linux/crypto/xxhash_generic.c
<<
>>
Prefs
   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                return -EINVAL;
  27        tctx->seed = get_unaligned_le64(key);
  28        return 0;
  29}
  30
  31static int xxhash64_init(struct shash_desc *desc)
  32{
  33        struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  34        struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  35
  36        xxh64_reset(&dctx->xxhstate, tctx->seed);
  37
  38        return 0;
  39}
  40
  41static int xxhash64_update(struct shash_desc *desc, const u8 *data,
  42                         unsigned int length)
  43{
  44        struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  45
  46        xxh64_update(&dctx->xxhstate, data, length);
  47
  48        return 0;
  49}
  50
  51static int xxhash64_final(struct shash_desc *desc, u8 *out)
  52{
  53        struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc);
  54
  55        put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out);
  56
  57        return 0;
  58}
  59
  60static int xxhash64_digest(struct shash_desc *desc, const u8 *data,
  61                         unsigned int length, u8 *out)
  62{
  63        struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  64
  65        put_unaligned_le64(xxh64(data, length, tctx->seed), out);
  66
  67        return 0;
  68}
  69
  70static struct shash_alg alg = {
  71        .digestsize     = XXHASH64_DIGEST_SIZE,
  72        .setkey         = xxhash64_setkey,
  73        .init           = xxhash64_init,
  74        .update         = xxhash64_update,
  75        .final          = xxhash64_final,
  76        .digest         = xxhash64_digest,
  77        .descsize       = sizeof(struct xxhash64_desc_ctx),
  78        .base           = {
  79                .cra_name        = "xxhash64",
  80                .cra_driver_name = "xxhash64-generic",
  81                .cra_priority    = 100,
  82                .cra_flags       = CRYPTO_ALG_OPTIONAL_KEY,
  83                .cra_blocksize   = XXHASH64_BLOCK_SIZE,
  84                .cra_ctxsize     = sizeof(struct xxhash64_tfm_ctx),
  85                .cra_module      = THIS_MODULE,
  86        }
  87};
  88
  89static int __init xxhash_mod_init(void)
  90{
  91        return crypto_register_shash(&alg);
  92}
  93
  94static void __exit xxhash_mod_fini(void)
  95{
  96        crypto_unregister_shash(&alg);
  97}
  98
  99subsys_initcall(xxhash_mod_init);
 100module_exit(xxhash_mod_fini);
 101
 102MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>");
 103MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c");
 104MODULE_LICENSE("GPL");
 105MODULE_ALIAS_CRYPTO("xxhash64");
 106MODULE_ALIAS_CRYPTO("xxhash64-generic");
 107
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.