1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * Cryptographic API. 3 * Cryptographic API.
4 * 4 *
5 * Copyright (c) 2013 Chanho Min <chanho.min@l 5 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
6 */ 6 */
7 #include <linux/init.h> 7 #include <linux/init.h>
8 #include <linux/module.h> 8 #include <linux/module.h>
9 #include <linux/crypto.h> 9 #include <linux/crypto.h>
10 #include <linux/vmalloc.h> 10 #include <linux/vmalloc.h>
11 #include <linux/lz4.h> 11 #include <linux/lz4.h>
12 #include <crypto/internal/scompress.h> 12 #include <crypto/internal/scompress.h>
13 13
14 struct lz4hc_ctx { 14 struct lz4hc_ctx {
15 void *lz4hc_comp_mem; 15 void *lz4hc_comp_mem;
16 }; 16 };
17 17
18 static void *lz4hc_alloc_ctx(struct crypto_sco 18 static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
19 { 19 {
20 void *ctx; 20 void *ctx;
21 21
22 ctx = vmalloc(LZ4HC_MEM_COMPRESS); 22 ctx = vmalloc(LZ4HC_MEM_COMPRESS);
23 if (!ctx) 23 if (!ctx)
24 return ERR_PTR(-ENOMEM); 24 return ERR_PTR(-ENOMEM);
25 25
26 return ctx; 26 return ctx;
27 } 27 }
28 28
29 static int lz4hc_init(struct crypto_tfm *tfm) 29 static int lz4hc_init(struct crypto_tfm *tfm)
30 { 30 {
31 struct lz4hc_ctx *ctx = crypto_tfm_ctx 31 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
32 32
33 ctx->lz4hc_comp_mem = lz4hc_alloc_ctx( 33 ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
34 if (IS_ERR(ctx->lz4hc_comp_mem)) 34 if (IS_ERR(ctx->lz4hc_comp_mem))
35 return -ENOMEM; 35 return -ENOMEM;
36 36
37 return 0; 37 return 0;
38 } 38 }
39 39
40 static void lz4hc_free_ctx(struct crypto_scomp 40 static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
41 { 41 {
42 vfree(ctx); 42 vfree(ctx);
43 } 43 }
44 44
45 static void lz4hc_exit(struct crypto_tfm *tfm) 45 static void lz4hc_exit(struct crypto_tfm *tfm)
46 { 46 {
47 struct lz4hc_ctx *ctx = crypto_tfm_ctx 47 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
48 48
49 lz4hc_free_ctx(NULL, ctx->lz4hc_comp_m 49 lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
50 } 50 }
51 51
52 static int __lz4hc_compress_crypto(const u8 *s 52 static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
53 u8 *dst, un 53 u8 *dst, unsigned int *dlen, void *ctx)
54 { 54 {
55 int out_len = LZ4_compress_HC(src, dst 55 int out_len = LZ4_compress_HC(src, dst, slen,
56 *dlen, LZ4HC_DEFAULT_CLEVEL, c 56 *dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
57 57
58 if (!out_len) 58 if (!out_len)
59 return -EINVAL; 59 return -EINVAL;
60 60
61 *dlen = out_len; 61 *dlen = out_len;
62 return 0; 62 return 0;
63 } 63 }
64 64
65 static int lz4hc_scompress(struct crypto_scomp 65 static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
66 unsigned int slen, 66 unsigned int slen, u8 *dst, unsigned int *dlen,
67 void *ctx) 67 void *ctx)
68 { 68 {
69 return __lz4hc_compress_crypto(src, sl 69 return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
70 } 70 }
71 71
72 static int lz4hc_compress_crypto(struct crypto 72 static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
73 unsigned int 73 unsigned int slen, u8 *dst,
74 unsigned int 74 unsigned int *dlen)
75 { 75 {
76 struct lz4hc_ctx *ctx = crypto_tfm_ctx 76 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
77 77
78 return __lz4hc_compress_crypto(src, sl 78 return __lz4hc_compress_crypto(src, slen, dst, dlen,
79 ctx->l 79 ctx->lz4hc_comp_mem);
80 } 80 }
81 81
82 static int __lz4hc_decompress_crypto(const u8 82 static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
83 u8 *dst, 83 u8 *dst, unsigned int *dlen, void *ctx)
84 { 84 {
85 int out_len = LZ4_decompress_safe(src, 85 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
86 86
87 if (out_len < 0) 87 if (out_len < 0)
88 return -EINVAL; 88 return -EINVAL;
89 89
90 *dlen = out_len; 90 *dlen = out_len;
91 return 0; 91 return 0;
92 } 92 }
93 93
94 static int lz4hc_sdecompress(struct crypto_sco 94 static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
95 unsigned int slen 95 unsigned int slen, u8 *dst, unsigned int *dlen,
96 void *ctx) 96 void *ctx)
97 { 97 {
98 return __lz4hc_decompress_crypto(src, 98 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
99 } 99 }
100 100
101 static int lz4hc_decompress_crypto(struct cryp 101 static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
102 unsigned in 102 unsigned int slen, u8 *dst,
103 unsigned in 103 unsigned int *dlen)
104 { 104 {
105 return __lz4hc_decompress_crypto(src, 105 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
106 } 106 }
107 107
108 static struct crypto_alg alg_lz4hc = { 108 static struct crypto_alg alg_lz4hc = {
109 .cra_name = "lz4hc", 109 .cra_name = "lz4hc",
110 .cra_driver_name = "lz4hc-gener 110 .cra_driver_name = "lz4hc-generic",
111 .cra_flags = CRYPTO_ALG_T 111 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
112 .cra_ctxsize = sizeof(struc 112 .cra_ctxsize = sizeof(struct lz4hc_ctx),
113 .cra_module = THIS_MODULE, 113 .cra_module = THIS_MODULE,
114 .cra_init = lz4hc_init, 114 .cra_init = lz4hc_init,
115 .cra_exit = lz4hc_exit, 115 .cra_exit = lz4hc_exit,
116 .cra_u = { .compress 116 .cra_u = { .compress = {
117 .coa_compress = lz4hc_compre 117 .coa_compress = lz4hc_compress_crypto,
118 .coa_decompress = lz4hc_decomp 118 .coa_decompress = lz4hc_decompress_crypto } }
119 }; 119 };
120 120
121 static struct scomp_alg scomp = { 121 static struct scomp_alg scomp = {
122 .alloc_ctx = lz4hc_alloc_ 122 .alloc_ctx = lz4hc_alloc_ctx,
123 .free_ctx = lz4hc_free_c 123 .free_ctx = lz4hc_free_ctx,
124 .compress = lz4hc_scompr 124 .compress = lz4hc_scompress,
125 .decompress = lz4hc_sdecom 125 .decompress = lz4hc_sdecompress,
126 .base = { 126 .base = {
127 .cra_name = "lz4hc", 127 .cra_name = "lz4hc",
128 .cra_driver_name = "lz4hc-scom 128 .cra_driver_name = "lz4hc-scomp",
129 .cra_module = THIS_MODULE 129 .cra_module = THIS_MODULE,
130 } 130 }
131 }; 131 };
132 132
133 static int __init lz4hc_mod_init(void) 133 static int __init lz4hc_mod_init(void)
134 { 134 {
135 int ret; 135 int ret;
136 136
137 ret = crypto_register_alg(&alg_lz4hc); 137 ret = crypto_register_alg(&alg_lz4hc);
138 if (ret) 138 if (ret)
139 return ret; 139 return ret;
140 140
141 ret = crypto_register_scomp(&scomp); 141 ret = crypto_register_scomp(&scomp);
142 if (ret) { 142 if (ret) {
143 crypto_unregister_alg(&alg_lz4 143 crypto_unregister_alg(&alg_lz4hc);
144 return ret; 144 return ret;
145 } 145 }
146 146
147 return ret; 147 return ret;
148 } 148 }
149 149
150 static void __exit lz4hc_mod_fini(void) 150 static void __exit lz4hc_mod_fini(void)
151 { 151 {
152 crypto_unregister_alg(&alg_lz4hc); 152 crypto_unregister_alg(&alg_lz4hc);
153 crypto_unregister_scomp(&scomp); 153 crypto_unregister_scomp(&scomp);
154 } 154 }
155 155
156 subsys_initcall(lz4hc_mod_init); 156 subsys_initcall(lz4hc_mod_init);
157 module_exit(lz4hc_mod_fini); 157 module_exit(lz4hc_mod_fini);
158 158
159 MODULE_LICENSE("GPL"); 159 MODULE_LICENSE("GPL");
160 MODULE_DESCRIPTION("LZ4HC Compression Algorith 160 MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
161 MODULE_ALIAS_CRYPTO("lz4hc"); 161 MODULE_ALIAS_CRYPTO("lz4hc");
162 162
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.