|  | /* Copyright (c) 2019, Google Inc. | 
|  | * | 
|  | * Permission to use, copy, modify, and/or distribute this software for any | 
|  | * purpose with or without fee is hereby granted, provided that the above | 
|  | * copyright notice and this permission notice appear in all copies. | 
|  | * | 
|  | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | 
|  | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | 
|  | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY | 
|  | * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | 
|  | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION | 
|  | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN | 
|  | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ | 
|  |  | 
|  | #ifndef OPENSSL_HEADER_SIPHASH_H | 
|  | #define OPENSSL_HEADER_SIPHASH_H | 
|  |  | 
|  | #include <openssl/base.h> | 
|  |  | 
|  | #if defined(__cplusplus) | 
|  | extern "C" { | 
|  | #endif | 
|  |  | 
|  |  | 
|  | // SipHash is a fast, secure PRF that is often used for hash tables. | 
|  |  | 
|  |  | 
|  | // SIPHASH_24 implements SipHash-2-4. See https://131002.net/siphash/siphash.pdf | 
|  | OPENSSL_EXPORT uint64_t SIPHASH_24(const uint64_t key[2], const uint8_t *input, | 
|  | size_t input_len); | 
|  |  | 
|  |  | 
|  | #if defined(__cplusplus) | 
|  | }  // extern C | 
|  | #endif | 
|  |  | 
|  | #endif  // OPENSSL_HEADER_SIPHASH_H |