[linux-2.6-block.git] / arch / arm64 / crypto / sha2-ce-glue.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
 *
 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
 */

#include <asm/neon.h>
#include <asm/simd.h>
#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <crypto/sha.h>
#include <crypto/sha256_base.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/module.h>

MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

struct sha256_ce_state {
	struct sha256_state	sst;
	u32			finalize;
};

asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
				  int blocks);

const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
					      sst.count);
const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
						 finalize);

asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);

static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
			    unsigned int len)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable())
		return sha256_base_do_update(desc, data, len,
				(sha256_block_fn *)sha256_block_data_order);

	sctx->finalize = 0;
	kernel_neon_begin();
	sha256_base_do_update(desc, data, len,
			      (sha256_block_fn *)sha2_ce_transform);
	kernel_neon_end();

	return 0;
}

static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
			   unsigned int len, u8 *out)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
	bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;

	if (!crypto_simd_usable()) {
		if (len)
			sha256_base_do_update(desc, data, len,
				(sha256_block_fn *)sha256_block_data_order);
		sha256_base_do_finalize(desc,
				(sha256_block_fn *)sha256_block_data_order);
		return sha256_base_finish(desc, out);
	}

	/*
	 * Allow the asm code to perform the finalization if there is no
	 * partial data and the input is a round multiple of the block size.
	 */
	sctx->finalize = finalize;

	kernel_neon_begin();
	sha256_base_do_update(desc, data, len,
			      (sha256_block_fn *)sha2_ce_transform);
	if (!finalize)
		sha256_base_do_finalize(desc,
					(sha256_block_fn *)sha2_ce_transform);
	kernel_neon_end();
	return sha256_base_finish(desc, out);
}

static int sha256_ce_final(struct shash_desc *desc, u8 *out)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable()) {
		sha256_base_do_finalize(desc,
				(sha256_block_fn *)sha256_block_data_order);
		return sha256_base_finish(desc, out);
	}

	sctx->finalize = 0;
	kernel_neon_begin();
	sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
	kernel_neon_end();
	return sha256_base_finish(desc, out);
}

static struct shash_alg algs[] = { {
	.init			= sha224_base_init,
	.update			= sha256_ce_update,
	.final			= sha256_ce_final,
	.finup			= sha256_ce_finup,
	.descsize		= sizeof(struct sha256_ce_state),
	.digestsize		= SHA224_DIGEST_SIZE,
	.base			= {
		.cra_name		= "sha224",
		.cra_driver_name	= "sha224-ce",
		.cra_priority		= 200,
		.cra_blocksize		= SHA256_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
}, {
	.init			= sha256_base_init,
	.update			= sha256_ce_update,
	.final			= sha256_ce_final,
	.finup			= sha256_ce_finup,
	.descsize		= sizeof(struct sha256_ce_state),
	.digestsize		= SHA256_DIGEST_SIZE,
	.base			= {
		.cra_name		= "sha256",
		.cra_driver_name	= "sha256-ce",
		.cra_priority		= 200,
		.cra_blocksize		= SHA256_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
} };

static int __init sha2_ce_mod_init(void)
{
	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}

static void __exit sha2_ce_mod_fini(void)
{
	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}

module_cpu_feature_match(SHA2, sha2_ce_mod_init);
module_exit(sha2_ce_mod_fini);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
6ba6c74d AB	2	/*
	3	* sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
	4	*
da179331	5	* Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
6ba6c74d AB	6	*/
	7
	8	#include <asm/neon.h>
da179331	9	#include <asm/simd.h>
6ba6c74d AB	10	#include <asm/unaligned.h>
6ba6c74d AB	11	#include <crypto/internal/hash.h>
e52b7023	12	#include <crypto/internal/simd.h>
6ba6c74d	13	#include <crypto/sha.h>
03802f6a	14	#include <crypto/sha256_base.h>
6ba6c74d AB	15	#include <linux/cpufeature.h>
	16	#include <linux/crypto.h>
	17	#include <linux/module.h>
	18
	19	MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
	20	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	21	MODULE_LICENSE("GPL v2");
	22
03802f6a AB	23	struct sha256_ce_state {
	24	struct sha256_state sst;
	25	u32 finalize;
	26	};
6ba6c74d	27
03802f6a AB	28	asmlinkage void sha2_ce_transform(struct sha256_ce_state sst, u8 const src,
03802f6a AB	29	int blocks);
6ba6c74d	30
f4857f4c AB	31	const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
	32	sst.count);
	33	const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
	34	finalize);
	35
da179331 AB	36	asmlinkage void sha256_block_data_order(u32 digest, u8 const src, int blocks);
da179331 AB	37
03802f6a AB	38	static int sha256_ce_update(struct shash_desc desc, const u8 data,
03802f6a AB	39	unsigned int len)
6ba6c74d	40	{
03802f6a	41	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
6ba6c74d	42
e52b7023	43	if (!crypto_simd_usable())
da179331 AB	44	return sha256_base_do_update(desc, data, len,
	45	(sha256_block_fn *)sha256_block_data_order);
	46
03802f6a	47	sctx->finalize = 0;
da179331	48	kernel_neon_begin();
03802f6a AB	49	sha256_base_do_update(desc, data, len,
	50	(sha256_block_fn *)sha2_ce_transform);
	51	kernel_neon_end();
6ba6c74d	52
6ba6c74d AB	53	return 0;
	54	}
	55
03802f6a AB	56	static int sha256_ce_finup(struct shash_desc desc, const u8 data,
03802f6a AB	57	unsigned int len, u8 *out)
6ba6c74d	58	{
03802f6a	59	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
6bd934de	60	bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
6ba6c74d	61
e52b7023	62	if (!crypto_simd_usable()) {
da179331 AB	63	if (len)
	64	sha256_base_do_update(desc, data, len,
	65	(sha256_block_fn *)sha256_block_data_order);
	66	sha256_base_do_finalize(desc,
	67	(sha256_block_fn *)sha256_block_data_order);
	68	return sha256_base_finish(desc, out);
	69	}
	70
6ba6c74d	71	/*
03802f6a AB	72	* Allow the asm code to perform the finalization if there is no
03802f6a AB	73	* partial data and the input is a round multiple of the block size.
6ba6c74d	74	*/
03802f6a	75	sctx->finalize = finalize;
6ba6c74d	76
da179331	77	kernel_neon_begin();
03802f6a AB	78	sha256_base_do_update(desc, data, len,
	79	(sha256_block_fn *)sha2_ce_transform);
	80	if (!finalize)
	81	sha256_base_do_finalize(desc,
	82	(sha256_block_fn *)sha2_ce_transform);
6ba6c74d	83	kernel_neon_end();
03802f6a	84	return sha256_base_finish(desc, out);
6ba6c74d AB	85	}
6ba6c74d AB	86
03802f6a	87	static int sha256_ce_final(struct shash_desc desc, u8 out)
6ba6c74d	88	{
ec59a65d AB	89	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
ec59a65d AB	90
e52b7023	91	if (!crypto_simd_usable()) {
da179331 AB	92	sha256_base_do_finalize(desc,
	93	(sha256_block_fn *)sha256_block_data_order);
	94	return sha256_base_finish(desc, out);
	95	}
	96
ec59a65d	97	sctx->finalize = 0;
da179331	98	kernel_neon_begin();
03802f6a AB	99	sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
	100	kernel_neon_end();
	101	return sha256_base_finish(desc, out);
6ba6c74d AB	102	}
	103
	104	static struct shash_alg algs[] = { {
03802f6a AB	105	.init = sha224_base_init,
	106	.update = sha256_ce_update,
	107	.final = sha256_ce_final,
	108	.finup = sha256_ce_finup,
	109	.descsize = sizeof(struct sha256_ce_state),
6ba6c74d	110	.digestsize = SHA224_DIGEST_SIZE,
6ba6c74d AB	111	.base = {
	112	.cra_name = "sha224",
	113	.cra_driver_name = "sha224-ce",
	114	.cra_priority = 200,
6ba6c74d AB	115	.cra_blocksize = SHA256_BLOCK_SIZE,
	116	.cra_module = THIS_MODULE,
	117	}
	118	}, {
03802f6a AB	119	.init = sha256_base_init,
	120	.update = sha256_ce_update,
	121	.final = sha256_ce_final,
	122	.finup = sha256_ce_finup,
	123	.descsize = sizeof(struct sha256_ce_state),
6ba6c74d	124	.digestsize = SHA256_DIGEST_SIZE,
6ba6c74d AB	125	.base = {
	126	.cra_name = "sha256",
	127	.cra_driver_name = "sha256-ce",
	128	.cra_priority = 200,
6ba6c74d AB	129	.cra_blocksize = SHA256_BLOCK_SIZE,
	130	.cra_module = THIS_MODULE,
	131	}
	132	} };
	133
	134	static int __init sha2_ce_mod_init(void)
	135	{
	136	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
	137	}
	138
	139	static void __exit sha2_ce_mod_fini(void)
	140	{
	141	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
	142	}
	143
	144	module_cpu_feature_match(SHA2, sha2_ce_mod_init);
	145	module_exit(sha2_ce_mod_fini);