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 7
8 #include <linux/init.h> 8 #include <linux/init.h>
9 #include <linux/module.h> 9 #include <linux/module.h>
10 #include <linux/crypto.h> 10 #include <linux/crypto.h>
11 #include <linux/vmalloc.h> 11 #include <linux/vmalloc.h>
12 #include <linux/lz4.h> 12 #include <linux/lz4.h>
13 #include <crypto/internal/scompress.h> 13 #include <crypto/internal/scompress.h>
14 14
15 struct lz4_ctx { 15 struct lz4_ctx {
16 void *lz4_comp_mem; 16 void *lz4_comp_mem;
17 }; 17 };
18 18
19 static void *lz4_alloc_ctx(struct crypto_scomp 19 static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
20 { 20 {
21 void *ctx; 21 void *ctx;
22 22
23 ctx = vmalloc(LZ4_MEM_COMPRESS); 23 ctx = vmalloc(LZ4_MEM_COMPRESS);
24 if (!ctx) 24 if (!ctx)
25 return ERR_PTR(-ENOMEM); 25 return ERR_PTR(-ENOMEM);
26 26
27 return ctx; 27 return ctx;
28 } 28 }
29 29
30 static int lz4_init(struct crypto_tfm *tfm) 30 static int lz4_init(struct crypto_tfm *tfm)
31 { 31 {
32 struct lz4_ctx *ctx = crypto_tfm_ctx(t 32 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
33 33
34 ctx->lz4_comp_mem = lz4_alloc_ctx(NULL 34 ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
35 if (IS_ERR(ctx->lz4_comp_mem)) 35 if (IS_ERR(ctx->lz4_comp_mem))
36 return -ENOMEM; 36 return -ENOMEM;
37 37
38 return 0; 38 return 0;
39 } 39 }
40 40
41 static void lz4_free_ctx(struct crypto_scomp * 41 static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
42 { 42 {
43 vfree(ctx); 43 vfree(ctx);
44 } 44 }
45 45
46 static void lz4_exit(struct crypto_tfm *tfm) 46 static void lz4_exit(struct crypto_tfm *tfm)
47 { 47 {
48 struct lz4_ctx *ctx = crypto_tfm_ctx(t 48 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
49 49
50 lz4_free_ctx(NULL, ctx->lz4_comp_mem); 50 lz4_free_ctx(NULL, ctx->lz4_comp_mem);
51 } 51 }
52 52
53 static int __lz4_compress_crypto(const u8 *src 53 static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
54 u8 *dst, unsi 54 u8 *dst, unsigned int *dlen, void *ctx)
55 { 55 {
56 int out_len = LZ4_compress_default(src 56 int out_len = LZ4_compress_default(src, dst,
57 slen, *dlen, ctx); 57 slen, *dlen, ctx);
58 58
59 if (!out_len) 59 if (!out_len)
60 return -EINVAL; 60 return -EINVAL;
61 61
62 *dlen = out_len; 62 *dlen = out_len;
63 return 0; 63 return 0;
64 } 64 }
65 65
66 static int lz4_scompress(struct crypto_scomp * 66 static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
67 unsigned int slen, u8 67 unsigned int slen, u8 *dst, unsigned int *dlen,
68 void *ctx) 68 void *ctx)
69 { 69 {
70 return __lz4_compress_crypto(src, slen 70 return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
71 } 71 }
72 72
73 static int lz4_compress_crypto(struct crypto_t 73 static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
74 unsigned int sl 74 unsigned int slen, u8 *dst, unsigned int *dlen)
75 { 75 {
76 struct lz4_ctx *ctx = crypto_tfm_ctx(t 76 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
77 77
78 return __lz4_compress_crypto(src, slen 78 return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
79 } 79 }
80 80
81 static int __lz4_decompress_crypto(const u8 *s 81 static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
82 u8 *dst, un 82 u8 *dst, unsigned int *dlen, void *ctx)
83 { 83 {
84 int out_len = LZ4_decompress_safe(src, 84 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
85 85
86 if (out_len < 0) 86 if (out_len < 0)
87 return -EINVAL; 87 return -EINVAL;
88 88
89 *dlen = out_len; 89 *dlen = out_len;
90 return 0; 90 return 0;
91 } 91 }
92 92
93 static int lz4_sdecompress(struct crypto_scomp 93 static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
94 unsigned int slen, 94 unsigned int slen, u8 *dst, unsigned int *dlen,
95 void *ctx) 95 void *ctx)
96 { 96 {
97 return __lz4_decompress_crypto(src, sl 97 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
98 } 98 }
99 99
100 static int lz4_decompress_crypto(struct crypto 100 static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
101 unsigned int 101 unsigned int slen, u8 *dst,
102 unsigned int 102 unsigned int *dlen)
103 { 103 {
104 return __lz4_decompress_crypto(src, sl 104 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
105 } 105 }
106 106
107 static struct crypto_alg alg_lz4 = { 107 static struct crypto_alg alg_lz4 = {
108 .cra_name = "lz4", 108 .cra_name = "lz4",
109 .cra_driver_name = "lz4-generic 109 .cra_driver_name = "lz4-generic",
110 .cra_flags = CRYPTO_ALG_T 110 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
111 .cra_ctxsize = sizeof(struc 111 .cra_ctxsize = sizeof(struct lz4_ctx),
112 .cra_module = THIS_MODULE, 112 .cra_module = THIS_MODULE,
113 .cra_init = lz4_init, 113 .cra_init = lz4_init,
114 .cra_exit = lz4_exit, 114 .cra_exit = lz4_exit,
115 .cra_u = { .compress 115 .cra_u = { .compress = {
116 .coa_compress = lz4_compress 116 .coa_compress = lz4_compress_crypto,
117 .coa_decompress = lz4_decompre 117 .coa_decompress = lz4_decompress_crypto } }
118 }; 118 };
119 119
120 static struct scomp_alg scomp = { 120 static struct scomp_alg scomp = {
121 .alloc_ctx = lz4_alloc_ct 121 .alloc_ctx = lz4_alloc_ctx,
122 .free_ctx = lz4_free_ctx 122 .free_ctx = lz4_free_ctx,
123 .compress = lz4_scompres 123 .compress = lz4_scompress,
124 .decompress = lz4_sdecompr 124 .decompress = lz4_sdecompress,
125 .base = { 125 .base = {
126 .cra_name = "lz4", 126 .cra_name = "lz4",
127 .cra_driver_name = "lz4-scomp" 127 .cra_driver_name = "lz4-scomp",
128 .cra_module = THIS_MODULE 128 .cra_module = THIS_MODULE,
129 } 129 }
130 }; 130 };
131 131
132 static int __init lz4_mod_init(void) 132 static int __init lz4_mod_init(void)
133 { 133 {
134 int ret; 134 int ret;
135 135
136 ret = crypto_register_alg(&alg_lz4); 136 ret = crypto_register_alg(&alg_lz4);
137 if (ret) 137 if (ret)
138 return ret; 138 return ret;
139 139
140 ret = crypto_register_scomp(&scomp); 140 ret = crypto_register_scomp(&scomp);
141 if (ret) { 141 if (ret) {
142 crypto_unregister_alg(&alg_lz4 142 crypto_unregister_alg(&alg_lz4);
143 return ret; 143 return ret;
144 } 144 }
145 145
146 return ret; 146 return ret;
147 } 147 }
148 148
149 static void __exit lz4_mod_fini(void) 149 static void __exit lz4_mod_fini(void)
150 { 150 {
151 crypto_unregister_alg(&alg_lz4); 151 crypto_unregister_alg(&alg_lz4);
152 crypto_unregister_scomp(&scomp); 152 crypto_unregister_scomp(&scomp);
153 } 153 }
154 154
155 subsys_initcall(lz4_mod_init); 155 subsys_initcall(lz4_mod_init);
156 module_exit(lz4_mod_fini); 156 module_exit(lz4_mod_fini);
157 157
158 MODULE_LICENSE("GPL"); 158 MODULE_LICENSE("GPL");
159 MODULE_DESCRIPTION("LZ4 Compression Algorithm" 159 MODULE_DESCRIPTION("LZ4 Compression Algorithm");
160 MODULE_ALIAS_CRYPTO("lz4"); 160 MODULE_ALIAS_CRYPTO("lz4");
161 161
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