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| author | Rik Snel <rsnel@cube.dyndns.org> | 2006-11-29 08:59:44 +0100 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-07 03:38:55 +0100 |
| commit | c494e0705d670c51ac736c8c4d92750705fe3187 (patch) | |
| tree | 9f00826afc317f976c03ef4e77284b13204c0c9d /crypto/lrw.c | |
| parent | [CRYPTO] lib: some common 128-bit block operations, nicely centralized (diff) | |
| download | linux-c494e0705d670c51ac736c8c4d92750705fe3187.tar.xz linux-c494e0705d670c51ac736c8c4d92750705fe3187.zip | |
[CRYPTO] lib: table driven multiplications in GF(2^128)
A lot of cypher modes need multiplications in GF(2^128). LRW, ABL, GCM...
I use functions from this library in my LRW implementation and I will
also use them in my ABL (Arbitrary Block Length, an unencumbered (correct
me if I am wrong, wide block cipher mode).
Elements of GF(2^128) must be presented as u128 *, it encourages automatic
and proper alignment.
The library contains support for two different representations of GF(2^128),
see the comment in gf128mul.h. There different levels of optimization
(memory/speed tradeoff).
The code is based on work by Dr Brian Gladman. Notable changes:
- deletion of two optimization modes
- change from u32 to u64 for faster handling on 64bit machines
- support for 'bbe' representation in addition to the, already implemented,
'lle' representation.
- move 'inline void' functions from header to 'static void' in the
source file
- update to use the linux coding style conventions
The original can be found at:
http://fp.gladman.plus.com/AES/modes.vc8.19-06-06.zip
The copyright (and GPL statement) of the original author is preserved.
Signed-off-by: Rik Snel <rsnel@cube.dyndns.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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