xref: /openssl/include/crypto/siphash.h (revision 5db68273)
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
51