68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
/*
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Copyright (c) 2014 Anton Titov.
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Copyright (c) 2014 pCloud Ltd. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met: Redistributions of source code must retain the above
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copyright notice, this list of conditions and the following
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disclaimer. Redistributions in binary form must reproduce the
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above copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution. Neither the name of pCloud Ltd nor the
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names of its contributors may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL pCloud
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Ltd BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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*/
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#ifndef _PSYNC_CRC32_H
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#define _PSYNC_CRC32_H
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#include <stddef.h>
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#include <stdint.h>
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#define PSYNC_CRC_INITIAL 0
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#define PSYNC_FAST_HASH256_LEN 32
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#define PSYNC_FAST_HASH256_HEXLEN 64
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#define PSYNC_FAST_HASH256_BLOCK_LEN 64
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typedef struct {
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uint64_t state[6];
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uint64_t length;
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union {
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uint64_t buff64[PSYNC_FAST_HASH256_BLOCK_LEN / sizeof(uint64_t)];
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unsigned char buff[PSYNC_FAST_HASH256_BLOCK_LEN];
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};
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} psync_fast_hash256_ctx;
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uint32_t pcrc32c_compute(uint32_t crc, const void *ptr, size_t len);
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/* psync_fast_hash256 is supposed to be fast, non-cryptographic strength,
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* non-collision resistant hash function with large output. Think of it as CRC32
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* but faster, with 256bit output and for cases that you can't live with the
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* chances of CRC32 _random_ collision. It is intended for large inputs,
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* finalization is relatively expensive.
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*/
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void pcrc32c_fast_hash256_init(psync_fast_hash256_ctx *ctx);
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void pcrc32c_fast_hash256_seed(psync_fast_hash256_ctx *ctx, const void *seed, size_t seedlen);
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void pcrc32c_fast_hash256_update(psync_fast_hash256_ctx *ctx, const void *data, size_t len);
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void pcrc32c_fast_hash256_final(void *hash, psync_fast_hash256_ctx *ctx);
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#endif
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