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106 lines
2.4 KiB
106 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <crypto/internal/hash.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/xxhash.h> |
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#include <asm/unaligned.h> |
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#define XXHASH64_BLOCK_SIZE 32 |
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#define XXHASH64_DIGEST_SIZE 8 |
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struct xxhash64_tfm_ctx { |
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u64 seed; |
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}; |
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struct xxhash64_desc_ctx { |
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struct xxh64_state xxhstate; |
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}; |
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static int xxhash64_setkey(struct crypto_shash *tfm, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(tfm); |
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if (keylen != sizeof(tctx->seed)) |
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return -EINVAL; |
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tctx->seed = get_unaligned_le64(key); |
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return 0; |
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} |
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static int xxhash64_init(struct shash_desc *desc) |
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{ |
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struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); |
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struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc); |
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xxh64_reset(&dctx->xxhstate, tctx->seed); |
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return 0; |
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} |
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static int xxhash64_update(struct shash_desc *desc, const u8 *data, |
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unsigned int length) |
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{ |
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struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc); |
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xxh64_update(&dctx->xxhstate, data, length); |
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return 0; |
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} |
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static int xxhash64_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct xxhash64_desc_ctx *dctx = shash_desc_ctx(desc); |
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put_unaligned_le64(xxh64_digest(&dctx->xxhstate), out); |
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return 0; |
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} |
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static int xxhash64_digest(struct shash_desc *desc, const u8 *data, |
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unsigned int length, u8 *out) |
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{ |
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struct xxhash64_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); |
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put_unaligned_le64(xxh64(data, length, tctx->seed), out); |
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return 0; |
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} |
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static struct shash_alg alg = { |
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.digestsize = XXHASH64_DIGEST_SIZE, |
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.setkey = xxhash64_setkey, |
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.init = xxhash64_init, |
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.update = xxhash64_update, |
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.final = xxhash64_final, |
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.digest = xxhash64_digest, |
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.descsize = sizeof(struct xxhash64_desc_ctx), |
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.base = { |
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.cra_name = "xxhash64", |
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.cra_driver_name = "xxhash64-generic", |
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.cra_priority = 100, |
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
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.cra_blocksize = XXHASH64_BLOCK_SIZE, |
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.cra_ctxsize = sizeof(struct xxhash64_tfm_ctx), |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static int __init xxhash_mod_init(void) |
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{ |
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return crypto_register_shash(&alg); |
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} |
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static void __exit xxhash_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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subsys_initcall(xxhash_mod_init); |
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module_exit(xxhash_mod_fini); |
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MODULE_AUTHOR("Nikolay Borisov <[email protected]>"); |
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MODULE_DESCRIPTION("xxhash calculations wrapper for lib/xxhash.c"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_CRYPTO("xxhash64"); |
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MODULE_ALIAS_CRYPTO("xxhash64-generic");
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