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Linux/crypto/lz4hc.c

  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         size_t tmp_len = *dlen;
 69         int err;
 70 
 71         err = lz4hc_compress(src, slen, dst, &tmp_len, ctx);
 72 
 73         if (err < 0)
 74                 return -EINVAL;
 75 
 76         *dlen = tmp_len;
 77         return 0;
 78 }
 79 
 80 static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
 81                            unsigned int slen, u8 *dst, unsigned int *dlen,
 82                            void *ctx)
 83 {
 84         return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
 85 }
 86 
 87 static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
 88                                  unsigned int slen, u8 *dst,
 89                                  unsigned int *dlen)
 90 {
 91         struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
 92 
 93         return __lz4hc_compress_crypto(src, slen, dst, dlen,
 94                                         ctx->lz4hc_comp_mem);
 95 }
 96 
 97 static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
 98                                      u8 *dst, unsigned int *dlen, void *ctx)
 99 {
100         int err;
101         size_t tmp_len = *dlen;
102         size_t __slen = slen;
103 
104         err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
105         if (err < 0)
106                 return -EINVAL;
107 
108         *dlen = tmp_len;
109         return err;
110 }
111 
112 static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
113                              unsigned int slen, u8 *dst, unsigned int *dlen,
114                              void *ctx)
115 {
116         return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
117 }
118 
119 static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
120                                    unsigned int slen, u8 *dst,
121                                    unsigned int *dlen)
122 {
123         return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
124 }
125 
126 static struct crypto_alg alg_lz4hc = {
127         .cra_name               = "lz4hc",
128         .cra_flags              = CRYPTO_ALG_TYPE_COMPRESS,
129         .cra_ctxsize            = sizeof(struct lz4hc_ctx),
130         .cra_module             = THIS_MODULE,
131         .cra_list               = LIST_HEAD_INIT(alg_lz4hc.cra_list),
132         .cra_init               = lz4hc_init,
133         .cra_exit               = lz4hc_exit,
134         .cra_u                  = { .compress = {
135         .coa_compress           = lz4hc_compress_crypto,
136         .coa_decompress         = lz4hc_decompress_crypto } }
137 };
138 
139 static struct scomp_alg scomp = {
140         .alloc_ctx              = lz4hc_alloc_ctx,
141         .free_ctx               = lz4hc_free_ctx,
142         .compress               = lz4hc_scompress,
143         .decompress             = lz4hc_sdecompress,
144         .base                   = {
145                 .cra_name       = "lz4hc",
146                 .cra_driver_name = "lz4hc-scomp",
147                 .cra_module      = THIS_MODULE,
148         }
149 };
150 
151 static int __init lz4hc_mod_init(void)
152 {
153         int ret;
154 
155         ret = crypto_register_alg(&alg_lz4hc);
156         if (ret)
157                 return ret;
158 
159         ret = crypto_register_scomp(&scomp);
160         if (ret) {
161                 crypto_unregister_alg(&alg_lz4hc);
162                 return ret;
163         }
164 
165         return ret;
166 }
167 
168 static void __exit lz4hc_mod_fini(void)
169 {
170         crypto_unregister_alg(&alg_lz4hc);
171         crypto_unregister_scomp(&scomp);
172 }
173 
174 module_init(lz4hc_mod_init);
175 module_exit(lz4hc_mod_fini);
176 
177 MODULE_LICENSE("GPL");
178 MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
179 MODULE_ALIAS_CRYPTO("lz4hc");
180 

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