107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
|
/*
|
||
|
|
* 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 lz4_ctx {
|
||
|
|
void *lz4_comp_mem;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int lz4_init(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
|
||
|
|
ctx->lz4_comp_mem = vmalloc(LZ4_MEM_COMPRESS);
|
||
|
|
if (!ctx->lz4_comp_mem)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void lz4_exit(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
vfree(ctx->lz4_comp_mem);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
|
||
|
|
unsigned int slen, u8 *dst, unsigned int *dlen)
|
||
|
|
{
|
||
|
|
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
size_t tmp_len = *dlen;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = lz4_compress(src, slen, dst, &tmp_len, ctx->lz4_comp_mem);
|
||
|
|
|
||
|
|
if (err < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
*dlen = tmp_len;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lz4_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_lz4 = {
|
||
|
|
.cra_name = "lz4",
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
|
||
|
|
.cra_ctxsize = sizeof(struct lz4_ctx),
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_list = LIST_HEAD_INIT(alg_lz4.cra_list),
|
||
|
|
.cra_init = lz4_init,
|
||
|
|
.cra_exit = lz4_exit,
|
||
|
|
.cra_u = { .compress = {
|
||
|
|
.coa_compress = lz4_compress_crypto,
|
||
|
|
.coa_decompress = lz4_decompress_crypto } }
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init lz4_mod_init(void)
|
||
|
|
{
|
||
|
|
return crypto_register_alg(&alg_lz4);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit lz4_mod_fini(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_alg(&alg_lz4);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(lz4_mod_init);
|
||
|
|
module_exit(lz4_mod_fini);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("LZ4 Compression Algorithm");
|