (see
L<SSL_CTX_set_tmp_rsa_callback(3)|SSL_CTX_set_tmp_rsa_callback(3)>).
-RSA ciphers using EDH need a certificate and key and additional DH-parameters
+RSA ciphers using DHE need a certificate and key and additional DH-parameters
(see L<SSL_CTX_set_tmp_dh_callback(3)|SSL_CTX_set_tmp_dh_callback(3)>).
A DSA cipher can only be chosen, when a DSA certificate is available.