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Force Research Laboratory, Air Force Materiel Command, USAF, under agreement
number F39502-99-1-0512
--
Copyright © 1996 by Internet Software Consortium.
Permission to use, copy, modify, and distribute this software for any purpose with or
without fee is hereby granted, provided that the above copyright notice and this
permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
--
Copyright © 1996, David Mazieres <dm@uun.org>
Copyright © 2008, Damien Miller <djm@openbsd.org>
Permission to use, copy, modify, and distribute this software for any purpose with or
without fee is hereby granted, provided that the above copyright notice and this
permission notice appear in all copies.
Modification and redistribution in source and binary forms is permitted provided that due
credit is given to the author and the OpenBSD project (for instance by leaving this
copyright notice intact).
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
This code is derived from section 17.1 of Applied Cryptography, second edition, which
describes a stream cipher allegedly compatible with RSA Labs "RC4" cipher (the actual
description of which is a trade secret). The same algorithm is used as a stream cipher
called "arcfour" in Tatu Ylonen's ssh package.
Here the stream cipher has been modified always to include the time when initializing
the state. That makes it impossible to regenerate the same random sequence twice, so
this can't be used for encryption, but will generate good random numbers.
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