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51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
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/*
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* Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <crypto/hash.h>
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#include <linux/err.h>
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#include "hash.h"
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static struct crypto_shash *tfm;
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int __init btrfs_hash_init(void)
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{
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tfm = crypto_alloc_shash("crc32c", 0, 0);
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if (IS_ERR(tfm))
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return PTR_ERR(tfm);
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return 0;
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}
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void btrfs_hash_exit(void)
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{
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crypto_free_shash(tfm);
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}
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u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
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{
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struct {
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struct shash_desc shash;
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char ctx[crypto_shash_descsize(tfm)];
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} desc;
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int err;
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desc.shash.tfm = tfm;
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desc.shash.flags = 0;
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*(u32 *)desc.ctx = crc;
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err = crypto_shash_update(&desc.shash, address, length);
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BUG_ON(err);
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return *(u32 *)desc.ctx;
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}
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