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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 | ||
25 | if (keylen != sizeof(tctx->seed)) { | |
26 | crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
27 | return -EINVAL; | |
28 | } | |
29 | tctx->seed = get_unaligned_le64(key); | |
30 | return 0; | |
31 | } | |
32 | ||
33 | static int xxhash64_init(struct shash_desc *desc) | |
34 | { | |
35 | struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); | |
36 | struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc); | |
37 | ||
38 | xxh64_reset(&dctx->xxhstate, tctx->seed); | |
39 | ||
40 | return 0; | |
41 | } | |
42 | ||
43 | static int xxhash64_update(struct shash_desc *desc, const u8 *data, | |
44 | unsigned int length) | |
45 | { | |
46 | struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc); | |
47 | ||
48 | xxh64_update(&dctx->xxhstate, data, length); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int xxhash64_final(struct shash_desc *desc, u8 *out) | |
54 | { | |
55 | struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc); | |
56 | ||
57 | put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static int xxhash64_digest(struct shash_desc *desc, const u8 *data, | |
63 | unsigned int length, u8 *out) | |
64 | { | |
65 | struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); | |
66 | ||
67 | put_unaligned_le64(xxh64(data, length, tctx->seed), out); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static struct shash_alg alg = { | |
73 | .digestsize = XXHASH64_DIGEST_SIZE, | |
74 | .setkey = xxhash64_setkey, | |
75 | .init = xxhash64_init, | |
76 | .update = xxhash64_update, | |
77 | .final = xxhash64_final, | |
78 | .digest = xxhash64_digest, | |
79 | .descsize = sizeof(struct xxhash64_desc_ctx), | |
80 | .base = { | |
81 | .cra_name = "xxhash64", | |
82 | .cra_driver_name = "xxhash64-generic", | |
83 | .cra_priority = 100, | |
84 | .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, | |
85 | .cra_blocksize = XXHASH64_BLOCK_SIZE, | |
86 | .cra_ctxsize = sizeof(struct xxhash64_tfm_ctx), | |
87 | .cra_module = THIS_MODULE, | |
88 | } | |
89 | }; | |
90 | ||
91 | static int __init xxhash_mod_init(void) | |
92 | { | |
93 | return crypto_register_shash(&alg); | |
94 | } | |
95 | ||
96 | static void __exit xxhash_mod_fini(void) | |
97 | { | |
98 | crypto_unregister_shash(&alg); | |
99 | } | |
100 | ||
101 | subsys_initcall(xxhash_mod_init); | |
102 | module_exit(xxhash_mod_fini); | |
103 | ||
104 | MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>"); | |
105 | MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c"); | |
106 | MODULE_LICENSE("GPL"); | |
107 | MODULE_ALIAS_CRYPTO("xxhash64"); | |
108 | MODULE_ALIAS_CRYPTO("xxhash64-generic"); |