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>

1 files changed, 61 insertions, 0 deletions

diff --git a/include/crypto/vmac.h b/include/crypto/vmac.h
new file mode 100644
index 000000000000..c4467c55df1e
--- /dev/null
+++ b/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 */