| Nikolay Borisov | 67882e7 | 2019-05-30 09:52:57 +0300 | [diff] [blame] | 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 | |
| 12 | struct xxhash64_tfm_ctx { |
| 13 | u64 seed; |
| 14 | }; |
| 15 | |
| 16 | struct xxhash64_desc_ctx { |
| 17 | struct xxh64_state xxhstate; |
| 18 | }; |
| 19 | |
| 20 | static 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 | |
| 33 | static 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 | |
| 43 | static 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 | |
| 53 | static 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 | |
| 62 | static 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 | |
| 72 | static 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 | |
| 91 | static int __init xxhash_mod_init(void) |
| 92 | { |
| 93 | return crypto_register_shash(&alg); |
| 94 | } |
| 95 | |
| 96 | static void __exit xxhash_mod_fini(void) |
| 97 | { |
| 98 | crypto_unregister_shash(&alg); |
| 99 | } |
| 100 | |
| 101 | subsys_initcall(xxhash_mod_init); |
| 102 | module_exit(xxhash_mod_fini); |
| 103 | |
| 104 | MODULE_AUTHOR("Nikolay Borisov <nborisov@suse.com>"); |
| 105 | MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c"); |
| 106 | MODULE_LICENSE("GPL"); |
| 107 | MODULE_ALIAS_CRYPTO("xxhash64"); |
| 108 | MODULE_ALIAS_CRYPTO("xxhash64-generic"); |