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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.
RC4 is a registered trademark of RSA Laboratories.
--
Copyright © 2010 William Ahern
Copyright © 2012 Guillem Jover <guillem@hadrons.org>
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--
This code implements the MD5 message-digest algorithm. The algorithm is due to Ron
Rivest. This code was written by Colin Plumb in 1993, no copyright is claimed. This code
is in the public domain; do with it what you wish.
Equivalent code is available from RSA Data Security, Inc. This code has been tested
against that, and is equivalent, except that you don't need to include two pages of
legalese with every copy.
To compute the message digest of a chunk of bytes, declare an MD5Context structure,
pass it to MD5Init, call MD5Update as needed on buffers full of bytes, and then call