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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2012 Xyratex Technology Limited
4 */
5
6/*
7 * This is crypto api shash wrappers to crc32_le.
8 */
9
10#include <asm/unaligned.h>
11#include <linux/crc32.h>
12#include <crypto/internal/hash.h>
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/string.h>
16#include <linux/kernel.h>
17
18#define CHKSUM_BLOCK_SIZE 1
19#define CHKSUM_DIGEST_SIZE 4
20
21/** No default init with ~0 */
22static int crc32_cra_init(struct crypto_tfm *tfm)
23{
24 u32 *key = crypto_tfm_ctx(tfm);
25
26 *key = 0;
27
28 return 0;
29}
30
31/*
32 * Setting the seed allows arbitrary accumulators and flexible XOR policy
33 * If your algorithm starts with ~0, then XOR with ~0 before you set
34 * the seed.
35 */
36static int crc32_setkey(struct crypto_shash *hash, const u8 *key,
37 unsigned int keylen)
38{
39 u32 *mctx = crypto_shash_ctx(hash);
40
41 if (keylen != sizeof(u32))
42 return -EINVAL;
43 *mctx = get_unaligned_le32(key);
44 return 0;
45}
46
47static int crc32_init(struct shash_desc *desc)
48{
49 u32 *mctx = crypto_shash_ctx(desc->tfm);
50 u32 *crcp = shash_desc_ctx(desc);
51
52 *crcp = *mctx;
53
54 return 0;
55}
56
57static int crc32_update(struct shash_desc *desc, const u8 *data,
58 unsigned int len)
59{
60 u32 *crcp = shash_desc_ctx(desc);
61
62 *crcp = crc32_le(*crcp, data, len);
63 return 0;
64}
65
66/* No final XOR 0xFFFFFFFF, like crc32_le */
67static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len,
68 u8 *out)
69{
70 put_unaligned_le32(crc32_le(*crcp, data, len), out);
71 return 0;
72}
73
74static int crc32_finup(struct shash_desc *desc, const u8 *data,
75 unsigned int len, u8 *out)
76{
77 return __crc32_finup(shash_desc_ctx(desc), data, len, out);
78}
79
80static int crc32_final(struct shash_desc *desc, u8 *out)
81{
82 u32 *crcp = shash_desc_ctx(desc);
83
84 put_unaligned_le32(*crcp, out);
85 return 0;
86}
87
88static int crc32_digest(struct shash_desc *desc, const u8 *data,
89 unsigned int len, u8 *out)
90{
91 return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len,
92 out);
93}
94static struct shash_alg alg = {
95 .setkey = crc32_setkey,
96 .init = crc32_init,
97 .update = crc32_update,
98 .final = crc32_final,
99 .finup = crc32_finup,
100 .digest = crc32_digest,
101 .descsize = sizeof(u32),
102 .digestsize = CHKSUM_DIGEST_SIZE,
103 .base = {
104 .cra_name = "crc32",
105 .cra_driver_name = "crc32-generic",
106 .cra_priority = 100,
107 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
108 .cra_blocksize = CHKSUM_BLOCK_SIZE,
109 .cra_ctxsize = sizeof(u32),
110 .cra_module = THIS_MODULE,
111 .cra_init = crc32_cra_init,
112 }
113};
114
115static int __init crc32_mod_init(void)
116{
117 return crypto_register_shash(&alg);
118}
119
120static void __exit crc32_mod_fini(void)
121{
122 crypto_unregister_shash(&alg);
123}
124
125subsys_initcall(crc32_mod_init);
126module_exit(crc32_mod_fini);
127
128MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>");
129MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32");
130MODULE_LICENSE("GPL");
131MODULE_ALIAS_CRYPTO("crc32");
132MODULE_ALIAS_CRYPTO("crc32-generic");
1/* GPL HEADER START
2 *
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License version 2 for more details (a copy is included
13 * in the LICENSE file that accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License
16 * version 2 along with this program; If not, see http://www.gnu.org/licenses
17 *
18 * Please visit http://www.xyratex.com/contact if you need additional
19 * information or have any questions.
20 *
21 * GPL HEADER END
22 */
23
24/*
25 * Copyright 2012 Xyratex Technology Limited
26 */
27
28/*
29 * This is crypto api shash wrappers to crc32_le.
30 */
31
32#include <asm/unaligned.h>
33#include <linux/crc32.h>
34#include <crypto/internal/hash.h>
35#include <linux/init.h>
36#include <linux/module.h>
37#include <linux/string.h>
38#include <linux/kernel.h>
39
40#define CHKSUM_BLOCK_SIZE 1
41#define CHKSUM_DIGEST_SIZE 4
42
43/** No default init with ~0 */
44static int crc32_cra_init(struct crypto_tfm *tfm)
45{
46 u32 *key = crypto_tfm_ctx(tfm);
47
48 *key = 0;
49
50 return 0;
51}
52
53/*
54 * Setting the seed allows arbitrary accumulators and flexible XOR policy
55 * If your algorithm starts with ~0, then XOR with ~0 before you set
56 * the seed.
57 */
58static int crc32_setkey(struct crypto_shash *hash, const u8 *key,
59 unsigned int keylen)
60{
61 u32 *mctx = crypto_shash_ctx(hash);
62
63 if (keylen != sizeof(u32))
64 return -EINVAL;
65 *mctx = get_unaligned_le32(key);
66 return 0;
67}
68
69static int crc32_init(struct shash_desc *desc)
70{
71 u32 *mctx = crypto_shash_ctx(desc->tfm);
72 u32 *crcp = shash_desc_ctx(desc);
73
74 *crcp = *mctx;
75
76 return 0;
77}
78
79static int crc32_update(struct shash_desc *desc, const u8 *data,
80 unsigned int len)
81{
82 u32 *crcp = shash_desc_ctx(desc);
83
84 *crcp = crc32_le(*crcp, data, len);
85 return 0;
86}
87
88/* No final XOR 0xFFFFFFFF, like crc32_le */
89static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len,
90 u8 *out)
91{
92 put_unaligned_le32(crc32_le(*crcp, data, len), out);
93 return 0;
94}
95
96static int crc32_finup(struct shash_desc *desc, const u8 *data,
97 unsigned int len, u8 *out)
98{
99 return __crc32_finup(shash_desc_ctx(desc), data, len, out);
100}
101
102static int crc32_final(struct shash_desc *desc, u8 *out)
103{
104 u32 *crcp = shash_desc_ctx(desc);
105
106 put_unaligned_le32(*crcp, out);
107 return 0;
108}
109
110static int crc32_digest(struct shash_desc *desc, const u8 *data,
111 unsigned int len, u8 *out)
112{
113 return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len,
114 out);
115}
116static struct shash_alg alg = {
117 .setkey = crc32_setkey,
118 .init = crc32_init,
119 .update = crc32_update,
120 .final = crc32_final,
121 .finup = crc32_finup,
122 .digest = crc32_digest,
123 .descsize = sizeof(u32),
124 .digestsize = CHKSUM_DIGEST_SIZE,
125 .base = {
126 .cra_name = "crc32",
127 .cra_driver_name = "crc32-generic",
128 .cra_priority = 100,
129 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
130 .cra_blocksize = CHKSUM_BLOCK_SIZE,
131 .cra_ctxsize = sizeof(u32),
132 .cra_module = THIS_MODULE,
133 .cra_init = crc32_cra_init,
134 }
135};
136
137static int __init crc32_mod_init(void)
138{
139 return crypto_register_shash(&alg);
140}
141
142static void __exit crc32_mod_fini(void)
143{
144 crypto_unregister_shash(&alg);
145}
146
147subsys_initcall(crc32_mod_init);
148module_exit(crc32_mod_fini);
149
150MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>");
151MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32");
152MODULE_LICENSE("GPL");
153MODULE_ALIAS_CRYPTO("crc32");
154MODULE_ALIAS_CRYPTO("crc32-generic");