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
 12struct xxhash64_tfm_ctx {
 13	u64 seed;
 14};
 15
 16struct xxhash64_desc_ctx {
 17	struct xxh64_state xxhstate;
 18};
 19
 20static 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
 25	if (keylen != sizeof(tctx->seed))
 26		return -EINVAL;
 27	tctx->seed = get_unaligned_le64(key);
 28	return 0;
 29}
 30
 31static 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
 41static 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
 51static 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
 60static 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
 70static 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
 89static int __init xxhash_mod_init(void)
 90{
 91	return crypto_register_shash(&alg);
 92}
 93
 94static void __exit xxhash_mod_fini(void)
 95{
 96	crypto_unregister_shash(&alg);
 97}
 98
 99subsys_initcall(xxhash_mod_init);
100module_exit(xxhash_mod_fini);
101
102MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>");
103MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
104MODULE_LICENSE("GPL");
105MODULE_ALIAS_CRYPTO("xxhash64");
106MODULE_ALIAS_CRYPTO("xxhash64-generic");