linux/crypto/xxhash_generic.c
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   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <crypto/internal/hash.h>
   4#include <linux/init.h>
   5#include <linux/module.h>
   6#include <linux/xxhash.h>
   7#include <asm/unaligned.h>
   8
   9#define XXHASH64_BLOCK_SIZE     32
  10#define XXHASH64_DIGEST_SIZE    8
  11
  12struct xxhash64_tfm_ctx {
  13        u64 seed;
  14};
  15
  16struct xxhash64_desc_ctx {
  17        struct xxh64_state xxhstate;
  18};
  19
  20static int xxhash64_setkey(struct crypto_shash *tfm, const u8 *key,
  21                         unsigned int keylen)
  22{
  23        struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm);
  24
  25        if (keylen != sizeof(tctx->seed)) {
  26                crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
  27                return -EINVAL;
  28        }
  29        tctx->seed = get_unaligned_le64(key);
  30        return 0;
  31}
  32
  33static int xxhash64_init(struct shash_desc *desc)
  34{
  35        struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  36        struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  37
  38        xxh64_reset(&dctx->xxhstate, tctx->seed);
  39
  40        return 0;
  41}
  42
  43static int xxhash64_update(struct shash_desc *desc, const u8 *data,
  44                         unsigned int length)
  45{
  46        struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  47
  48        xxh64_update(&dctx->xxhstate, data, length);
  49
  50        return 0;
  51}
  52
  53static int xxhash64_final(struct shash_desc *desc, u8 *out)
  54{
  55        struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  56
  57        put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out);
  58
  59        return 0;
  60}
  61
  62static int xxhash64_digest(struct shash_desc *desc, const u8 *data,
  63                         unsigned int length, u8 *out)
  64{
  65        struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  66
  67        put_unaligned_le64(xxh64(data, length, tctx->seed), out);
  68
  69        return 0;
  70}
  71
  72static struct shash_alg alg = {
  73        .digestsize     = XXHASH64_DIGEST_SIZE,
  74        .setkey         = xxhash64_setkey,
  75        .init           = xxhash64_init,
  76        .update         = xxhash64_update,
  77        .final          = xxhash64_final,
  78        .digest         = xxhash64_digest,
  79        .descsize       = sizeof(struct xxhash64_desc_ctx),
  80        .base           = {
  81                .cra_name        = "xxhash64",
  82                .cra_driver_name = "xxhash64-generic",
  83                .cra_priority    = 100,
  84                .cra_flags       = CRYPTO_ALG_OPTIONAL_KEY,
  85                .cra_blocksize   = XXHASH64_BLOCK_SIZE,
  86                .cra_ctxsize     = sizeof(struct xxhash64_tfm_ctx),
  87                .cra_module      = THIS_MODULE,
  88        }
  89};
  90
  91static int __init xxhash_mod_init(void)
  92{
  93        return crypto_register_shash(&alg);
  94}
  95
  96static void __exit xxhash_mod_fini(void)
  97{
  98        crypto_unregister_shash(&alg);
  99}
 100
 101subsys_initcall(xxhash_mod_init);
 102module_exit(xxhash_mod_fini);
 103
 104MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>");
 105MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
 106MODULE_LICENSE("GPL");
 107MODULE_ALIAS_CRYPTO("xxhash64");
 108MODULE_ALIAS_CRYPTO("xxhash64-generic");
 109