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

static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src,
				int blocks)
{
	while (blocks) {
		int rem;

		kernel_neon_begin();
		rem = sha2_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_block_data_order(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_block_data_order);

	sctx->finalize = 0;
	sha256_base_do_update(desc, data, len, __sha2_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_block_data_order);
		sha256_base_do_finalize(desc, __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;

	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
	if (!finalize)
		sha256_base_do_finalize(desc, __sha2_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_block_data_order);
		return sha256_base_finish(desc, out);
	}

	sctx->finalize = 0;
	sha256_base_do_finalize(desc, __sha2_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
b2eadbf4 AB	33	asmlinkage int sha2_ce_transform(struct sha256_ce_state sst, u8 const src,
b2eadbf4 AB	34	int blocks);
6ba6c74d	35
6320a15e ST	36	static void __sha2_ce_transform(struct sha256_state sst, u8 const src,
	37	int blocks)
	38	{
b2eadbf4 AB	39	while (blocks) {
	40	int rem;
	41
	42	kernel_neon_begin();
	43	rem = sha2_ce_transform(container_of(sst, struct sha256_ce_state,
	44	sst), src, blocks);
	45	kernel_neon_end();
	46	src += (blocks - rem) * SHA256_BLOCK_SIZE;
	47	blocks = rem;
	48	}
6320a15e ST	49	}
6320a15e ST	50
f4857f4c AB	51	const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
	52	sst.count);
	53	const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
	54	finalize);
	55
da179331 AB	56	asmlinkage void sha256_block_data_order(u32 digest, u8 const src, int blocks);
da179331 AB	57
6320a15e ST	58	static void __sha256_block_data_order(struct sha256_state sst, u8 const src,
	59	int blocks)
	60	{
	61	sha256_block_data_order(sst->state, src, blocks);
	62	}
	63
03802f6a AB	64	static int sha256_ce_update(struct shash_desc desc, const u8 data,
03802f6a AB	65	unsigned int len)
6ba6c74d	66	{
03802f6a	67	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
6ba6c74d	68
e52b7023	69	if (!crypto_simd_usable())
da179331	70	return sha256_base_do_update(desc, data, len,
6320a15e	71	__sha256_block_data_order);
da179331	72
03802f6a	73	sctx->finalize = 0;
6320a15e	74	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
6ba6c74d	75
6ba6c74d AB	76	return 0;
	77	}
	78
03802f6a AB	79	static int sha256_ce_finup(struct shash_desc desc, const u8 data,
03802f6a AB	80	unsigned int len, u8 *out)
6ba6c74d	81	{
03802f6a	82	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
6bd934de	83	bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
6ba6c74d	84
e52b7023	85	if (!crypto_simd_usable()) {
da179331 AB	86	if (len)
da179331 AB	87	sha256_base_do_update(desc, data, len,
6320a15e ST	88	__sha256_block_data_order);
6320a15e ST	89	sha256_base_do_finalize(desc, __sha256_block_data_order);
da179331 AB	90	return sha256_base_finish(desc, out);
	91	}
	92
6ba6c74d	93	/*
03802f6a AB	94	* Allow the asm code to perform the finalization if there is no
03802f6a AB	95	* partial data and the input is a round multiple of the block size.
6ba6c74d	96	*/
03802f6a	97	sctx->finalize = finalize;
6ba6c74d	98
6320a15e	99	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
03802f6a	100	if (!finalize)
6320a15e	101	sha256_base_do_finalize(desc, __sha2_ce_transform);
03802f6a	102	return sha256_base_finish(desc, out);
6ba6c74d AB	103	}
6ba6c74d AB	104
03802f6a	105	static int sha256_ce_final(struct shash_desc desc, u8 out)
6ba6c74d	106	{
ec59a65d AB	107	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
ec59a65d AB	108
e52b7023	109	if (!crypto_simd_usable()) {
6320a15e	110	sha256_base_do_finalize(desc, __sha256_block_data_order);
da179331 AB	111	return sha256_base_finish(desc, out);
	112	}
	113
ec59a65d	114	sctx->finalize = 0;
6320a15e	115	sha256_base_do_finalize(desc, __sha2_ce_transform);
03802f6a	116	return sha256_base_finish(desc, out);
6ba6c74d AB	117	}
6ba6c74d AB	118
1efcbf0e EB	119	static int sha256_ce_digest(struct shash_desc desc, const u8 data,
	120	unsigned int len, u8 *out)
	121	{
	122	sha256_base_init(desc);
	123	return sha256_ce_finup(desc, data, len, out);
	124	}
	125
d282eeeb CL	126	static int sha256_ce_export(struct shash_desc desc, void out)
	127	{
	128	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
	129
	130	memcpy(out, &sctx->sst, sizeof(struct sha256_state));
	131	return 0;
	132	}
	133
	134	static int sha256_ce_import(struct shash_desc desc, const void in)
	135	{
	136	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
	137
	138	memcpy(&sctx->sst, in, sizeof(struct sha256_state));
	139	sctx->finalize = 0;
	140	return 0;
	141	}
	142
6ba6c74d	143	static struct shash_alg algs[] = { {
03802f6a AB	144	.init = sha224_base_init,
	145	.update = sha256_ce_update,
	146	.final = sha256_ce_final,
	147	.finup = sha256_ce_finup,
d282eeeb CL	148	.export = sha256_ce_export,
d282eeeb CL	149	.import = sha256_ce_import,
03802f6a	150	.descsize = sizeof(struct sha256_ce_state),
d282eeeb	151	.statesize = sizeof(struct sha256_state),
6ba6c74d	152	.digestsize = SHA224_DIGEST_SIZE,
6ba6c74d AB	153	.base = {
	154	.cra_name = "sha224",
	155	.cra_driver_name = "sha224-ce",
	156	.cra_priority = 200,
6ba6c74d AB	157	.cra_blocksize = SHA256_BLOCK_SIZE,
	158	.cra_module = THIS_MODULE,
	159	}
	160	}, {
03802f6a AB	161	.init = sha256_base_init,
	162	.update = sha256_ce_update,
	163	.final = sha256_ce_final,
	164	.finup = sha256_ce_finup,
1efcbf0e	165	.digest = sha256_ce_digest,
d282eeeb CL	166	.export = sha256_ce_export,
d282eeeb CL	167	.import = sha256_ce_import,
03802f6a	168	.descsize = sizeof(struct sha256_ce_state),
d282eeeb	169	.statesize = sizeof(struct sha256_state),
6ba6c74d	170	.digestsize = SHA256_DIGEST_SIZE,
6ba6c74d AB	171	.base = {
	172	.cra_name = "sha256",
	173	.cra_driver_name = "sha256-ce",
	174	.cra_priority = 200,
6ba6c74d AB	175	.cra_blocksize = SHA256_BLOCK_SIZE,
	176	.cra_module = THIS_MODULE,
	177	}
	178	} };
	179
	180	static int __init sha2_ce_mod_init(void)
	181	{
	182	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
	183	}
	184
	185	static void __exit sha2_ce_mod_fini(void)
	186	{
	187	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
	188	}
	189
	190	module_cpu_feature_match(SHA2, sha2_ce_mod_init);
	191	module_exit(sha2_ce_mod_fini);