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