Bryd400, version 1.2.   Copyright Svend Olaf Mikkelsen, 1999.

DES "bitslice" S-boxes: Copyright Matthew Kwan, 1998.

Usage:     Bryd400 <first password character set> <hexadecimal ciphertext>
                   [<max password length>] [<hexadecimal plaintext>]
Examples:  Bryd400 TUV 01FC5A6BE7BC6929
           Bryd400 all 01FC5A6BE7BC6929 4 4B47532140232425
Benchmark: Bryd400 benchmark

Searches for a DES key, which encrypts the plaintext into the
supplied ciphertext.                                        

Keys are generated from passwords 1 to 7 bytes long containing
the characters ABCDEFGHIJKLMNOPQRSTUVWXYZ#$@_1234567890 and not
beginning with a digit. The password bits are copied into DES
key bit 1-64. Parity bits are skipped.

Returns 0 if a key is found.   A x586 CPU or higher is required.