This is a 5-round Feistel type 128 bit block cipher using addition mod 2^32 and
XOR in combining eight 16x32 bit substitutions as the round function.<br>
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Max key length is 256 bits, encryption is the same as decryption.<br>
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The sboxes are psuedo random and key dependent.<br>
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First a passphrase is hashed to 256 bits using a slow custom hash function.
Second the 256 bits obtained from the first step are used to seed to a fast
fibonacci type PRNG with Knuth's algorithm M extension. The PRNG is then used to
produce bits for eight 16x32 sboxes.<br>