cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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lz4.c (3378B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Cryptographic API.
      4 *
      5 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
      6 */
      7
      8#include <linux/init.h>
      9#include <linux/module.h>
     10#include <linux/crypto.h>
     11#include <linux/vmalloc.h>
     12#include <linux/lz4.h>
     13#include <crypto/internal/scompress.h>
     14
     15struct lz4_ctx {
     16	void *lz4_comp_mem;
     17};
     18
     19static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
     20{
     21	void *ctx;
     22
     23	ctx = vmalloc(LZ4_MEM_COMPRESS);
     24	if (!ctx)
     25		return ERR_PTR(-ENOMEM);
     26
     27	return ctx;
     28}
     29
     30static int lz4_init(struct crypto_tfm *tfm)
     31{
     32	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
     33
     34	ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
     35	if (IS_ERR(ctx->lz4_comp_mem))
     36		return -ENOMEM;
     37
     38	return 0;
     39}
     40
     41static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
     42{
     43	vfree(ctx);
     44}
     45
     46static void lz4_exit(struct crypto_tfm *tfm)
     47{
     48	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
     49
     50	lz4_free_ctx(NULL, ctx->lz4_comp_mem);
     51}
     52
     53static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
     54				 u8 *dst, unsigned int *dlen, void *ctx)
     55{
     56	int out_len = LZ4_compress_default(src, dst,
     57		slen, *dlen, ctx);
     58
     59	if (!out_len)
     60		return -EINVAL;
     61
     62	*dlen = out_len;
     63	return 0;
     64}
     65
     66static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
     67			 unsigned int slen, u8 *dst, unsigned int *dlen,
     68			 void *ctx)
     69{
     70	return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
     71}
     72
     73static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
     74			       unsigned int slen, u8 *dst, unsigned int *dlen)
     75{
     76	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
     77
     78	return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
     79}
     80
     81static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
     82				   u8 *dst, unsigned int *dlen, void *ctx)
     83{
     84	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
     85
     86	if (out_len < 0)
     87		return -EINVAL;
     88
     89	*dlen = out_len;
     90	return 0;
     91}
     92
     93static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
     94			   unsigned int slen, u8 *dst, unsigned int *dlen,
     95			   void *ctx)
     96{
     97	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
     98}
     99
    100static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
    101				 unsigned int slen, u8 *dst,
    102				 unsigned int *dlen)
    103{
    104	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
    105}
    106
    107static struct crypto_alg alg_lz4 = {
    108	.cra_name		= "lz4",
    109	.cra_driver_name	= "lz4-generic",
    110	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
    111	.cra_ctxsize		= sizeof(struct lz4_ctx),
    112	.cra_module		= THIS_MODULE,
    113	.cra_init		= lz4_init,
    114	.cra_exit		= lz4_exit,
    115	.cra_u			= { .compress = {
    116	.coa_compress		= lz4_compress_crypto,
    117	.coa_decompress		= lz4_decompress_crypto } }
    118};
    119
    120static struct scomp_alg scomp = {
    121	.alloc_ctx		= lz4_alloc_ctx,
    122	.free_ctx		= lz4_free_ctx,
    123	.compress		= lz4_scompress,
    124	.decompress		= lz4_sdecompress,
    125	.base			= {
    126		.cra_name	= "lz4",
    127		.cra_driver_name = "lz4-scomp",
    128		.cra_module	 = THIS_MODULE,
    129	}
    130};
    131
    132static int __init lz4_mod_init(void)
    133{
    134	int ret;
    135
    136	ret = crypto_register_alg(&alg_lz4);
    137	if (ret)
    138		return ret;
    139
    140	ret = crypto_register_scomp(&scomp);
    141	if (ret) {
    142		crypto_unregister_alg(&alg_lz4);
    143		return ret;
    144	}
    145
    146	return ret;
    147}
    148
    149static void __exit lz4_mod_fini(void)
    150{
    151	crypto_unregister_alg(&alg_lz4);
    152	crypto_unregister_scomp(&scomp);
    153}
    154
    155subsys_initcall(lz4_mod_init);
    156module_exit(lz4_mod_fini);
    157
    158MODULE_LICENSE("GPL");
    159MODULE_DESCRIPTION("LZ4 Compression Algorithm");
    160MODULE_ALIAS_CRYPTO("lz4");