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/*
* Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
* ARM NEON instructions.
*
* Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*
* This file is based on sha1_generic.c and sha1_ssse3_glue.c:
* Copyright (c) Alan Smithee.
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
* Copyright (c) Mathias Krause <minipli@googlemail.com>
* Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>
#include <crypto/sha1_base.h>
#include <asm/neon.h>
#include <asm/simd.h>
#include "sha1.h"
asmlinkage void sha1_transform_neon(void *state_h, const char *data,
unsigned int rounds);
static int sha1_neon_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha1_state *sctx = shash_desc_ctx(desc);
if (!may_use_simd() ||
(sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
return sha1_update_arm(desc, data, len);
kernel_neon_begin();
sha1_base_do_update(desc, data, len,
(sha1_block_fn *)sha1_transform_neon);
kernel_neon_end();
return 0;
}
static int sha1_neon_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
if (!may_use_simd())
return sha1_finup_arm(desc, data, len, out);
kernel_neon_begin();
if (len)
sha1_base_do_update(desc, data, len,
(sha1_block_fn *)sha1_transform_neon);
sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon);
kernel_neon_end();
return sha1_base_finish(desc, out);
}
static int sha1_neon_final(struct shash_desc *desc, u8 *out)
{
return sha1_neon_finup(desc, NULL, 0, out);
}
static struct shash_alg alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_base_init,
.update = sha1_neon_update,
.final = sha1_neon_final,
.finup = sha1_neon_finup,
.descsize = sizeof(struct sha1_state),
.base = {
.cra_name = "sha1",
.cra_driver_name = "sha1-neon",
.cra_priority = 250,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
static int __init sha1_neon_mod_init(void)
{
if (!cpu_has_neon())
return -ENODEV;
return crypto_register_shash(&alg);
}
static void __exit sha1_neon_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
module_init(sha1_neon_mod_init);
module_exit(sha1_neon_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
MODULE_ALIAS_CRYPTO("sha1");
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