161 lines
3.3 KiB
C
161 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_driver_name = "lz4-generic",
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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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