diff options
Diffstat (limited to 'crypto/lz4.c')
| -rw-r--r-- | crypto/lz4.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/crypto/lz4.c b/crypto/lz4.c new file mode 100644 index 000000000..2ce2660d3 --- /dev/null +++ b/crypto/lz4.c @@ -0,0 +1,173 @@ +/* + * Cryptographic API. + * + * Copyright (c) 2013 Chanho Min <chanho.min@lge.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/crypto.h> +#include <linux/vmalloc.h> +#include <linux/lz4.h> +#include <crypto/internal/scompress.h> + +struct lz4_ctx { + void *lz4_comp_mem; +}; + +static void *lz4_alloc_ctx(struct crypto_scomp *tfm) +{ + void *ctx; + + ctx = vmalloc(LZ4_MEM_COMPRESS); + if (!ctx) + return ERR_PTR(-ENOMEM); + + return ctx; +} + +static int lz4_init(struct crypto_tfm *tfm) +{ + struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); + + ctx->lz4_comp_mem = lz4_alloc_ctx(NULL); + if (IS_ERR(ctx->lz4_comp_mem)) + return -ENOMEM; + + return 0; +} + +static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx) +{ + vfree(ctx); +} + +static void lz4_exit(struct crypto_tfm *tfm) +{ + struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); + + lz4_free_ctx(NULL, ctx->lz4_comp_mem); +} + +static int __lz4_compress_crypto(const u8 *src, unsigned int slen, + u8 *dst, unsigned int *dlen, void *ctx) +{ + int out_len = LZ4_compress_default(src, dst, + slen, *dlen, ctx); + + if (!out_len) + return -EINVAL; + + *dlen = out_len; + return 0; +} + +static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen, + void *ctx) +{ + return __lz4_compress_crypto(src, slen, dst, dlen, ctx); +} + +static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen) +{ + struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); + + return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem); +} + +static int __lz4_decompress_crypto(const u8 *src, unsigned int slen, + u8 *dst, unsigned int *dlen, void *ctx) +{ + int out_len = LZ4_decompress_safe(src, dst, slen, *dlen); + + if (out_len < 0) + return -EINVAL; + + *dlen = out_len; + return 0; +} + +static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen, + void *ctx) +{ + return __lz4_decompress_crypto(src, slen, dst, dlen, NULL); +} + +static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, + unsigned int *dlen) +{ + return __lz4_decompress_crypto(src, slen, dst, dlen, NULL); +} + +static struct crypto_alg alg_lz4 = { + .cra_name = "lz4", + .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, + .cra_ctxsize = sizeof(struct lz4_ctx), + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(alg_lz4.cra_list), + .cra_init = lz4_init, + .cra_exit = lz4_exit, + .cra_u = { .compress = { + .coa_compress = lz4_compress_crypto, + .coa_decompress = lz4_decompress_crypto } } +}; + +static struct scomp_alg scomp = { + .alloc_ctx = lz4_alloc_ctx, + .free_ctx = lz4_free_ctx, + .compress = lz4_scompress, + .decompress = lz4_sdecompress, + .base = { + .cra_name = "lz4", + .cra_driver_name = "lz4-scomp", + .cra_module = THIS_MODULE, + } +}; + +static int __init lz4_mod_init(void) +{ + int ret; + + ret = crypto_register_alg(&alg_lz4); + if (ret) + return ret; + + ret = crypto_register_scomp(&scomp); + if (ret) { + crypto_unregister_alg(&alg_lz4); + return ret; + } + + return ret; +} + +static void __exit lz4_mod_fini(void) +{ + crypto_unregister_alg(&alg_lz4); + crypto_unregister_scomp(&scomp); +} + +module_init(lz4_mod_init); +module_exit(lz4_mod_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("LZ4 Compression Algorithm"); +MODULE_ALIAS_CRYPTO("lz4"); |