xxhash_generic.c
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// 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");