[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>

crypto/Kconfig

@@ -206,6 +206,15 @@ config CRYPTO_CTR
 	  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

crypto/Makefile

@@ -33,6 +33,7 @@ obj-$(CONFIG_CRYPTO_PCBC) += pcbc.o
 obj-$(CONFIG_CRYPTO_LRW) += lrw.o
 obj-$(CONFIG_CRYPTO_XTS) += xts.o
 obj-$(CONFIG_CRYPTO_CTR) += ctr.o
+obj-$(CONFIG_CRYPTO_GCM) += gcm.o
 obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
 obj-$(CONFIG_CRYPTO_DES) += des_generic.o
 obj-$(CONFIG_CRYPTO_FCRYPT) += fcrypt.o

crypto/tcrypt.c

@@ -13,6 +13,7 @@
  * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
+ * 2007-11-13 Added GCM tests
  * 2007-11-13 Added AEAD support
  * 2007-11-06 Added SHA-224 and SHA-224-HMAC tests
  * 2006-12-07 Added SHA384 HMAC and SHA512 HMAC tests
@@ -1208,6 +1209,10 @@ static void do_test(void)
 			    AES_CTR_ENC_TEST_VECTORS);
 		test_cipher("ctr(aes,4,8,4)", DECRYPT, aes_ctr_dec_tv_template,
 			    AES_CTR_DEC_TEST_VECTORS);
+		test_aead("gcm(aes)", ENCRYPT, aes_gcm_enc_tv_template,
+			  AES_GCM_ENC_TEST_VECTORS);
+		test_aead("gcm(aes)", DECRYPT, aes_gcm_dec_tv_template,
+			  AES_GCM_DEC_TEST_VECTORS);
 
 		//CAST5
 		test_cipher("ecb(cast5)", ENCRYPT, cast5_enc_tv_template,