1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/crc64.h>
4#include <linux/module.h>
5#include <crypto/internal/hash.h>
6#include <asm/unaligned.h>
7
8static int chksum_init(struct shash_desc *desc)
9{
10 u64 *crc = shash_desc_ctx(desc);
11
12 *crc = 0;
13
14 return 0;
15}
16
17static int chksum_update(struct shash_desc *desc, const u8 *data,
18 unsigned int length)
19{
20 u64 *crc = shash_desc_ctx(desc);
21
22 *crc = crc64_rocksoft_generic(crc: *crc, p: data, len: length);
23
24 return 0;
25}
26
27static int chksum_final(struct shash_desc *desc, u8 *out)
28{
29 u64 *crc = shash_desc_ctx(desc);
30
31 put_unaligned_le64(val: *crc, p: out);
32 return 0;
33}
34
35static int __chksum_finup(u64 crc, const u8 *data, unsigned int len, u8 *out)
36{
37 crc = crc64_rocksoft_generic(crc, p: data, len);
38 put_unaligned_le64(val: crc, p: out);
39 return 0;
40}
41
42static int chksum_finup(struct shash_desc *desc, const u8 *data,
43 unsigned int len, u8 *out)
44{
45 u64 *crc = shash_desc_ctx(desc);
46
47 return __chksum_finup(crc: *crc, data, len, out);
48}
49
50static int chksum_digest(struct shash_desc *desc, const u8 *data,
51 unsigned int length, u8 *out)
52{
53 return __chksum_finup(crc: 0, data, len: length, out);
54}
55
56static struct shash_alg alg = {
57 .digestsize = sizeof(u64),
58 .init = chksum_init,
59 .update = chksum_update,
60 .final = chksum_final,
61 .finup = chksum_finup,
62 .digest = chksum_digest,
63 .descsize = sizeof(u64),
64 .base = {
65 .cra_name = CRC64_ROCKSOFT_STRING,
66 .cra_driver_name = "crc64-rocksoft-generic",
67 .cra_priority = 200,
68 .cra_blocksize = 1,
69 .cra_module = THIS_MODULE,
70 }
71};
72
73static int __init crc64_rocksoft_init(void)
74{
75 return crypto_register_shash(alg: &alg);
76}
77
78static void __exit crc64_rocksoft_exit(void)
79{
80 crypto_unregister_shash(alg: &alg);
81}
82
83module_init(crc64_rocksoft_init);
84module_exit(crc64_rocksoft_exit);
85
86MODULE_LICENSE("GPL");
87MODULE_DESCRIPTION("Rocksoft model CRC64 calculation.");
88MODULE_ALIAS_CRYPTO("crc64-rocksoft");
89MODULE_ALIAS_CRYPTO("crc64-rocksoft-generic");
90

source code of linux/crypto/crc64_rocksoft_generic.c