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83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/*-
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* Copyright (c) 2013 Andre Oppermann <andre@FreeBSD.org>
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* All rights reserved.
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*
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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:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* SipHash is a family of pseudorandom functions (a.k.a. keyed hash functions)
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* optimized for speed on short messages returning a 64bit hash/digest value.
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*
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* The number of rounds is defined during the initialization:
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* SipHash24_Init() for the fast and resonable strong version
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* SipHash48_Init() for the strong version (half as fast)
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*
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* struct SIPHASH_CTX ctx;
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* SipHash24_Init(&ctx);
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* SipHash_SetKey(&ctx, "16bytes long key");
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* SipHash_Update(&ctx, pointer_to_string, length_of_string);
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* SipHash_Final(output, &ctx);
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*/
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#ifndef _SIPHASH_H_
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#define _SIPHASH_H_
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#define SIPHASH_BLOCK_LENGTH 8
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#define SIPHASH_KEY_LENGTH 16
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#define SIPHASH_DIGEST_LENGTH 8
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typedef struct _SIPHASH_CTX {
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uint64_t v[4];
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union {
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uint64_t b64;
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uint8_t b8[8];
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} buf;
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uint64_t bytes;
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uint8_t buflen;
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uint8_t rounds_compr;
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uint8_t rounds_final;
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uint8_t initialized;
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} SIPHASH_CTX;
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#define SipHash24_Init(x) SipHash_InitX((x), 2, 4)
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#define SipHash48_Init(x) SipHash_InitX((x), 4, 8)
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void SipHash_InitX(SIPHASH_CTX *, int, int);
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void SipHash_SetKey(SIPHASH_CTX *,
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const uint8_t[__min_size(SIPHASH_KEY_LENGTH)]);
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void SipHash_Update(SIPHASH_CTX *, const void *, size_t);
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void SipHash_Final(uint8_t[__min_size(SIPHASH_DIGEST_LENGTH)], SIPHASH_CTX *);
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uint64_t SipHash_End(SIPHASH_CTX *);
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#define SipHash24(x, y, z, i) SipHashX((x), 2, 4, (y), (z), (i));
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#define SipHash48(x, y, z, i) SipHashX((x), 4, 8, (y), (z), (i));
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uint64_t SipHashX(SIPHASH_CTX *, int, int,
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const uint8_t[__min_size(SIPHASH_KEY_LENGTH)], const void *, size_t);
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int SipHash24_TestVectors(void);
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#endif /* _SIPHASH_H_ */
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