1 // SPDX-License-Identifier: GPL-2.0-only !! 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
2 /* 24 /*
3 * Copyright 2012 Xyratex Technology Limited 25 * Copyright 2012 Xyratex Technology Limited
4 */ 26 */
5 27
6 /* 28 /*
7 * This is crypto api shash wrappers to crc32_ 29 * This is crypto api shash wrappers to crc32_le.
8 */ 30 */
9 31
10 #include <linux/unaligned.h> !! 32 #include <asm/unaligned.h>
11 #include <linux/crc32.h> 33 #include <linux/crc32.h>
12 #include <crypto/internal/hash.h> 34 #include <crypto/internal/hash.h>
13 #include <linux/init.h> 35 #include <linux/init.h>
14 #include <linux/module.h> 36 #include <linux/module.h>
15 #include <linux/string.h> 37 #include <linux/string.h>
16 #include <linux/kernel.h> 38 #include <linux/kernel.h>
17 39
18 #define CHKSUM_BLOCK_SIZE 1 40 #define CHKSUM_BLOCK_SIZE 1
19 #define CHKSUM_DIGEST_SIZE 4 41 #define CHKSUM_DIGEST_SIZE 4
20 42
21 /** No default init with ~0 */ 43 /** No default init with ~0 */
22 static int crc32_cra_init(struct crypto_tfm *t 44 static int crc32_cra_init(struct crypto_tfm *tfm)
23 { 45 {
24 u32 *key = crypto_tfm_ctx(tfm); 46 u32 *key = crypto_tfm_ctx(tfm);
25 47
26 *key = 0; 48 *key = 0;
27 49
28 return 0; 50 return 0;
29 } 51 }
30 52
31 /* 53 /*
32 * Setting the seed allows arbitrary accumulat 54 * Setting the seed allows arbitrary accumulators and flexible XOR policy
33 * If your algorithm starts with ~0, then XOR 55 * If your algorithm starts with ~0, then XOR with ~0 before you set
34 * the seed. 56 * the seed.
35 */ 57 */
36 static int crc32_setkey(struct crypto_shash *h 58 static int crc32_setkey(struct crypto_shash *hash, const u8 *key,
37 unsigned int keylen) 59 unsigned int keylen)
38 { 60 {
39 u32 *mctx = crypto_shash_ctx(hash); 61 u32 *mctx = crypto_shash_ctx(hash);
40 62
41 if (keylen != sizeof(u32)) !! 63 if (keylen != sizeof(u32)) {
>> 64 crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
42 return -EINVAL; 65 return -EINVAL;
>> 66 }
43 *mctx = get_unaligned_le32(key); 67 *mctx = get_unaligned_le32(key);
44 return 0; 68 return 0;
45 } 69 }
46 70
47 static int crc32_init(struct shash_desc *desc) 71 static int crc32_init(struct shash_desc *desc)
48 { 72 {
49 u32 *mctx = crypto_shash_ctx(desc->tfm 73 u32 *mctx = crypto_shash_ctx(desc->tfm);
50 u32 *crcp = shash_desc_ctx(desc); 74 u32 *crcp = shash_desc_ctx(desc);
51 75
52 *crcp = *mctx; 76 *crcp = *mctx;
53 77
54 return 0; 78 return 0;
55 } 79 }
56 80
57 static int crc32_update(struct shash_desc *des 81 static int crc32_update(struct shash_desc *desc, const u8 *data,
58 unsigned int len) 82 unsigned int len)
59 { 83 {
60 u32 *crcp = shash_desc_ctx(desc); 84 u32 *crcp = shash_desc_ctx(desc);
61 85
62 *crcp = crc32_le(*crcp, data, len); 86 *crcp = crc32_le(*crcp, data, len);
63 return 0; 87 return 0;
64 } 88 }
65 89
66 /* No final XOR 0xFFFFFFFF, like crc32_le */ 90 /* No final XOR 0xFFFFFFFF, like crc32_le */
67 static int __crc32_finup(u32 *crcp, const u8 * 91 static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len,
68 u8 *out) 92 u8 *out)
69 { 93 {
70 put_unaligned_le32(crc32_le(*crcp, dat 94 put_unaligned_le32(crc32_le(*crcp, data, len), out);
71 return 0; 95 return 0;
72 } 96 }
73 97
74 static int crc32_finup(struct shash_desc *desc 98 static int crc32_finup(struct shash_desc *desc, const u8 *data,
75 unsigned int len, u8 *o 99 unsigned int len, u8 *out)
76 { 100 {
77 return __crc32_finup(shash_desc_ctx(de 101 return __crc32_finup(shash_desc_ctx(desc), data, len, out);
78 } 102 }
79 103
80 static int crc32_final(struct shash_desc *desc 104 static int crc32_final(struct shash_desc *desc, u8 *out)
81 { 105 {
82 u32 *crcp = shash_desc_ctx(desc); 106 u32 *crcp = shash_desc_ctx(desc);
83 107
84 put_unaligned_le32(*crcp, out); 108 put_unaligned_le32(*crcp, out);
85 return 0; 109 return 0;
86 } 110 }
87 111
88 static int crc32_digest(struct shash_desc *des 112 static int crc32_digest(struct shash_desc *desc, const u8 *data,
89 unsigned int len, u8 * 113 unsigned int len, u8 *out)
90 { 114 {
91 return __crc32_finup(crypto_shash_ctx( 115 return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len,
92 out); 116 out);
93 } 117 }
94 static struct shash_alg alg = { 118 static struct shash_alg alg = {
95 .setkey = crc32_setkey, 119 .setkey = crc32_setkey,
96 .init = crc32_init, 120 .init = crc32_init,
97 .update = crc32_update, 121 .update = crc32_update,
98 .final = crc32_final, 122 .final = crc32_final,
99 .finup = crc32_finup, 123 .finup = crc32_finup,
100 .digest = crc32_digest, 124 .digest = crc32_digest,
101 .descsize = sizeof(u32), 125 .descsize = sizeof(u32),
102 .digestsize = CHKSUM_DIGEST_SIZE, 126 .digestsize = CHKSUM_DIGEST_SIZE,
103 .base = { 127 .base = {
104 .cra_name = "crc 128 .cra_name = "crc32",
105 .cra_driver_name = "crc 129 .cra_driver_name = "crc32-generic",
106 .cra_priority = 100, 130 .cra_priority = 100,
107 .cra_flags = CRYP 131 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
108 .cra_blocksize = CHKS 132 .cra_blocksize = CHKSUM_BLOCK_SIZE,
109 .cra_ctxsize = size 133 .cra_ctxsize = sizeof(u32),
110 .cra_module = THIS 134 .cra_module = THIS_MODULE,
111 .cra_init = crc3 135 .cra_init = crc32_cra_init,
112 } 136 }
113 }; 137 };
114 138
115 static int __init crc32_mod_init(void) 139 static int __init crc32_mod_init(void)
116 { 140 {
117 return crypto_register_shash(&alg); 141 return crypto_register_shash(&alg);
118 } 142 }
119 143
120 static void __exit crc32_mod_fini(void) 144 static void __exit crc32_mod_fini(void)
121 { 145 {
122 crypto_unregister_shash(&alg); 146 crypto_unregister_shash(&alg);
123 } 147 }
124 148
125 subsys_initcall(crc32_mod_init); 149 subsys_initcall(crc32_mod_init);
126 module_exit(crc32_mod_fini); 150 module_exit(crc32_mod_fini);
127 151
128 MODULE_AUTHOR("Alexander Boyko <alexander_boyk 152 MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>");
129 MODULE_DESCRIPTION("CRC32 calculations wrapper 153 MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32");
130 MODULE_LICENSE("GPL"); 154 MODULE_LICENSE("GPL");
131 MODULE_ALIAS_CRYPTO("crc32"); 155 MODULE_ALIAS_CRYPTO("crc32");
132 MODULE_ALIAS_CRYPTO("crc32-generic"); 156 MODULE_ALIAS_CRYPTO("crc32-generic");
133 157
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