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 */
crc32_cra_init(struct crypto_tfm * tfm)44 static 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 */
crc32_setkey(struct crypto_shash * hash,const u8 * key,unsigned int keylen)58 static 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
crc32_init(struct shash_desc * desc)69 static 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
crc32_update(struct shash_desc * desc,const u8 * data,unsigned int len)79 static 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 */
__crc32_finup(u32 * crcp,const u8 * data,unsigned int len,u8 * out)89 static 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
crc32_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)96 static 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
crc32_final(struct shash_desc * desc,u8 * out)102 static 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
crc32_digest(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)110 static 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 }
116 static 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
crc32_mod_init(void)137 static int __init crc32_mod_init(void)
138 {
139 return crypto_register_shash(&alg);
140 }
141
crc32_mod_fini(void)142 static void __exit crc32_mod_fini(void)
143 {
144 crypto_unregister_shash(&alg);
145 }
146
147 subsys_initcall(crc32_mod_init);
148 module_exit(crc32_mod_fini);
149
150 MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>");
151 MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32");
152 MODULE_LICENSE("GPL");
153 MODULE_ALIAS_CRYPTO("crc32");
154 MODULE_ALIAS_CRYPTO("crc32-generic");
155