1 /*
2 * Cryptographic API.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16 *
17 */
18
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/crypto.h>
22 #include <linux/vmalloc.h>
23 #include <linux/mm.h>
24 #include <linux/lzo.h>
25 #include <crypto/internal/scompress.h>
26
27 struct lzo_ctx {
28 void *lzo_comp_mem;
29 };
30
lzo_alloc_ctx(struct crypto_scomp * tfm)31 static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
32 {
33 void *ctx;
34
35 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
36 if (!ctx)
37 return ERR_PTR(-ENOMEM);
38
39 return ctx;
40 }
41
lzo_init(struct crypto_tfm * tfm)42 static int lzo_init(struct crypto_tfm *tfm)
43 {
44 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
45
46 ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
47 if (IS_ERR(ctx->lzo_comp_mem))
48 return -ENOMEM;
49
50 return 0;
51 }
52
lzo_free_ctx(struct crypto_scomp * tfm,void * ctx)53 static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
54 {
55 kvfree(ctx);
56 }
57
lzo_exit(struct crypto_tfm * tfm)58 static void lzo_exit(struct crypto_tfm *tfm)
59 {
60 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
61
62 lzo_free_ctx(NULL, ctx->lzo_comp_mem);
63 }
64
__lzo_compress(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)65 static int __lzo_compress(const u8 *src, unsigned int slen,
66 u8 *dst, unsigned int *dlen, void *ctx)
67 {
68 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
69 int err;
70
71 err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
72
73 if (err != LZO_E_OK)
74 return -EINVAL;
75
76 *dlen = tmp_len;
77 return 0;
78 }
79
lzo_compress(struct crypto_tfm * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)80 static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
81 unsigned int slen, u8 *dst, unsigned int *dlen)
82 {
83 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
84
85 return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
86 }
87
lzo_scompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)88 static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
89 unsigned int slen, u8 *dst, unsigned int *dlen,
90 void *ctx)
91 {
92 return __lzo_compress(src, slen, dst, dlen, ctx);
93 }
94
__lzo_decompress(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)95 static int __lzo_decompress(const u8 *src, unsigned int slen,
96 u8 *dst, unsigned int *dlen)
97 {
98 int err;
99 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
100
101 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
102
103 if (err != LZO_E_OK)
104 return -EINVAL;
105
106 *dlen = tmp_len;
107 return 0;
108 }
109
lzo_decompress(struct crypto_tfm * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)110 static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
111 unsigned int slen, u8 *dst, unsigned int *dlen)
112 {
113 return __lzo_decompress(src, slen, dst, dlen);
114 }
115
lzo_sdecompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)116 static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
117 unsigned int slen, u8 *dst, unsigned int *dlen,
118 void *ctx)
119 {
120 return __lzo_decompress(src, slen, dst, dlen);
121 }
122
123 static struct crypto_alg alg = {
124 .cra_name = "lzo",
125 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
126 .cra_ctxsize = sizeof(struct lzo_ctx),
127 .cra_module = THIS_MODULE,
128 .cra_init = lzo_init,
129 .cra_exit = lzo_exit,
130 .cra_u = { .compress = {
131 .coa_compress = lzo_compress,
132 .coa_decompress = lzo_decompress } }
133 };
134
135 static struct scomp_alg scomp = {
136 .alloc_ctx = lzo_alloc_ctx,
137 .free_ctx = lzo_free_ctx,
138 .compress = lzo_scompress,
139 .decompress = lzo_sdecompress,
140 .base = {
141 .cra_name = "lzo",
142 .cra_driver_name = "lzo-scomp",
143 .cra_module = THIS_MODULE,
144 }
145 };
146
lzo_mod_init(void)147 static int __init lzo_mod_init(void)
148 {
149 int ret;
150
151 ret = crypto_register_alg(&alg);
152 if (ret)
153 return ret;
154
155 ret = crypto_register_scomp(&scomp);
156 if (ret) {
157 crypto_unregister_alg(&alg);
158 return ret;
159 }
160
161 return ret;
162 }
163
lzo_mod_fini(void)164 static void __exit lzo_mod_fini(void)
165 {
166 crypto_unregister_alg(&alg);
167 crypto_unregister_scomp(&scomp);
168 }
169
170 module_init(lzo_mod_init);
171 module_exit(lzo_mod_fini);
172
173 MODULE_LICENSE("GPL");
174 MODULE_DESCRIPTION("LZO Compression Algorithm");
175 MODULE_ALIAS_CRYPTO("lzo");
176
