Blame view
crypto/lz4hc.c
2.54 KB
0ea8530dc
crypto: add lz4 C...
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 |
/*
* Cryptographic API.
*
* Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/lz4.h>
struct lz4hc_ctx {
void *lz4hc_comp_mem;
};
static int lz4hc_init(struct crypto_tfm *tfm)
{
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->lz4hc_comp_mem = vmalloc(LZ4HC_MEM_COMPRESS);
if (!ctx->lz4hc_comp_mem)
return -ENOMEM;
return 0;
}
static void lz4hc_exit(struct crypto_tfm *tfm)
{
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
vfree(ctx->lz4hc_comp_mem);
}
static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
size_t tmp_len = *dlen;
int err;
err = lz4hc_compress(src, slen, dst, &tmp_len, ctx->lz4hc_comp_mem);
if (err < 0)
return -EINVAL;
*dlen = tmp_len;
return 0;
}
static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
int err;
size_t tmp_len = *dlen;
size_t __slen = slen;
err = lz4_decompress(src, &__slen, dst, tmp_len);
if (err < 0)
return -EINVAL;
*dlen = tmp_len;
return err;
}
static struct crypto_alg alg_lz4hc = {
.cra_name = "lz4hc",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
.cra_ctxsize = sizeof(struct lz4hc_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
.cra_init = lz4hc_init,
.cra_exit = lz4hc_exit,
.cra_u = { .compress = {
.coa_compress = lz4hc_compress_crypto,
.coa_decompress = lz4hc_decompress_crypto } }
};
static int __init lz4hc_mod_init(void)
{
return crypto_register_alg(&alg_lz4hc);
}
static void __exit lz4hc_mod_fini(void)
{
crypto_unregister_alg(&alg_lz4hc);
}
module_init(lz4hc_mod_init);
module_exit(lz4hc_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
|