[linux-2.6-block.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/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 (!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)
{
	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
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>
bd56f95e	14	#include <linux/cpufeature.h>
864cbeed AB	15	#include <linux/crypto.h>
	16	#include <linux/module.h>
	17
864cbeed AB	18	#include <asm/hwcap.h>
	19	#include <asm/neon.h>
	20	#include <asm/simd.h>
864cbeed	21
90451d6b AB	22	#include "sha1.h"
90451d6b AB	23
864cbeed AB	24	MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
	25	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	26	MODULE_LICENSE("GPL v2");
	27
dde00981 AB	28	asmlinkage void sha1_ce_transform(struct sha1_state sst, u8 const src,
dde00981 AB	29	int blocks);
864cbeed	30
dde00981 AB	31	static int sha1_ce_update(struct shash_desc desc, const u8 data,
dde00981 AB	32	unsigned int len)
864cbeed AB	33	{
	34	struct sha1_state *sctx = shash_desc_ctx(desc);
	35
dde00981 AB	36	if (!may_use_simd() \|\|
dde00981 AB	37	(sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
864cbeed AB	38	return sha1_update_arm(desc, data, len);
864cbeed AB	39
dde00981 AB	40	kernel_neon_begin();
	41	sha1_base_do_update(desc, data, len, sha1_ce_transform);
	42	kernel_neon_end();
864cbeed	43
864cbeed AB	44	return 0;
	45	}
	46
dde00981 AB	47	static int sha1_ce_finup(struct shash_desc desc, const u8 data,
dde00981 AB	48	unsigned int len, u8 *out)
864cbeed	49	{
dde00981 AB	50	if (!may_use_simd())
dde00981 AB	51	return sha1_finup_arm(desc, data, len, out);
864cbeed	52
dde00981 AB	53	kernel_neon_begin();
	54	if (len)
	55	sha1_base_do_update(desc, data, len, sha1_ce_transform);
	56	sha1_base_do_finalize(desc, sha1_ce_transform);
	57	kernel_neon_end();
864cbeed	58
dde00981	59	return sha1_base_finish(desc, out);
864cbeed AB	60	}
864cbeed AB	61
dde00981	62	static int sha1_ce_final(struct shash_desc desc, u8 out)
864cbeed	63	{
dde00981	64	return sha1_ce_finup(desc, NULL, 0, out);
864cbeed AB	65	}
	66
	67	static struct shash_alg alg = {
dde00981 AB	68	.init = sha1_base_init,
	69	.update = sha1_ce_update,
	70	.final = sha1_ce_final,
	71	.finup = sha1_ce_finup,
864cbeed AB	72	.descsize = sizeof(struct sha1_state),
864cbeed AB	73	.digestsize = SHA1_DIGEST_SIZE,
864cbeed AB	74	.base = {
	75	.cra_name = "sha1",
	76	.cra_driver_name = "sha1-ce",
	77	.cra_priority = 200,
	78	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	79	.cra_blocksize = SHA1_BLOCK_SIZE,
	80	.cra_module = THIS_MODULE,
	81	}
	82	};
	83
	84	static int __init sha1_ce_mod_init(void)
	85	{
864cbeed AB	86	return crypto_register_shash(&alg);
	87	}
	88
	89	static void __exit sha1_ce_mod_fini(void)
	90	{
	91	crypto_unregister_shash(&alg);
	92	}
	93
bd56f95e	94	module_cpu_feature_match(SHA1, sha1_ce_mod_init);
864cbeed	95	module_exit(sha1_ce_mod_fini);