linux/arch/x86/crypto/crc32-pclmul_glue.c

/* GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see http://www.gnu.org/licenses
 *
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 * information or have any questions.
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 * GPL HEADER END
 */

/*
 * Copyright 2012 Xyratex Technology Limited
 *
 * Wrappers for kernel crypto shash api to pclmulqdq crc32 implementation.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/crc32.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>

#include <asm/cpufeatures.h>
#include <asm/cpu_device_id.h>
#include <asm/simd.h>

#define CHKSUM_BLOCK_SIZE …
#define CHKSUM_DIGEST_SIZE …

#define PCLMUL_MIN_LEN …
#define SCALE_F …
#define SCALE_F_MASK …

u32 crc32_pclmul_le_16(unsigned char const *buffer, size_t len, u32 crc32);

static u32 __attribute__((pure))
	crc32_pclmul_le(u32 crc, unsigned char const *p, size_t len)
{ … }

static int crc32_pclmul_cra_init(struct crypto_tfm *tfm)
{ … }

static int crc32_pclmul_setkey(struct crypto_shash *hash, const u8 *key,
			unsigned int keylen)
{ … }

static int crc32_pclmul_init(struct shash_desc *desc)
{ … }

static int crc32_pclmul_update(struct shash_desc *desc, const u8 *data,
			       unsigned int len)
{ … }

/* No final XOR 0xFFFFFFFF, like crc32_le */
static int __crc32_pclmul_finup(u32 *crcp, const u8 *data, unsigned int len,
				u8 *out)
{ … }

static int crc32_pclmul_finup(struct shash_desc *desc, const u8 *data,
			      unsigned int len, u8 *out)
{ … }

static int crc32_pclmul_final(struct shash_desc *desc, u8 *out)
{ … }

static int crc32_pclmul_digest(struct shash_desc *desc, const u8 *data,
			       unsigned int len, u8 *out)
{ … }

static struct shash_alg alg = …;

static const struct x86_cpu_id crc32pclmul_cpu_id[] = …;
MODULE_DEVICE_TABLE(x86cpu, crc32pclmul_cpu_id);


static int __init crc32_pclmul_mod_init(void)
{ … }

static void __exit crc32_pclmul_mod_fini(void)
{ … }

module_init(…) …;
module_exit(crc32_pclmul_mod_fini);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;

MODULE_ALIAS_CRYPTO(…) …;
MODULE_ALIAS_CRYPTO(…) …;