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1 /*
2 * Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #ifndef OSSL_CRYPTO_SIPHASH_H
11 # define OSSL_CRYPTO_SIPHASH_H
12 # pragma once
13
14 # include <stddef.h>
15
16 # define SIPHASH_BLOCK_SIZE 8
17 # define SIPHASH_KEY_SIZE 16
18 # define SIPHASH_MIN_DIGEST_SIZE 8
19 # define SIPHASH_MAX_DIGEST_SIZE 16
20
21 typedef struct siphash_st SIPHASH;
22
23 size_t SipHash_ctx_size(void);
24 size_t SipHash_hash_size(SIPHASH *ctx);
25 int SipHash_set_hash_size(SIPHASH *ctx, size_t hash_size);
26 int SipHash_Init(SIPHASH *ctx, const unsigned char *k,
27 int crounds, int drounds);
28 void SipHash_Update(SIPHASH *ctx, const unsigned char *in, size_t inlen);
29 int SipHash_Final(SIPHASH *ctx, unsigned char *out, size_t outlen);
30
31 /* Based on https://131002.net/siphash C reference implementation */
32
33 struct siphash_st {
34 uint64_t total_inlen;
35 uint64_t v0;
36 uint64_t v1;
37 uint64_t v2;
38 uint64_t v3;
39 unsigned int len;
40 unsigned int hash_size;
41 unsigned int crounds;
42 unsigned int drounds;
43 unsigned char leavings[SIPHASH_BLOCK_SIZE];
44 };
45
46 /* default: SipHash-2-4 */
47 # define SIPHASH_C_ROUNDS 2
48 # define SIPHASH_D_ROUNDS 4
49
50 #endif