[linux.git] / crypto / xxhash_generic.c

// SPDX-License-Identifier: GPL-2.0

#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/xxhash.h>
#include <asm/unaligned.h>

#define XXHASH64_BLOCK_SIZE	32
#define XXHASH64_DIGEST_SIZE	8

struct xxhash64_tfm_ctx {
	u64 seed;
};

struct xxhash64_desc_ctx {
	struct xxh64_state xxhstate;
};

static int xxhash64_setkey(struct crypto_shash *tfm, const u8 *key,
			 unsigned int keylen)
{
	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm);

	if (keylen != sizeof(tctx->seed))
		return -EINVAL;
	tctx->seed = get_unaligned_le64(key);
	return 0;
}

static int xxhash64_init(struct shash_desc *desc)
{
	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);

	xxh64_reset(&dctx->xxhstate, tctx->seed);

	return 0;
}

static int xxhash64_update(struct shash_desc *desc, const u8 *data,
			 unsigned int length)
{
	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);

	xxh64_update(&dctx->xxhstate, data, length);

	return 0;
}

static int xxhash64_final(struct shash_desc *desc, u8 *out)
{
	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);

	put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out);

	return 0;
}

static int xxhash64_digest(struct shash_desc *desc, const u8 *data,
			 unsigned int length, u8 *out)
{
	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);

	put_unaligned_le64(xxh64(data, length, tctx->seed), out);

	return 0;
}

static struct shash_alg alg = {
	.digestsize	= XXHASH64_DIGEST_SIZE,
	.setkey		= xxhash64_setkey,
	.init		= xxhash64_init,
	.update		= xxhash64_update,
	.final		= xxhash64_final,
	.digest		= xxhash64_digest,
	.descsize	= sizeof(struct xxhash64_desc_ctx),
	.base		= {
		.cra_name	 = "xxhash64",
		.cra_driver_name = "xxhash64-generic",
		.cra_priority	 = 100,
		.cra_flags	 = CRYPTO_ALG_OPTIONAL_KEY,
		.cra_blocksize	 = XXHASH64_BLOCK_SIZE,
		.cra_ctxsize	 = sizeof(struct xxhash64_tfm_ctx),
		.cra_module	 = THIS_MODULE,
	}
};

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

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

subsys_initcall(xxhash_mod_init);
module_exit(xxhash_mod_fini);

MODULE_AUTHOR("Nikolay Borisov <[email protected]>");
MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("xxhash64");
MODULE_ALIAS_CRYPTO("xxhash64-generic");
Commit	Line	Data
67882e76 NB	1	// SPDX-License-Identifier: GPL-2.0
	2
	3	#include <crypto/internal/hash.h>
	4	#include <linux/init.h>
	5	#include <linux/module.h>
	6	#include <linux/xxhash.h>
	7	#include <asm/unaligned.h>
	8
	9	#define XXHASH64_BLOCK_SIZE 32
	10	#define XXHASH64_DIGEST_SIZE 8
	11
	12	struct xxhash64_tfm_ctx {
	13	u64 seed;
	14	};
	15
	16	struct xxhash64_desc_ctx {
	17	struct xxh64_state xxhstate;
	18	};
	19
	20	static int xxhash64_setkey(struct crypto_shash tfm, const u8 key,
	21	unsigned int keylen)
	22	{
	23	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm);
	24
674f368a	25	if (keylen != sizeof(tctx->seed))
67882e76	26	return -EINVAL;
67882e76 NB	27	tctx->seed = get_unaligned_le64(key);
	28	return 0;
	29	}
	30
	31	static int xxhash64_init(struct shash_desc *desc)
	32	{
	33	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	34	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
	35
	36	xxh64_reset(&dctx->xxhstate, tctx->seed);
	37
	38	return 0;
	39	}
	40
	41	static int xxhash64_update(struct shash_desc desc, const u8 data,
	42	unsigned int length)
	43	{
	44	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
	45
	46	xxh64_update(&dctx->xxhstate, data, length);
	47
	48	return 0;
	49	}
	50
	51	static int xxhash64_final(struct shash_desc desc, u8 out)
	52	{
	53	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
	54
	55	put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out);
	56
	57	return 0;
	58	}
	59
	60	static int xxhash64_digest(struct shash_desc desc, const u8 data,
	61	unsigned int length, u8 *out)
	62	{
	63	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	64
	65	put_unaligned_le64(xxh64(data, length, tctx->seed), out);
	66
	67	return 0;
	68	}
	69
	70	static struct shash_alg alg = {
	71	.digestsize = XXHASH64_DIGEST_SIZE,
	72	.setkey = xxhash64_setkey,
	73	.init = xxhash64_init,
	74	.update = xxhash64_update,
	75	.final = xxhash64_final,
	76	.digest = xxhash64_digest,
	77	.descsize = sizeof(struct xxhash64_desc_ctx),
	78	.base = {
	79	.cra_name = "xxhash64",
	80	.cra_driver_name = "xxhash64-generic",
	81	.cra_priority = 100,
	82	.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
	83	.cra_blocksize = XXHASH64_BLOCK_SIZE,
	84	.cra_ctxsize = sizeof(struct xxhash64_tfm_ctx),
	85	.cra_module = THIS_MODULE,
	86	}
	87	};
	88
	89	static int __init xxhash_mod_init(void)
	90	{
91	return crypto_register_shash(&alg);
92	}
93
94	static void __exit xxhash_mod_fini(void)
95	{
96	crypto_unregister_shash(&alg);
97	}
98
99	subsys_initcall(xxhash_mod_init);
100	module_exit(xxhash_mod_fini);
101
102	MODULE_AUTHOR("Nikolay Borisov <[email protected]>");
103	MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
104	MODULE_LICENSE("GPL");
105	MODULE_ALIAS_CRYPTO("xxhash64");
106	MODULE_ALIAS_CRYPTO("xxhash64-generic");