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makekey(1) User Commands makekey(1)
makekey - generate encryption key
makekey improves the usefulness of encryption schemes that depend on a key by increasing
the amount of time required to search the key space. It attempts to read 8 bytes for its
key (the first eight input bytes), then it attempts to read 2 bytes for its salt (the last
two input bytes). 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 let-
ters. 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 4,096 cryptographic machines all based on the National Bureau of Standards DES algo-
rithm, but broken in 4,096 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 output key bits in the result.
makekey is intended for programs that perform encryption. Usually, its input and output
will be pipes.
ed(1), vi(1), passwd(4)
makekey can produce different results depending upon whether the input is typed at the
terminal or redirected from a file.
SunOS 5.11 3 Mar 2008 makekey(1)
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