crypto: ghash - Add GHASH digest algorithm for GCM

GHASH is implemented as a shash algorithm. The actual implementation
is copied from gcm.c. This makes it possible to add
architecture/hardware accelerated GHASH implementation.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index f2002d8e5f67..0ae170e01051 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -290,6 +290,13 @@ config CRYPTO_CRC32C_INTEL
           gain performance compared with software implementation.
           Module will be crc32c-intel.
 
+config CRYPTO_GHASH
+        tristate "GHASH digest algorithm"
+        select CRYPTO_SHASH
+        select CRYPTO_GF128MUL
+        help
+          GHASH is message digest algorithm for GCM (Galois/Counter Mode).
+
 config CRYPTO_MD4
         tristate "MD4 digest algorithm"
         select CRYPTO_HASH