The OpenSSL wiki states that there is support for built-in standard sets of Diffie-Hellman parameters (http://wiki.openssl.org/index.php/Diffie_Hellman#Working_with_Parameters_and_Generating_Keys). However, I was unable to find any documentation about which sets of parameters those actually are - short of browsing the source code, that is. I suppose that (at least) the groups from RFC 5114 should be supported, but I'm not sure. Can somebody point me into the right direction?
Thanks, Jochen