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/*
* Cryptographic API.
*
* Copyright (c) 2017-present, Facebook, Inc.
*
* 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.
*/
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/vmalloc.h>
#include <linux/zstd.h>
#define ZSTD_DEF_LEVEL 3
struct zstd_ctx {
ZSTD_CCtx *cctx;
ZSTD_DCtx *dctx;
void *cwksp;
void *dwksp;
};
static ZSTD_parameters zstd_params(void)
{
return ZSTD_getParams(ZSTD_DEF_LEVEL, 0, 0);
}
static int zstd_comp_init(struct zstd_ctx *ctx)
{
int ret = 0;
const ZSTD_parameters params = zstd_params();
const size_t wksp_size = ZSTD_CCtxWorkspaceBound(params.cParams);
ctx->cwksp = vzalloc(wksp_size);
if (!ctx->cwksp) {
ret = -ENOMEM;
goto out;
}
ctx->cctx = ZSTD_initCCtx(ctx->cwksp, wksp_size);
if (!ctx->cctx) {
ret = -EINVAL;
goto out_free;
}
out:
return ret;
out_free:
vfree(ctx->cwksp);
goto out;
}
static int zstd_decomp_init(struct zstd_ctx *ctx)
{
int ret = 0;
const size_t wksp_size = ZSTD_DCtxWorkspaceBound();
ctx->dwksp = vzalloc(wksp_size);
if (!ctx->dwksp) {
ret = -ENOMEM;
goto out;
}
ctx->dctx = ZSTD_initDCtx(ctx->dwksp, wksp_size);
if (!ctx->dctx) {
ret = -EINVAL;
goto out_free;
}
out:
return ret;
out_free:
vfree(ctx->dwksp);
goto out;
}
static void zstd_comp_exit(struct zstd_ctx *ctx)
{
vfree(ctx->cwksp);
ctx->cwksp = NULL;
ctx->cctx = NULL;
}
static void zstd_decomp_exit(struct zstd_ctx *ctx)
{
vfree(ctx->dwksp);
ctx->dwksp = NULL;
ctx->dctx = NULL;
}
static int __zstd_init(void *ctx)
{
int ret;
ret = zstd_comp_init(ctx);
if (ret)
return ret;
ret = zstd_decomp_init(ctx);
if (ret)
zstd_comp_exit(ctx);
return ret;
}
static int zstd_init(struct crypto_tfm *tfm)
{
struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
return __zstd_init(ctx);
}
static void __zstd_exit(void *ctx)
{
zstd_comp_exit(ctx);
zstd_decomp_exit(ctx);
}
static void zstd_exit(struct crypto_tfm *tfm)
{
struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
__zstd_exit(ctx);
}
static int __zstd_compress(const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
size_t out_len;
struct zstd_ctx *zctx = ctx;
const ZSTD_parameters params = zstd_params();
out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, params);
if (ZSTD_isError(out_len))
return -EINVAL;
*dlen = out_len;
return 0;
}
static int zstd_compress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
return __zstd_compress(src, slen, dst, dlen, ctx);
}
static int __zstd_decompress(const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
size_t out_len;
struct zstd_ctx *zctx = ctx;
out_len = ZSTD_decompressDCtx(zctx->dctx, dst, *dlen, src, slen);
if (ZSTD_isError(out_len))
return -EINVAL;
*dlen = out_len;
return 0;
}
static int zstd_decompress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
return __zstd_decompress(src, slen, dst, dlen, ctx);
}
static struct crypto_alg alg = {
.cra_name = "zstd",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
.cra_ctxsize = sizeof(struct zstd_ctx),
.cra_module = THIS_MODULE,
.cra_init = zstd_init,
.cra_exit = zstd_exit,
.cra_u = { .compress = {
.coa_compress = zstd_compress,
.coa_decompress = zstd_decompress } }
};
static int __init zstd_mod_init(void)
{
int ret;
ret = crypto_register_alg(&alg);
if (ret)
return ret;
return ret;
}
static void __exit zstd_mod_fini(void)
{
crypto_unregister_alg(&alg);
}
module_init(zstd_mod_init);
module_exit(zstd_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Zstd Compression Algorithm");
MODULE_ALIAS_CRYPTO("zstd");
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