[CRYPTO] salsa20: Salsa20 stream cipher

This patch implements the Salsa20 stream cipher using the blkcipher interface.

The core cipher code comes from Daniel Bernstein's submission to eSTREAM:
  http://www.ecrypt.eu.org/stream/svn/viewcvs.cgi/ecrypt/trunk/submissions/salsa20/full/ref/

The test vectors comes from:
  http://www.ecrypt.eu.org/stream/svn/viewcvs.cgi/ecrypt/trunk/submissions/salsa20/full/

It has been tested successfully with "modprobe tcrypt mode=34" on an
UML instance.

Signed-off-by: Tan Swee Heng <thesweeheng@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 12 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 7758454b9f17..8d6cac97021f 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -454,6 +454,18 @@ config CRYPTO_SEED
           See also:
           <http://www.kisa.or.kr/kisa/seed/jsp/seed_eng.jsp>
 
+config CRYPTO_SALSA20
+        tristate "Salsa20 stream cipher algorithm (EXPERIMENTAL)"
+        depends on EXPERIMENTAL
+        select CRYPTO_BLKCIPHER
+        help
+          Salsa20 stream cipher algorithm.
+
+          Salsa20 is a stream cipher submitted to eSTREAM, the ECRYPT
+          Stream Cipher Project. See <http://www.ecrypt.eu.org/stream/>
+
+          The Salsa20 stream cipher algorithm is designed by Daniel J.
+          Bernstein <djb@cr.yp.to>. See <http://cr.yp.to/snuffle.html>
 
 config CRYPTO_DEFLATE
         tristate "Deflate compression algorithm"