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");