[thirdparty/kernel/linux.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/sha2.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");
MODULE_ALIAS_CRYPTO("sha224");
MODULE_ALIAS_CRYPTO("sha256");

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

extern const u32 sha256_ce_offsetof_count;
extern const u32 sha256_ce_offsetof_finalize;

asmlinkage int __sha256_ce_transform(struct sha256_ce_state *sst, u8 const *src,
				     int blocks);

static void sha256_ce_transform(struct sha256_state *sst, u8 const *src,
				int blocks)
{
	while (blocks) {
		int rem;

		kernel_neon_begin();
		rem = __sha256_ce_transform(container_of(sst,
							 struct sha256_ce_state,
							 sst), src, blocks);
		kernel_neon_end();
		src += (blocks - rem) * SHA256_BLOCK_SIZE;
		blocks = rem;
	}
}

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 void sha256_arm64_transform(struct sha256_state *sst, u8 const *src,
				   int blocks)
{
	sha256_block_data_order(sst->state, src, 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_arm64_transform);

	sctx->finalize = 0;
	sha256_base_do_update(desc, data, len, sha256_ce_transform);

	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_arm64_transform);
		sha256_base_do_finalize(desc, sha256_arm64_transform);
		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;

	sha256_base_do_update(desc, data, len, sha256_ce_transform);
	if (!finalize)
		sha256_base_do_finalize(desc, sha256_ce_transform);
	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_arm64_transform);
		return sha256_base_finish(desc, out);
	}

	sctx->finalize = 0;
	sha256_base_do_finalize(desc, sha256_ce_transform);
	return sha256_base_finish(desc, out);
}

static int sha256_ce_digest(struct shash_desc *desc, const u8 *data,
			    unsigned int len, u8 *out)
{
	sha256_base_init(desc);
	return sha256_ce_finup(desc, data, len, out);
}

static int sha256_ce_export(struct shash_desc *desc, void *out)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	memcpy(out, &sctx->sst, sizeof(struct sha256_state));
	return 0;
}

static int sha256_ce_import(struct shash_desc *desc, const void *in)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	memcpy(&sctx->sst, in, sizeof(struct sha256_state));
	sctx->finalize = 0;
	return 0;
}

static struct shash_alg algs[] = { {
	.init			= sha224_base_init,
	.update			= sha256_ce_update,
	.final			= sha256_ce_final,
	.finup			= sha256_ce_finup,
	.export			= sha256_ce_export,
	.import			= sha256_ce_import,
	.descsize		= sizeof(struct sha256_ce_state),
	.statesize		= sizeof(struct sha256_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,
	.digest			= sha256_ce_digest,
	.export			= sha256_ce_export,
	.import			= sha256_ce_import,
	.descsize		= sizeof(struct sha256_ce_state),
	.statesize		= sizeof(struct sha256_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>
a24d22b2	13	#include <crypto/sha2.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");
0df07d81 AB	22	MODULE_ALIAS_CRYPTO("sha224");
0df07d81 AB	23	MODULE_ALIAS_CRYPTO("sha256");
6ba6c74d	24
03802f6a AB	25	struct sha256_ce_state {
	26	struct sha256_state sst;
	27	u32 finalize;
	28	};
6ba6c74d	29
0f4128dc HX	30	extern const u32 sha256_ce_offsetof_count;
	31	extern const u32 sha256_ce_offsetof_finalize;
	32
ba30d311 EB	33	asmlinkage int __sha256_ce_transform(struct sha256_ce_state sst, u8 const src,
ba30d311 EB	34	int blocks);
6ba6c74d	35
ba30d311	36	static void sha256_ce_transform(struct sha256_state sst, u8 const src,
6320a15e ST	37	int blocks)
6320a15e ST	38	{
b2eadbf4 AB	39	while (blocks) {
	40	int rem;
	41
	42	kernel_neon_begin();
ba30d311 EB	43	rem = __sha256_ce_transform(container_of(sst,
	44	struct sha256_ce_state,
	45	sst), src, blocks);
b2eadbf4 AB	46	kernel_neon_end();
	47	src += (blocks - rem) * SHA256_BLOCK_SIZE;
	48	blocks = rem;
	49	}
6320a15e ST	50	}
6320a15e ST	51
f4857f4c AB	52	const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
	53	sst.count);
	54	const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
	55	finalize);
	56
da179331 AB	57	asmlinkage void sha256_block_data_order(u32 digest, u8 const src, int blocks);
da179331 AB	58
ba30d311 EB	59	static void sha256_arm64_transform(struct sha256_state sst, u8 const src,
ba30d311 EB	60	int blocks)
6320a15e ST	61	{
	62	sha256_block_data_order(sst->state, src, blocks);
	63	}
	64
03802f6a AB	65	static int sha256_ce_update(struct shash_desc desc, const u8 data,
03802f6a AB	66	unsigned int len)
6ba6c74d	67	{
03802f6a	68	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
6ba6c74d	69
e52b7023	70	if (!crypto_simd_usable())
da179331	71	return sha256_base_do_update(desc, data, len,
ba30d311	72	sha256_arm64_transform);
da179331	73
03802f6a	74	sctx->finalize = 0;
ba30d311	75	sha256_base_do_update(desc, data, len, sha256_ce_transform);
6ba6c74d	76
6ba6c74d AB	77	return 0;
	78	}
	79
03802f6a AB	80	static int sha256_ce_finup(struct shash_desc desc, const u8 data,
03802f6a AB	81	unsigned int len, u8 *out)
6ba6c74d	82	{
03802f6a	83	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
6bd934de	84	bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
6ba6c74d	85
e52b7023	86	if (!crypto_simd_usable()) {
da179331 AB	87	if (len)
da179331 AB	88	sha256_base_do_update(desc, data, len,
ba30d311 EB	89	sha256_arm64_transform);
ba30d311 EB	90	sha256_base_do_finalize(desc, sha256_arm64_transform);
da179331 AB	91	return sha256_base_finish(desc, out);
	92	}
	93
6ba6c74d	94	/*
03802f6a AB	95	* Allow the asm code to perform the finalization if there is no
03802f6a AB	96	* partial data and the input is a round multiple of the block size.
6ba6c74d	97	*/
03802f6a	98	sctx->finalize = finalize;
6ba6c74d	99
ba30d311	100	sha256_base_do_update(desc, data, len, sha256_ce_transform);
03802f6a	101	if (!finalize)
ba30d311	102	sha256_base_do_finalize(desc, sha256_ce_transform);
03802f6a	103	return sha256_base_finish(desc, out);
6ba6c74d AB	104	}
6ba6c74d AB	105
03802f6a	106	static int sha256_ce_final(struct shash_desc desc, u8 out)
6ba6c74d	107	{
ec59a65d AB	108	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
ec59a65d AB	109
e52b7023	110	if (!crypto_simd_usable()) {
ba30d311	111	sha256_base_do_finalize(desc, sha256_arm64_transform);
da179331 AB	112	return sha256_base_finish(desc, out);
	113	}
	114
ec59a65d	115	sctx->finalize = 0;
ba30d311	116	sha256_base_do_finalize(desc, sha256_ce_transform);
03802f6a	117	return sha256_base_finish(desc, out);
6ba6c74d AB	118	}
6ba6c74d AB	119
1efcbf0e EB	120	static int sha256_ce_digest(struct shash_desc desc, const u8 data,
	121	unsigned int len, u8 *out)
	122	{
	123	sha256_base_init(desc);
	124	return sha256_ce_finup(desc, data, len, out);
	125	}
	126
d282eeeb CL	127	static int sha256_ce_export(struct shash_desc desc, void out)
	128	{
	129	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
	130
	131	memcpy(out, &sctx->sst, sizeof(struct sha256_state));
	132	return 0;
	133	}
	134
	135	static int sha256_ce_import(struct shash_desc desc, const void in)
	136	{
	137	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
	138
	139	memcpy(&sctx->sst, in, sizeof(struct sha256_state));
	140	sctx->finalize = 0;
	141	return 0;
	142	}
	143
6ba6c74d	144	static struct shash_alg algs[] = { {
03802f6a AB	145	.init = sha224_base_init,
	146	.update = sha256_ce_update,
	147	.final = sha256_ce_final,
	148	.finup = sha256_ce_finup,
d282eeeb CL	149	.export = sha256_ce_export,
d282eeeb CL	150	.import = sha256_ce_import,
03802f6a	151	.descsize = sizeof(struct sha256_ce_state),
d282eeeb	152	.statesize = sizeof(struct sha256_state),
6ba6c74d	153	.digestsize = SHA224_DIGEST_SIZE,
6ba6c74d AB	154	.base = {
	155	.cra_name = "sha224",
	156	.cra_driver_name = "sha224-ce",
	157	.cra_priority = 200,
6ba6c74d AB	158	.cra_blocksize = SHA256_BLOCK_SIZE,
	159	.cra_module = THIS_MODULE,
	160	}
	161	}, {
03802f6a AB	162	.init = sha256_base_init,
	163	.update = sha256_ce_update,
	164	.final = sha256_ce_final,
	165	.finup = sha256_ce_finup,
1efcbf0e	166	.digest = sha256_ce_digest,
d282eeeb CL	167	.export = sha256_ce_export,
d282eeeb CL	168	.import = sha256_ce_import,
03802f6a	169	.descsize = sizeof(struct sha256_ce_state),
d282eeeb	170	.statesize = sizeof(struct sha256_state),
6ba6c74d	171	.digestsize = SHA256_DIGEST_SIZE,
6ba6c74d AB	172	.base = {
	173	.cra_name = "sha256",
	174	.cra_driver_name = "sha256-ce",
	175	.cra_priority = 200,
6ba6c74d AB	176	.cra_blocksize = SHA256_BLOCK_SIZE,
	177	.cra_module = THIS_MODULE,
	178	}
	179	} };
	180
	181	static int __init sha2_ce_mod_init(void)
	182	{
	183	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
	184	}
	185
	186	static void __exit sha2_ce_mod_fini(void)
	187	{
	188	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
	189	}
	190
	191	module_cpu_feature_match(SHA2, sha2_ce_mod_init);
	192	module_exit(sha2_ce_mod_fini);