1 // SPDX-License-Identifier: GPL-2.0-only
6 #include <linux/init.h>
7 #include <linux/module.h>
8 #include <linux/crypto.h>
9 #include <linux/vmalloc.h>
11 #include <linux/lzo.h>
12 #include <crypto/internal/scompress.h>
15 void *lzorle_comp_mem;
18 static void *lzorle_alloc_ctx(struct crypto_scomp *tfm)
22 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
24 return ERR_PTR(-ENOMEM);
29 static int lzorle_init(struct crypto_tfm *tfm)
31 struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
33 ctx->lzorle_comp_mem = lzorle_alloc_ctx(NULL);
34 if (IS_ERR(ctx->lzorle_comp_mem))
40 static void lzorle_free_ctx(struct crypto_scomp *tfm, void *ctx)
45 static void lzorle_exit(struct crypto_tfm *tfm)
47 struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
49 lzorle_free_ctx(NULL, ctx->lzorle_comp_mem);
52 static int __lzorle_compress(const u8 *src, unsigned int slen,
53 u8 *dst, unsigned int *dlen, void *ctx)
55 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
58 err = lzorle1x_1_compress(src, slen, dst, &tmp_len, ctx);
67 static int lzorle_compress(struct crypto_tfm *tfm, const u8 *src,
68 unsigned int slen, u8 *dst, unsigned int *dlen)
70 struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
72 return __lzorle_compress(src, slen, dst, dlen, ctx->lzorle_comp_mem);
75 static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src,
76 unsigned int slen, u8 *dst, unsigned int *dlen,
79 return __lzorle_compress(src, slen, dst, dlen, ctx);
82 static int __lzorle_decompress(const u8 *src, unsigned int slen,
83 u8 *dst, unsigned int *dlen)
86 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
88 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
97 static int lzorle_decompress(struct crypto_tfm *tfm, const u8 *src,
98 unsigned int slen, u8 *dst, unsigned int *dlen)
100 return __lzorle_decompress(src, slen, dst, dlen);
103 static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src,
104 unsigned int slen, u8 *dst, unsigned int *dlen,
107 return __lzorle_decompress(src, slen, dst, dlen);
110 static 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 } }
123 static struct scomp_alg scomp = {
124 .alloc_ctx = lzorle_alloc_ctx,
125 .free_ctx = lzorle_free_ctx,
126 .compress = lzorle_scompress,
127 .decompress = lzorle_sdecompress,
129 .cra_name = "lzo-rle",
130 .cra_driver_name = "lzo-rle-scomp",
131 .cra_module = THIS_MODULE,
135 static int __init lzorle_mod_init(void)
139 ret = crypto_register_alg(&alg);
143 ret = crypto_register_scomp(&scomp);
145 crypto_unregister_alg(&alg);
152 static void __exit lzorle_mod_fini(void)
154 crypto_unregister_alg(&alg);
155 crypto_unregister_scomp(&scomp);
158 subsys_initcall(lzorle_mod_init);
159 module_exit(lzorle_mod_fini);
161 MODULE_LICENSE("GPL");
162 MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
163 MODULE_ALIAS_CRYPTO("lzo-rle");