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BSD 2.11 - man page for makekey (bsd section 8)

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MAKEKEY(8)									       MAKEKEY(8)

NAME
       makekey - generate encryption key

SYNOPSIS
       /usr/sbin/makekey

DESCRIPTION
       Makekey improves the usefulness of encryption schemes depending on a key by increasing the
       amount of time required to search the key space.  It reads  10  bytes  from  its  standard
       input,  and  writes 13 bytes on its standard output.  The output depends on the input in a
       way intended to be difficult to compute (that is, to require a substantial fraction  of	a
       second).

       The  first  eight input bytes (the input key) can be arbitrary ASCII characters.  The last
       two (the salt) are best chosen from the set of digits, upper- and lower-case letters,  and
       `.'  and `/'.  The salt characters are repeated as the first two characters of the output.
       The remaining 11 output characters are chosen from the same set as the salt and constitute
       the output key.

       The  transformation performed is essentially the following: the salt is used to select one
       of 4096 cryptographic machines all based on the National Bureau	of  Standards  DES  algo-
       rithm, but modified in 4096 different ways.  Using the input key as key, a constant string
       is fed into the machine and recirculated a number of times.  The 64 bits that come out are
       distributed into the 66 useful key bits in the result.

       Makekey	is intended for programs that perform encryption (for instance, ed and crypt(1)).
       Usually makekey's input and output will be pipes.

SEE ALSO
       crypt(1), ed(1)

7th Edition				 October 23, 1996			       MAKEKEY(8)
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