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Remove the phrase 'for any use' - implied by the conditions.
Add 'All rights reserved.' after the (C) notice.
Remove the name+URL in the text and lead off with a statement that
Botan is distributed under the following terms: <blah>
Combine the two all-CAPS sentences disclaiming warranty into a single
paragraph.
The main reasoning behind this is to make the actual license text
totally equivalent to the FreeBSD/NetBSD licenses, which is an offical
Open Source(tm) license as declared by the OSI.
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Combine the fast and slow polls, into a single poll() operation.
Instead of being given a buffer to write output into, the EntropySource is
passed an Entropy_Accumulator. This handles the RLE encoding that xor_into_buf
used to do. It also contains a cached I/O buffer so entropy sources do not
individually need to allocate memory for that with each poll. When data
is added to the accumulator, the source specifies an estimate of the number
of bits of entropy per byte, as a double. This is tracked in the accumulator.
Once the estimated entropy hits a target (set by the constructor), the
accumulator's member function predicate polling_goal_achieved flips to true.
This signals to the PRNG that it can stop performing polling on sources,
also polls that take a long time periodically check this flag and return
immediately.
The Win32 and BeOS entropy sources have been updated, but blindly; testing
is needed.
The test_es example program has been modified: now it polls twice and outputs
the XOR of the two collected results. That helps show if the output is consistent
across polls (not a good thing). I have noticed on the Unix entropy source,
occasionally there are many 0x00 bytes in the output, which is not optimal.
This also needs to be investigated.
The RLE is not actually RLE anymore. It works well for non-random inputs
(ASCII text, etc), but I noticed that when /dev/random output was fed into
it, the output buffer would end up being RR01RR01RR01 where RR is a random
byte and 00 is the byte count.
The buffer sizing also needs to be examined carefully. It might be useful
to choose a prime number for the size to XOR stuff into, to help ensure an
even distribution of entropy across the entire buffer space. Or: feed it
all into a hash function?
This change should (perhaps with further modifications) help WRT the
concerns Zack W raised about the RNG on the monotone-dev list.
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the people who worked on InSiTo are from that organization). They
were listed as a copyright holder in the InSiTo license file but not
individually in any source file, so I missed them before now.
Also mark Martin Doering's copyright as 2007-2008 (also to match InSiTo's
license.txt)
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so it is clear (when the license text is redistributed) what
the license text is actually referring to.
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license file, before I forget.
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find square roots modulo a prime. Contributed by FlexSecure GmbH
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a) I am sure we really want to include this (proprietary, unanalyzed?)
PRNG in Botan
b) I have a chance to add test cases and clean up the code.
Also note a few more changes in the changelog, and set a provisial release
date for sometime in July.
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Java SecureRandom PRNG algorithm. (I accidentally checked in the header
in the previous revision).
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the actual copyright holders. For rationale, see my post to botan-devel
on April 9, subject 'Changing license to directly reflect contributors'
(http://www.randombit.net/pipermail/botan-devel/2008-April/000527.html)
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but might as well keep it up to date. And it's easier to do it once with
a 'perl -pi' command than to update each file over time.
Apologies to anyone looking at diffs.
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