From c494e0705d670c51ac736c8c4d92750705fe3187 Mon Sep 17 00:00:00 2001 From: Rik Snel Date: Wed, 29 Nov 2006 18:59:44 +1100 Subject: [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 Signed-off-by: Herbert Xu --- crypto/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'crypto/Kconfig') diff --git a/crypto/Kconfig b/crypto/Kconfig index 4495e46660bf..f941ffb2a087 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -139,6 +139,16 @@ config CRYPTO_TGR192 See also: . +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 -- cgit v1.2.3