linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Cryptographic API.

 *

 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>

 */

​

#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 lz4_ctx {

    void *lz4_comp_mem;

};

​

static void *lz4_alloc_ctx(struct crypto_scomp *tfm)

{

    void *ctx;

​

    ctx = vmalloc(LZ4_MEM_COMPRESS);

    if (!ctx)

        return ERR_PTR(-ENOMEM);

​

    return ctx;

}

​

static int lz4_init(struct crypto_tfm *tfm)

{

    struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);

​

    ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);

    if (IS_ERR(ctx->lz4_comp_mem))

        return -ENOMEM;

​

    return 0;

}

​

static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)

{

    vfree(ctx);

}

​

static void lz4_exit(struct crypto_tfm *tfm)

{

    struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);

​

    lz4_free_ctx(NULL, ctx->lz4_comp_mem);

}

​

static int __lz4_compress_crypto(const u8 *src, unsigned int slen,

                 u8 *dst, unsigned int *dlen, void *ctx)

{

    int out_len = LZ4_compress_default(src, dst,

        slen, *dlen, ctx);

​

    if (!out_len)

        return -EINVAL;

​

    *dlen = out_len;

    return 0;