crypto: sha256 - Create module providing optimized SHA256 routines using SSSE3, AVX or AVX2 instructions.

We added glue code and config options to create crypto
module that uses SSE/AVX/AVX2 optimized SHA256 x86_64 assembly routines.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/Kconfig b/crypto/Kconfig
index aed52b2..8064ef1 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -470,6 +470,17 @@
 	  using Supplemental SSE3 (SSSE3) instructions or Advanced Vector
 	  Extensions (AVX), when available.
 
+config CRYPTO_SHA256_SSSE3
+	tristate "SHA256 digest algorithm (SSSE3/AVX/AVX2)"
+	depends on X86 && 64BIT
+	select CRYPTO_SHA256
+	select CRYPTO_HASH
+	help
+	  SHA-256 secure hash standard (DFIPS 180-2) implemented
+	  using Supplemental SSE3 (SSSE3) instructions, or Advanced Vector
+	  Extensions version 1 (AVX1), or Advanced Vector Extensions
+	  version 2 (AVX2) instructions, when available.
+
 config CRYPTO_SHA1_SPARC64
 	tristate "SHA1 digest algorithm (SPARC64)"
 	depends on SPARC64