2b27bdcc20
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 lz4_ctx {
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void *lz4_comp_mem;
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};
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static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
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{
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void *ctx;
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ctx = vmalloc(LZ4_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 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 = lz4_alloc_ctx(NULL);
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if (IS_ERR(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_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 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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lz4_free_ctx(NULL, ctx->lz4_comp_mem);
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}
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static int __lz4_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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int out_len = LZ4_compress_default(src, dst,
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slen, *dlen, ctx);
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if (!out_len)
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return -EINVAL;
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*dlen = out_len;
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return 0;
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}
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static int lz4_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 __lz4_compress_crypto(src, slen, dst, dlen, ctx);
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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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return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
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}
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static int __lz4_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 out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
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if (out_len < 0)
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return -EINVAL;
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*dlen = out_len;
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return 0;
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}
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static int lz4_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 __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
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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,
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unsigned int *dlen)
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{
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return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
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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_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 struct scomp_alg scomp = {
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.alloc_ctx = lz4_alloc_ctx,
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.free_ctx = lz4_free_ctx,
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.compress = lz4_scompress,
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.decompress = lz4_sdecompress,
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.base = {
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.cra_name = "lz4",
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.cra_driver_name = "lz4-scomp",
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.cra_module = THIS_MODULE,
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}
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};
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static int __init lz4_mod_init(void)
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{
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int ret;
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ret = crypto_register_alg(&alg_lz4);
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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_lz4);
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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 lz4_mod_fini(void)
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{
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crypto_unregister_alg(&alg_lz4);
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crypto_unregister_scomp(&scomp);
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}
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subsys_initcall(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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