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 
8 static 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 
17 static 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 
27 static 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 
35 static 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 
42 static 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 
50 static 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 
56 static 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 
73 static int __init crc64_rocksoft_init(void)
74 {
75 	return crypto_register_shash(&alg);
76 }
77 
78 static void __exit crc64_rocksoft_exit(void)
79 {
80 	crypto_unregister_shash(&alg);
81 }
82 
83 module_init(crc64_rocksoft_init);
84 module_exit(crc64_rocksoft_exit);
85 
86 MODULE_LICENSE("GPL");
87 MODULE_DESCRIPTION("Rocksoft model CRC64 calculation.");
88 MODULE_ALIAS_CRYPTO("crc64-rocksoft");
89 MODULE_ALIAS_CRYPTO("crc64-rocksoft-generic");
90