102 lines
3 KiB
C
102 lines
3 KiB
C
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/* siphash.h
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*
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* Copyright (C) 2006-2023 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#ifndef WOLF_CRYPT_SIPHASH_H
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#define WOLF_CRYPT_SIPHASH_H
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#include <wolfssl/wolfcrypt/types.h>
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#if defined(WOLFSSL_SIPHASH)
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/* DESCRIPTION
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*
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* SipHash is a PseudoRandom Function (PRF) that can be used with small
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* messages (less than 256 bytes).
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* SipHash can be used for Message Authentication Codes (MACs) and as such must
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* be passed a secret key.
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* https://eprint.iacr.org/2012/351.pdf
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*
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* SipHash is commonly used in hash tables.
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* Do not use this as a hash not as a general purpose MAC.
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*
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* WOLFSSL_SIPHASH_CROUNDS and WOLFSSL_SIPHASH_DROUNDS can be defined at build
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* time to change the algorithm.
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* Default is SipHash-2-4:
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* WOLFSSL_SIPHASH_CROUNDS = 2
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* WOLFSSL_SIPHASH_DROUNDS = 4
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*/
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#ifndef WOLFSSL_SIPHASH_CROUNDS
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/* Number of rounds to perform in compression operation. */
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#define WOLFSSL_SIPHASH_CROUNDS 2
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#endif /* WOLFSSL_SIPHASH_CROUNDS */
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#ifndef WOLFSSL_SIPHASH_DROUNDS
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/* Number of rounds to perform in final operation. */
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#define WOLFSSL_SIPHASH_DROUNDS 4
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#endif /* WOLFSSL_SIPHASH_DROUNDS */
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enum {
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SIPHASH_KEY_SIZE = 16, /* Key size of SipHash. */
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SIPHASH_BLOCK_SIZE = 8, /* Block size of SipHash. */
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SIPHASH_MAC_SIZE_8 = 8, /* Output an 8 byte MAC. */
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SIPHASH_MAC_SIZE_16 = 16 /* Output a 16 byte MAC. */
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};
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typedef struct SipHash SipHash;
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struct SipHash {
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/* Internal state. */
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word64 v[4];
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/* Cached message data. */
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byte cache[SIPHASH_BLOCK_SIZE];
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/* Number of bytes cached. */
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byte cacheCnt;
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/* Number of output bytes. */
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byte outSz;
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/* Number of input bytes processed. */
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word32 inCnt;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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WOLFSSL_API int wc_InitSipHash(SipHash* sipHash, const unsigned char* key,
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unsigned char outSz);
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WOLFSSL_API int wc_SipHashUpdate(SipHash* sipHash, const unsigned char* in,
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word32 inSz);
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WOLFSSL_API int wc_SipHashFinal(SipHash* sipHash, unsigned char* out,
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unsigned char outSz);
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WOLFSSL_API int wc_SipHash(const unsigned char* key, const unsigned char* in,
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word32 inSz, unsigned char* out, unsigned char outSz);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* NO_AES && WOLFSSL_SIPHASH */
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#endif /* WOLF_CRYPT_SIPHASH_H */
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