linux-imx

/*

 * VMAC: Message Authentication Code using Universal Hashing

 *

 * Reference: https://tools.ietf.org/html/draft-krovetz-vmac-01

 *

 * Copyright (c) 2009, Intel Corporation.

 * Copyright (c) 2018, Google Inc.

 *

 * 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.

 */

​

/*

 * Derived from:

 *  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.

 *  Last modified: 17 APR 08, 1700 PDT

 */

​

#include <asm/unaligned.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/crypto.h>

#include <linux/module.h>

#include <linux/scatterlist.h>

#include <asm/byteorder.h>

#include <crypto/scatterwalk.h>

#include <crypto/internal/hash.h>

​

/*

 * 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*/

#define VMAC_NONCEBYTES 16

​

/* per-transform (per-key) context */

struct vmac_tfm_ctx {

    struct crypto_cipher *cipher;

    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];

};

​

/* per-request context */

struct vmac_desc_ctx {

    union {

        u8 partial[VMAC_NHBYTES];   /* partial block */

        __le64 partial_words[VMAC_NHBYTES / 8];

    };