diff options
Diffstat (limited to '')
| -rw-r--r-- | crypto/zstd.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/crypto/zstd.c b/crypto/zstd.c new file mode 100644 index 000000000..154a969c8 --- /dev/null +++ b/crypto/zstd.c @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Cryptographic API. + * + * Copyright (c) 2017-present, Facebook, Inc. + */ +#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_get_params(ZSTD_DEF_LEVEL, 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_cctx_workspace_bound(¶ms.cParams); + + ctx->cwksp = vzalloc(wksp_size); + if (!ctx->cwksp) { + ret = -ENOMEM; + goto out; + } + + ctx->cctx = zstd_init_cctx(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_dctx_workspace_bound(); + + ctx->dwksp = vzalloc(wksp_size); + if (!ctx->dwksp) { + ret = -ENOMEM; + goto out; + } + + ctx->dctx = zstd_init_dctx(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); + kfree_sensitive(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_compress_cctx(zctx->cctx, dst, *dlen, src, slen, ¶ms); + if (zstd_is_error(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_decompress_dctx(zctx->dctx, dst, *dlen, src, slen); + if (zstd_is_error(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_driver_name = "zstd-generic", + .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); +} + +subsys_initcall(zstd_mod_init); +module_exit(zstd_mod_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Zstd Compression Algorithm"); +MODULE_ALIAS_CRYPTO("zstd"); |