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