/* * Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #ifndef OSSL_CRYPTO_SIPHASH_H # define OSSL_CRYPTO_SIPHASH_H # pragma once # include <stddef.h> # define SIPHASH_BLOCK_SIZE 8 # define SIPHASH_KEY_SIZE 16 # define SIPHASH_MIN_DIGEST_SIZE 8 # define SIPHASH_MAX_DIGEST_SIZE 16 typedef struct siphash_st SIPHASH; size_t SipHash_ctx_size(void); size_t SipHash_hash_size(SIPHASH *ctx); int SipHash_set_hash_size(SIPHASH *ctx, size_t hash_size); int SipHash_Init(SIPHASH *ctx, const unsigned char *k, int crounds, int drounds); void SipHash_Update(SIPHASH *ctx, const unsigned char *in, size_t inlen); int SipHash_Final(SIPHASH *ctx, unsigned char *out, size_t outlen); /* Based on https://131002.net/siphash C reference implementation */ struct siphash_st { uint64_t total_inlen; uint64_t v0; uint64_t v1; uint64_t v2; uint64_t v3; unsigned int len; unsigned int hash_size; unsigned int crounds; unsigned int drounds; unsigned char leavings[SIPHASH_BLOCK_SIZE]; }; /* default: SipHash-2-4 */ # define SIPHASH_C_ROUNDS 2 # define SIPHASH_D_ROUNDS 4 #endif