[CRYPTO] twofish: Split out common c code

This patch splits up the twofish crypto routine into a common part ( key
setup  ) which will be uses by all twofish crypto modules ( generic-c , i586
assembler and x86_64 assembler ) and generic-c part. It also creates a new
header file which will be used by all 3 modules.

This eliminates all code duplication.

Correctness was verified with the tcrypt module and automated test scripts.

Signed-off-by: Joachim Fritschi <jfritschi@freenet.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 8 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index ba133d55704..5472f693e6e 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -131,6 +131,7 @@ config CRYPTO_BLOWFISH
 config CRYPTO_TWOFISH
         tristate "Twofish cipher algorithm"
         depends on CRYPTO
+        select CRYPTO_TWOFISH_COMMON
         help
           Twofish cipher algorithm.
           
@@ -142,6 +143,13 @@ config CRYPTO_TWOFISH
           See also:
           <http://www.schneier.com/twofish.html>
 
+config CRYPTO_TWOFISH_COMMON
+        tristate
+        depends on CRYPTO
+        help
+          Common parts of the Twofish cipher algorithm shared by the
+          generic c and the assembler implementations.
+
 config CRYPTO_SERPENT
         tristate "Serpent cipher algorithm"
         depends on CRYPTO