scsi: target: core: Get rid of warning in compare_and_write_do_cmp()
[linux-2.6-microblaze.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                 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");