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, data, 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(*crc, 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, data, len);
38	put_unaligned_le64(crc, 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, 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(0, data, 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);
76}
77
78static void __exit crc64_rocksoft_exit(void)
79{
80	crypto_unregister_shash(&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