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
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