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 <crypto/internal/scompress.h>
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/vmalloc.h>
11 #include <linux/lz4.h>
12
lz4hc_alloc_ctx(void)13 static void *lz4hc_alloc_ctx(void)
14 {
15 void *ctx;
16
17 ctx = vmalloc(LZ4HC_MEM_COMPRESS);
18 if (!ctx)
19 return ERR_PTR(-ENOMEM);
20
21 return ctx;
22 }
23
lz4hc_free_ctx(void * ctx)24 static void lz4hc_free_ctx(void *ctx)
25 {
26 vfree(ctx);
27 }
28
__lz4hc_compress_crypto(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)29 static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
30 u8 *dst, unsigned int *dlen, void *ctx)
31 {
32 int out_len = LZ4_compress_HC(src, dst, slen,
33 *dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
34
35 if (!out_len)
36 return -EINVAL;
37
38 *dlen = out_len;
39 return 0;
40 }
41
lz4hc_scompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)42 static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
43 unsigned int slen, u8 *dst, unsigned int *dlen,
44 void *ctx)
45 {
46 return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
47 }
48
__lz4hc_decompress_crypto(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)49 static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
50 u8 *dst, unsigned int *dlen, void *ctx)
51 {
52 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
53
54 if (out_len < 0)
55 return -EINVAL;
56
57 *dlen = out_len;
58 return 0;
59 }
60
lz4hc_sdecompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)61 static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
62 unsigned int slen, u8 *dst, unsigned int *dlen,
63 void *ctx)
64 {
65 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
66 }
67
68 static struct scomp_alg scomp = {
69 .alloc_ctx = lz4hc_alloc_ctx,
70 .free_ctx = lz4hc_free_ctx,
71 .compress = lz4hc_scompress,
72 .decompress = lz4hc_sdecompress,
73 .base = {
74 .cra_name = "lz4hc",
75 .cra_driver_name = "lz4hc-scomp",
76 .cra_module = THIS_MODULE,
77 }
78 };
79
lz4hc_mod_init(void)80 static int __init lz4hc_mod_init(void)
81 {
82 return crypto_register_scomp(&scomp);
83 }
84
lz4hc_mod_fini(void)85 static void __exit lz4hc_mod_fini(void)
86 {
87 crypto_unregister_scomp(&scomp);
88 }
89
90 module_init(lz4hc_mod_init);
91 module_exit(lz4hc_mod_fini);
92
93 MODULE_LICENSE("GPL");
94 MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
95 MODULE_ALIAS_CRYPTO("lz4hc");
96