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authorRik Snel <rsnel@cube.dyndns.org>2006-11-29 18:59:44 +1100
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-06 18:38:55 -0800
commitc494e0705d670c51ac736c8c4d92750705fe3187 (patch)
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[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>
Diffstat (limited to 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 4495e46..f941ffb 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -139,6 +139,16 @@ config CRYPTO_TGR192
See also:
<http://www.cs.technion.ac.il/~biham/Reports/Tiger/>.
+config CRYPTO_GF128MUL
+ tristate "GF(2^128) multiplication functions (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ help
+ Efficient table driven implementation of multiplications in the
+ field GF(2^128). This is needed by some cypher modes. This
+ option will be selected automatically if you select such a
+ cipher mode. Only select this option by hand if you expect to load
+ an external module that requires these functions.
+
config CRYPTO_ECB
tristate "ECB support"
select CRYPTO_BLKCIPHER