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Revision eed2ef4403de3d8937ccb624e15d3c5004e7dda5 authored by Linus Torvalds on 01 October 2020, 18:49:01 UTC, committed by Linus Torvalds on 01 October 2020, 18:49:01 UTC 
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
 
Pull arm64 fix from Catalin Marinas:
 "A previous commit to prevent AML memory opregions from accessing the
  kernel memory turned out to be too restrictive. Relax the permission
  check to permit the ACPI core to map kernel memory used for table
  overrides"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: permit ACPI core to map kernel memory used for table overrides
2 parent s fcadab7 + a509a66
Raw File
xxhash_generic.c 
// SPDX-License-Identifier: GPL-2.0

#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/xxhash.h>
#include <asm/unaligned.h>

#define XXHASH64_BLOCK_SIZE	32
#define XXHASH64_DIGEST_SIZE	8

struct xxhash64_tfm_ctx {
	u64 seed;
};

struct xxhash64_desc_ctx {
	struct xxh64_state xxhstate;
};

static int xxhash64_setkey(struct crypto_shash *tfm, const u8 *key,
			 unsigned int keylen)
{
	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm);

	if (keylen != sizeof(tctx->seed))
		return -EINVAL;
	tctx->seed = get_unaligned_le64(key);
	return 0;
}

static int xxhash64_init(struct shash_desc *desc)
{
	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);

	xxh64_reset(&dctx->xxhstate, tctx->seed);

	return 0;
}

static int xxhash64_update(struct shash_desc *desc, const u8 *data,
			 unsigned int length)
{
	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);

	xxh64_update(&dctx->xxhstate, data, length);

	return 0;
}

static int xxhash64_final(struct shash_desc *desc, u8 *out)
{
	struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);

	put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out);

	return 0;
}

static int xxhash64_digest(struct shash_desc *desc, const u8 *data,
			 unsigned int length, u8 *out)
{
	struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);

	put_unaligned_le64(xxh64(data, length, tctx->seed), out);

	return 0;
}

static struct shash_alg alg = {
	.digestsize	= XXHASH64_DIGEST_SIZE,
	.setkey		= xxhash64_setkey,
	.init		= xxhash64_init,
	.update		= xxhash64_update,
	.final		= xxhash64_final,
	.digest		= xxhash64_digest,
	.descsize	= sizeof(struct xxhash64_desc_ctx),
	.base		= {
		.cra_name	 = "xxhash64",
		.cra_driver_name = "xxhash64-generic",
		.cra_priority	 = 100,
		.cra_flags	 = CRYPTO_ALG_OPTIONAL_KEY,
		.cra_blocksize	 = XXHASH64_BLOCK_SIZE,
		.cra_ctxsize	 = sizeof(struct xxhash64_tfm_ctx),
		.cra_module	 = THIS_MODULE,
	}
};

static int __init xxhash_mod_init(void)
{
	return crypto_register_shash(&alg);
}

static void __exit xxhash_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

subsys_initcall(xxhash_mod_init);
module_exit(xxhash_mod_fini);

MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>");
MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("xxhash64");
MODULE_ALIAS_CRYPTO("xxhash64-generic");
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