cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

lzo-rle.c (3526B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Cryptographic API.
      4 */
      5
      6#include <linux/init.h>
      7#include <linux/module.h>
      8#include <linux/crypto.h>
      9#include <linux/vmalloc.h>
     10#include <linux/mm.h>
     11#include <linux/lzo.h>
     12#include <crypto/internal/scompress.h>
     13
     14struct lzorle_ctx {
     15	void *lzorle_comp_mem;
     16};
     17
     18static void *lzorle_alloc_ctx(struct crypto_scomp *tfm)
     19{
     20	void *ctx;
     21
     22	ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
     23	if (!ctx)
     24		return ERR_PTR(-ENOMEM);
     25
     26	return ctx;
     27}
     28
     29static int lzorle_init(struct crypto_tfm *tfm)
     30{
     31	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
     32
     33	ctx->lzorle_comp_mem = lzorle_alloc_ctx(NULL);
     34	if (IS_ERR(ctx->lzorle_comp_mem))
     35		return -ENOMEM;
     36
     37	return 0;
     38}
     39
     40static void lzorle_free_ctx(struct crypto_scomp *tfm, void *ctx)
     41{
     42	kvfree(ctx);
     43}
     44
     45static void lzorle_exit(struct crypto_tfm *tfm)
     46{
     47	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
     48
     49	lzorle_free_ctx(NULL, ctx->lzorle_comp_mem);
     50}
     51
     52static int __lzorle_compress(const u8 *src, unsigned int slen,
     53			  u8 *dst, unsigned int *dlen, void *ctx)
     54{
     55	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
     56	int err;
     57
     58	err = lzorle1x_1_compress(src, slen, dst, &tmp_len, ctx);
     59
     60	if (err != LZO_E_OK)
     61		return -EINVAL;
     62
     63	*dlen = tmp_len;
     64	return 0;
     65}
     66
     67static int lzorle_compress(struct crypto_tfm *tfm, const u8 *src,
     68			unsigned int slen, u8 *dst, unsigned int *dlen)
     69{
     70	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
     71
     72	return __lzorle_compress(src, slen, dst, dlen, ctx->lzorle_comp_mem);
     73}
     74
     75static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src,
     76			 unsigned int slen, u8 *dst, unsigned int *dlen,
     77			 void *ctx)
     78{
     79	return __lzorle_compress(src, slen, dst, dlen, ctx);
     80}
     81
     82static int __lzorle_decompress(const u8 *src, unsigned int slen,
     83			    u8 *dst, unsigned int *dlen)
     84{
     85	int err;
     86	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
     87
     88	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
     89
     90	if (err != LZO_E_OK)
     91		return -EINVAL;
     92
     93	*dlen = tmp_len;
     94	return 0;
     95}
     96
     97static int lzorle_decompress(struct crypto_tfm *tfm, const u8 *src,
     98			  unsigned int slen, u8 *dst, unsigned int *dlen)
     99{
    100	return __lzorle_decompress(src, slen, dst, dlen);
    101}
    102
    103static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src,
    104			   unsigned int slen, u8 *dst, unsigned int *dlen,
    105			   void *ctx)
    106{
    107	return __lzorle_decompress(src, slen, dst, dlen);
    108}
    109
    110static struct crypto_alg alg = {
    111	.cra_name		= "lzo-rle",
    112	.cra_driver_name	= "lzo-rle-generic",
    113	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
    114	.cra_ctxsize		= sizeof(struct lzorle_ctx),
    115	.cra_module		= THIS_MODULE,
    116	.cra_init		= lzorle_init,
    117	.cra_exit		= lzorle_exit,
    118	.cra_u			= { .compress = {
    119	.coa_compress		= lzorle_compress,
    120	.coa_decompress		= lzorle_decompress } }
    121};
    122
    123static struct scomp_alg scomp = {
    124	.alloc_ctx		= lzorle_alloc_ctx,
    125	.free_ctx		= lzorle_free_ctx,
    126	.compress		= lzorle_scompress,
    127	.decompress		= lzorle_sdecompress,
    128	.base			= {
    129		.cra_name	= "lzo-rle",
    130		.cra_driver_name = "lzo-rle-scomp",
    131		.cra_module	 = THIS_MODULE,
    132	}
    133};
    134
    135static int __init lzorle_mod_init(void)
    136{
    137	int ret;
    138
    139	ret = crypto_register_alg(&alg);
    140	if (ret)
    141		return ret;
    142
    143	ret = crypto_register_scomp(&scomp);
    144	if (ret) {
    145		crypto_unregister_alg(&alg);
    146		return ret;
    147	}
    148
    149	return ret;
    150}
    151
    152static void __exit lzorle_mod_fini(void)
    153{
    154	crypto_unregister_alg(&alg);
    155	crypto_unregister_scomp(&scomp);
    156}
    157
    158subsys_initcall(lzorle_mod_init);
    159module_exit(lzorle_mod_fini);
    160
    161MODULE_LICENSE("GPL");
    162MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
    163MODULE_ALIAS_CRYPTO("lzo-rle");