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![Giovanni Cabiddu](/assets/img/avatar_default.png)
Add scomp backend for lz4hc compression algorithm. Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/*
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* Cryptographic API.
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*
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* Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/crypto.h>
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#include <linux/vmalloc.h>
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#include <linux/lz4.h>
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#include <crypto/internal/scompress.h>
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struct lz4hc_ctx {
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void *lz4hc_comp_mem;
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};
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static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
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{
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void *ctx;
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ctx = vmalloc(LZ4HC_MEM_COMPRESS);
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if (!ctx)
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return ERR_PTR(-ENOMEM);
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return ctx;
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}
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static int lz4hc_init(struct crypto_tfm *tfm)
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{
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struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
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ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
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if (IS_ERR(ctx->lz4hc_comp_mem))
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return -ENOMEM;
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return 0;
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}
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static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
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{
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vfree(ctx);
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}
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static void lz4hc_exit(struct crypto_tfm *tfm)
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{
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struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
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lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
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}
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static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
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u8 *dst, unsigned int *dlen, void *ctx)
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{
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size_t tmp_len = *dlen;
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int err;
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err = lz4hc_compress(src, slen, dst, &tmp_len, ctx);
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if (err < 0)
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return -EINVAL;
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*dlen = tmp_len;
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return 0;
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}
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static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen,
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void *ctx)
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{
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return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
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}
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static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst,
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unsigned int *dlen)
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{
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struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
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return __lz4hc_compress_crypto(src, slen, dst, dlen,
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ctx->lz4hc_comp_mem);
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}
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static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
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u8 *dst, unsigned int *dlen, void *ctx)
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{
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int err;
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size_t tmp_len = *dlen;
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size_t __slen = slen;
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err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
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if (err < 0)
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return -EINVAL;
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*dlen = tmp_len;
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return err;
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}
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static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen,
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void *ctx)
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{
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return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
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}
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static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst,
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unsigned int *dlen)
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{
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return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
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}
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static struct crypto_alg alg_lz4hc = {
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.cra_name = "lz4hc",
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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.cra_ctxsize = sizeof(struct lz4hc_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
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.cra_init = lz4hc_init,
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.cra_exit = lz4hc_exit,
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.cra_u = { .compress = {
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.coa_compress = lz4hc_compress_crypto,
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.coa_decompress = lz4hc_decompress_crypto } }
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};
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static struct scomp_alg scomp = {
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.alloc_ctx = lz4hc_alloc_ctx,
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.free_ctx = lz4hc_free_ctx,
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.compress = lz4hc_scompress,
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.decompress = lz4hc_sdecompress,
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.base = {
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.cra_name = "lz4hc",
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.cra_driver_name = "lz4hc-scomp",
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.cra_module = THIS_MODULE,
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}
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};
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static int __init lz4hc_mod_init(void)
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{
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int ret;
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ret = crypto_register_alg(&alg_lz4hc);
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if (ret)
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return ret;
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ret = crypto_register_scomp(&scomp);
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if (ret) {
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crypto_unregister_alg(&alg_lz4hc);
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return ret;
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}
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return ret;
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}
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static void __exit lz4hc_mod_fini(void)
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{
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crypto_unregister_alg(&alg_lz4hc);
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crypto_unregister_scomp(&scomp);
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}
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module_init(lz4hc_mod_init);
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module_exit(lz4hc_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
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MODULE_ALIAS_CRYPTO("lz4hc");
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