I did a double-take when I saw the set of hashing algorithm identifier values (used as a parameter to the ztv2ghashs hashing function)..
0xf00d means: Use MD4
0xdead means: Use SHA1
0xbeaf means: Use MD5
Ah! It's an oldie but a goodie. Brings back schoolboy memories of getting your LCD calculator to spell out well-known petroleum companies.
And good to see that even in the depths of Oracle Development there's a willingness to do something a little special, for no reason other than because they can.