xref: /openbmc/linux/crypto/lzo.c (revision d6ebf528)
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 
14 struct lzo_ctx {
15 	void *lzo_comp_mem;
16 };
17 
lzo_alloc_ctx(struct crypto_scomp * tfm)18 static void *lzo_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 
lzo_init(struct crypto_tfm * tfm)29 static int lzo_init(struct crypto_tfm *tfm)
30 {
31 	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
32 
33 	ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
34 	if (IS_ERR(ctx->lzo_comp_mem))
35 		return -ENOMEM;
36 
37 	return 0;
38 }
39 
lzo_free_ctx(struct crypto_scomp * tfm,void * ctx)40 static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
41 {
42 	kvfree(ctx);
43 }
44 
lzo_exit(struct crypto_tfm * tfm)45 static void lzo_exit(struct crypto_tfm *tfm)
46 {
47 	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
48 
49 	lzo_free_ctx(NULL, ctx->lzo_comp_mem);
50 }
51 
__lzo_compress(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)52 static int __lzo_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 = lzo1x_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 
lzo_compress(struct crypto_tfm * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)67 static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
68 			unsigned int slen, u8 *dst, unsigned int *dlen)
69 {
70 	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
71 
72 	return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
73 }
74 
lzo_scompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)75 static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
76 			 unsigned int slen, u8 *dst, unsigned int *dlen,
77 			 void *ctx)
78 {
79 	return __lzo_compress(src, slen, dst, dlen, ctx);
80 }
81 
__lzo_decompress(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)82 static int __lzo_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 
lzo_decompress(struct crypto_tfm * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)97 static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
98 			  unsigned int slen, u8 *dst, unsigned int *dlen)
99 {
100 	return __lzo_decompress(src, slen, dst, dlen);
101 }
102 
lzo_sdecompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)103 static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
104 			   unsigned int slen, u8 *dst, unsigned int *dlen,
105 			   void *ctx)
106 {
107 	return __lzo_decompress(src, slen, dst, dlen);
108 }
109 
110 static struct crypto_alg alg = {
111 	.cra_name		= "lzo",
112 	.cra_driver_name	= "lzo-generic",
113 	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
114 	.cra_ctxsize		= sizeof(struct lzo_ctx),
115 	.cra_module		= THIS_MODULE,
116 	.cra_init		= lzo_init,
117 	.cra_exit		= lzo_exit,
118 	.cra_u			= { .compress = {
119 	.coa_compress		= lzo_compress,
120 	.coa_decompress		= lzo_decompress } }
121 };
122 
123 static struct scomp_alg scomp = {
124 	.alloc_ctx		= lzo_alloc_ctx,
125 	.free_ctx		= lzo_free_ctx,
126 	.compress		= lzo_scompress,
127 	.decompress		= lzo_sdecompress,
128 	.base			= {
129 		.cra_name	= "lzo",
130 		.cra_driver_name = "lzo-scomp",
131 		.cra_module	 = THIS_MODULE,
132 	}
133 };
134 
lzo_mod_init(void)135 static int __init lzo_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 
lzo_mod_fini(void)152 static void __exit lzo_mod_fini(void)
153 {
154 	crypto_unregister_alg(&alg);
155 	crypto_unregister_scomp(&scomp);
156 }
157 
158 subsys_initcall(lzo_mod_init);
159 module_exit(lzo_mod_fini);
160 
161 MODULE_LICENSE("GPL");
162 MODULE_DESCRIPTION("LZO Compression Algorithm");
163 MODULE_ALIAS_CRYPTO("lzo");
164