crypto: vmac - New hash algorithm for intel_txt support

This patch adds VMAC (a fast MAC) support into crypto framework.

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Joseph Cihula <joseph.cihula@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -269,6 +269,18 @@ config CRYPTO_XCBC
 		http://csrc.nist.gov/encryption/modes/proposedmodes/
 		 xcbc-mac/xcbc-mac-spec.pdf
 
+config CRYPTO_VMAC
+	tristate "VMAC support"
+	depends on EXPERIMENTAL
+	select CRYPTO_HASH
+	select CRYPTO_MANAGER
+	help
+	  VMAC is a message authentication algorithm designed for
+	  very high speed on 64-bit architectures.
+
+	  See also:
+	  <http://fastcrypto.org/vmac>
+
 comment "Digest"
 
 config CRYPTO_CRC32C

crypto/Makefile

@@ -32,6 +32,7 @@ cryptomgr-objs := algboss.o testmgr.o
 
 obj-$(CONFIG_CRYPTO_MANAGER2) += cryptomgr.o
 obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
+obj-$(CONFIG_CRYPTO_VMAC) += vmac.o
 obj-$(CONFIG_CRYPTO_XCBC) += xcbc.o
 obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o
 obj-$(CONFIG_CRYPTO_MD4) += md4.o

crypto/tcrypt.c

@@ -719,6 +719,10 @@ static int do_test(int m)
 		ret += tcrypt_test("hmac(rmd160)");
 		break;
 
+	case 109:
+		ret += tcrypt_test("vmac(aes)");
+		break;
+
 	case 150:
 		ret += tcrypt_test("ansi_cprng");
 		break;

crypto/testmgr.c

@@ -2247,6 +2247,15 @@ static const struct alg_test_desc alg_test_descs[] = {
 				.count = TGR192_TEST_VECTORS
 			}
 		}
+	}, {
+		.alg = "vmac(aes)",
+		.test = alg_test_hash,
+		.suite = {
+			.hash = {
+				.vecs = aes_vmac128_tv_template,
+				.count = VMAC_AES_TEST_VECTORS
+			}
+		}
 	}, {
 		.alg = "wp256",
 		.test = alg_test_hash,

crypto/testmgr.h

@@ -1654,6 +1654,22 @@ static struct hash_testvec aes_xcbc128_tv_template[] = {
 	}
 };
 
+#define VMAC_AES_TEST_VECTORS	1
+static char vmac_string[128] = {'\x01', '\x01', '\x01', '\x01',
+				'\x02', '\x03', '\x02', '\x02',
+				'\x02', '\x04', '\x01', '\x07',
+				'\x04', '\x01', '\x04', '\x03',};
+static struct hash_testvec aes_vmac128_tv_template[] = {
+	{
+		.key    = "\x00\x01\x02\x03\x04\x05\x06\x07"
+			  "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f",
+		.plaintext = vmac_string,
+		.digest = "\xcb\xd7\x8a\xfd\xb7\x33\x79\xe7",
+		.psize  = 128,
+		.ksize  = 16,
+	},
+};
+
 /*
  * SHA384 HMAC test vectors from RFC4231
  */

include/crypto/vmac.h

@@ -0,0 +1,61 @@
+/*
+ * Modified to interface to the Linux kernel
+ * Copyright (c) 2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef __CRYPTO_VMAC_H
+#define __CRYPTO_VMAC_H
+
+/* --------------------------------------------------------------------------
+ * VMAC and VHASH Implementation by Ted Krovetz (tdk@acm.org) and Wei Dai.
+ * This implementation is herby placed in the public domain.
+ * The authors offers no warranty. Use at your own risk.
+ * Please send bug reports to the authors.
+ * Last modified: 17 APR 08, 1700 PDT
+ * ----------------------------------------------------------------------- */
+
+/*
+ * User definable settings.
+ */
+#define VMAC_TAG_LEN	64
+#define VMAC_KEY_SIZE	128/* Must be 128, 192 or 256			*/
+#define VMAC_KEY_LEN	(VMAC_KEY_SIZE/8)
+#define VMAC_NHBYTES	128/* Must 2^i for any 3 < i < 13 Standard = 128*/
+
+/*
+ * This implementation uses u32 and u64 as names for unsigned 32-
+ * and 64-bit integer types. These are defined in C99 stdint.h. The
+ * following may need adaptation if you are not running a C99 or
+ * Microsoft C environment.
+ */
+struct vmac_ctx {
+	u64 nhkey[(VMAC_NHBYTES/8)+2*(VMAC_TAG_LEN/64-1)];
+	u64 polykey[2*VMAC_TAG_LEN/64];
+	u64 l3key[2*VMAC_TAG_LEN/64];
+	u64 polytmp[2*VMAC_TAG_LEN/64];
+	u64 cached_nonce[2];
+	u64 cached_aes[2];
+	int first_block_processed;
+};
+
+typedef u64 vmac_t;
+
+struct vmac_ctx_t {
+	struct crypto_cipher *child;
+	struct vmac_ctx __vmac_ctx;
+};
+
+#endif /* __CRYPTO_VMAC_H */