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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ SipHash reference C implementation
+ Copyright (c) 2012-2014 Jean-Philippe Aumasson
+ <jeanphilippe.aumasson@gmail.com>
+ Copyright (c) 2012-2014 Daniel J. Bernstein <djb@cr.yp.to>
+ To the extent possible under law, the author(s) have dedicated all copyright
+ and related and neighboring rights to this software to the public domain
+ worldwide. This software is distributed without any warranty.
+ You should have received a copy of the CC0 Public Domain Dedication along
+ with this software. If not, see
+ <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#ifndef APR_SIPHASH_H
+#define APR_SIPHASH_H
+
+#include "apr.h"
+#include "apu.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @file apr_siphash.h
+ * @brief APR-UTIL siphash library
+ * "SipHash-c-d is a family of pseudorandom functions (a.k.a. keyed
+ * hash functions) optimized for speed on short messages", designed by
+ * Jean-Philippe Aumasson and Daniel J. Bernstein. It generates a 64bit
+ * hash (or MAC) from the message and a 128bit key.
+ * See http://cr.yp.to/siphash/siphash-20120620.pdf for the details,
+ * c is the number of compression rounds, d the number of finalization
+ * rounds; we also define fast implementations for c = 2 with d = 4 (aka
+ * siphash-2-4), and c = 4 with d = 8 (aka siphash-4-8), as recommended
+ * parameters per the authors.
+ */
+
+/** size of the siphash digest */
+#define APR_SIPHASH_DSIZE 8
+
+/** size of the siphash key */
+#define APR_SIPHASH_KSIZE 16
+
+
+/**
+ * @brief Computes SipHash-c-d, producing a 64bit (APR_SIPHASH_DSIZE) hash
+ * from a message and a 128bit (APR_SIPHASH_KSIZE) secret key.
+ * @param src The message
+ * @param len The length of the message
+ * @param key The secret key
+ * @param c The number of compression rounds
+ * @param d The number of finalization rounds
+ * @return The hash value as a 64bit unsigned integer
+ */
+APU_DECLARE(apr_uint64_t) apr_siphash(const void *src, apr_size_t len,
+ const unsigned char key[APR_SIPHASH_KSIZE],
+ unsigned int c, unsigned int d);
+
+/**
+ * @brief Computes SipHash-c-d, producing a 64bit (APR_SIPHASH_DSIZE) hash
+ * from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly
+ * unaligned buffer (using the little endian representation as defined by the
+ * authors for interoperabilty) usable as a MAC.
+ * @param out The output buffer (or MAC)
+ * @param src The message
+ * @param len The length of the message
+ * @param key The secret key
+ * @param c The number of compression rounds
+ * @param d The number of finalization rounds
+ * @return The hash value as a 64bit unsigned integer
+ */
+APU_DECLARE(void) apr_siphash_auth(unsigned char out[APR_SIPHASH_DSIZE],
+ const void *src, apr_size_t len,
+ const unsigned char key[APR_SIPHASH_KSIZE],
+ unsigned int c, unsigned int d);
+
+/**
+ * @brief Computes SipHash-2-4, producing a 64bit (APR_SIPHASH_DSIZE) hash
+ * from a message and a 128bit (APR_SIPHASH_KSIZE) secret key.
+ * @param src The message to hash
+ * @param len The length of the message
+ * @param key The secret key
+ * @return The hash value as a 64bit unsigned integer
+ */
+APU_DECLARE(apr_uint64_t) apr_siphash24(const void *src, apr_size_t len,
+ const unsigned char key[APR_SIPHASH_KSIZE]);
+
+/**
+ * @brief Computes SipHash-2-4, producing a 64bit (APR_SIPHASH_DSIZE) hash
+ * from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly
+ * unaligned buffer (using the little endian representation as defined by the
+ * authors for interoperabilty) usable as a MAC.
+ * @param out The output buffer (or MAC)
+ * @param src The message
+ * @param len The length of the message
+ * @param key The secret key
+ * @return The hash value as a 64bit unsigned integer
+ */
+APU_DECLARE(void) apr_siphash24_auth(unsigned char out[APR_SIPHASH_DSIZE],
+ const void *src, apr_size_t len,
+ const unsigned char key[APR_SIPHASH_KSIZE]);
+
+/**
+ * @brief Computes SipHash-4-8, producing a 64bit (APR_SIPHASH_DSIZE) hash
+ * from a message and a 128bit (APR_SIPHASH_KSIZE) secret key.
+ * @param src The message
+ * @param len The length of the message
+ * @param key The secret key
+ * @return The hash value as a 64bit unsigned integer
+ */
+APU_DECLARE(apr_uint64_t) apr_siphash48(const void *src, apr_size_t len,
+ const unsigned char key[APR_SIPHASH_KSIZE]);
+
+/**
+ * @brief Computes SipHash-4-8, producing a 64bit (APR_SIPHASH_DSIZE) hash
+ * from a message and a 128bit (APR_SIPHASH_KSIZE) secret key, into a possibly
+ * unaligned buffer (using the little endian representation as defined by the
+ * authors for interoperabilty) usable as a MAC.
+ * @param out The output buffer (or MAC)
+ * @param src The message
+ * @param len The length of the message
+ * @param key The secret key
+ * @return The hash value as a 64bit unsigned integer
+ */
+APU_DECLARE(void) apr_siphash48_auth(unsigned char out[APR_SIPHASH_DSIZE],
+ const void *src, apr_size_t len,
+ const unsigned char key[APR_SIPHASH_KSIZE]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* APR_SIPHASH_H */