Linux kernel mirror (for testing)
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linux
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
15static void *lz4_alloc_ctx(void)
16{
17 void *ctx;
18
19 ctx = vmalloc(LZ4_MEM_COMPRESS);
20 if (!ctx)
21 return ERR_PTR(-ENOMEM);
22
23 return ctx;
24}
25
26static void lz4_free_ctx(void *ctx)
27{
28 vfree(ctx);
29}
30
31static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
32 u8 *dst, unsigned int *dlen, void *ctx)
33{
34 int out_len = LZ4_compress_default(src, dst,
35 slen, *dlen, ctx);
36
37 if (!out_len)
38 return -EINVAL;
39
40 *dlen = out_len;
41 return 0;
42}
43
44static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
45 unsigned int slen, u8 *dst, unsigned int *dlen,
46 void *ctx)
47{
48 return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
49}
50
51static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
52 u8 *dst, unsigned int *dlen, void *ctx)
53{
54 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
55
56 if (out_len < 0)
57 return -EINVAL;
58
59 *dlen = out_len;
60 return 0;
61}
62
63static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
64 unsigned int slen, u8 *dst, unsigned int *dlen,
65 void *ctx)
66{
67 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
68}
69
70static struct scomp_alg scomp = {
71 .alloc_ctx = lz4_alloc_ctx,
72 .free_ctx = lz4_free_ctx,
73 .compress = lz4_scompress,
74 .decompress = lz4_sdecompress,
75 .base = {
76 .cra_name = "lz4",
77 .cra_driver_name = "lz4-scomp",
78 .cra_module = THIS_MODULE,
79 }
80};
81
82static int __init lz4_mod_init(void)
83{
84 return crypto_register_scomp(&scomp);
85}
86
87static void __exit lz4_mod_fini(void)
88{
89 crypto_unregister_scomp(&scomp);
90}
91
92module_init(lz4_mod_init);
93module_exit(lz4_mod_fini);
94
95MODULE_LICENSE("GPL");
96MODULE_DESCRIPTION("LZ4 Compression Algorithm");
97MODULE_ALIAS_CRYPTO("lz4");