[linux-2.6-block.git] / arch / arm / crypto / sha1-ce-glue.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
 *
 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
 */

#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <crypto/sha.h>
#include <crypto/sha1_base.h>
#include <linux/cpufeature.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 (!crypto_simd_usable() ||
	    (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 (!crypto_simd_usable())
		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_blocksize		= SHA1_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
};

static int __init sha1_ce_mod_init(void)
{
	return crypto_register_shash(&alg);
}

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

module_cpu_feature_match(SHA1, sha1_ce_mod_init);
module_exit(sha1_ce_mod_fini);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
864cbeed AB	2	/*
	3	* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
	4	*
	5	* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
864cbeed AB	6	*/
	7
	8	#include <crypto/internal/hash.h>
99680c5e	9	#include <crypto/internal/simd.h>
864cbeed	10	#include <crypto/sha.h>
dde00981	11	#include <crypto/sha1_base.h>
bd56f95e	12	#include <linux/cpufeature.h>
864cbeed AB	13	#include <linux/crypto.h>
	14	#include <linux/module.h>
	15
864cbeed AB	16	#include <asm/hwcap.h>
	17	#include <asm/neon.h>
	18	#include <asm/simd.h>
864cbeed	19
90451d6b AB	20	#include "sha1.h"
90451d6b AB	21
864cbeed AB	22	MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
	23	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	24	MODULE_LICENSE("GPL v2");
	25
dde00981 AB	26	asmlinkage void sha1_ce_transform(struct sha1_state sst, u8 const src,
dde00981 AB	27	int blocks);
864cbeed	28
dde00981 AB	29	static int sha1_ce_update(struct shash_desc desc, const u8 data,
dde00981 AB	30	unsigned int len)
864cbeed AB	31	{
	32	struct sha1_state *sctx = shash_desc_ctx(desc);
	33
99680c5e	34	if (!crypto_simd_usable() \|\|
dde00981	35	(sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
864cbeed AB	36	return sha1_update_arm(desc, data, len);
864cbeed AB	37
dde00981 AB	38	kernel_neon_begin();
	39	sha1_base_do_update(desc, data, len, sha1_ce_transform);
	40	kernel_neon_end();
864cbeed	41
864cbeed AB	42	return 0;
	43	}
	44
dde00981 AB	45	static int sha1_ce_finup(struct shash_desc desc, const u8 data,
dde00981 AB	46	unsigned int len, u8 *out)
864cbeed	47	{
99680c5e	48	if (!crypto_simd_usable())
dde00981	49	return sha1_finup_arm(desc, data, len, out);
864cbeed	50
dde00981 AB	51	kernel_neon_begin();
	52	if (len)
	53	sha1_base_do_update(desc, data, len, sha1_ce_transform);
	54	sha1_base_do_finalize(desc, sha1_ce_transform);
	55	kernel_neon_end();
864cbeed	56
dde00981	57	return sha1_base_finish(desc, out);
864cbeed AB	58	}
864cbeed AB	59
dde00981	60	static int sha1_ce_final(struct shash_desc desc, u8 out)
864cbeed	61	{
dde00981	62	return sha1_ce_finup(desc, NULL, 0, out);
864cbeed AB	63	}
	64
	65	static struct shash_alg alg = {
dde00981 AB	66	.init = sha1_base_init,
	67	.update = sha1_ce_update,
	68	.final = sha1_ce_final,
	69	.finup = sha1_ce_finup,
864cbeed AB	70	.descsize = sizeof(struct sha1_state),
864cbeed AB	71	.digestsize = SHA1_DIGEST_SIZE,
864cbeed AB	72	.base = {
	73	.cra_name = "sha1",
	74	.cra_driver_name = "sha1-ce",
	75	.cra_priority = 200,
864cbeed AB	76	.cra_blocksize = SHA1_BLOCK_SIZE,
	77	.cra_module = THIS_MODULE,
	78	}
	79	};
	80
	81	static int __init sha1_ce_mod_init(void)
	82	{
864cbeed AB	83	return crypto_register_shash(&alg);
	84	}
	85
	86	static void __exit sha1_ce_mod_fini(void)
	87	{
	88	crypto_unregister_shash(&alg);
	89	}
	90
bd56f95e	91	module_cpu_feature_match(SHA1, sha1_ce_mod_init);
864cbeed	92	module_exit(sha1_ce_mod_fini);