Merge tag 'linux-kselftest-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / crypto / lz4.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Cryptographic API.
4  *
5  * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
6  */
7
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/crypto.h>
11 #include <linux/vmalloc.h>
12 #include <linux/lz4.h>
13 #include <crypto/internal/scompress.h>
14
15 struct lz4_ctx {
16         void *lz4_comp_mem;
17 };
18
19 static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
20 {
21         void *ctx;
22
23         ctx = vmalloc(LZ4_MEM_COMPRESS);
24         if (!ctx)
25                 return ERR_PTR(-ENOMEM);
26
27         return ctx;
28 }
29
30 static int lz4_init(struct crypto_tfm *tfm)
31 {
32         struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
33
34         ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
35         if (IS_ERR(ctx->lz4_comp_mem))
36                 return -ENOMEM;
37
38         return 0;
39 }
40
41 static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
42 {
43         vfree(ctx);
44 }
45
46 static void lz4_exit(struct crypto_tfm *tfm)
47 {
48         struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
49
50         lz4_free_ctx(NULL, ctx->lz4_comp_mem);
51 }
52
53 static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
54                                  u8 *dst, unsigned int *dlen, void *ctx)
55 {
56         int out_len = LZ4_compress_default(src, dst,
57                 slen, *dlen, ctx);
58
59         if (!out_len)
60                 return -EINVAL;
61
62         *dlen = out_len;
63         return 0;
64 }
65
66 static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
67                          unsigned int slen, u8 *dst, unsigned int *dlen,
68                          void *ctx)
69 {
70         return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
71 }
72
73 static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
74                                unsigned int slen, u8 *dst, unsigned int *dlen)
75 {
76         struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
77
78         return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
79 }
80
81 static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
82                                    u8 *dst, unsigned int *dlen, void *ctx)
83 {
84         int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
85
86         if (out_len < 0)
87                 return -EINVAL;
88
89         *dlen = out_len;
90         return 0;
91 }
92
93 static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
94                            unsigned int slen, u8 *dst, unsigned int *dlen,
95                            void *ctx)
96 {
97         return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
98 }
99
100 static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
101                                  unsigned int slen, u8 *dst,
102                                  unsigned int *dlen)
103 {
104         return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
105 }
106
107 static struct crypto_alg alg_lz4 = {
108         .cra_name               = "lz4",
109         .cra_driver_name        = "lz4-generic",
110         .cra_flags              = CRYPTO_ALG_TYPE_COMPRESS,
111         .cra_ctxsize            = sizeof(struct lz4_ctx),
112         .cra_module             = THIS_MODULE,
113         .cra_init               = lz4_init,
114         .cra_exit               = lz4_exit,
115         .cra_u                  = { .compress = {
116         .coa_compress           = lz4_compress_crypto,
117         .coa_decompress         = lz4_decompress_crypto } }
118 };
119
120 static struct scomp_alg scomp = {
121         .alloc_ctx              = lz4_alloc_ctx,
122         .free_ctx               = lz4_free_ctx,
123         .compress               = lz4_scompress,
124         .decompress             = lz4_sdecompress,
125         .base                   = {
126                 .cra_name       = "lz4",
127                 .cra_driver_name = "lz4-scomp",
128                 .cra_module      = THIS_MODULE,
129         }
130 };
131
132 static int __init lz4_mod_init(void)
133 {
134         int ret;
135
136         ret = crypto_register_alg(&alg_lz4);
137         if (ret)
138                 return ret;
139
140         ret = crypto_register_scomp(&scomp);
141         if (ret) {
142                 crypto_unregister_alg(&alg_lz4);
143                 return ret;
144         }
145
146         return ret;
147 }
148
149 static void __exit lz4_mod_fini(void)
150 {
151         crypto_unregister_alg(&alg_lz4);
152         crypto_unregister_scomp(&scomp);
153 }
154
155 subsys_initcall(lz4_mod_init);
156 module_exit(lz4_mod_fini);
157
158 MODULE_LICENSE("GPL");
159 MODULE_DESCRIPTION("LZ4 Compression Algorithm");
160 MODULE_ALIAS_CRYPTO("lz4");