[CRYPTO] salsa20: Add x86-64 assembly version

This is the x86-64 version of the Salsa20 stream cipher algorithm. The
original assembly code came from
<http://cr.yp.to/snuffle/salsa20/amd64-3/salsa20.s>. It has been
reformatted for clarity.

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

1 files changed, 15 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 221356b4150c..b0481f7b002a 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -504,6 +504,21 @@ config CRYPTO_SALSA20_586
           The Salsa20 stream cipher algorithm is designed by Daniel J.
           Bernstein <djb@cr.yp.to>. See <http://cr.yp.to/snuffle.html>
 
+config CRYPTO_SALSA20_X86_64
+        tristate "Salsa20 stream cipher algorithm (x86_64) (EXPERIMENTAL)"
+        depends on (X86 || UML_X86) && 64BIT
+        depends on EXPERIMENTAL
+        select CRYPTO_BLKCIPHER
+        select CRYPTO_SALSA20
+        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"
         select CRYPTO_ALGAPI