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/*
* Glue code for the SHA256 Secure Hash Algorithm assembly implementation
* using optimized ARM assembler and NEON instructions.
*
* Copyright © 2015 Google Inc.
*
* This file is based on sha256_ssse3_glue.c:
* Copyright (C) 2013 Intel Corporation
* Author: Tim Chen <tim.c.chen@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/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <linux/string.h>
#include <crypto/sha.h>
#include <crypto/sha256_base.h>
#include <asm/simd.h>
#include <asm/neon.h>
#include "sha256_glue.h"
asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
unsigned int num_blks);
int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
/* make sure casting to sha256_block_fn() is safe */
BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
return sha256_base_do_update(desc, data, len,
(sha256_block_fn *)sha256_block_data_order);
}
EXPORT_SYMBOL(crypto_sha256_arm_update);
static int sha256_final(struct shash_desc *desc, u8 *out)
{
sha256_base_do_finalize(desc,
(sha256_block_fn *)sha256_block_data_order);
return sha256_base_finish(desc, out);
}
int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
sha256_base_do_update(desc, data, len,
(sha256_block_fn *)sha256_block_data_order);
return sha256_final(desc, out);
}
EXPORT_SYMBOL(crypto_sha256_arm_finup);
static struct shash_alg algs[] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_base_init,
.update = crypto_sha256_arm_update,
.final = sha256_final,
.finup = crypto_sha256_arm_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name = "sha256-asm",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
.init = sha224_base_init,
.update = crypto_sha256_arm_update,
.final = sha256_final,
.finup = crypto_sha256_arm_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name = "sha224-asm",
.cra_priority = 150,
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static int __init sha256_mod_init(void)
{
int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
if (res < 0)
return res;
if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
res = crypto_register_shashes(sha256_neon_algs,
ARRAY_SIZE(sha256_neon_algs));
if (res < 0)
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}
return res;
}
static void __exit sha256_mod_fini(void)
{
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
crypto_unregister_shashes(sha256_neon_algs,
ARRAY_SIZE(sha256_neon_algs));
}
module_init(sha256_mod_init);
module_exit(sha256_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
MODULE_ALIAS_CRYPTO("sha256");
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