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TOMOYO Linux Cross Reference
Linux/crypto/lz4hc.c

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  1 /*
  2  * Cryptographic API.
  3  *
  4  * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License version 2 as published by
  8  * the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13  * more details.
 14  *
 15  * You should have received a copy of the GNU General Public License along with
 16  * this program; if not, write to the Free Software Foundation, Inc., 51
 17  * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 18  *
 19  */
 20 #include <linux/init.h>
 21 #include <linux/module.h>
 22 #include <linux/crypto.h>
 23 #include <linux/vmalloc.h>
 24 #include <linux/lz4.h>
 25 #include <crypto/internal/scompress.h>
 26 
 27 struct lz4hc_ctx {
 28         void *lz4hc_comp_mem;
 29 };
 30 
 31 static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
 32 {
 33         void *ctx;
 34 
 35         ctx = vmalloc(LZ4HC_MEM_COMPRESS);
 36         if (!ctx)
 37                 return ERR_PTR(-ENOMEM);
 38 
 39         return ctx;
 40 }
 41 
 42 static int lz4hc_init(struct crypto_tfm *tfm)
 43 {
 44         struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
 45 
 46         ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
 47         if (IS_ERR(ctx->lz4hc_comp_mem))
 48                 return -ENOMEM;
 49 
 50         return 0;
 51 }
 52 
 53 static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
 54 {
 55         vfree(ctx);
 56 }
 57 
 58 static void lz4hc_exit(struct crypto_tfm *tfm)
 59 {
 60         struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
 61 
 62         lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
 63 }
 64 
 65 static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
 66                                    u8 *dst, unsigned int *dlen, void *ctx)
 67 {
 68         int out_len = LZ4_compress_HC(src, dst, slen,
 69                 *dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
 70 
 71         if (!out_len)
 72                 return -EINVAL;
 73 
 74         *dlen = out_len;
 75         return 0;
 76 }
 77 
 78 static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
 79                            unsigned int slen, u8 *dst, unsigned int *dlen,
 80                            void *ctx)
 81 {
 82         return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
 83 }
 84 
 85 static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
 86                                  unsigned int slen, u8 *dst,
 87                                  unsigned int *dlen)
 88 {
 89         struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
 90 
 91         return __lz4hc_compress_crypto(src, slen, dst, dlen,
 92                                         ctx->lz4hc_comp_mem);
 93 }
 94 
 95 static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
 96                                      u8 *dst, unsigned int *dlen, void *ctx)
 97 {
 98         int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
 99 
100         if (out_len < 0)
101                 return -EINVAL;
102 
103         *dlen = out_len;
104         return 0;
105 }
106 
107 static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
108                              unsigned int slen, u8 *dst, unsigned int *dlen,
109                              void *ctx)
110 {
111         return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
112 }
113 
114 static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
115                                    unsigned int slen, u8 *dst,
116                                    unsigned int *dlen)
117 {
118         return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
119 }
120 
121 static struct crypto_alg alg_lz4hc = {
122         .cra_name               = "lz4hc",
123         .cra_flags              = CRYPTO_ALG_TYPE_COMPRESS,
124         .cra_ctxsize            = sizeof(struct lz4hc_ctx),
125         .cra_module             = THIS_MODULE,
126         .cra_list               = LIST_HEAD_INIT(alg_lz4hc.cra_list),
127         .cra_init               = lz4hc_init,
128         .cra_exit               = lz4hc_exit,
129         .cra_u                  = { .compress = {
130         .coa_compress           = lz4hc_compress_crypto,
131         .coa_decompress         = lz4hc_decompress_crypto } }
132 };
133 
134 static struct scomp_alg scomp = {
135         .alloc_ctx              = lz4hc_alloc_ctx,
136         .free_ctx               = lz4hc_free_ctx,
137         .compress               = lz4hc_scompress,
138         .decompress             = lz4hc_sdecompress,
139         .base                   = {
140                 .cra_name       = "lz4hc",
141                 .cra_driver_name = "lz4hc-scomp",
142                 .cra_module      = THIS_MODULE,
143         }
144 };
145 
146 static int __init lz4hc_mod_init(void)
147 {
148         int ret;
149 
150         ret = crypto_register_alg(&alg_lz4hc);
151         if (ret)
152                 return ret;
153 
154         ret = crypto_register_scomp(&scomp);
155         if (ret) {
156                 crypto_unregister_alg(&alg_lz4hc);
157                 return ret;
158         }
159 
160         return ret;
161 }
162 
163 static void __exit lz4hc_mod_fini(void)
164 {
165         crypto_unregister_alg(&alg_lz4hc);
166         crypto_unregister_scomp(&scomp);
167 }
168 
169 module_init(lz4hc_mod_init);
170 module_exit(lz4hc_mod_fini);
171 
172 MODULE_LICENSE("GPL");
173 MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
174 MODULE_ALIAS_CRYPTO("lz4hc");
175 

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