1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Cryptographic API. 2 * Cryptographic API.
4 * 3 *
5 * Copyright (c) 2013 Chanho Min <chanho.min@l 4 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
>> 5 *
>> 6 * This program is free software; you can redistribute it and/or modify it
>> 7 * under the terms of the GNU General Public License version 2 as published by
>> 8 * the Free Software Foundation.
>> 9 *
>> 10 * This program is distributed in the hope that it will be useful, but WITHOUT
>> 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
>> 13 * more details.
>> 14 *
>> 15 * You should have received a copy of the GNU General Public License along with
>> 16 * this program; if not, write to the Free Software Foundation, Inc., 51
>> 17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
>> 18 *
6 */ 19 */
7 #include <linux/init.h> 20 #include <linux/init.h>
8 #include <linux/module.h> 21 #include <linux/module.h>
9 #include <linux/crypto.h> 22 #include <linux/crypto.h>
10 #include <linux/vmalloc.h> 23 #include <linux/vmalloc.h>
11 #include <linux/lz4.h> 24 #include <linux/lz4.h>
12 #include <crypto/internal/scompress.h> <<
13 25
14 struct lz4hc_ctx { 26 struct lz4hc_ctx {
15 void *lz4hc_comp_mem; 27 void *lz4hc_comp_mem;
16 }; 28 };
17 29
18 static void *lz4hc_alloc_ctx(struct crypto_sco <<
19 { <<
20 void *ctx; <<
21 <<
22 ctx = vmalloc(LZ4HC_MEM_COMPRESS); <<
23 if (!ctx) <<
24 return ERR_PTR(-ENOMEM); <<
25 <<
26 return ctx; <<
27 } <<
28 <<
29 static int lz4hc_init(struct crypto_tfm *tfm) 30 static int lz4hc_init(struct crypto_tfm *tfm)
30 { 31 {
31 struct lz4hc_ctx *ctx = crypto_tfm_ctx 32 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
32 33
33 ctx->lz4hc_comp_mem = lz4hc_alloc_ctx( !! 34 ctx->lz4hc_comp_mem = vmalloc(LZ4HC_MEM_COMPRESS);
34 if (IS_ERR(ctx->lz4hc_comp_mem)) !! 35 if (!ctx->lz4hc_comp_mem)
35 return -ENOMEM; 36 return -ENOMEM;
36 37
37 return 0; 38 return 0;
38 } 39 }
39 40
40 static void lz4hc_free_ctx(struct crypto_scomp <<
41 { <<
42 vfree(ctx); <<
43 } <<
44 <<
45 static void lz4hc_exit(struct crypto_tfm *tfm) 41 static void lz4hc_exit(struct crypto_tfm *tfm)
46 { 42 {
47 struct lz4hc_ctx *ctx = crypto_tfm_ctx 43 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
48 44
49 lz4hc_free_ctx(NULL, ctx->lz4hc_comp_m !! 45 vfree(ctx->lz4hc_comp_mem);
50 } <<
51 <<
52 static int __lz4hc_compress_crypto(const u8 *s <<
53 u8 *dst, un <<
54 { <<
55 int out_len = LZ4_compress_HC(src, dst <<
56 *dlen, LZ4HC_DEFAULT_CLEVEL, c <<
57 <<
58 if (!out_len) <<
59 return -EINVAL; <<
60 <<
61 *dlen = out_len; <<
62 return 0; <<
63 } <<
64 <<
65 static int lz4hc_scompress(struct crypto_scomp <<
66 unsigned int slen, <<
67 void *ctx) <<
68 { <<
69 return __lz4hc_compress_crypto(src, sl <<
70 } 46 }
71 47
72 static int lz4hc_compress_crypto(struct crypto 48 static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
73 unsigned int !! 49 unsigned int slen, u8 *dst, unsigned int *dlen)
74 unsigned int <<
75 { 50 {
76 struct lz4hc_ctx *ctx = crypto_tfm_ctx 51 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
>> 52 size_t tmp_len = *dlen;
>> 53 int err;
77 54
78 return __lz4hc_compress_crypto(src, sl !! 55 err = lz4hc_compress(src, slen, dst, &tmp_len, ctx->lz4hc_comp_mem);
79 ctx->l <<
80 } <<
81 56
82 static int __lz4hc_decompress_crypto(const u8 !! 57 if (err < 0)
83 u8 *dst, <<
84 { <<
85 int out_len = LZ4_decompress_safe(src, <<
86 <<
87 if (out_len < 0) <<
88 return -EINVAL; 58 return -EINVAL;
89 59
90 *dlen = out_len; !! 60 *dlen = tmp_len;
91 return 0; 61 return 0;
92 } 62 }
93 63
94 static int lz4hc_sdecompress(struct crypto_sco <<
95 unsigned int slen <<
96 void *ctx) <<
97 { <<
98 return __lz4hc_decompress_crypto(src, <<
99 } <<
100 <<
101 static int lz4hc_decompress_crypto(struct cryp 64 static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
102 unsigned in !! 65 unsigned int slen, u8 *dst, unsigned int *dlen)
103 unsigned in <<
104 { 66 {
105 return __lz4hc_decompress_crypto(src, !! 67 int err;
>> 68 size_t tmp_len = *dlen;
>> 69 size_t __slen = slen;
>> 70
>> 71 err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
>> 72 if (err < 0)
>> 73 return -EINVAL;
>> 74
>> 75 *dlen = tmp_len;
>> 76 return err;
106 } 77 }
107 78
108 static struct crypto_alg alg_lz4hc = { 79 static struct crypto_alg alg_lz4hc = {
109 .cra_name = "lz4hc", 80 .cra_name = "lz4hc",
110 .cra_driver_name = "lz4hc-gener <<
111 .cra_flags = CRYPTO_ALG_T 81 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
112 .cra_ctxsize = sizeof(struc 82 .cra_ctxsize = sizeof(struct lz4hc_ctx),
113 .cra_module = THIS_MODULE, 83 .cra_module = THIS_MODULE,
>> 84 .cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
114 .cra_init = lz4hc_init, 85 .cra_init = lz4hc_init,
115 .cra_exit = lz4hc_exit, 86 .cra_exit = lz4hc_exit,
116 .cra_u = { .compress 87 .cra_u = { .compress = {
117 .coa_compress = lz4hc_compre 88 .coa_compress = lz4hc_compress_crypto,
118 .coa_decompress = lz4hc_decomp 89 .coa_decompress = lz4hc_decompress_crypto } }
119 }; 90 };
120 91
121 static struct scomp_alg scomp = { <<
122 .alloc_ctx = lz4hc_alloc_ <<
123 .free_ctx = lz4hc_free_c <<
124 .compress = lz4hc_scompr <<
125 .decompress = lz4hc_sdecom <<
126 .base = { <<
127 .cra_name = "lz4hc", <<
128 .cra_driver_name = "lz4hc-scom <<
129 .cra_module = THIS_MODULE <<
130 } <<
131 }; <<
132 <<
133 static int __init lz4hc_mod_init(void) 92 static int __init lz4hc_mod_init(void)
134 { 93 {
135 int ret; !! 94 return crypto_register_alg(&alg_lz4hc);
136 <<
137 ret = crypto_register_alg(&alg_lz4hc); <<
138 if (ret) <<
139 return ret; <<
140 <<
141 ret = crypto_register_scomp(&scomp); <<
142 if (ret) { <<
143 crypto_unregister_alg(&alg_lz4 <<
144 return ret; <<
145 } <<
146 <<
147 return ret; <<
148 } 95 }
149 96
150 static void __exit lz4hc_mod_fini(void) 97 static void __exit lz4hc_mod_fini(void)
151 { 98 {
152 crypto_unregister_alg(&alg_lz4hc); 99 crypto_unregister_alg(&alg_lz4hc);
153 crypto_unregister_scomp(&scomp); <<
154 } 100 }
155 101
156 subsys_initcall(lz4hc_mod_init); !! 102 module_init(lz4hc_mod_init);
157 module_exit(lz4hc_mod_fini); 103 module_exit(lz4hc_mod_fini);
158 104
159 MODULE_LICENSE("GPL"); 105 MODULE_LICENSE("GPL");
160 MODULE_DESCRIPTION("LZ4HC Compression Algorith 106 MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
161 MODULE_ALIAS_CRYPTO("lz4hc"); 107 MODULE_ALIAS_CRYPTO("lz4hc");
162 108
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