crypto: s390 - add System z hardware support for GHASH

This patch adds System z hardware acceleration support for the GHASH
algorithm for GCM (Galois/Counter Mode).
The hardware support is available beginning with System z196.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 78df36adbe6c..d459cc7894d9 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -151,6 +151,16 @@ config S390_PRNG
           ANSI X9.17 standard. The PRNG is usable via the char device
           /dev/prandom.
 
+config CRYPTO_GHASH_S390
+        tristate "GHASH digest algorithm"
+        depends on S390
+        select CRYPTO_HASH
+        help
+          This is the s390 hardware accelerated implementation of the
+          GHASH message digest algorithm for GCM (Galois/Counter Mode).
+
+          It is available as of z196.
+
 config CRYPTO_DEV_MV_CESA
         tristate "Marvell's Cryptographic Engine"
         depends on PLAT_ORION