projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 0ea8530d CM |
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 | ||
| 21 | #include <linux/init.h> | |
| 22 | #include <linux/module.h> | |
| 23 | #include <linux/crypto.h> | |
| 24 | #include <linux/vmalloc.h> | |
| 25 | #include <linux/lz4.h> | |
| 26 | ||
| 27 | struct lz4_ctx { | |
| 28 | void *lz4_comp_mem; | |
| 29 | }; | |
| 30 | ||
| 31 | static int lz4_init(struct crypto_tfm *tfm) | |
| 32 | { | |
| 33 | struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); | |
| 34 | ||
| 35 | ctx->lz4_comp_mem = vmalloc(LZ4_MEM_COMPRESS); | |
| 36 | if (!ctx->lz4_comp_mem) | |
| 37 | return -ENOMEM; | |
| 38 | ||
| 39 | return 0; | |
| 40 | } | |
| 41 | ||
| 42 | static void lz4_exit(struct crypto_tfm *tfm) | |
| 43 | { | |
| 44 | struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); | |
| 45 | vfree(ctx->lz4_comp_mem); | |
| 46 | } | |
| 47 | ||
| 48 | static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src, | |
| 49 | unsigned int slen, u8 *dst, unsigned int *dlen) | |
| 50 | { | |
| 51 | struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); | |
| 52 | size_t tmp_len = *dlen; | |
| 53 | int err; | |
| 54 | ||
| 55 | err = lz4_compress(src, slen, dst, &tmp_len, ctx->lz4_comp_mem); | |
| 56 | ||
| 57 | if (err < 0) | |
| 58 | return -EINVAL; | |
| 59 | ||
| 60 | *dlen = tmp_len; | |
| 61 | return 0; | |
| 62 | } | |
| 63 | ||
| 64 | static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src, | |
| 65 | unsigned int slen, u8 *dst, unsigned int *dlen) | |
| 66 | { | |
| 67 | int err; | |
| 68 | size_t tmp_len = *dlen; | |
| 69 | size_t __slen = slen; | |
| 70 | ||
| 71 | err = lz4_decompress(src, &__slen, dst, tmp_len); | |
| 72 | if (err < 0) | |
| 73 | return -EINVAL; | |
| 74 | ||
| 75 | *dlen = tmp_len; | |
| 76 | return err; | |
| 77 | } | |
| 78 | ||
| 79 | static struct crypto_alg alg_lz4 = { | |
| 80 | .cra_name = "lz4", | |
| 81 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, | |
| 82 | .cra_ctxsize = sizeof(struct lz4_ctx), | |
| 83 | .cra_module = THIS_MODULE, | |
| 84 | .cra_list = LIST_HEAD_INIT(alg_lz4.cra_list), | |
| 85 | .cra_init = lz4_init, | |
| 86 | .cra_exit = lz4_exit, | |
| 87 | .cra_u = { .compress = { | |
| 88 | .coa_compress = lz4_compress_crypto, | |
| 89 | .coa_decompress = lz4_decompress_crypto } } | |
| 90 | }; | |
| 91 | ||
| 92 | static int __init lz4_mod_init(void) | |
| 93 | { | |
| 94 | return crypto_register_alg(&alg_lz4); | |
| 95 | } | |
| 96 | ||
| 97 | static void __exit lz4_mod_fini(void) | |
| 98 | { | |
| 99 | crypto_unregister_alg(&alg_lz4); | |
| 100 | } | |
| 101 | ||
| 102 | module_init(lz4_mod_init); | |
| 103 | module_exit(lz4_mod_fini); | |
| 104 | ||
| 105 | MODULE_LICENSE("GPL"); | |
| 106 | MODULE_DESCRIPTION("LZ4 Compression Algorithm"); |