tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Cryptographic API.
4 */
5
6#include <crypto/internal/scompress.h>
7#include <linux/init.h>
8#include <linux/lzo.h>
9#include <linux/module.h>
10#include <linux/slab.h>
11
12static void *lzo_alloc_ctx(void)
13{
14 void *ctx;
15
16 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
17 if (!ctx)
18 return ERR_PTR(-ENOMEM);
19
20 return ctx;
21}
22
23static void lzo_free_ctx(void *ctx)
24{
25 kvfree(ctx);
26}
27
28static int __lzo_compress(const u8 *src, unsigned int slen,
29 u8 *dst, unsigned int *dlen, void *ctx)
30{
31 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
32 int err;
33
34 err = lzo1x_1_compress_safe(src, slen, dst, &tmp_len, ctx);
35
36 if (err != LZO_E_OK)
37 return -EINVAL;
38
39 *dlen = tmp_len;
40 return 0;
41}
42
43static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
44 unsigned int slen, u8 *dst, unsigned int *dlen,
45 void *ctx)
46{
47 return __lzo_compress(src, slen, dst, dlen, ctx);
48}
49
50static int __lzo_decompress(const u8 *src, unsigned int slen,
51 u8 *dst, unsigned int *dlen)
52{
53 int err;
54 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
55
56 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
57
58 if (err != LZO_E_OK)
59 return -EINVAL;
60
61 *dlen = tmp_len;
62 return 0;
63}
64
65static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
66 unsigned int slen, u8 *dst, unsigned int *dlen,
67 void *ctx)
68{
69 return __lzo_decompress(src, slen, dst, dlen);
70}
71
72static struct scomp_alg scomp = {
73 .alloc_ctx = lzo_alloc_ctx,
74 .free_ctx = lzo_free_ctx,
75 .compress = lzo_scompress,
76 .decompress = lzo_sdecompress,
77 .base = {
78 .cra_name = "lzo",
79 .cra_driver_name = "lzo-scomp",
80 .cra_module = THIS_MODULE,
81 }
82};
83
84static int __init lzo_mod_init(void)
85{
86 return crypto_register_scomp(&scomp);
87}
88
89static void __exit lzo_mod_fini(void)
90{
91 crypto_unregister_scomp(&scomp);
92}
93
94module_init(lzo_mod_init);
95module_exit(lzo_mod_fini);
96
97MODULE_LICENSE("GPL");
98MODULE_DESCRIPTION("LZO Compression Algorithm");
99MODULE_ALIAS_CRYPTO("lzo");