[mirror_ubuntu-bionic-kernel.git] / arch / arm / crypto / sha1-ce-glue.c

/*
 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
 *
 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <crypto/internal/hash.h>
#include <crypto/sha.h>
#include <crypto/sha1_base.h>
#include <linux/crypto.h>
#include <linux/module.h>

#include <asm/hwcap.h>
#include <asm/neon.h>
#include <asm/simd.h>

#include "sha1.h"

MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
				  int blocks);

static int sha1_ce_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_ce_transform);
	kernel_neon_end();

	return 0;
}

static int sha1_ce_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_ce_transform);
	sha1_base_do_finalize(desc, sha1_ce_transform);
	kernel_neon_end();

	return sha1_base_finish(desc, out);
}

static int sha1_ce_final(struct shash_desc *desc, u8 *out)
{
	return sha1_ce_finup(desc, NULL, 0, out);
}

static struct shash_alg alg = {
	.init			= sha1_base_init,
	.update			= sha1_ce_update,
	.final			= sha1_ce_final,
	.finup			= sha1_ce_finup,
	.descsize		= sizeof(struct sha1_state),
	.digestsize		= SHA1_DIGEST_SIZE,
	.base			= {
		.cra_name		= "sha1",
		.cra_driver_name	= "sha1-ce",
		.cra_priority		= 200,
		.cra_flags		= CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize		= SHA1_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
};

static int __init sha1_ce_mod_init(void)
{
	if (!(elf_hwcap2 & HWCAP2_SHA1))
		return -ENODEV;
	return crypto_register_shash(&alg);
}

static void __exit sha1_ce_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

module_init(sha1_ce_mod_init);
module_exit(sha1_ce_mod_fini);
Commit	Line	Data
864cbeed AB	1	/*
	2	* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
	3	*
	4	* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <crypto/internal/hash.h>
	12	#include <crypto/sha.h>
dde00981	13	#include <crypto/sha1_base.h>
864cbeed AB	14	#include <linux/crypto.h>
	15	#include <linux/module.h>
	16
864cbeed AB	17	#include <asm/hwcap.h>
	18	#include <asm/neon.h>
	19	#include <asm/simd.h>
864cbeed	20
90451d6b AB	21	#include "sha1.h"
90451d6b AB	22
864cbeed AB	23	MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
	24	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	25	MODULE_LICENSE("GPL v2");
	26
dde00981 AB	27	asmlinkage void sha1_ce_transform(struct sha1_state sst, u8 const src,
dde00981 AB	28	int blocks);
864cbeed	29
dde00981 AB	30	static int sha1_ce_update(struct shash_desc desc, const u8 data,
dde00981 AB	31	unsigned int len)
864cbeed AB	32	{
	33	struct sha1_state *sctx = shash_desc_ctx(desc);
	34
dde00981 AB	35	if (!may_use_simd() \|\|
dde00981 AB	36	(sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
864cbeed AB	37	return sha1_update_arm(desc, data, len);
864cbeed AB	38
dde00981 AB	39	kernel_neon_begin();
	40	sha1_base_do_update(desc, data, len, sha1_ce_transform);
	41	kernel_neon_end();
864cbeed	42
864cbeed AB	43	return 0;
	44	}
	45
dde00981 AB	46	static int sha1_ce_finup(struct shash_desc desc, const u8 data,
dde00981 AB	47	unsigned int len, u8 *out)
864cbeed	48	{
dde00981 AB	49	if (!may_use_simd())
dde00981 AB	50	return sha1_finup_arm(desc, data, len, out);
864cbeed	51
dde00981 AB	52	kernel_neon_begin();
	53	if (len)
	54	sha1_base_do_update(desc, data, len, sha1_ce_transform);
	55	sha1_base_do_finalize(desc, sha1_ce_transform);
	56	kernel_neon_end();
864cbeed	57
dde00981	58	return sha1_base_finish(desc, out);
864cbeed AB	59	}
864cbeed AB	60
dde00981	61	static int sha1_ce_final(struct shash_desc desc, u8 out)
864cbeed	62	{
dde00981	63	return sha1_ce_finup(desc, NULL, 0, out);
864cbeed AB	64	}
	65
	66	static struct shash_alg alg = {
dde00981 AB	67	.init = sha1_base_init,
	68	.update = sha1_ce_update,
	69	.final = sha1_ce_final,
	70	.finup = sha1_ce_finup,
864cbeed AB	71	.descsize = sizeof(struct sha1_state),
864cbeed AB	72	.digestsize = SHA1_DIGEST_SIZE,
864cbeed AB	73	.base = {
	74	.cra_name = "sha1",
	75	.cra_driver_name = "sha1-ce",
	76	.cra_priority = 200,
	77	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	78	.cra_blocksize = SHA1_BLOCK_SIZE,
	79	.cra_module = THIS_MODULE,
	80	}
	81	};
	82
	83	static int __init sha1_ce_mod_init(void)
	84	{
	85	if (!(elf_hwcap2 & HWCAP2_SHA1))
	86	return -ENODEV;
	87	return crypto_register_shash(&alg);
	88	}
	89
	90	static void __exit sha1_ce_mod_fini(void)
	91	{
	92	crypto_unregister_shash(&alg);
	93	}
	94
	95	module_init(sha1_ce_mod_init);
	96	module_exit(sha1_ce_mod_fini);