108 lines
2.5 KiB
C
108 lines
2.5 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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struct lz4_ctx {
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void *lz4_comp_mem;
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};
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static int lz4_init(struct crypto_tfm *tfm)
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{
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struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
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ctx->lz4_comp_mem = vmalloc(LZ4_MEM_COMPRESS);
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if (!ctx->lz4_comp_mem)
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return -ENOMEM;
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return 0;
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}
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static void lz4_exit(struct crypto_tfm *tfm)
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{
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struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
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vfree(ctx->lz4_comp_mem);
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}
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static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen)
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{
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struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
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size_t tmp_len = *dlen;
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int err;
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err = lz4_compress(src, slen, dst, &tmp_len, ctx->lz4_comp_mem);
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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 lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen)
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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 struct crypto_alg alg_lz4 = {
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.cra_name = "lz4",
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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.cra_ctxsize = sizeof(struct lz4_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(alg_lz4.cra_list),
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.cra_init = lz4_init,
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.cra_exit = lz4_exit,
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.cra_u = { .compress = {
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.coa_compress = lz4_compress_crypto,
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.coa_decompress = lz4_decompress_crypto } }
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};
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static int __init lz4_mod_init(void)
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{
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return crypto_register_alg(&alg_lz4);
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}
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static void __exit lz4_mod_fini(void)
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{
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crypto_unregister_alg(&alg_lz4);
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}
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module_init(lz4_mod_init);
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module_exit(lz4_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("LZ4 Compression Algorithm");
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MODULE_ALIAS_CRYPTO("lz4");
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