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 return -EINVAL;
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 <nborisov@suse.com>");
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");
107
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