Merge tag 'tee-optee-for-5.4' of git://git.linaro.org/people/jens.wiklander/linux...
[platform/kernel/linux-rpi.git] / crypto / lz4hc.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 #include <linux/init.h>
8 #include <linux/module.h>
9 #include <linux/crypto.h>
10 #include <linux/vmalloc.h>
11 #include <linux/lz4.h>
12 #include <crypto/internal/scompress.h>
13
14 struct lz4hc_ctx {
15         void *lz4hc_comp_mem;
16 };
17
18 static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
19 {
20         void *ctx;
21
22         ctx = vmalloc(LZ4HC_MEM_COMPRESS);
23         if (!ctx)
24                 return ERR_PTR(-ENOMEM);
25
26         return ctx;
27 }
28
29 static int lz4hc_init(struct crypto_tfm *tfm)
30 {
31         struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
32
33         ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
34         if (IS_ERR(ctx->lz4hc_comp_mem))
35                 return -ENOMEM;
36
37         return 0;
38 }
39
40 static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
41 {
42         vfree(ctx);
43 }
44
45 static void lz4hc_exit(struct crypto_tfm *tfm)
46 {
47         struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
48
49         lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
50 }
51
52 static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
53                                    u8 *dst, unsigned int *dlen, void *ctx)
54 {
55         int out_len = LZ4_compress_HC(src, dst, slen,
56                 *dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
57
58         if (!out_len)
59                 return -EINVAL;
60
61         *dlen = out_len;
62         return 0;
63 }
64
65 static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
66                            unsigned int slen, u8 *dst, unsigned int *dlen,
67                            void *ctx)
68 {
69         return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
70 }
71
72 static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
73                                  unsigned int slen, u8 *dst,
74                                  unsigned int *dlen)
75 {
76         struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
77
78         return __lz4hc_compress_crypto(src, slen, dst, dlen,
79                                         ctx->lz4hc_comp_mem);
80 }
81
82 static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
83                                      u8 *dst, unsigned int *dlen, void *ctx)
84 {
85         int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
86
87         if (out_len < 0)
88                 return -EINVAL;
89
90         *dlen = out_len;
91         return 0;
92 }
93
94 static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
95                              unsigned int slen, u8 *dst, unsigned int *dlen,
96                              void *ctx)
97 {
98         return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
99 }
100
101 static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
102                                    unsigned int slen, u8 *dst,
103                                    unsigned int *dlen)
104 {
105         return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
106 }
107
108 static struct crypto_alg alg_lz4hc = {
109         .cra_name               = "lz4hc",
110         .cra_driver_name        = "lz4hc-generic",
111         .cra_flags              = CRYPTO_ALG_TYPE_COMPRESS,
112         .cra_ctxsize            = sizeof(struct lz4hc_ctx),
113         .cra_module             = THIS_MODULE,
114         .cra_init               = lz4hc_init,
115         .cra_exit               = lz4hc_exit,
116         .cra_u                  = { .compress = {
117         .coa_compress           = lz4hc_compress_crypto,
118         .coa_decompress         = lz4hc_decompress_crypto } }
119 };
120
121 static struct scomp_alg scomp = {
122         .alloc_ctx              = lz4hc_alloc_ctx,
123         .free_ctx               = lz4hc_free_ctx,
124         .compress               = lz4hc_scompress,
125         .decompress             = lz4hc_sdecompress,
126         .base                   = {
127                 .cra_name       = "lz4hc",
128                 .cra_driver_name = "lz4hc-scomp",
129                 .cra_module      = THIS_MODULE,
130         }
131 };
132
133 static int __init lz4hc_mod_init(void)
134 {
135         int ret;
136
137         ret = crypto_register_alg(&alg_lz4hc);
138         if (ret)
139                 return ret;
140
141         ret = crypto_register_scomp(&scomp);
142         if (ret) {
143                 crypto_unregister_alg(&alg_lz4hc);
144                 return ret;
145         }
146
147         return ret;
148 }
149
150 static void __exit lz4hc_mod_fini(void)
151 {
152         crypto_unregister_alg(&alg_lz4hc);
153         crypto_unregister_scomp(&scomp);
154 }
155
156 subsys_initcall(lz4hc_mod_init);
157 module_exit(lz4hc_mod_fini);
158
159 MODULE_LICENSE("GPL");
160 MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
161 MODULE_ALIAS_CRYPTO("lz4hc");