1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun #include <crypto/internal/hash.h>
4*4882a593Smuzhiyun #include <linux/init.h>
5*4882a593Smuzhiyun #include <linux/module.h>
6*4882a593Smuzhiyun #include <linux/xxhash.h>
7*4882a593Smuzhiyun #include <asm/unaligned.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #define XXHASH64_BLOCK_SIZE 32
10*4882a593Smuzhiyun #define XXHASH64_DIGEST_SIZE 8
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun struct xxhash64_tfm_ctx {
13*4882a593Smuzhiyun u64 seed;
14*4882a593Smuzhiyun };
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun struct xxhash64_desc_ctx {
17*4882a593Smuzhiyun struct xxh64_state xxhstate;
18*4882a593Smuzhiyun };
19*4882a593Smuzhiyun
xxhash64_setkey(struct crypto_shash * tfm,const u8 * key,unsigned int keylen)20*4882a593Smuzhiyun static int xxhash64_setkey(struct crypto_shash *tfm, const u8 *key,
21*4882a593Smuzhiyun unsigned int keylen)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun if (keylen != sizeof(tctx->seed))
26*4882a593Smuzhiyun return -EINVAL;
27*4882a593Smuzhiyun tctx->seed = get_unaligned_le64(key);
28*4882a593Smuzhiyun return 0;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
xxhash64_init(struct shash_desc * desc)31*4882a593Smuzhiyun static int xxhash64_init(struct shash_desc *desc)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
34*4882a593Smuzhiyun struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun xxh64_reset(&dctx->xxhstate, tctx->seed);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun return 0;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
xxhash64_update(struct shash_desc * desc,const u8 * data,unsigned int length)41*4882a593Smuzhiyun static int xxhash64_update(struct shash_desc *desc, const u8 *data,
42*4882a593Smuzhiyun unsigned int length)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun xxh64_update(&dctx->xxhstate, data, length);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return 0;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
xxhash64_final(struct shash_desc * desc,u8 * out)51*4882a593Smuzhiyun static int xxhash64_final(struct shash_desc *desc, u8 *out)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun return 0;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
xxhash64_digest(struct shash_desc * desc,const u8 * data,unsigned int length,u8 * out)60*4882a593Smuzhiyun static int xxhash64_digest(struct shash_desc *desc, const u8 *data,
61*4882a593Smuzhiyun unsigned int length, u8 *out)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun put_unaligned_le64(xxh64(data, length, tctx->seed), out);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun static struct shash_alg alg = {
71*4882a593Smuzhiyun .digestsize = XXHASH64_DIGEST_SIZE,
72*4882a593Smuzhiyun .setkey = xxhash64_setkey,
73*4882a593Smuzhiyun .init = xxhash64_init,
74*4882a593Smuzhiyun .update = xxhash64_update,
75*4882a593Smuzhiyun .final = xxhash64_final,
76*4882a593Smuzhiyun .digest = xxhash64_digest,
77*4882a593Smuzhiyun .descsize = sizeof(struct xxhash64_desc_ctx),
78*4882a593Smuzhiyun .base = {
79*4882a593Smuzhiyun .cra_name = "xxhash64",
80*4882a593Smuzhiyun .cra_driver_name = "xxhash64-generic",
81*4882a593Smuzhiyun .cra_priority = 100,
82*4882a593Smuzhiyun .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
83*4882a593Smuzhiyun .cra_blocksize = XXHASH64_BLOCK_SIZE,
84*4882a593Smuzhiyun .cra_ctxsize = sizeof(struct xxhash64_tfm_ctx),
85*4882a593Smuzhiyun .cra_module = THIS_MODULE,
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun };
88*4882a593Smuzhiyun
xxhash_mod_init(void)89*4882a593Smuzhiyun static int __init xxhash_mod_init(void)
90*4882a593Smuzhiyun {
91*4882a593Smuzhiyun return crypto_register_shash(&alg);
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
xxhash_mod_fini(void)94*4882a593Smuzhiyun static void __exit xxhash_mod_fini(void)
95*4882a593Smuzhiyun {
96*4882a593Smuzhiyun crypto_unregister_shash(&alg);
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun subsys_initcall(xxhash_mod_init);
100*4882a593Smuzhiyun module_exit(xxhash_mod_fini);
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>");
103*4882a593Smuzhiyun MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
104*4882a593Smuzhiyun MODULE_LICENSE("GPL");
105*4882a593Smuzhiyun MODULE_ALIAS_CRYPTO("xxhash64");
106*4882a593Smuzhiyun MODULE_ALIAS_CRYPTO("xxhash64-generic");
107