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 20
8 #include <linux/init.h> 21 #include <linux/init.h>
9 #include <linux/module.h> 22 #include <linux/module.h>
10 #include <linux/crypto.h> 23 #include <linux/crypto.h>
11 #include <linux/vmalloc.h> 24 #include <linux/vmalloc.h>
12 #include <linux/lz4.h> 25 #include <linux/lz4.h>
13 #include <crypto/internal/scompress.h> 26 #include <crypto/internal/scompress.h>
14 27
15 struct lz4_ctx { 28 struct lz4_ctx {
16 void *lz4_comp_mem; 29 void *lz4_comp_mem;
17 }; 30 };
18 31
19 static void *lz4_alloc_ctx(struct crypto_scomp 32 static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
20 { 33 {
21 void *ctx; 34 void *ctx;
22 35
23 ctx = vmalloc(LZ4_MEM_COMPRESS); 36 ctx = vmalloc(LZ4_MEM_COMPRESS);
24 if (!ctx) 37 if (!ctx)
25 return ERR_PTR(-ENOMEM); 38 return ERR_PTR(-ENOMEM);
26 39
27 return ctx; 40 return ctx;
28 } 41 }
29 42
30 static int lz4_init(struct crypto_tfm *tfm) 43 static int lz4_init(struct crypto_tfm *tfm)
31 { 44 {
32 struct lz4_ctx *ctx = crypto_tfm_ctx(t 45 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
33 46
34 ctx->lz4_comp_mem = lz4_alloc_ctx(NULL 47 ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
35 if (IS_ERR(ctx->lz4_comp_mem)) 48 if (IS_ERR(ctx->lz4_comp_mem))
36 return -ENOMEM; 49 return -ENOMEM;
37 50
38 return 0; 51 return 0;
39 } 52 }
40 53
41 static void lz4_free_ctx(struct crypto_scomp * 54 static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
42 { 55 {
43 vfree(ctx); 56 vfree(ctx);
44 } 57 }
45 58
46 static void lz4_exit(struct crypto_tfm *tfm) 59 static void lz4_exit(struct crypto_tfm *tfm)
47 { 60 {
48 struct lz4_ctx *ctx = crypto_tfm_ctx(t 61 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
49 62
50 lz4_free_ctx(NULL, ctx->lz4_comp_mem); 63 lz4_free_ctx(NULL, ctx->lz4_comp_mem);
51 } 64 }
52 65
53 static int __lz4_compress_crypto(const u8 *src 66 static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
54 u8 *dst, unsi 67 u8 *dst, unsigned int *dlen, void *ctx)
55 { 68 {
56 int out_len = LZ4_compress_default(src 69 int out_len = LZ4_compress_default(src, dst,
57 slen, *dlen, ctx); 70 slen, *dlen, ctx);
58 71
59 if (!out_len) 72 if (!out_len)
60 return -EINVAL; 73 return -EINVAL;
61 74
62 *dlen = out_len; 75 *dlen = out_len;
63 return 0; 76 return 0;
64 } 77 }
65 78
66 static int lz4_scompress(struct crypto_scomp * 79 static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
67 unsigned int slen, u8 80 unsigned int slen, u8 *dst, unsigned int *dlen,
68 void *ctx) 81 void *ctx)
69 { 82 {
70 return __lz4_compress_crypto(src, slen 83 return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
71 } 84 }
72 85
73 static int lz4_compress_crypto(struct crypto_t 86 static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
74 unsigned int sl 87 unsigned int slen, u8 *dst, unsigned int *dlen)
75 { 88 {
76 struct lz4_ctx *ctx = crypto_tfm_ctx(t 89 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
77 90
78 return __lz4_compress_crypto(src, slen 91 return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
79 } 92 }
80 93
81 static int __lz4_decompress_crypto(const u8 *s 94 static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
82 u8 *dst, un 95 u8 *dst, unsigned int *dlen, void *ctx)
83 { 96 {
84 int out_len = LZ4_decompress_safe(src, 97 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
85 98
86 if (out_len < 0) 99 if (out_len < 0)
87 return -EINVAL; 100 return -EINVAL;
88 101
89 *dlen = out_len; 102 *dlen = out_len;
90 return 0; 103 return 0;
91 } 104 }
92 105
93 static int lz4_sdecompress(struct crypto_scomp 106 static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
94 unsigned int slen, 107 unsigned int slen, u8 *dst, unsigned int *dlen,
95 void *ctx) 108 void *ctx)
96 { 109 {
97 return __lz4_decompress_crypto(src, sl 110 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
98 } 111 }
99 112
100 static int lz4_decompress_crypto(struct crypto 113 static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
101 unsigned int 114 unsigned int slen, u8 *dst,
102 unsigned int 115 unsigned int *dlen)
103 { 116 {
104 return __lz4_decompress_crypto(src, sl 117 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
105 } 118 }
106 119
107 static struct crypto_alg alg_lz4 = { 120 static struct crypto_alg alg_lz4 = {
108 .cra_name = "lz4", 121 .cra_name = "lz4",
109 .cra_driver_name = "lz4-generic <<
110 .cra_flags = CRYPTO_ALG_T 122 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
111 .cra_ctxsize = sizeof(struc 123 .cra_ctxsize = sizeof(struct lz4_ctx),
112 .cra_module = THIS_MODULE, 124 .cra_module = THIS_MODULE,
113 .cra_init = lz4_init, 125 .cra_init = lz4_init,
114 .cra_exit = lz4_exit, 126 .cra_exit = lz4_exit,
115 .cra_u = { .compress 127 .cra_u = { .compress = {
116 .coa_compress = lz4_compress 128 .coa_compress = lz4_compress_crypto,
117 .coa_decompress = lz4_decompre 129 .coa_decompress = lz4_decompress_crypto } }
118 }; 130 };
119 131
120 static struct scomp_alg scomp = { 132 static struct scomp_alg scomp = {
121 .alloc_ctx = lz4_alloc_ct 133 .alloc_ctx = lz4_alloc_ctx,
122 .free_ctx = lz4_free_ctx 134 .free_ctx = lz4_free_ctx,
123 .compress = lz4_scompres 135 .compress = lz4_scompress,
124 .decompress = lz4_sdecompr 136 .decompress = lz4_sdecompress,
125 .base = { 137 .base = {
126 .cra_name = "lz4", 138 .cra_name = "lz4",
127 .cra_driver_name = "lz4-scomp" 139 .cra_driver_name = "lz4-scomp",
128 .cra_module = THIS_MODULE 140 .cra_module = THIS_MODULE,
129 } 141 }
130 }; 142 };
131 143
132 static int __init lz4_mod_init(void) 144 static int __init lz4_mod_init(void)
133 { 145 {
134 int ret; 146 int ret;
135 147
136 ret = crypto_register_alg(&alg_lz4); 148 ret = crypto_register_alg(&alg_lz4);
137 if (ret) 149 if (ret)
138 return ret; 150 return ret;
139 151
140 ret = crypto_register_scomp(&scomp); 152 ret = crypto_register_scomp(&scomp);
141 if (ret) { 153 if (ret) {
142 crypto_unregister_alg(&alg_lz4 154 crypto_unregister_alg(&alg_lz4);
143 return ret; 155 return ret;
144 } 156 }
145 157
146 return ret; 158 return ret;
147 } 159 }
148 160
149 static void __exit lz4_mod_fini(void) 161 static void __exit lz4_mod_fini(void)
150 { 162 {
151 crypto_unregister_alg(&alg_lz4); 163 crypto_unregister_alg(&alg_lz4);
152 crypto_unregister_scomp(&scomp); 164 crypto_unregister_scomp(&scomp);
153 } 165 }
154 166
155 subsys_initcall(lz4_mod_init); !! 167 module_init(lz4_mod_init);
156 module_exit(lz4_mod_fini); 168 module_exit(lz4_mod_fini);
157 169
158 MODULE_LICENSE("GPL"); 170 MODULE_LICENSE("GPL");
159 MODULE_DESCRIPTION("LZ4 Compression Algorithm" 171 MODULE_DESCRIPTION("LZ4 Compression Algorithm");
160 MODULE_ALIAS_CRYPTO("lz4"); 172 MODULE_ALIAS_CRYPTO("lz4");
161 173
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TOMOYO® is a registered trademark of NTT DATA CORPORATION.