Re: [Classpathx-crypto] [patch] Inlined Serpent

[Casey Marshall]

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Raif S. Naffah wrote:
| hello Casey,
|
| [...]
|
| | ...By the way with this
| | version GNU's Serpent will be faster than BouncyCastle's.
|
| have you compared the performance of other algorithms?
|

Where they intersect (the "cool" AES candidates Rijndael, Serpent, and
Twofish) BC wins with Twofish, while GNU's Rijndael does better.

Take, of course, these benchmarks with as large a grain of salt as you
see fit 8-).

|
| | | i see some advantages in keeping the current implementation _and_
| adding
| | | the new in-lined one as an alternative; say SerpentInLined? (naming
| | | suggestions are welcome)
| | |
| |
| | I wonder if a naming scheme following "SerpentSBoxImpl" or something
| | similar is more appropriate, since what we're talking about here is a
| | particular implementation of "bit-sliced" S-Boxes.
|
| with the figures of the new implementation, do we still want to keep both?
|

I don't see any compelling reason to keep the old one. Plus I like the
new version better -- passing arrays to the S-box and transform methods
was clever, but probably not the best way to do it.

As one more idea, attached is a version of Serpent that Dag sent me that
replaces the int[] version of the session key with a new class,
SerpentKey, which just has 132 integer fields k0..k131. This avoids
bounds-checking, and I can get this version up to 15MB/s when compiled
with GCJ.

- --
Casey Marshall < address@hidden > http://metastatic.org/
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serpent-gcj.tar.gz
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