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Merge pull request hardkernel#16 from hyphop/khadas-vims-4.9.y
Khadas vims 4.9.y
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,265 @@ | ||
| /* | ||
| * Cryptographic API. | ||
| * | ||
| * Copyright (c) 2017-present, Facebook, Inc. | ||
| * | ||
| * 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. | ||
| */ | ||
| #include <linux/crypto.h> | ||
| #include <linux/init.h> | ||
| #include <linux/interrupt.h> | ||
| #include <linux/mm.h> | ||
| #include <linux/module.h> | ||
| #include <linux/net.h> | ||
| #include <linux/vmalloc.h> | ||
| #include <linux/zstd.h> | ||
| #include <crypto/internal/scompress.h> | ||
|
|
||
|
|
||
| #define ZSTD_DEF_LEVEL 3 | ||
|
|
||
| struct zstd_ctx { | ||
| ZSTD_CCtx *cctx; | ||
| ZSTD_DCtx *dctx; | ||
| void *cwksp; | ||
| void *dwksp; | ||
| }; | ||
|
|
||
| static ZSTD_parameters zstd_params(void) | ||
| { | ||
| return ZSTD_getParams(ZSTD_DEF_LEVEL, 0, 0); | ||
| } | ||
|
|
||
| static int zstd_comp_init(struct zstd_ctx *ctx) | ||
| { | ||
| int ret = 0; | ||
| const ZSTD_parameters params = zstd_params(); | ||
| const size_t wksp_size = ZSTD_CCtxWorkspaceBound(params.cParams); | ||
|
|
||
| ctx->cwksp = vzalloc(wksp_size); | ||
| if (!ctx->cwksp) { | ||
| ret = -ENOMEM; | ||
| goto out; | ||
| } | ||
|
|
||
| ctx->cctx = ZSTD_initCCtx(ctx->cwksp, wksp_size); | ||
| if (!ctx->cctx) { | ||
| ret = -EINVAL; | ||
| goto out_free; | ||
| } | ||
| out: | ||
| return ret; | ||
| out_free: | ||
| vfree(ctx->cwksp); | ||
| goto out; | ||
| } | ||
|
|
||
| static int zstd_decomp_init(struct zstd_ctx *ctx) | ||
| { | ||
| int ret = 0; | ||
| const size_t wksp_size = ZSTD_DCtxWorkspaceBound(); | ||
|
|
||
| ctx->dwksp = vzalloc(wksp_size); | ||
| if (!ctx->dwksp) { | ||
| ret = -ENOMEM; | ||
| goto out; | ||
| } | ||
|
|
||
| ctx->dctx = ZSTD_initDCtx(ctx->dwksp, wksp_size); | ||
| if (!ctx->dctx) { | ||
| ret = -EINVAL; | ||
| goto out_free; | ||
| } | ||
| out: | ||
| return ret; | ||
| out_free: | ||
| vfree(ctx->dwksp); | ||
| goto out; | ||
| } | ||
|
|
||
| static void zstd_comp_exit(struct zstd_ctx *ctx) | ||
| { | ||
| vfree(ctx->cwksp); | ||
| ctx->cwksp = NULL; | ||
| ctx->cctx = NULL; | ||
| } | ||
|
|
||
| static void zstd_decomp_exit(struct zstd_ctx *ctx) | ||
| { | ||
| vfree(ctx->dwksp); | ||
| ctx->dwksp = NULL; | ||
| ctx->dctx = NULL; | ||
| } | ||
|
|
||
| static int __zstd_init(void *ctx) | ||
| { | ||
| int ret; | ||
|
|
||
| ret = zstd_comp_init(ctx); | ||
| if (ret) | ||
| return ret; | ||
| ret = zstd_decomp_init(ctx); | ||
| if (ret) | ||
| zstd_comp_exit(ctx); | ||
| return ret; | ||
| } | ||
|
|
||
| static void *zstd_alloc_ctx(struct crypto_scomp *tfm) | ||
| { | ||
| int ret; | ||
| struct zstd_ctx *ctx; | ||
|
|
||
| ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | ||
| if (!ctx) | ||
| return ERR_PTR(-ENOMEM); | ||
|
|
||
| ret = __zstd_init(ctx); | ||
| if (ret) { | ||
| kfree(ctx); | ||
| return ERR_PTR(ret); | ||
| } | ||
|
|
||
| return ctx; | ||
| } | ||
|
|
||
| static int zstd_init(struct crypto_tfm *tfm) | ||
| { | ||
| struct zstd_ctx *ctx = crypto_tfm_ctx(tfm); | ||
|
|
||
| return __zstd_init(ctx); | ||
| } | ||
|
|
||
| static void __zstd_exit(void *ctx) | ||
| { | ||
| zstd_comp_exit(ctx); | ||
| zstd_decomp_exit(ctx); | ||
| } | ||
|
|
||
| static void zstd_free_ctx(struct crypto_scomp *tfm, void *ctx) | ||
| { | ||
| __zstd_exit(ctx); | ||
| kzfree(ctx); | ||
| } | ||
|
|
||
| static void zstd_exit(struct crypto_tfm *tfm) | ||
| { | ||
| struct zstd_ctx *ctx = crypto_tfm_ctx(tfm); | ||
|
|
||
| __zstd_exit(ctx); | ||
| } | ||
|
|
||
| static int __zstd_compress(const u8 *src, unsigned int slen, | ||
| u8 *dst, unsigned int *dlen, void *ctx) | ||
| { | ||
| size_t out_len; | ||
| struct zstd_ctx *zctx = ctx; | ||
| const ZSTD_parameters params = zstd_params(); | ||
|
|
||
| out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, params); | ||
| if (ZSTD_isError(out_len)) | ||
| return -EINVAL; | ||
| *dlen = out_len; | ||
| return 0; | ||
| } | ||
|
|
||
| static int zstd_compress(struct crypto_tfm *tfm, const u8 *src, | ||
| unsigned int slen, u8 *dst, unsigned int *dlen) | ||
| { | ||
| struct zstd_ctx *ctx = crypto_tfm_ctx(tfm); | ||
|
|
||
| return __zstd_compress(src, slen, dst, dlen, ctx); | ||
| } | ||
|
|
||
| static int zstd_scompress(struct crypto_scomp *tfm, const u8 *src, | ||
| unsigned int slen, u8 *dst, unsigned int *dlen, | ||
| void *ctx) | ||
| { | ||
| return __zstd_compress(src, slen, dst, dlen, ctx); | ||
| } | ||
|
|
||
| static int __zstd_decompress(const u8 *src, unsigned int slen, | ||
| u8 *dst, unsigned int *dlen, void *ctx) | ||
| { | ||
| size_t out_len; | ||
| struct zstd_ctx *zctx = ctx; | ||
|
|
||
| out_len = ZSTD_decompressDCtx(zctx->dctx, dst, *dlen, src, slen); | ||
| if (ZSTD_isError(out_len)) | ||
| return -EINVAL; | ||
| *dlen = out_len; | ||
| return 0; | ||
| } | ||
|
|
||
| static int zstd_decompress(struct crypto_tfm *tfm, const u8 *src, | ||
| unsigned int slen, u8 *dst, unsigned int *dlen) | ||
| { | ||
| struct zstd_ctx *ctx = crypto_tfm_ctx(tfm); | ||
|
|
||
| return __zstd_decompress(src, slen, dst, dlen, ctx); | ||
| } | ||
|
|
||
| static int zstd_sdecompress(struct crypto_scomp *tfm, const u8 *src, | ||
| unsigned int slen, u8 *dst, unsigned int *dlen, | ||
| void *ctx) | ||
| { | ||
| return __zstd_decompress(src, slen, dst, dlen, ctx); | ||
| } | ||
|
|
||
| static struct crypto_alg alg = { | ||
| .cra_name = "zstd", | ||
| .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, | ||
| .cra_ctxsize = sizeof(struct zstd_ctx), | ||
| .cra_module = THIS_MODULE, | ||
| .cra_init = zstd_init, | ||
| .cra_exit = zstd_exit, | ||
| .cra_u = { .compress = { | ||
| .coa_compress = zstd_compress, | ||
| .coa_decompress = zstd_decompress } } | ||
| }; | ||
|
|
||
| static struct scomp_alg scomp = { | ||
| .alloc_ctx = zstd_alloc_ctx, | ||
| .free_ctx = zstd_free_ctx, | ||
| .compress = zstd_scompress, | ||
| .decompress = zstd_sdecompress, | ||
| .base = { | ||
| .cra_name = "zstd", | ||
| .cra_driver_name = "zstd-scomp", | ||
| .cra_module = THIS_MODULE, | ||
| } | ||
| }; | ||
|
|
||
| static int __init zstd_mod_init(void) | ||
| { | ||
| int ret; | ||
|
|
||
| ret = crypto_register_alg(&alg); | ||
| if (ret) | ||
| return ret; | ||
|
|
||
| ret = crypto_register_scomp(&scomp); | ||
| if (ret) | ||
| crypto_unregister_alg(&alg); | ||
|
|
||
| return ret; | ||
| } | ||
|
|
||
| static void __exit zstd_mod_fini(void) | ||
| { | ||
| crypto_unregister_alg(&alg); | ||
| crypto_unregister_scomp(&scomp); | ||
| } | ||
|
|
||
| module_init(zstd_mod_init); | ||
| module_exit(zstd_mod_fini); | ||
|
|
||
| MODULE_LICENSE("GPL"); | ||
| MODULE_DESCRIPTION("Zstd Compression Algorithm"); | ||
| MODULE_ALIAS_CRYPTO("zstd"); |
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