to elaborate a little...
You need apache webserver from http://httpd.apache.org/
pached with the SSL module from http://www.modssl.org/.
The patch is a source code patch, and for now, you have to recompile apache. That is unless you download a precompiled version for your system. There are precompiled apache+modssl binaries around I'm sure. You'll have to look around.
The documentation on these sites will probably help you further.