1 // SPDX-License-Identifier: GPL-2.0-only
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 lzo_ctx {
15 void *lzo_comp_mem;
16 };
17
18 static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
19 {
20 void *ctx;
21
22 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
23 if (!ctx)
24 return ERR_PTR(-ENOMEM);
25
26 return ctx;
27 }
28
29 static int lzo_init(struct crypto_tfm *tfm)
30 {
31 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
32
33 ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
34 if (IS_ERR(ctx->lzo_comp_mem))
35 return -ENOMEM;
36
37 return 0;
38 }
39
40 static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
41 {
42 kvfree(ctx);
43 }
44
45 static void lzo_exit(struct crypto_tfm *tfm)
46 {
47 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
48
49 lzo_free_ctx(NULL, ctx->lzo_comp_mem);
50 }
51
52 static int __lzo_compress(const u8 *src, unsigned int slen,
53 u8 *dst, unsigned int *dlen, void *ctx)
54 {
55 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
56 int err;
57
58 err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
59
60 if (err != LZO_E_OK)
61 return -EINVAL;
62
63 *dlen = tmp_len;
64 return 0;
65 }
66
67 static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
68 unsigned int slen, u8 *dst, unsigned int *dlen)
69 {
70 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
71
72 return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
73 }
74
75 static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
76 unsigned int slen, u8 *dst, unsigned int *dlen,
77 void *ctx)
78 {
79 return __lzo_compress(src, slen, dst, dlen, ctx);
80 }
81
82 static int __lzo_decompress(const u8 *src, unsigned int slen,
83 u8 *dst, unsigned int *dlen)
84 {
85 int err;
86 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
87
88 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
89
90 if (err != LZO_E_OK)
91 return -EINVAL;
92
93 *dlen = tmp_len;
94 return 0;
95 }
96
97 static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
98 unsigned int slen, u8 *dst, unsigned int *dlen)
99 {
100 return __lzo_decompress(src, slen, dst, dlen);
101 }
102
103 static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
104 unsigned int slen, u8 *dst, unsigned int *dlen,
105 void *ctx)
106 {
107 return __lzo_decompress(src, slen, dst, dlen);
108 }
109
110 static struct crypto_alg alg = {
111 .cra_name = "lzo",
112 .cra_driver_name = "lzo-generic",
113 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
114 .cra_ctxsize = sizeof(struct lzo_ctx),
115 .cra_module = THIS_MODULE,
116 .cra_init = lzo_init,
117 .cra_exit = lzo_exit,
118 .cra_u = { .compress = {
119 .coa_compress = lzo_compress,
120 .coa_decompress = lzo_decompress } }
121 };
122
123 static struct scomp_alg scomp = {
124 .alloc_ctx = lzo_alloc_ctx,
125 .free_ctx = lzo_free_ctx,
126 .compress = lzo_scompress,
127 .decompress = lzo_sdecompress,
128 .base = {
129 .cra_name = "lzo",
130 .cra_driver_name = "lzo-scomp",
131 .cra_module = THIS_MODULE,
132 }
133 };
134
135 static int __init lzo_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 lzo_mod_fini(void)
153 {
154 crypto_unregister_alg(&alg);
155 crypto_unregister_scomp(&scomp);
156 }
157
158 subsys_initcall(lzo_mod_init);
159 module_exit(lzo_mod_fini);
160
161 MODULE_LICENSE("GPL");
162 MODULE_DESCRIPTION("LZO Compression Algorithm");
163 MODULE_ALIAS_CRYPTO("lzo");
164
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