1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Cryptographic API.
4 */
5
6 #include <linux/init.h>
7 #include <linux/module.h>
8 #include <linux/crypto.h>
9 #include <linux/vmalloc.h>
10 #include <linux/mm.h>
11 #include <linux/lzo.h>
12 #include <crypto/internal/scompress.h>
13
14 struct lzorle_ctx {
15 void *lzorle_comp_mem;
16 };
17
18 static void *lzorle_alloc_ctx(struct crypto_sc
19 {
20 void *ctx;
21
22 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP
23 if (!ctx)
24 return ERR_PTR(-ENOMEM);
25
26 return ctx;
27 }
28
29 static int lzorle_init(struct crypto_tfm *tfm)
30 {
31 struct lzorle_ctx *ctx = crypto_tfm_ct
32
33 ctx->lzorle_comp_mem = lzorle_alloc_ct
34 if (IS_ERR(ctx->lzorle_comp_mem))
35 return -ENOMEM;
36
37 return 0;
38 }
39
40 static void lzorle_free_ctx(struct crypto_scom
41 {
42 kvfree(ctx);
43 }
44
45 static void lzorle_exit(struct crypto_tfm *tfm
46 {
47 struct lzorle_ctx *ctx = crypto_tfm_ct
48
49 lzorle_free_ctx(NULL, ctx->lzorle_comp
50 }
51
52 static int __lzorle_compress(const u8 *src, un
53 u8 *dst, unsigned in
54 {
55 size_t tmp_len = *dlen; /* size_t(ulon
56 int err;
57
58 err = lzorle1x_1_compress(src, slen, d
59
60 if (err != LZO_E_OK)
61 return -EINVAL;
62
63 *dlen = tmp_len;
64 return 0;
65 }
66
67 static int lzorle_compress(struct crypto_tfm *
68 unsigned int slen, u8
69 {
70 struct lzorle_ctx *ctx = crypto_tfm_ct
71
72 return __lzorle_compress(src, slen, ds
73 }
74
75 static int lzorle_scompress(struct crypto_scom
76 unsigned int slen, u8
77 void *ctx)
78 {
79 return __lzorle_compress(src, slen, ds
80 }
81
82 static int __lzorle_decompress(const u8 *src,
83 u8 *dst, unsigned
84 {
85 int err;
86 size_t tmp_len = *dlen; /* size_t(ulon
87
88 err = lzo1x_decompress_safe(src, slen,
89
90 if (err != LZO_E_OK)
91 return -EINVAL;
92
93 *dlen = tmp_len;
94 return 0;
95 }
96
97 static int lzorle_decompress(struct crypto_tfm
98 unsigned int slen, u
99 {
100 return __lzorle_decompress(src, slen,
101 }
102
103 static int lzorle_sdecompress(struct crypto_sc
104 unsigned int slen,
105 void *ctx)
106 {
107 return __lzorle_decompress(src, slen,
108 }
109
110 static struct crypto_alg alg = {
111 .cra_name = "lzo-rle",
112 .cra_driver_name = "lzo-rle-gen
113 .cra_flags = CRYPTO_ALG_T
114 .cra_ctxsize = sizeof(struc
115 .cra_module = THIS_MODULE,
116 .cra_init = lzorle_init,
117 .cra_exit = lzorle_exit,
118 .cra_u = { .compress
119 .coa_compress = lzorle_compr
120 .coa_decompress = lzorle_decom
121 };
122
123 static struct scomp_alg scomp = {
124 .alloc_ctx = lzorle_alloc
125 .free_ctx = lzorle_free_
126 .compress = lzorle_scomp
127 .decompress = lzorle_sdeco
128 .base = {
129 .cra_name = "lzo-rle",
130 .cra_driver_name = "lzo-rle-sc
131 .cra_module = THIS_MODULE
132 }
133 };
134
135 static int __init lzorle_mod_init(void)
136 {
137 int ret;
138
139 ret = crypto_register_alg(&alg);
140 if (ret)
141 return ret;
142
143 ret = crypto_register_scomp(&scomp);
144 if (ret) {
145 crypto_unregister_alg(&alg);
146 return ret;
147 }
148
149 return ret;
150 }
151
152 static void __exit lzorle_mod_fini(void)
153 {
154 crypto_unregister_alg(&alg);
155 crypto_unregister_scomp(&scomp);
156 }
157
158 subsys_initcall(lzorle_mod_init);
159 module_exit(lzorle_mod_fini);
160
161 MODULE_LICENSE("GPL");
162 MODULE_DESCRIPTION("LZO-RLE Compression Algori
163 MODULE_ALIAS_CRYPTO("lzo-rle");
164
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