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/*
* 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>
#include <crypto/internal/scompress.h>
struct lz4hc_ctx {
void *lz4hc_comp_mem;
};
static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
{
void *ctx;
ctx = vmalloc(LZ4HC_MEM_COMPRESS);
if (!ctx)
return ERR_PTR(-ENOMEM);
return ctx;
}
static int lz4hc_init(struct crypto_tfm *tfm)
{
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
if (IS_ERR(ctx->lz4hc_comp_mem))
return -ENOMEM;
return 0;
}
static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
vfree(ctx);
}
static void lz4hc_exit(struct crypto_tfm *tfm)
{
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
}
static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
int out_len = LZ4_compress_HC(src, dst, slen,
*dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
if (!out_len)
return -EINVAL;
*dlen = out_len;
return 0;
}
static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen,
void *ctx)
{
return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
}
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);
return __lz4hc_compress_crypto(src, slen, dst, dlen,
ctx->lz4hc_comp_mem);
}
static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
if (out_len < 0)
return out_len;
*dlen = out_len;
return 0;
}
static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen,
void *ctx)
{
return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
}
static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst,
unsigned int *dlen)
{
return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
}
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 struct scomp_alg scomp = {
.alloc_ctx = lz4hc_alloc_ctx,
.free_ctx = lz4hc_free_ctx,
.compress = lz4hc_scompress,
.decompress = lz4hc_sdecompress,
.base = {
.cra_name = "lz4hc",
.cra_driver_name = "lz4hc-scomp",
.cra_module = THIS_MODULE,
}
};
static int __init lz4hc_mod_init(void)
{
int ret;
ret = crypto_register_alg(&alg_lz4hc);
if (ret)
return ret;
ret = crypto_register_scomp(&scomp);
if (ret) {
crypto_unregister_alg(&alg_lz4hc);
return ret;
}
return ret;
}
static void __exit lz4hc_mod_fini(void)
{
crypto_unregister_alg(&alg_lz4hc);
crypto_unregister_scomp(&scomp);
}
module_init(lz4hc_mod_init);
module_exit(lz4hc_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
MODULE_ALIAS_CRYPTO("lz4hc");
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