1253208Sandre/*- 2253208Sandre * Copyright (c) 2013 Andre Oppermann <andre@FreeBSD.org> 3253208Sandre * All rights reserved. 4253208Sandre * 5253208Sandre * Redistribution and use in source and binary forms, with or without 6253208Sandre * modification, are permitted provided that the following conditions 7253208Sandre * are met: 8253208Sandre * 1. Redistributions of source code must retain the above copyright 9253208Sandre * notice, this list of conditions and the following disclaimer. 10253208Sandre * 2. Redistributions in binary form must reproduce the above copyright 11253208Sandre * notice, this list of conditions and the following disclaimer in the 12253208Sandre * documentation and/or other materials provided with the distribution. 13253208Sandre * 3. The name of the author may not be used to endorse or promote 14253208Sandre * products derived from this software without specific prior written 15253208Sandre * permission. 16253208Sandre * 17253208Sandre * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18253208Sandre * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19253208Sandre * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20253208Sandre * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21253208Sandre * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22253208Sandre * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23253208Sandre * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24253208Sandre * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25253208Sandre * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26253208Sandre * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27253208Sandre * SUCH DAMAGE. 28253208Sandre * 29253208Sandre * $FreeBSD: releng/10.2/sys/crypto/siphash/siphash.h 253208 2013-07-11 14:18:38Z andre $ 30253208Sandre */ 31253208Sandre 32253208Sandre/* 33253208Sandre * SipHash is a family of pseudorandom functions (a.k.a. keyed hash functions) 34253208Sandre * optimized for speed on short messages returning a 64bit hash/digest value. 35253208Sandre * 36253208Sandre * The number of rounds is defined during the initialization: 37253208Sandre * SipHash24_Init() for the fast and resonable strong version 38253208Sandre * SipHash48_Init() for the strong version (half as fast) 39253208Sandre * 40253208Sandre * struct SIPHASH_CTX ctx; 41253208Sandre * SipHash24_Init(&ctx); 42253208Sandre * SipHash_SetKey(&ctx, "16bytes long key"); 43253208Sandre * SipHash_Update(&ctx, pointer_to_string, length_of_string); 44253208Sandre * SipHash_Final(output, &ctx); 45253208Sandre */ 46253208Sandre 47253208Sandre#ifndef _SIPHASH_H_ 48253208Sandre#define _SIPHASH_H_ 49253208Sandre 50253208Sandre#define SIPHASH_BLOCK_LENGTH 8 51253208Sandre#define SIPHASH_KEY_LENGTH 16 52253208Sandre#define SIPHASH_DIGEST_LENGTH 8 53253208Sandre 54253208Sandretypedef struct _SIPHASH_CTX { 55253208Sandre uint64_t v[4]; 56253208Sandre union { 57253208Sandre uint64_t b64; 58253208Sandre uint8_t b8[8]; 59253208Sandre } buf; 60253208Sandre uint64_t bytes; 61253208Sandre uint8_t buflen; 62253208Sandre uint8_t rounds_compr; 63253208Sandre uint8_t rounds_final; 64253208Sandre uint8_t initialized; 65253208Sandre} SIPHASH_CTX; 66253208Sandre 67253208Sandre 68253208Sandre#define SipHash24_Init(x) SipHash_InitX((x), 2, 4) 69253208Sandre#define SipHash48_Init(x) SipHash_InitX((x), 4, 8) 70253208Sandrevoid SipHash_InitX(SIPHASH_CTX *, int, int); 71253208Sandrevoid SipHash_SetKey(SIPHASH_CTX *, const uint8_t [16]); 72253208Sandrevoid SipHash_Update(SIPHASH_CTX *, const void *, size_t); 73253208Sandrevoid SipHash_Final(void *, SIPHASH_CTX *); 74253208Sandreuint64_t SipHash_End(SIPHASH_CTX *); 75253208Sandre 76253208Sandre#define SipHash24(x, y, z, i) SipHashX((x), 2, 4, (y), (z), (i)); 77253208Sandre#define SipHash48(x, y, z, i) SipHashX((x), 4, 8, (y), (z), (i)); 78253208Sandreuint64_t SipHashX(SIPHASH_CTX *, int, int, const uint8_t [16], const void *, 79253208Sandre size_t); 80253208Sandre 81253208Sandreint SipHash24_TestVectors(void); 82253208Sandre 83253208Sandre#endif /* _SIPHASH_H_ */ 84