[CRYPTO] gcm: New algorithm

Add GCM/GMAC support to cryptoapi.

GCM (Galois/Counter Mode) is an AEAD mode of operations for any block cipher
with a block size of 16.  The typical example is AES-GCM.

Signed-off-by: Mikko Herranen <mh1@iki.fi>
Reviewed-by: Mika Kukkonen <mika.kukkonen@nsn.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 8d6cac9..40ae92c 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -206,6 +206,15 @@
 	  CTR: Counter mode
 	  This block cipher algorithm is required for IPSec.
 
+config CRYPTO_GCM
+	tristate "GCM/GMAC support"
+	select CRYPTO_CTR
+	select CRYPTO_AEAD
+	select CRYPTO_GF128MUL
+	help
+	  Support for Galois/Counter Mode (GCM) and Galois Message
+	  Authentication Code (GMAC). Required for IPSec.
+
 config CRYPTO_CRYPTD
 	tristate "Software async crypto daemon"
 	select CRYPTO_ABLKCIPHER