Merge tag 'for-linus-5.3-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubca...
[platform/kernel/linux-rpi.git] / crypto / xxhash_generic.c
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");